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50MW蒸気発生器試験施設における水リーク検出システム評価試験(第10報); 水リーク模擬試験・水リーク警報システム

Experiments on the water leak detection system in the 50MW steam generator test facility (10); Water leak simulation test $$cdot$$ Water leak alarm system

白土 清一*; 金子 義久*; 錦見 正和*; 森本 誠*; 松本 重治*; 本永 哲司*; 今井 熙*; 福田 達

Shirato, Seiichi*; Kaneko, Yoshihisa*; Nishikimi, Masakazu*; Morimoto, Makoto*; Matsumoto, Shigeharu*; Motonaga, Tsutsuji*; Imai, Hiroshi*; Fukuda, Toru

高速増殖炉の蒸気発生器における小リーク・ナトリウム-水反応検出システムを開発するため,50MW蒸気発生器試験施設を用いて一連の水リーク検出システム評価試験が実施されている。本報は過熱器出口ナトリウム配管への注水素および,注水試験ならび蒸発器本体内への注水素試験に関する試験計画,試験装置,水素計・酸素計の応答,水素・酸素の検出割合ならびに水リーク警報システムについて報告する。おもな内容は以下のとおりである。1)過熱器出口ナトリウム配管への注水素および,注水試験を実施し.二次系内の水素・酸素挙動を把握した。蒸発器本体内のアニュラス部,ダウンカマ部,カバーガス部への注水素試験を実施し.系内の水素挙動を把握した。注水素,注水試験における水素検出割台を整理し,その値に影響する因子を評価した。また系内の水素輪送時間について評価した。4)過熱器出口ナトリウム配管部の注水素と注水試験および蒸発器本体内の注水素試験を比較し,蒸発器本体内の水リーク時の水素検出割合を評価した。計算機による水リーク警報システムを作成し,その有効性を確認した。

To develop the small leak sodium-water reaction detection system in the steam generator for Fast Breeder Reactor, the series studies on system evaluation tests have been carried out at the 50MW Steam Generator Test Facility. This report deals with hydrogen and injection tests into the sodium outlet pipe from the superheater, test plans and test equipments for hydrogen injection tests into the evaporator, the response performances for the hydrogen meter and oxygen meter, detection ratio for hydrogen and oxygen and the water leak alarm system etc. The test results are summarized as follows: (1)Hydrogen injection tests & water injection tests into the sodium outlet pipe from the superheater were done and the hydrogen & oxygen behaviors were understood. (2)Hydrogen injection tests at the annulus, down-comer and cover-gas region in the evaporator were done and hydrogen behaviors were understood. (3)Hydrogen detection rates depending on hydrogen injection tests & water injection tests were arranged and factors giving the effect on the rate were evaluated. Also, hydrogen transfer times were evaluated. (4)Hydrogen detection rates at the water leakage in the evaporator were evaluated by the comparison of hydrogen injection test results & water injection test results into the sodium out1et pipe from the superheater and hydrogen injection test results into the evaporator. (5)The water leak alarm system by the computor was completed and the validity was confirmed.

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