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プラント動特性解析コードSuper-COPDを用いた自然循環時炉心内熱流動解析,2; 燃料集合体間熱移行モデルの適用性評価

Analysis of core thermal hydraulics under natural circulation condition with plant dynamics analysis code Super-COPD, 2; Applicability evaluation of the inter-subassembly heat transfer model

浜瀬 枝里菜 ; 堂田 哲広  ; 鍋島 邦彦  ; 小野 綾子 ; 大島 宏之

Hamase, Erina; Doda, Norihiro; Nabeshima, Kunihiko; Ono, Ayako; Ohshima, Hiroyuki

高速炉における自然循環崩壊熱除去時の燃料集合体間熱移行現象に対するプラント動特性解析コード(Super-COPD)の適用性を確認するため、ナトリウム試験装置(PLANDTL)を用いた隣接集合体間に有意な温度差がつく条件での自然循環相当流量定常試験を対象として解析を実施した。温度差条件を変えた2ケースにおいて、隣接する集合体3体全ての集合体内冷却材温度分布が試験結果とよく一致した。これにより燃料集合体間熱移行現象に対するSuper-COPDの適用性を確認した。

In order to validate the plant dynamic analysis code Super-COPD for inter-subassembly heat transfer in the core, the analyses that simulate the steady-state experiments with the plant dynamic test loop (PLANDTL) in the low flow conditions corresponding to natural circulation have been carried. The two test cases that have a significant temperature difference between adjacent subassemblies were simulated. In both cases, the simulated sodium temperature distributions in subassemblies had good agreement with experimental results. It was found that the Super-COPD could evaluate the inter-subassembly heat transfer in the core.

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