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基礎架台コンクリート等への放射性物質等の浸透性調査

Study on radioactive substance osmosis for basis concrete of equipment

水井 宏之; 伊藤 英樹*; 久米 恭*; 小川 秀夫*; 金田 由久*

Mizui, Hiroyuki; Ito, Hideki*; Kume, Kyo*; Ogawa, Hideo*; Kaneda, Yoshihisa*

「ふげん」の解体撤去工事等に伴い撤去する基礎架台コンクリート等の処理・処分に向けた事前検討の一環として、放射性物質等の浸透性を調査した。本調査では、非放射性コバルト溶液のコンクリート中への浸透範囲をPIXE等により観察し、ひび割れの深さは超音波法等により測定した。調査の結果、コンクリートのひび割れ箇所に接液すれば、ひび割れ深さ程度までは浸透する挙動を確認した。ただし、表面に塗膜がある場合には短期間では浸透しなかった。また、浸透範囲はひび割れ深さと概ね相関傾向にあることを確認した。今後、同様の評価を継続し、浸透汚染が必ずしも否定できない範囲を評価する手法の構築を目指す予定である。

Radioactive substance osmosis for basis concrete of equipment was estimated, to treat and dispose in decommissioning project of Fugen Decommissioning Engineering Center (Fugen). In this study, the osmosis of Cobalt (non-radioactive) in liquid to concrete was observed by using PIXE method and others. And, the crack depth was measured by using UT method and others. As a result, it was confirmed that radioactive substance was osmosed to depth of crack, if Cobalt in liquid was touched with the crack of concrete, but the hydrophobic coatings of surface protect the liquid osmosis in short time. And, the relationship between crack depth and liquid osmosis was observed as nearly correlation. The continuous study at Fugen will establish the estimation method for area of osmosis contamination possibilities for basis concrete of equipment in the near future.

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