Study on measurement method of degree of difference in validation of numerical analysis for decay heat removal in sodium-cooled fast reactor

Tanaka, Masaaki  ; Miyake, Yasuhiro*; Ezure, Toshiki ; Hamase, Erina 

The numerical analysis model for the computational fluid dynamics (CFD) code for the design study is developed to evaluate the thermal-hydraulics in the core under the core-plenum interaction (CPI) during the decay heat removal using the dipped type direct heat exchanger (D-DHX). To judge the adequacy of the numerical results for a validation study with the sodium experiment results conducted at PLANDTL-2 facility, the degree of difference (DoD) between the numerical and experimental results must be measured by using the area validation metrics (AVM). Through the examinations, the applicability of the AVM and MAVM based on the p-box method was confirmed.