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Publications & Presentations

2022

Poster/Oral presentation

Date Mar. 2022
Author S. Iino (JAMSS), H. Nomoto (JAMSS), M. Sasaki (JANUS), S. Ishizawa (JANUS), T. Fukui (JANUS), Y. Ishitsuka (JANUS), Y. Michiura (JAMSS), T. Hirose (JAMSS), Y. Itabashi (JAXA), H. Shibayama (JAXA), M. Wada (JAXA)
Title Explainable symptom detection in telemetry of ISS with Random Forest and SpecTRM
Outline Flight controllers of the JEM (Japanese Experiment Module), one element of the International Space Station (ISS), are continuously monitoring ISS status, and it is important for them to detect signs of anomaly of its equipment as early as possible. Automatic symptom detection, in this context, can help flight controllers to assess unusual telemetry trends. To assess the trends efficiently, it is essential to provide the reason of detections. In this paper, we propose a new systemic symptom detection method combining three methodologies: the Functional Resonance Analysis Method (FRAM), the Random Forest Regression (RF), and the Specification Tools and Requirement Methodology-Requirement Language (SpecTRM-RL). The method was verified with data of Low Temperature loop (LTL) of JEM; an actual failure event of pump inverter in LTL was selected as a case study. In this case study, a selected objective variable was successfully predicted based on explanatory variables in normal period, whereas the predicted values showed larger deviation from the actual measured values in off-nominal period. The information for explaining the cause of anomaly was eventually identified with the proposed methods and validated by engineering knowledge. These results show the effectiveness of the new methods as the explainable machine learning-based predictive failure detection. The proposed method can be applied to fields where a single mishap of a system could lead to catastrophic hazard or instantaneous loss of human life due to impossibility of physical access (e.g., deep space explorations and remote medicine).
Conference 2022 IEEE Aerospace Conference

Poster/Oral presentation

Date Mar. 2022
Author T. Fukumaki(JANUS), M. Motoyama(JGC), Na. Tamura(JNFL)
Title Decomposition Rate of Asphalt under the Presence of Microorganisms in the Coarse Sandstone Layer.
Outline As a part of the safety assessment of a disposal facility for low-level radioactive waste, the decomposition rate of bitumen (asphalt) in the presence of microorganisms in soil (in rocks) was determined to be less than 1 g/m2/y, in addition to the cold and alkaline field environment. The microbial flora before and after the degradation test were also compared, and the predominance of cold- and alkaline-resistant microorganisms was observed.
Conference Atomic Energy of Society of Japan　2022 Annual Meeting, Online Meeting

Publication

Date Feb. 2022
Presenter I. Fujii, M. Maekawa, N. Shimizu(JANUS), N. Kanda(JANUS), N. Mikuni, K. Suzuki, I. Tsurita, M. C. Balgos, M. K. Vierros
Title Implications of existing capacity building efforts for the conservation and sustainable use of marine biological diversity of areas beyond national jurisdiction: A case study of Japan.
Outline Capacity building and the transfer of marine technology (CB&TT) are key parts of negotiations at Intergovernmental Conferences on an international legally binding instrument regarding the conservation and sustainable use of marine biological diversity of areas beyond national jurisdiction (BBNJ). Throughout the negotiations, divergent views persisted among overnments. One possible reason for such a situation is the lack of comprehensive understanding of existing CB&TT efforts. In this case study, we assessed how these existing efforts could contribute to capacity building for the effective implementation of a newly proposed BBNJ agreement and recommendations are advanced to the UN member states on discussing how to build future initiatives of CB&TT upon existing efforts.
Journal Marine Policy (Elsevier)

Contributed article

Date Jan. 2022
Author T. TAKAHASHI, Y. FUKAYA, T. IIMOTO, Y. UNI, T. KATO, S. SUN, S. TAKEDA, K. NAKAI, R. NAKABAYASHI, S. UCHIDA, K. TAGAMI and M. HIRAYAMA
Title Activity Report of the Task Group on Parameters Used in Biospheric Dose Assessment Models for Radioactive Waste Disposal
Outline For the safety assessment of radioactive waste disposal, many environmental transfer parameters are used in biospheric dose assessment models. To set these parameter values, we generally refer to the database compiled by various organizations such as IAEA, NCRP, and USDOE, etc. Because transparency of the values is an important factor to provide reliable dose assessment results, the task group on parameters used in the models for radioactive waste disposal (FY 2019–2020) was aimed to discuss the current status of these parameters and to clarify future works necessary for dose assessment, especially in Japan.
We provided herewith the summary report of this task group.
Journal Japanese Journal of Health Physics

Poster/Oral presentation

Date Jan. 2022
Author Y. Yamamoto(JANUS)
Title Activities for 80-year operation of nuclear power plants in US
Conference Academic Lecture Meeting Organized by Hokkaido Office of Atomic Energy Society of Japan

2021

Contributed article

Date Nov. 2021
Author Undarmaa Baatarkhuu (JANUS)
Title Global SMR development: United States
Outline Wrote a survey report about the development of small modular reactors (SMR) in the United States, as contribution to the Feature article "Global SMR Development" in the monthly "Energy Review" magazine (December 2021).
Journal Monthly Energy Review (December 2021)

Poster/Oral presentation

Date Nov. 2021
Author M. KUDO (JANUS)
Title Progress of JCM-FS project: CCS
Outline M. KUDO delivered the presentation about the current status and the future plan of the Gundih CCUS project, that is currently being studied by 5 parties (PT Pertamina(Persero), Bandung Institute of Technology, JANUS, JGC and J-POWER), aiming at the CCUS implementation in Gundih gas field of Central Java under the supports of Indonesia and Japan governments.
Conference Green Innovation to Contribute to Energy Transition in the Asian region with JCM and CEFIA at Japan Pavilion, COP-26

Publication

Date Sep. 2021
Presenter Y. Kawashima(JANUS), Y. Onishi(Idea), N. Tatarazako(Ehime U.), H. Yamamoto(JANUS), M. Koshio(NIES), T. Oka(NIES), Y. Horie(NIES), H. Watanabe(NIES), T. Nakamoto(Idea), J. Yamamoto(Idea), H. Ishikawa(Idea), T. Sato(Yokohama City U.), K. Yamazaki(MoE), T. Iguchi(Yokohama City U.)
Title Summary of 17 chemicals evaluated by OECD TG229 using Japanese Medaka, Orytias latipes in EXTEND 2016
Outline Summary of 17 chemicals evaluated by OECD TG229 using Japanese Medaka, Orytias latipes in EXTEND 2016
Journal Journal of Applied Toxicology, WEB

