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JMTR UCL高架水槽基礎部の健全性調査

Investigation on integrity of JMTR UCL elevated water tank

木村 正; 大戸 勤; 宮内 優; 根本 宣昭; 飛田 健治; 深作 秋富; 高橋 邦裕

Kimura, Tadashi; Oto, Tsutomu; Miyauchi, Masaru; Nemoto, Nobuaki; Tobita, Kenji; Fukasaku, Akitomi; Takahashi, Kunihiro

2007年度から開始したJMTR原子炉施設の改修工事に先立ち、JMTR再稼働後も長期的に使用するUCL高架水槽の健全性を評価するため、基礎部について経年劣化の著しい位置を選定して調査を実施した。健全性調査では、基礎ボルトについては劣化の進行している箇所があること、ベースプレート,胴部側板については一部減肉が見られるものの、溶接接合部には特に異常がないことを確認した。その後、調査結果をもとにUCL高架水槽全体について、美観及び塗装の剥離,腐食による減肉等の劣化の進行抑制の観点から、再塗装等の補修を実施した。UCL高架水槽の今後の継続的使用にあたっては、基礎部の定期的な点検及び補修を計画的に実施することが、健全性を維持するうえで重要である。

In order to investigate an integrity of the UCL (Utility Cooling Line) elevated water tank to be used for a long term after the JMTR restart, investigation on the base of the UCL elevated tank, especially for the part which had a significant aged effect, was carried out before the refurbishment work of the JMTR related facilities which had begun in FY2007. In the integrity investigation, it was confirmed that some part of the base bolts had significant aged effects, there were no evidence of crack and false indication in the welding region though thinning were observed in some parts of the base plate and the surrounding plate. After the investigation, repair works such as re-painting of the UCL elevated water tank were carried out from the viewpoint of prevention of flaking off, floating of the painting and the thinning due to corrosion based on the investigation results. In order to maintain the integrity of the UCL elevated tank, the periodical maintenance and the repair works of the base of the UCL elevated tank are important for continuous use of it in future.

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