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JMTRコンクリート構造物の健全性調査

Investigation on integrity of JMTR concrete structure

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

Miyauchi, Masaru; Kimura, Tadashi; Oto, Tsutomu; 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コンクリート構造物(排気筒,トレンチ,カナル室壁,フィルタバンク廻り)について健全性調査を実施した。健全性調査では、コンクリートの表面劣化,反発度(非破壊強度推定),コア供試体による圧縮強度,静弾性係数,中性化深さ,鉄筋腐食,塩分含有量について、それぞれ調査を行い健全性が十分維持されていることを確認した。その後、調査結果をもとに排気筒とトレンチについて、塗装の剥離等の劣化の進行抑制の観点から、再塗装などの補修を実施した。コンクリート構造物の今後の継続的使用にあたっては、これまで実施してきた建家外表面の塗装を含む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。

An integrity investigation was carried out for the JMTR Concrete Structure (Vent Stack, Trench, Canal Building, Filter Bank), which was the concrete structure and would be used for the long-term after JMTR restart, before the repair or replacement work of the JMTR related facilities that had begun in FY2007. In the integrity investigation, the concrete surface deterioration, the rebound number (nondestructive strength test), compressive strength using drilled concrete core test piece, the static modules of elasticity, the carbonation depth, the reinforced bar corrosion and the chloride ion content were investigated respectively and the integrity of concrete was confirmed. After the investigation, repair works such as re-painting of the Vent Stack and Trench were carried out from the viewpoint of prevention of flaking off, floating of the painting and the thinning due to the investigation results. In order to use the JMTR concrete structure continuously for long-term, it is important for maintaining the integrity of a concrete structure by the periodical maintenance and the repairing work including the building outer-wall surface painting that has been conducted up to now.

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