Problem and its background
The hazard (risk) of a chemical plant is evaluated as the product of the “frequency” of possible accidents and the “magnitude” of their impact. The impact of an accident varies depending on the plant and the characteristics of the accident, but typical examples include fires, explosions, and the spread of toxic substances, which can have human, physical, and environmental impacts on the surrounding area.
JANUS uses impact assessment tools to quantitatively evaluate the magnitude of impact (damage level) caused by these accidents.
The main evaluation items include the following :
- Concentration distribution due to diffusion of toxic gases
- Concentration distribution of flammable gases due to diffusion (lower explosive limit)
- Distribution of radiant heat level due to fire
- Distribution of blast pressure due to explosion