| Keywords |
Calpuff Model; ALOHA; Ammonia; ERPG; Chemical accident |
| Abstract |
This paper compared and analyzed the extent of damage based on the ERPG Level by using ALOHA as the worst-case accident scenario condition and the CALPUFF model as the accident preparedness scenario condition in case of a leak accident at a hazardous chemical handling business. ALOHA's input information is nearby weather conditions such as temperature, humidity, wind speed, main wind direction, and atmospheric stability. Ground Roughness simulates atmospheric diffusion in an urban setting, and the CALPUFF model provides temperature, humidity, wind direction, and wind speed observed within a business site on a minute-by-minute basis. Atmospheric diffusion was simulated using meteorological conditions, 30 m grid of 2 km × 2 km area. The CALPUFF model has a longer damage distance than the ALOHA due to the reflection of actual weather change conditions and terrain conditions, and it is difficult to predict the damage area for the ALOHA. The CALPUFF model can predict the damage area, and the damage area for hazardous substances is It can be even more harmful to vulnerable residents such as children and the elderly. In the event of a leak, it is necessary to apply a model that can reflect weather conditions in real time. |