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Development of a simulation code for a cool-down process of the cryogenic hydrogen system

低温水素システム冷却プロセス解析コードの開発

達本 衡輝; 麻生 智一; 大都 起一; 加藤 崇; 二川 正敏

Tatsumoto, Hideki; Aso, Tomokazu; Otsu, Kiichi; Kato, Takashi; Futakawa, Masatoshi

J-PARCの核破砕中性子源ではMW級の陽子ビームによる核破砕反応によって発生した高速中性子を超臨界圧水素を用いて冷中性子に減速しビームを供給する。陽子ビーム1MW時において、水素モデレータ容器内で発生する核発熱は約3.8kWであり、この大きな熱負荷を除去するために、大流量の超臨界圧水素を安定に強制循環させる低温システムを製作した。本システムの冷却運転方法の確立を目指して、冷却プロセスを模擬する流体解析コードを開発し、種々の条件下における冷却プロセス解析を行い、最適な条件を見いだすことができ、19時間以内で定格状態まで冷却可能であることがわかった。

Supercritical hydrogen with a pressure of 1.5 MPa and a temperature of 20 K has been selected as a moderator material in an intense spallation neutron source (JSNS), which is one of main experimental facilities in J-PARC. The cryogenic hydrogen system, in which a hydrogen circulation system is cooled by a helium refrigerator with the refrigeration power of 6.45 kW at 15.5 K, has been designed to provide the supercritical hydrogen to the moderator and to remove the nuclear heating generated there. In this study, we have developed a simulation code that predicts temperature behaviors in the hydrogen circulation system during its cool-down process. A cool-down process analyses have been performed, and an operational method for the cool-down process has been studied. The analytical results indicate that the hydrogen circulation system would be able to be cooled down to 18 K within 19 hours.

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