Publication

Date Sep. 2021
Presenter M Lips1, E Anderson2, T Nakamura3, F Harris4, G Schneider5, J Zic6, C Sanders7, J Owen8, J Hondros9 and A de Ruvo9,*
1 Kernkraftwerk Gösgen-Däniken, Postfach CH-4658 Däniken, Switzerland
2 Radiation Safety & Control Services, Seabrook, NH, United States of America
3 Japan NUS Co, LTD, Tokyo, Japan
4 Rio Tinto, Brisbane, Australia
5 Namibian Uranium Institute, Swakopmund, Namibia
6 Mc Master University, Hamilton, Canada
7 University of Nevada, Las Vegas (UNLV), Las Vegas, NV, United States of America
8 BHP—Olympic Dam, Adelaide, Australia
9 World Nuclear Association, London, United Kingdom
Title Reflections on low-dose radiation, the misconceptions, reality and moving forward
Outline Low dose radiation has been widely accepted by the radiation protection community as presenting a very low risk to human health, if any. Over-conservatism in optimisation principles and regulations have resulted in a disproportionate fear of radiation amongst the general public and government authorities alike,overlooking the great benefits nuclear science and techniques have brought to society as a whole. As such, the World Nuclear Association advocates for a recontextualisation of the radiation hazards with regards to low dose radiation, and a greater awareness as to the absence of any discernible effects associated with it.
Journal Journal of Radiological Protection (IOPSCIENCE)

Publication

Date Sep. 2021
Presenter I. Fujii（Ocean Policy Research Institute, Sasakawa Peace Foundation；Graduate School of Agricultural and Life Sciences, University of Tokyo）、Y. Okochi（JANUS）、H. Kawamura（JANUS）
Title Promoting cooperation of monitoring, control, and surveillance for IUU fishing in the Asia-Pacific.
Journal Sustainability (MDPI)

Poster/Oral presentation

Date Aug. 2021
Author N. Susuki (JANUS)
Title Examples of AI Application and Development in Nuclear Power Plant Maintenance in the US and European Countries
Outline Nowadays, more and more technologies of AI including machine learning and deep learning are being developed. Using AI, we can automate recognition, prediction and implementation of something. Although introducing these technologies to the nuclear industry is difficult, it can be the best solution to solve problems we are facing such as plant efficiency and labor shortage. In the US and some European countries, they have already put AI into practice in the field of nuclear power plant maintenance as the automation of tasks of condition reports, the anomaly detection of components, making digital manuals and chatbot etc. In addition, some advanced researches, for example, monitoring fire, a hybrid AI and computational mechanics approach for the life estimation of components, quantifying the uncertainty and planning of actions during accidents, are being done. Finally, a Federal Register was published in April 2021 about NRC gathering information on the nuclear industry’s state of developing and introducing AI.
Conference Subcommittee on "Research and Study on Advancement of Condition Monitoring Technology"
First subcommittee meeting in 2021 (Japan Society of Maintenology)

Publication

Date Jul. 2021
Presenter Y. Oonishi(Idea), N. Tatarazako(Ehime U.), M. Koshio(NIES), T. Okamura(Idea), H. Watanabe(NIES), A. Sawai(Idea), J. Yamamoto(Idea), H. Ishikawa(Idea), T. Satou(Yokohama City U.), Y. Kawashima(JANUS), K. Yamazaki(MoE), T. Iguchi(Yokohama City U.)
Title Summary of reference chemicals evaluated by the fish short-term reproduction assay, OECD TG229, using Japanese Medaka, Oryzias latipes
Journal Journal of Applied Toxicology, Vol.41,1200-1221.

Contributed article

Date Jul. 2021
Author N. Susuki (JANUS)
Title Examples of AI Application and Development in Nuclear Power Plant Maintenance in the US and European Countries
Outline Nowadays, more and more technologies of AI including machine learning and deep learning are being developed. Using AI, we can automate recognition, prediction and implementation of something. Although introducing these technologies to the nuclear industry is difficult, it can be the best solution to solve problems we are facing such as plant efficiency and labor shortage. In the US and some European countries, they have already put AI into practice in the field of nuclear power plant maintenance as the automation of tasks of condition reports, the anomaly detection of components, making digital manuals and chatbot etc. In addition, some advanced researches, for example, monitoring fire, a hybrid AI and computational mechanics approach for the life estimation of components, quantifying the uncertainty and planning of actions during accidents, are being done. Finally, a Federal Register was published in April 2021 about NRC gathering information on the nuclear industry’s state of developing and introducing AI.
Journal The 17th Academic Lecture (Japan Society of Maintenology)

Poster/Oral presentation

Date Jun. 2021
Presenter M. KUDO(JANUS)
Title Gundih CCUS Project - International Collaboration between Indonesia and Japan
Outline The current status and the future plan of the Gundih CCUS project, that is currently being studied by 5 parties (PT Pertamina(Persero), Bandung Institute of Technology, JANUS, JGC and J-POWER), aiming at the CCUS implementation in Gundih gas field of Central Java under the supports of Indonesia and Japan governments.
Conference The First Asia CCUS Network Forum ( Co-hosted by Ministry of Economy, Trade and Industry and Economic Research Institute for ASEAN and East Asia　)

Poster/Oral presentation

Date May 2021
Presenter H. KATO(JANUS / JNK Environmental Research & Consulting), M. OKAI(JNK Environmental Research & Consulting)
Title Amendment of Environmental Protection Law & Environmental Impact Assessment in Vietnam
Outline The number of companies expanding in Vietnam is increasing, leading to an escalating need for knowledge about legal compliance and environmental regulations. In that scenario, JNK ENVIRONMENTAL RESEARCH & CONSULTING CO., LTD our local subsidiary, has held a webinar on "Vietnam's Environmental Protection Law Amendment & Environmental Impact Assessment" in collaboration with I-GLOCAL Co., Ltd., a consulting company specializes in supporting investment promotion, tax and accounting activities in Vietnam. Based on the experience of working in Vietnam after its establishment, Mr. Okai and Mr. Kato of JNK ENVIRONMENTAL RESEARCH & CONSULTING CO., LTD gave speech of explanations and advice Environment Impact Assessment (EIA).
Conference Web seminar I-GLOCAL-sponsored

Contributed article

Date Apr. 2021
Author M. Nakamura (JANUS)
Title Member Perspective
Outline Comments on the members perspective of the Radiation Protection Working Group were published in the annual report of the World Nuclear Association (NWA).
Journal At Work: our annual report (World Nuclear Association)

Contributed article

Date Apr. 2021
Author T. TAKAHASHI (Kyoto University), S. UCHIDA (National Institutes for Quantum and Radiological Science and Technology, JNUS), K. TAGAMI (National Institutes for Quantum and Radiological Science and Technology), R. NAKABAYASHI (Central Research Institute of Electric Power Industry), T. KATO (Japan Atomic Energy Agency), S. TAKEDA (Japan Atomic Energy Agency), Y. FUKAYA(JANUS), S. SUN (The University of Tokyo, JANUS), M. HIRAYAMA (JANUS), K. NAKAI (JGC Japan Corporation)
Title Parameters Used in Biospheric Dose Assessment Models for Radioactive Waste Disposal
Journal Institute for Integrated Radiation and Nuclear Science, Kyoto University

