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高温工学試験研究炉(HTTR)の使用済広領域中性子検出器の動作不能調査; 原因調査及び照射後試験

Investigation on cause of outage of Wide Range Monitor (WRM) in High Temperature engineering Test Reactor (HTTR); Post Irradiation Examination (PIE) toward investigation of the cause

篠原 正憲; 茂木 利広; 齋藤 賢司; 高田 昌二; 石見 明洋; 勝山 幸三

Shinohara, Masanori; Motegi, Toshihiro; Saito, Kenji; Takada, Shoji; Ishimi, Akihiro; Katsuyama, Kozo

2010年3月の原子炉停止中に、広領域中性子検出器(WRM)が開発時の動作実績期間より短い使用時間で動作不能となる事象が発生した。本事象の原因調査を行い、WRMの使用期間を向上させることは高温ガス炉の基盤技術開発において重要である。そこで、事象発生部位の特定及び破損原因を調査するため、製作メーカにてWRM模擬試験体を製作し、短絡状態を模擬した特性インピーダンス波形測定並びに照射燃料集合体試験施設(FMF)にて高エネルギーX線CT検査装置を用いた照射後試験(PIE)を実施した。本報告書は、WRMの動作不能の原因調査及びPIE結果をまとめたものである。

An event, in which one of WRMs were disabled to detect the neutron flux in the reactor core, occurred during the period of reactor shut down of HTTR in March, 2010. The actual life time of WRM was unexpectedly shorter than the past developed life time. Investigation of the cause of the outage of WRM toward the recovery of the life time up to the past developed life is one of the issues to develop the technology basis of HTGR. Then, two experimental investigations were carried out to reveal the cause of the outage by specifying the damaged part causing the event in the WRM. The one is a post irradiation examination using the X-ray computed tomography scanner in Fuels Monitoring Facility (FMF) to specify the damaged part in the WRM. The other is an experiment using a mock-up simulating the WRM fabricated by the fabricator. This report summarized the results of the PIE and the experimental investigation using the mock-up to reveal the cause of outage of WRM.

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