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Numerical investigation of thermal striping near core instruments plate around control rod channels in JSFR

ナトリウム冷却大型炉の炉上部機構下面におけるサーマルストライピング現象の数値解析

田中 正暁  ; 大島 宏之; 村上 諭*

Tanaka, Masaaki; Ohshima, Hiroyuki; Murakami, Satoshi*

ナトリウム冷却大型炉の炉上部機構下面におけるサーマルストライピング現象を対象として、制御棒チャンネル周辺の局所熱流動現象に着目した局所解析モデルを構築し、現象把握と影響緩和方策を適用した結果について報告する。

This paper deals with numerical simulations focusing on several areas around typical CR channels in order to reveal thermal mixing phenomena and to confirm effect of mitigation measures to the thermal striping phenomena around the CR channel. By the numerical simulation, generation mechanism of influential temperature fluctuation on the CIP integrity is revealed and effect of mitigation measure based on the mixing mechanism is confirmed.

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