Poster/Oral presentation

Date Mar. 2021
Presenter R. Sule1*, A. Alfian1, M. F. Al-Hakim1, S. Chandra1, T. Matsuoka2, K. Okatsu3, Y. Sadamichi3, T. Kawashima3, D. Santoso1, W. G. A. Kadir1, P. Suardana4
1; Institut Teknologi Bandung, Bandung, Indonesia
2; Fukada Geological Institute, Tokyo, Japan
3; Japan NUS Co., Ltd., Tokyo, Japan
4; Directorate of Oil and Gas, Ministry of Energy and Mineral Resources, Republic Indonesia
Title Maximizing the utilization of emitted CO2 from gas field by implementing CO2 source and sink clustering
Outline This study addresses an effort to map potential of CO2-EOR and CO2-EGR nearby East Java oil and gas fields as well as power plant in Indonesia. It is hoped that this study could be used as a reference on how to develop cost efficient CO2-EOR and CO2-EGR in Indonesia.
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3822003
Conference 15th International Conference on Greenhouse Gas Control Technologies GHGT-15
IEA Greenhouse Gas R&D Programme (IEAGHG)

 

Publication

Date Jan. 2021
Presenter K. Tagami*1, Y. Fukaya*2, M. Hirayama*2, and S. Uchida*1*2
*1 National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology
*2 Japan NUS Co., Ltd.
Title Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios
Outline The fate of strontium-90 (90Sr) from water to aquatic biota is of concern since the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident because of continuous small 90Sr releases to the seawater from the FDNPP site. The Japanese diet includes many edible marine and freshwater species, and the environmental parameter, that is, the concentration ratio (CR) from water to biota, is useful to estimate the potential 90Sr intake, especially from frequently consumed seafoods. However, widely used CR data for radiation dose assessment only have provided values for biota types such as fish, crustaceans, macroalgae, and so forth, and thus, it is difficult to identify specific data for each species. In this study, therefore, we collated CR data of Sr for aquatic biota by surveying available open data sources from the 1950s to 2019, not only for edible parts but also for whole and inedible parts. In total, we obtained 3800 CR data: 3013 data for marine biota, 28 data for brackish water biota, and 759 data for freshwater biota. The results showed that species-specific CRs may decrease the uncertainties compared to those published in IAEA documents; however, different diets and living areas by species may lead to different uncertainties for different species.
Journal Environ. Sci. Technol. 2021, 55, 1637−1649 (American Chemical Society)

Poster/Oral presentation

Date Jan. 2021
Presenter Y. Fukaya1, S. Sun1, M. Hirayama1, T. Sugiyama1, K. Tagami2 and S. Uchida1,2 
1 Japan NUS Co., Ltd., 
2 Natl. Inst. Quantum & Radiol. Sci. Technol
Title A Review of Transfer Parameters of I, Cs and Pu (1) -Feed Transfer Coefficients in Cow’s Milk-
Outline Internal dose from the ingestion of contaminated agricultural products is an important portion in the radiation dose assessment for nuclear waste management. It is reported that cow's milk is the biggest contributor of internal dose in the early stages of the Chernobyl nuclear accident1. Cow's milk is consumed by infants; they are relatively sensitive to radiation compared to adults2. The radionuclide transfer coefficient from feed to milk (Cft_milk) is therefore also one of the important environmental transfer parameters for radiation dose assessment for discharged radionuclides. Many countries use Cft_milk values compiled in the IAEA Technical Report Series in mathematical models for dose assessment. These data were originally from old data sources; however, to keep the transparency of the dose assessment results, it is necessary to clarify the accuracy of the data, and it is also important to compare them with recently available data. In this study, therefore, we carried out literature survey by tracking sources listed in the IAEA reports, and compared those data with recently published data obtained by research institutes in many countries and regions.
Conference 15th International Congress of the International Radiation Protection Association (IRPA15) 
IRPA15 International Congress Organizing Committee (ICOC)

Poster/Oral presentation

Date Jan. 2021
Presenter M. Hirayama1*, Y. Fukaya1, S. Syi1, T. Sugiyama1, K. Tagami2, and S. Uchida1,2
1 Japan NUS Co., Ltd., 
2 Natl. Inst. Quantum & Radiol. Sci. Technol
Title A Review of Transfer Parameters of I, Cs and Pu (2)
 -Concentration Ratios in Freshwater and Marine Fish-

A Review of Transfer Parameters of I, Cs and Pu (3) -Concentration Ratios of I and Pu in Marine Biota-
Outline In part (1) we reviewed references used for the transfer coefficient from feed to cow’s milk of Cs, I and Pu and compared those data with recently published data. In part (2), we have reviewed water-to-fish concentration ratio (CR) data to reconfirm the validity of the original values used in transfer parameter summary reports, such as prepared by the Atomic Energy Society of Japan, and to compare the recommended CR data with newly reported values. We back-traced the references used in the parameter summary reports and found that the CR data did not change much from the values in the 1960’s and 1970’s for both freshwater and marine fish. We note that due to the difficulty to find the original data in easily accessible digital forms, not all of the original data in the old publications were confirmed, but because experts had judged and provided these recommended data, these data may be assumed to be reliable. Our new data survey showed that not many data were available for I and Pu; for Cs reported values were almost the same as reported in summary reports.
Conference 15th International Congress of the International Radiation Protection Association (IRPA15) 
IRPA15 International Congress Organizing Committee (ICOC)

2020

Poster/Oral presentation

Date Nov. 2020
Presenter Y. Sadamichi(JANUS)
Title Cost, Economic and Financing of CCS
Outline Dr. Sadamichi of JANUS delivered a lecture on CCUS in terms of economics and CO2 monetarization as one of lectures given by different experts in the ITB-IEAGHG CCUS Virtual Course 2020.
Conference ITB-IEAGHG CCUS Virtual Course 2020

Poster/Oral presentation

Date Nov. 2020
Presenter Y. Sadamichi(JANUS)
Title Introduction of CCUS Feasibility Study on Gundih Gas Field in Central Java, Indonesia
Outline This presentation is to introduce the CCUS feasibility study on Gundih gas field, which has been conducted in 2020 jointly by Indonesia and Japan team including Bandung Institute of Technology, JANUS and J-POWER.
Conference Third East Asia Energy Forum - Role of Carbon Capture Utilisation and Storage (CCUS)/Carbon Recycling in ASEAN/East Asia -

Poster/Oral presentation

Date Oct. 2020
Presenter S. Iino (JAMSS), M. Sasaki, S. Ishizawa, T. Fukui, Y. Ishitsuka (JANUS), N. Hoshino, S. Onishi, H. Nomoto (JAMSS), Y. Itabashi, H. Shibayama (JAXA)
Title Predictive anomaly detection of system equipment at International Space Station using machine learning
Outline In the International Space Station(ISS), the status of several system equipment are monitored by ground operators. If the onboard equipment are failed, it is required to replace the damaged equipment as early as possible. Predictive anomaly detection enables to start the consideration of replacement before failure. We propose the machine learning based predictive anomaly detection of system with training the normal data of telemetry. The method are verified with the data of low temperature loop of Japanese Experimental module of ISS. This method can be also applied to several space system such as an interplanetary probe, Gateway and lunar and mars rover. Upgrading models and combining other methods such as formal methods will be considered to increase the accuracy and the completeness.
Conference The 64th conference of the Japan Society for Aeronautical and Space Sciences

