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東海再処理施設から海洋放出されたトリチウムの海水中濃度及び拡散状況

Tritium concentration and diffusion in seawater discharged from Tokai reprocessing plant

中野 政尚; 國分 祐司; 武石 稔

Nakano, Masanao; Kokubun, Yuji; Takeishi, Minoru

1978年から30年間に渡る東海再処理施設周辺海域の環境影響詳細調査によって10,800件の海水中トリチウム濃度を測定した。海水中濃度,希釈倍率,拡散状況等について検討した。その結果、再処理施設からの排水放出に起因するトリチウム濃度がスポット的に観測されたが、あらかじめ安全審査で評価された希釈倍率以上に希釈された正常な拡散であり、またその濃度は法令に定める周辺監視区域外の水中の濃度限度に比べて十分に低く、環境安全上問題となるレベルではないことが確認された。

The tritium concentrations in seawater collected around the Tokai Reprocessing Plant (TRP) were measured for 10,800 samples in 30 years from 1978. The tritium concentration, dillution factor and diffusion situation were investigated. As a result, the tritium was occationaly detected due to the discharge from TRP. But it was considered to be the result of normal diffusion assumed in the safety assessment. It was confirmed that the tritium concentration was much lower than the concentration limit defined in the law and that it was not concern of environmental safety.

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