Quantitative risk assessment by CMMC method against forest fire for a sodium-cooled fast reactor

Suzuki, Minoru*; Kawashima, Masato*; Sakai, Takaaki*; Doda, Norihiro  ; Tanaka, Masaaki  

With an aim to establish a quantitative risk assessment of accident managements (AMs) for various external hazards, the plant dynamics analyses with Continuous Markov Chain Monte Carlo (CMMC) method were carried out for AM in cases of the filter exchange to recover the cooling function of the air coolers from soot and smoke and the firefighting from ambient temperature rise in forest fire event. The results indicated that this method can use for evaluation of effectiveness of AM measures repeatedly performed against forest fire events with respect to time progress and the AM measures against rising ambient temperature is important for fast reactors using air-cooling system.