Poster/Oral presentation

Date Oct. 2020
Presenter Y. Kishimoto(JANUS)
Title Issues for commercialization of CCS - Long-term responsibility -
Outline Long-term responsibility is a major issue in promoting CCS commercialization. For discussion, overseas cases and outline the closure standards for landfill final disposal sites in Japan are introduced shortly.
Conference Japan-Asia CCUS Forum 2020

Contributed article

Date Aug. 2020
Author S. NAKAJIMA, M. MIKI
Title Ocean survey used for Autonomous Underwater Vehicle and Remotely operated vehicle.
Outline Unconventional Marine Survey Methods Using Tools Such as AUV
Journal Journal of Japan Society for Impact Assessment, Japan Society for Impact Assessment

Contributed article

Date Jul. 2020
Author R. TAHARA
Title Additive Manufacturing Technologies for Nuclear Engineering in the U.S.
Journal Japan Society of Maintenology
"MAINTENOLOGY"Vol.19 no.2

Publication

Date Apr. 2020
Presenter H. KATOH(JNK) and others
Title Differences in activities of two antioxidative enzymes,superoxide dismutase and catalase, in gills and red blood cells of yellowtail, red sea bream and Japanese flounder, as a possible cause of different tolerances to Chattonella marina blooms
Outline This study aimed to investigate the different susceptibility to a harmful microalga, Chattonella marina, between the yellowtail, Seriola quinqueradiata (YT), the red sea bream, Pagrus major (RSB), and the Japanese flounder, Paralichthys olivaceus (JF) by comparing activities of superoxide dismutase (SOD) and catalase in the gills and the red blood cells.
Journal Aquaculture Science(APR 2020)Vol.68-1

Publication

Date Feb. 2020
Presenter K. Usami(JANUS) and others
Title Variations in sediment lithology of submarine flood deposits on the slope off Kumano River, Japan
Outline Major river flood is a typical geohazard frequently characterized by the transportation of large quantities of terrigenous material from the land to the sea. However, the types and patterns of flood material deposition and the influence on sea floor environments differ because of the diversity in geological and climatic conditions. In September 2011, the activity of typhoon 201112 produced severe rainfall in the central Kii Peninsula and caused a large flood along the Kumano River. The event was considered a once-in-a-century scale flood. We examined the occurrence of flood deposits along the slope off the mouth of Kumano River in four surface sediment cores collected around two months after the 2011 flood. We found a thin and muddy event bed at the core top of three cores, with two or three event beds corresponding to past historical flood events. The sediment thickness, grain size, and sedimentary structures for three historical flood deposits demonstrated significant variation. The thicknesses and the grain sizes of three flood deposits from the same river show no relationship with the maximum discharge from each flood. The differences in the types and fate of sediments discharge during the floods probably account for the variations.
Journal The Geological Society, London
https://doi.org/10.1144/SP501-2019-53

2019

Contributed article

Date Oct. 2019
Author R. TAHARA
Title R&D and Innovations for Accident Tolerant Fuel in the U.S.
Journal Japan Society of Maintenology
"MAINTENOLOGY"Vol.18 no.3

Publication

Date Jun. 2019
Presenter A. Takamasa(JANUS) and H. Toma(JANUS) and others
Title Insights to the UK's impending departure from Euratom: Case study of UK nuclear safeguards and radiation protection in light of Brexit
Outline One of the first pieces of legislation addressing the UK's departure from the EU/Euratom to complete its passage through Parliament is the Nuclear Safeguards Act 2018, which will enable the government to establish a domestic nuclear safeguards regime. This was driven by the need to prevent vulnerability to a vital energy system and indicates the short to medium term approach the UK has to its policymaking post-Brexit: dealing with issues immediately impacted, such as ensuring the continued supply of nuclear fuel. The contribution of this paper is the examination of two particular areas under the responsibility of Euratom – nuclear safeguards and radiation protection – that are presented to indicate the wider impact Brexit has in other areas currently the responsibility of the EU, for example, chemical safety. It shows that the UK has significant gaps in responsibility currently undertaken by Euratom (or other EU institutions) that need to be filled by UK bodies. Which bodies will assume these responsibilities and what resources will be available remain open questions. This case study highlights the need for systematic prioritisation by the UK government when filling the void of EU/Euratom institutions.
Journal Energy Policy Volume 129, June 2019, Pages 1416-1422

Poster/Oral presentation

Date May 2019
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Projects
Outline This presentation will deliver the result of analysis of assessment methods, specific environmental impacts actually assessed in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference IAIA19 Brisbane Australia

Contributed article

Date Mar. 2019
Author Y. Ohkubo
Title Operation Period in overseas nuclear power plant
Journal Monthly ENERGY FORUM

Poster/Oral presentation

Date Mar. 2019
Presenter Y. Fukaya, S. Sun, K. Ichikawa, T. Sugiyama (JANUS)
S. Uchida, K. Tagami (QST-NIRS)
T. Kato(JAEA)
Title Tracking survey of transport parameters used for exposure assessment related to radioactive waste disposal etc. 1: Feed - animal products transfer coefficient
Conference The 20th Workshop on Environmental Radioactivity

Publication

Date Feb. 2019
Presenter S. Kobayashi(JANUS), I. Katsuyama(JANUS) and others
Title Designing a laboratory bioassay for evaluating the efficacy of antifouling paints on Balanus amphitrite using a flow-through system
Outline With the aim of establishing a protocol for evaluating the efficacy of antifouling paints, a flow-through laboratory test using triangular prisms was developed for cyprids of the barnacle Balanus amphitrite.
Journal MDPI(Multidisciplinary Digital Publishing Institute)

Poster/Oral presentation

Date Feb. 2019
Presenter I. Katsuyama(JANUS) , Y. Sadamichi(JANUS)
Title Biofouling and its Solutions for Seawater-Related Facilities in Power Plants
Outline Biofouling management is essential in the aspect of plant economics and reliable operation in power plants where seawater is used for cooling system. However, it is not easily achieved in most of the plants due to its complexity. This presentation gives clear explanation of creatures that cause biofouling and their variety of countermeasures.
Conference 2018 Technical Seminar of Thermal and Nuclear Power Engineering Society

2018

Contributed article

Date Dec. 2018
Author Y. KAWASHIMA
Title Reliablity assessment of papers on Endocrine disruptors in the EXTEND2016 of MoE, Japan.
Outline Janus is acting as a secretariat of EXTEND2016 which is the main programme on endocrine disruptors. Informing the key art of reliability assessment of papers to younger researchers.
Journal News Letter, Vol.21, No.3, Japan Society of Endocrine Disrupter Research

