Reliability enhancement of seismic risk assessment of NPP as risk management fundamentals, 6; Code development and application

Muramatsu, Ken*; Uchiyama, Tomoaki*; Muta, Hitoshi*; Nishida, Akemi  

In this research project, study on probabilistic models and treatment of epistemic uncertainty, study on quantification of epistemic uncertainty on fragility assessment and verification of usefulness of proposed method are performed for reliability enhancement of seismic risk assessment. We are performing examination to treat the epistemic uncertainty in the analysis by using SECOM2-DQFM code developed by JAEA. Development of the program is now performed considered about uncertainty analysis method based on Direct Quantification of Fault Tree using Monte Carlo Simulation (DQFM) method. In this report, parallelization of the SECOM2-DQFM code, improvement to enhance the uncertainty analysis function, and the result of a trial analysis to target the BWR will be explained.