A METHODOLOGY FOR RISK ASSESSMENT OF MAJOR FIRES AND ITS APPLICATION TO AN HTGR PLANT

摘要

A risk assessment methodology is presented for a specific class of reactor accidents, major fires. Principal elements of the methodology include collection and interpretation of experience data, identification and screening of important fire locations, event tree/fault tree analysis, and accident consequence assessment. About 900 reactor-years experience was examined for reported fires either during construction or plant opera-tion. Statistical analyses were performed of fire initiation and progres-sion characteristics such as occurrence rate, distance of fire spread, and time to bring fire under control.