Poster/Oral presentation

Date Nov. 2018
Presenter Y.　MATSUNAGA(JANUS)
Title Back ground and cause of differences between “science and technology communication” and “risk communication”
Conference The Society for Risk Analysis Japan

Publication

Date Oct. 2018
Presenter K. ITO(JANUS) , N.TERAURA(errara Code Research Institute)
Title Effective Utilization of Radiation Resistant RF Tag in the Decommissioning Work Management
Outline We discuss the effective utilization of radiation resistant RF tags for radioactive waste management during the decommissioning works. Our tag can prevent the corruption of the data stored in RF tag memory due to radiation damage.
Journal The fourth International Conference on Maintenance Science and Technology (ICMST 2018)

Poster/Oral presentation

Date Sep. 2018
Presenter S. Sun1,2, Y. Nogami1, T. Sugiyama1 and T. Iimoto2
1 JANUS
2 The University of Tokyo
Title Discussion on NORM Management under Japanese Situation Based on Graded Approach
Conference 9th International Conference on High Level Environmental Radiation Areas - For Understanding Chronic Low-Dose-Rate Radiation Exposure Health Effects and Social Impacts (ICHLERA 2018)

Contributed article

Date Aug. 2018
Author K. Ishida, S. Iwai, T. Senba (JANSI) , H. Toma (JANUS)
Title Mechanisms of thyroid carcinogenesis
Journal Atomic Energy Society of Japan

Contributed article

Date Jul. 2018
Author M. KOBAYASHI (National Maritime Research Institute), Y. NIWA (National Maritime Research Institute), J. FUKUTO (National Maritime Research Institute), K. IWASAKI (JANUS)
Title Detection of ships and recognition of ship types from images using deep learning
Outline Development of a system for detection of ships and recognition of ship types from images using deep learning.
Journal KANRIN 79 2018/7

Poster/Oral presentation

Date Jun 2018
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline This presentation will deliver the result of analysis of assessment methods, impacts actually assessed and management measures described in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference International Ocean and Polar Engineering (ISOPE)

Poster/Oral presentation

Date May 2018
Presenter M. Kitagawa(JANUS)
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline This presentation will deliver the result of analysis of assessment methods, impacts actually assessed and management measures described in Environmental Impact Assessment Reports for oil and gas development made in advanced countries.
Conference Oceans '18 MTS/IEEE Kobe/Techno-Ocean 2018

Poster/Oral presentation

Date May 2018
Presenter H. Nagako (JANUS),T. Hideshige ・Y. Rei・S.Hiroya (Tokyo university of agriculture and technology), W. Yutaka ・ Tanaka Kosuke(Hokkaido university)
Title Global surveillance of plastic-derived contaminants and POPs in seabirds by using preen gland oil
Outline In order to survey plastic pollution of seabirds, we analyzed plastic additives (brominated flame retardants; PBDEs, DBDPE, TBB, BTBPE, HBCD, phthalates, UV absorbers; benzophenone and benzotriazole) and POPs (PCBs, DDTs, HCHs) in preen gland oil of seabirds. BDE209, DBDPE or phthalate were detected in 31% of individuals and they were suggested to be polluted by chemicals in ingested plastics.
Conference Japan society for environmental chemistry

2017

Poster/Oral presentation

Date Nov. 2017
Presenter T. TANI, Y. MORIWAKE, R. YAMASE
Title Research and business development support for biotechnology process -from basic research to business development-
Conference Japan Management Association

Poster/Oral presentation

Date Oct. 2017
Presenter Y. MATSUNAGA
Title Survey the changes of Risk Communication affected by the Great East Japan Earthquake.
Outline The promotion plan for Risk Communication” notes that when the Great East Japan Earthquake occurred, the community of science and technology could not communicate the public scientific knowledge and hadn’t communicated on the risks enough. Other side, risk communication has been done in some fields (ex. chemicals, foods, nuclear) even before the Great East Japan Earthquake. This is a result of a questionnaire filled out by whom have been engaged in risk communication before the Great East Japan Earthquake. Some lessons and problems showed in the survey and guessed as good suggestions for promoting and improving risk communication.
Conference The Society for Risk Analysis Japan

Contributed article

Date Sep. 2017
Author T. TANI
Title Untapped potential - Across Asia there are great opportunities for biofuels, but progress remains slow.
Outline JANUS's comments on the development and prospects of biofuels in Japan are cited in the article by Mr. Colin Ley, a journalist.
Journal biofuels international, 11(5), 20-21, 2017

Poster/Oral presentation

Date Aug. 2017
Presenter R. NAKAMURA
Title Status on Environmental Qualification of Electrical Component in Foreign Country
Outline Demonstration that the electric equipment important to safety can perform the required function in harsh environment during/after design bases accident by the end of life is called “Environmental Qualification”. EQ is regulatory requirement and licensing bases in the US and many countries. In the US regulation, it is required to develop EQ program, EQ component list and to maintain EQ data and records. Also the US NRC has started the EQ program inspection as a first design bases assurance inspection from 2017. Maintenance has important contribution to maintain an effective EQ program.
Conference Japan Society of Maintenology

Contributed article

Date Aug. 2017
Author M. NASU, S. NAKAJIMA, M. KITAGAWA
Title Environmental Impact Assessment for Offshore Oil and Gas Developments
Outline To consider how to assess environmental impacts and what environmental measures to be taken for the future oil and gas developments in the deep water around Japan, EIA procedures and legal requirements for EIA of advanced eight countries were researched. In addition, EIA reports prepared in five countries were collected and their assessment methods and impacts to be assessed were analyzed.
Journal Journal of Japan Society for Impact Assessment

Poster/Oral presentation

Date Jun. 2017
Presenter K. Seki
Title Distribution of veterinary antibiotics in Asian waters
Outline Antibiotics are widely used, not only for treating human infections, but also for treatment of livestock and in fish farms. In this study, we collected surface water samples from 129 sites in Asia and manure samples from 56 sites in Japan and measured concentrations of 26 antibiotics. The concentrations of antibiotics in livestock wastewaters were much higher than the concentrations of antibiotics in urban canals. The human populations in Asia are at risk of exposure to antibiotics and antimicrobial resistant bacteria (ARB), and thereby disseminating antimicrobial resistance genes (ARGs).
Conference The 26th Symposium on Environmental Chemistry

Poster/Oral presentation

Date Mar. 2017
Presenter K. ITO
Title JSM Maintenance Semniar 2017, Regulations and Industry Standards on Maintenance in US Nuclear Power Plants
Conference Japan Society of Maintenology (JSM)

