Study on reliability enhancement of seismic risk assessment of NPP, 2; Core damage frequency calculation method and improvement of SECOM-2 code

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

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, the uncertainty analysis method will be explained.