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ナトリウム冷却高速炉の温度成層化現象に関する実験研究,2; DHX温度差及び出口流量が温度成層界面に与える影響評価

Experimental study on thermal stratification phenomena in Sodium-cooled Fast Reactor, 2; Influence evaluation which a temperature difference and a flow of DHX outlet give to a thermal stratification interface

萩原 裕之; 木村 暢之*; 長澤 一嘉*; 小野島 貴光; 上出 英樹 ; 田中 正暁  

Hagiwara, Hiroyuki; Kimura, Nobuyuki*; Nagasawa, Kazuyoshi*; Onojima, Takamitsu; Kamide, Hideki; Tanaka, Masaaki

ナトリウム冷却高速炉のスクラム過渡時温度成層化現象に関して、1/11縮尺炉上部プレナム水流動試験装置を用い、自然循環時のDHXの運転条件を変更した場合のDHX下部で発生する温度成層化界面への影響を調べた。その結果、スクラム後の炉心出口とDHX出口の温度差及びDHX出口流速が小さい条件ほど、温度勾配が小さくなることが分かった。

Influence of DHX operating conditions in natural circulation on thermal stratification surface occurring under DHX was studied by using 1/11 scale upper plenum water test for Japan Sodium-cooled Fast Reactor. As the result, it was found that temperature difference between fuel subassembly outlet after scrum and DHX outlet became smaller or DHX outlet velocity became lower, temperature gradient decreased.

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