2016

Publication

Date Dec. 2016
Presenter R.Kojima, S.Kobayashi, C.G.P.Satuito, I.Katsuyama, H.Ando,Y.Seki, T.Senda
Title A method for evaluating the efficacy of antifouling paint using Mytilus galloprovincialis in the laboratory in a flow-through system
Outline A laboratory test with a flow-through system was designed and its potential application for testing antifouling paints of varying efficacies was investigated. Six different formulations of antifouling paints were prepared to have increasing contents (0 to 40 wt.%) of Cu2O, which is the most commonly used antifouling substance, and each formulation of paint was coated on one surface of a test plate. The test plates were aged for 45 days by rotating them at a speed of 10 knots inside a cylinder drum. A behavioral test was then conducted using five mussels (Mytilus galloprovincialis) that were pasted onto the coated surface of each aged test plate. The number of the byssus threads produced by each mussel generally decreased with increasing Cu2O content of the paint. The test was validated by comparing the laboratory results of efficacy with that from field experiments. The results were highly consistent with observations from the field experiment.
Journal PLOS ONE, Drcember 13 2016

Publication

Date Dec. 2016
Presenter S. Ueda, S. Hisamatsu, K. Nakata, T. Fukumaki, I. Yabe
Title Structural characteristics of the water current and halocline in brackish Lake Takahoko, Aomori.
Outline In order to elucidate characteristics of the water current and halocline in brackish Lake Takahoko, which has been partitioned by a levee with water gates at the center, in Aomori Prefecture, the salinity, current direction/velocity, wind direction/velocitya and water level were observed from July to November 2015.
Journal Advanced Marine Science and Technology Society

Contributed article

Date Oct. 2016
Author KATSUYAMA I.
Title International Academic Conference( ICMCF 2016 ) Participation Report
Outline 18th International congress on marine corrosion and fouling( ICMCF 2016 ) participation report.
Journal SESSILE　ORGANISMS

Poster/Oral presentation

Date Sep. 2016
Presenter OHWADA T.
Title Environmental Impact Assessment for nuclear power stations in Japan
Outline Introduction of Environmental Impact Assessment processes for nuclear power stations in Japan, and explanation of major issues in Environmental Impact Assessment for nuclear power stations
Conference Conference on the Prospects for Nuclear Power in the Asia Pacific Region

Poster/Oral presentation

Date Jun. 2016
Presenter KOBAYASHI S. , MATUMURA T. , KATSUYAMA I.
Title A flow-through method of laboratory testing for the efficacy of antifouling paints using three types of fouling organisms: barnacle, mussel and green algae
Conference 18th International Congress on Marine Corrosion and Fouling – ICMCF 2016

Poster/Oral presentation

Date May. 2016
Presenter NAGAKI M.
Title Current Situation regarding Nuclear Power in the U.S. and Europe -Trend of Change Learned from Abroad-
Outline As a current situation of nuclear power in the U.S. and Europe, the status of nuclear new build in these countries was discussed. Also discussed were the situation of decommissioning activities in the U.S. and anti-nuclear policy in Europe in response to accident at Fukushima.
Conference Japan Society of Maintenology, Subcommittee on International Activity

Poster/Oral presentation

Date Apr. 2016
Presenter SUGAYA J.
Title Status of Nuclear Operations and EUCG data in Japan
Conference 2016 EUCG Spring Conference & Workshop

Publication

Date Apr. 2016
Presenter Gen Nakamura（Tokyo University of Marine Science and Technology）, Ichiro Kadowaki（Tokyo University of Marine Science and Technology）, Shouka Nagatsuka（Tokyo University of Marine Science and Technology）, Ryotaro Hayashi（Tokyo University of Marine Science and Technology）, Naohisa Kanda（JANUS）, Mutsuo Goto（Institute of Cetacean Research）, Luis A. Pastene（Institute of Cetacean Research）, Hidehiro Kato（Tokyo University of Marine Science and Technology）
Title White Patch on the Fore-Flipper of Common Minke Whale, as a Potential Morphological Index to Identify Stocks
Outline Past studies have indicated that there are two different stocks (J and O stocks) in the North Pacific common minke whale Balaenoptera acutorostrata population. These two stocks differ from each other in certain characteristics, such as body size, conception dates, and genetics. However, till date, few studies have investigated differences in the external body appearance between the two stocks. Therefore, in the present study, we focused on the unique white patch on the flipper of this whale species to elucidate inter-stock differences. We used the animals collected from JARPNII research during 2012 and 2013; stock information was determined by microsatellite DNA analysis (n = 220). We focused on the morphological differences in the size and pattern of the white patch on the flipper of each whale. The length of the white patch along the anterior (ventral) margin of the flipper tends to be proportionally larger in O stock. The pattern of the boundary area of the white patch named as the “Grayish Accessary Layer (GAL)” was remarkably different between stocks. Within animals with “no GAL” type, 94% were J stock. Conversely, of animals with GAL expanding over the half the flipper width, 96% were O stock. We concluded from our study that there were clear morphological differences in the flipper color pattern between J and O stocks, which enable to apply widely to other individuals.
Journal Open Journal of Animal Sciences (SCIRP journals)

Publication

Date Apr. 2016
Presenter Gen Nakamura（Tokyo University of Marine Science and Technology）, Ichiro Kadowaki（Tokyo University of Marine Science and Technology）, Shouka Nagatsuka（Tokyo University of Marine Science and Technology）, Ryotaro Hayashi（Tokyo University of Marine Science and Technology）, Naohisa Kanda（JANUS）, Mutsuo Goto（Institute of Cetacean Research）, Luis A. Pastene（Institute of Cetacean Research）, Hidehiro Kato（Tokyo University of Marine Science and Technology）
Title White Patch on the Fore-Flipper of Common Minke Whale, as a Potential Morphological Index to Identify Stocks
Outline Past studies have indicated that there are two different stocks (J and O stocks) in the North Pacific common minke whale Balaenoptera acutorostrata population. These two stocks differ from each other in certain characteristics, such as body size, conception dates, and genetics. However, till date, few studies have investigated differences in the external body appearance between the two stocks. Therefore, in the present study, we focused on the unique white patch on the flipper of this whale species to elucidate inter-stock differences. We used the animals collected from JARPNII research during 2012 and 2013; stock information was determined by microsatellite DNA analysis (n = 220). We focused on the morphological differences in the size and pattern of the white patch on the flipper of each whale. The length of the white patch along the anterior (ventral) margin of the flipper tends to be proportionally larger in O stock. The pattern of the boundary area of the white patch named as the “Grayish Accessary Layer (GAL)” was remarkably different between stocks. Within animals with “no GAL” type, 94% were J stock. Conversely, of animals with GAL expanding over the half the flipper width, 96% were O stock. We concluded from our study that there were clear morphological differences in the flipper color pattern between J and O stocks, which enable to apply widely to other individuals.
Journal Open Journal of Animal Sciences (SCIRP journals)

2015

Poster/Oral presentation

Date Nov. 2015
Presenter KAWASHIMA Y.
Title Progress of EXTEND2010
Outline EXTEND2010 is developed by Ministry of the Environment, Japan as a new program for the next five years by maintaining the appropriate parts of ExTEND2005 (2005-2010) and adding necessary improvements.
It aims to properly assess the environmental risk of endocrine disrupting effects of chemicals and to take appropriate management measures.
The following three effects caused by endocrine disruption will be targeted, effects to reproduction - estrogen, anti-estrogen, androgen and anti-androgen, effects to development (such as metamorphosis) - thyroid hormone and effects to growth - ecdysone, juvenile hormone.
Framework for conducting ecotoxicity testing should be developed for ecological risk assessment caused by endocrine disruptors.
Following two actions/effects should be evaluated, identification of actions to endocrine system and characterization of adverse effects to organisms.

