Parametric analysis on quantitative risk assessment against volcano ash hazard in a sodium cooled fast reactor

Suzuki, Minoru*; Sakai, Takaaki*; Takata, Takashi  ; Doda, Norihiro  

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 to assess repeatedly occurred multi-failures by volcano ash in volcanic eruption event. AM repetition of the filter exchange to recover the cooling function of the air coolers (ACs) of auxiliary cooling system (ACS) were considered. The uncertainty of AM measure was set as a parameter. The results showed that extending the endurance time of ACS-AC filter was effective as AM measure against volcanic ash hazard.