R&D of validity evaluation system for seismic simulation of entire nuclear plant

Suzuki, Yoshio   ; Miyamura, Hiroko  ; Nakajima, Norihiro  

To estimate real behavior accurately by numerical simulations, it is indispensable to evaluate validity of simulation results because numerical simulations include various uncertainties such as "uncertainty due to randomness" and "uncertainty due to lack of knowledge". As one of approaches to evaluate validity of simulation results, we introduce "the degree of certainty" of simulations to real behavior. Here, to get a more accurate degree of certainty, we try to confirm the degree of influence about unevenness of uncertainty and to reduce uncertainty due to lack of knowledge. For this, we research and develop a validity evaluation system composed of three tools. We have applied them to our seismic simulation system which enables to execute the assembly structure analysis of an entire nuclear plant and confirmed that their functions are applicable to the simulation.