Progress of EXTEND2010 as of Sep. 2015.
Tier 1 in vitro assays (reporter gene assays) were conducted for 43 chemicals (117 assays) to see whether the suggested actions could be relevant to endocrine disruption.
The result shows that 24 chemicals were positive, 19 chemicals were negative.
Tier 1 in vivo assays (OECD TG229 Medaka) were conducted for 9 chemicals.
The result shows that estrogenic activity were detected in 5 chemicals, estrogenic activity were not detected in 2 chemicals, anti-estrogenic activity were not detected in 2 chemicals and adverse effects on reproduction were detected in 8 chemicals.
"Further Actions to Endocrine Disrupting Effects of Chemicals - EXTEND2010-"(July 2010)(EXTEND = Extended Tasks on Endocrine Disruption)
Conference The 63rd National Institute for Basic Biology Conference Environment to Bioresponse.

Publication

Date Nov. 2015
Presenter Werner Rühm, Gayle E. Woloschak, Roy E. Shore, Tamara V. Azizova, Bernd Grosche, Ohtsura Niwa, Suminori Akiba, Tetsuya Ono, Keiji Suzuki, Toshiyasu Iwasaki, Nobuhiko Ban, Michiaki Kai, Christopher H. Clement, Simon Bouffler, Hideki Toma(JANUS), Nobuyuki Hamada
Title Dose and dose-rate effects of ionizing radiation: a discussion in the light of radiological protection
Outline The biological effects on humans of low-dose and low-dose-rate exposures to ionizing radiation have always been of major interest. The most recent concept as suggested by the International Commission on Radiological Protection (ICRP) is to extrapolate existing epidemiological data at high doses and dose rates down to low doses and low dose rates relevant to radiological protection, using the so-called dose and dose-rate effectiveness factor (DDREF). The present paper summarizes what was presented and discussed by experts from ICRP and Japan at a dedicated workshop on this topic held in May 2015 in Kyoto, Japan. This paper describes the historical development of the DDREF concept in light of emerging scientific evidence on dose and dose-rate effects, summarizes the conclusions recently drawn by a number of international organizations (e.g., BEIR VII, ICRP, SSK, UNSCEAR, and WHO), mentions current scientific efforts to obtain more data on low-dose and low-dose-rate effects at molecular, cellular, animal and human levels, and discusses future options that could be useful to improve and optimize the DDREF concept for the purpose of radiological protection.
Journal Radiation and Environmental Biophysics

Poster/Oral presentation

Date Sep 2015
Presenter Katuyama I.
Title Biofouling of coastal thermal and nuclear power plant and its prevention method : chlorination
Conference Thermal and nuclear power engineering society Tohoku branch 2015 Technical workshop and tour

Poster/Oral presentation

Date Sep 2015
Presenter Matsumura T. , Kobayashi S. , Katsuyama I.
Title Method of new efficacy evaluation for antifouling paints by the Green Algae, Ulva prolifera
Conference The Japan Institute of Marine Engineering（JIME）Research Committee for Marine Enviroment Technologies

Publication

Date Aug 2015
Author Yoshihisa Kubota, Hideo Tsuji, Taiki Kawagoshi, Naoko Shiomi (National Institute of Radiological Sciences), Hiroyuki Takahashi (Tokyo Nuclear Services Co., Ltd), Yoshito Watanabe, Shoichi Fuma, Kazutaka Doi, Isao Kawaguchi (National Institute of Radiological Sciences), Masanari Aoki, Masahide Kubota, Yoshiaki Furuhata (Japan Wildlife Research Center), Yusaku Shigemura, Masahiko Mizoguchi (Japan NUS Co., Ltd.), Fumio Yamada (Forestry and Forest Products Research Institute), Morihiko Tomozawa (Keio University), Shinsuke H. Sakamoto (University of Miyazaki), and Satoshi Yoshida (National Institute of Radiological Sciences).
Title Chromosomal Aberrations in Wild Mice Captured in Areas Differentially Contaminated by the Fukushima Dai-Ichi Nuclear Power Plant Accident.
Outline Following the Fukushima Dai-ichi Nuclear Power Plant accident, radiation effects on nonhuman biota in the contaminated areas have been a great concern. The induction of chromosomal aberrations in splenic lymphocytes of small Japanese field mice (Apodemus argenteus) and house mice (Mus musculus) inhabiting Fukushima Prefecture was investigated. In mice inhabiting the slightly contaminated area, the average frequency of dicentric chromosomes was similar to that seen in mice inhabiting a noncontaminated control area. In contrast, mice inhabiting the moderately and heavily contaminated areas showed a significant increase in the average frequencies of dicentric chromosomes. Total absorbed dose rate was estimated to be approximately 1 mGy d–1 and 3 mGy d–1 in the moderately and heavily contaminated areas, respectively. Chromosomal aberrations tended to roughly increase with dose rate. Although theoretically, the frequency of chromosomal aberrations was considered proportional to the absorbed dose, chromosomal aberrations in old mice (estimated median age 300 days) did not increase with radiation dose at the same rate as that observed in young mice (estimated median age 105 days).
Journal Environmental Science & Technology, 2015, 49 (16), pp 10074–10083
Link http://pubs.acs.org/doi/pdf/10.1021/acs.est.5b01554

Poster/Oral presentation

Date Jul 2015
Presenter Ito K. , Tomita Y.
Title Recommendations related to the Problem of Limiting the Life of Japanese Nuclear Power Plants to 40 years, No.2 - Review of Overseas Countries Status
Conference The 12th Academic Symposium by Japan Society of Maintenology, July 2015

Poster/Oral presentation

Date Jul 2015
Presenter Katsuyama I.
Title Review of antifouling technique for cooling water system and its assesｓment
Conference Thermal and Nuclear Power Engineering Society

Poster/Oral presentation

Date Jul2015
Presenter Fujii Y.
Title The Advancement of Maintenance for Nuclear Power Plant in USA.
Conference the 12th Annual Conference, Japan Society of Maintenology

