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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; 原因調査及び輸送作業

Investigation on cause of outage of Wide Range Monitor (WRM) in High Temperature engineering Test Reactor (HTTR); Transport operation toward investigation for cause of outage

篠原 正憲; 澤畑 洋明; 川本 大樹; 茂木 利広; 齋藤 賢司; 高田 昌二; 吉田 直昭; 磯崎 涼佑; 勝山 幸三

Shinohara, Masanori; Sawahata, Hiroaki; Kawamoto, Taiki; Motegi, Toshihiro; Saito, Kenji; Takada, Shoji; Yoshida, Naoaki; Isozaki, Ryosuke; 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の寿命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、照射燃料集合体試験施設(FMF)にてX線CT装置を用いた照射後試験を計画した。本報告書は、WRM動作不能の原因調査、当該WRMのFMFへの輸送方法の検討及び輸送作業の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 developed life is one of the issues to develop the technology basis of High Temperature Gas cooled Reactor (HTGR). Then, a post irradiation examination was planned to specify the damaged part causing the event in the WRM was also planned. For the investigation, the X-ray computed tomography scanner in Fuels Monitoring Facility (FMF). This report describes the preliminary investigation on the cause of outage of the WRM. The results of study for transportation method of the irradiated WRM from HTTR to FMF is also reported with the record to complete the transport operation.

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