Use and Limitations of Offsite Consequence Analysis Tools from South Korea and the United States in Hydrogen Fluoride Accidental Release

摘要

We investigated the characteristics and limitations in the event of hydrofluoric acid (HF) leakage by comparing and analyzingrnthe offsite consequence analysis (OCA) tools based on the chemical plant operating conditions. We reviewed the tools KorearnOffsite Risk Assessment (KORA) from South Korea and Risk Management Planu0002Comp (RMPu0002CompTM) and Areal Location ofrnHazardous Atmospheres (ALOHA) from the United States. The scenario studied was based on a leak event from a 50% HFrnaqueous solution storage tank, and the operating conditions taken into consideration were the operating temperature andrndike installation conditions. The results from the OCA differed; KORA presented a smaller range of offsite impact than didrnALOHA. The offsite impact ranges of KORA and ALOHA increased as the operating temperature and dike installation arearnincreased. However, RMPu0002Comp differed greatly in its offsite impact range results in the operating temperature range ofrn25 °C to 30 °C. Moreover, in the alternative scenario, a limitation existed in that the offsite impact range was not changed by therndike installation conditions. The offsite impact range analyzed via KORA and ALOHA reflected the reality of an HF leak accidentrnbetter than that analyzed via RMPu0002Comp. Therefore, it is more reasonable to use KORA and ALOHA instead of RMPu0002Comp inrnOCA. Moreover, users should realize that ALOHA has a somewhat wider range of offsite impact than KORA does in OCA. Thernseparation distance from the storage tank when installing a dike is effective between 1 and 1.5m in consideration of securingrnthe minimum workspace for workers.