Publication

Date Jun 2015
Author Sakurai T. (Meisei University), Satake S. (Japan NUS Co., Ltd.) and Matsuda K. (Tokyo University of Agriculture and Technology).
Title Measurement of the Inorganic Ions in PM2.5 at Western Tokyo and the Evaluation for AQM Performance Based on the Measurement.
Outline Both of the component measurement and the analysis based on Air Quality Model (AQM) are essential for the consideration of PM2.5 reduction measures. In order to collect more information regarding PM2.5 components, long-term weekly measurement for inorganic ions in PM2.5 had been conducted from August 2009 to August 2011 at Meisei University, located in Western Tokyo. The performance of AQM was also clarified based on the comparison between CMAQ simulation and the observation. Observed SO42- and NO3- showed higher concentration in summer and winter season, respectively. Since the ratio of total amount of inorganic ions in PM2.5 mass concentration reached up to 75% in each February, reduction measures for the inorganic ions seemed to be more effective to decrease PM2.5 mass concentration especially in winter season. As AQM performance, a correlation coefficient of around 0.8 was obtained by the comparison with observed SO42-. However, AQM did not show a reasonable performance for NO3- and NH4＋ due to both of the sampling artifact originated in the volatilization of NH4NO3 and the model uncertainties especially for the overestimation of NO2 and O3. As a result, it was suggested for the improvement of Nitrate prediction that further observation studies for the volatilization and the precursors such as HNO3 and NH3 were important as well as the evaluation of overestimated NO2 and O3.
Journal Earozoru Kenkyu (Japan Association of Aerosol Science and Technology)

Poster/Oral presentation

Date May 2015
Presenter Nagaki M.
Title History and Current Status of Fire Protection Regulation for Nuclear Power Plant -Case Study of U.S. Regulation-
Conference the Annual Symposium 2015, Japan Association for Fire Science and Engineering

Poster/Oral presentation

Date May 2015
Presenter Nobuyuki Teraura (Terrara Code Research Institute, Japan), Kunio Ito (Japan NUS, Japan), Daisuke Kobayashi (Japan Atomic Energy Agency, Japan), Kouichi Sakurai (Kyushu University, Japan)
Title Evaluation of Gamma Ray Durability and its Application of Shielded RF Tags.
Outline The RF tag with radiation shield has been developed and its gamma ray durability has been evaluated in this study. RFID is an item’s identification technology which uses radio wave. By using the technology, RF tag is used to manage the items for its traceability and so on. RF tags include the active RF tag which has a voltaic cell, and a passive RF tag without a voltaic cell. Among them, since it is cheap and can be used over a long period of time regardless of a battery life, the passive RF tag is used in various fields. It is used for equipment maintenance of factories or thermal power plants, and the application examples are widely announced.
Several frequencies are used for RF tag, and RF tag of UHF has a communication range comparatively as long as about 10m, and a remote reading is possible. When it is used in radiation environment at nuclear power plant, the remote reading can contribute to radiation exposure reduction.
However, since semiconductors are the main elements of the function of RF tag, damage due to radiation happens in it, and an error of operation occurs. Therefore, this technology has not been used under relatively high radiological environment. Also in a nuclear power plant, the use has been very limited in a very low radiological environment.
Here, we have developed and manufactured the RF tag with radiation shield cover attached. Here, the communication which uses the radio wave for RF tag may not be affected. It is expected that this RF tag with radiation shield will improve the radiation-proof feature and its application rage will be expanded. Using the radiation-proof RF tag, we have conducted the radiation durability tests. Two types of test, using low energy gamma ray and high-energy gamma ray have been done. Here, the experimental result is described.
The applicability of RF tag with radiation proof capability is considered to become wider, and that can be used under various radiological environments, not only in the nuclear power plant but others, such as spent nuclear fuel storage facility, decommissioning of nuclear power plant, decontamination operation management around Fukushima area, etc.
Conference the 23th International Conference on Nuclear Engineering.

Poster/Oral presentation

Date Apr 2015
Presenter Katsuyama I.
Title Review of antifouling technique for cooling water system.
Conference Thermal and Nuclear Power Engineering Society (Japan)

Contributed article

Date Apr 2015
Author Horiuchi K. and Oka K.
Title Introduction to Plastination and its Usage.
Journal JEAS News, No.146 (Japan Assosciation of Environment Assessment)

Contributed article

Date Apr 2015
Author Nakamura R.
Title IAEA Activity for Long-term Safe Operation of Nuclear Power Plants. - SALTO peer review
Journal Hozengaku (Japan Society of Maintenology)

Poster/Oral presentation

Date Mar 2015
Presenter Shinohara C. and Kuwagaki R.
Title Development of CCS communications and knowledge sharing framework.
Conference the Spring Conference 2015 (Mining and Materials Processing Institute of Japan)

Poster/Oral presentation

Date Mar 2015
Presenter Shinagawa T
Title Environmental education exploring the nature around you: words left by Prof. Hamaguchi.
Conference the 21th Civic environmental activities meeting

Publication

Date Jan 2015
Author Yoshihisa Kubota (National Institute of Radiological Sciences), Hiroyuki Takahashi (Tokyo Nuclear Services Co., Ltd), Yoshito Watanabe, Shoichi Fuma, Isao Kawaguchi (National Institute of Radiological Sciences), Masanari Aoki, Masahide Kubota, Yoshiaki Furuhata (Japan Wildlife Research Center), Yusaku Shigemura (Japan NUS Co., Ltd.), Fumio Yamada (Forestry and Forest Products Research Institute), Takahiro Ishikawa, Satoshi Obara, Satoshi Yoshida (National Institute of Radiological Sciences).
Title Estimation of absorbed radiation dose rates in wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi nuclear power plant accident
Outline The dose rates of radiation absorbed by wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident were estimated. The large Japanese field mouse (Apodemus speciosus), also called the wood mouse, was the major rodent species captured in the sampling area, although other species of rodents, such as small field mice (Apodemus argenteus) and Japanese grass voles (Microtus montebelli), were also collected. The external exposure of rodents calculated from the activity concentrations of radiocesium (134Cs and 137Cs) in litter and soil samples using the ERICA (Environmental Risk from Ionizing Contaminants: Assessment and Management) tool under the assumption that radionuclides existed as the infinite plane isotropic source was almost the same as those measured directly with glass dosimeters embedded in rodent abdomens. Our findings suggest that the ERICA tool is useful for estimating external dose rates to small animals inhabiting forest floors; however, the estimated dose rates showed large standard deviations. This could be an indication of the inhomogeneous distribution of radionuclides in the sampled litter and soil. There was a 50-fold difference between minimum and maximum whole-body activity concentrations measured in rodents at the time of capture. The radionuclides retained in rodents after capture decreased exponentially over time. Regression equations indicated that the biological half-life of radiocesium after capture was 3.31 d. At the time of capture, the lowest activity concentration was measured in the lung and was approximately half of the highest concentration measured in the mixture of muscle and bone. The average internal absorbed dose rate was markedly smaller than the average external dose rate (<10% of the total absorbed dose rate). The average total absorbed dose rate to wild rodents inhabiting the sampling area was estimated to be approximately 52 μGy h−1 (1.2 mGy d−1), even 3 years after the accident. This dose rate exceeds 0.1–1 mGy d−1 derived consideration reference level for Reference rat proposed by the International Commission on Radiological Protection (ICRP).
Journal Journal of Environmental Radioactivity 142(2015) 124-131 （International union of Radioecology ）
Link http://www.sciencedirect.com/science/article/pii/S0265931X15000168
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