Tritium Concentration and Diffusion in Seawater Discharged from Tokai Reprocessing Plant

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  • NAKANO Masanao
    Radiation Protection Depertment, Nuclear Fuel Cycle Enginneering Laboratories, Tokai Research and Development Center, Japan Atomic Energy Agency
  • KOKUBUN Yuji
    Radiation Protection Depertment, Nuclear Fuel Cycle Enginneering Laboratories, Tokai Research and Development Center, Japan Atomic Energy Agency
  • TAKEISHI Minoru
    Radiation Protection Depertment, Nuclear Fuel Cycle Enginneering Laboratories, Tokai Research and Development Center, Japan Atomic Energy Agency

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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
  • トウカイ サイショリ シセツ カラ カイヨウ ホウシュツ サレタ トリチウム ノ カイスイチュウ ノウド オヨビ カクサン ジョウキョウ

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Description

The tritium concentrations in seawater collected around the Tokai Reprpcessing 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 expected 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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