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

ナトリウム冷却高速炉の崩壊熱除去に関わる数値解析の妥当性確認における結果の差の定量化に係る研究

田中 正暁  ; 三宅 康洋*; 江連 俊樹 ; 浜瀬 枝里菜 

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

浸漬型直接冷却器(D-DHX)を用いた崩壊熱除去時に生じる炉心プレナム相互作用時の炉心熱流動を評価できる設計検討用の数値流体力学コードを用いた数値解析モデルの開発を行っている。ナトリウム試験装置PLANDTL-2での試験結果を用いた妥当性確認での妥当性を判断するため、AVM法及びその修正方法を用い、解析と実験結果との差を定量的に計測することを試み、これら手法の適用性を確認することができた。

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.

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