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日本原子力研究所トリチウムプロセス研究棟(TPL)におけるトリチウムの計量管理; 15年間の実績と研究開発

Accounting and control of tritium at the Tritium Process Laboratory (TPL) of JAERI; Results of 15-year operation and research activity

西 正孝; 山西 敏彦; 林 巧; 山田 正行; 鈴木 卓美

Nishi, Masataka; Yamanishi, Toshihiko; Hayashi, Takumi; Yamada, Masayuki; Suzuki, Takumi

原研トリチウムプロセス研究棟(TPL)では核融合炉の燃料プロセス技術及びトリチウム安全取扱技術の研究開発が進められてきた。TPLは1g(約0.36PBq)以上のトリチウムを取り扱うことの許可された国内唯一の施設であり、その運転管理自体が核融合炉施設の開発にとってトリチウム管理の観点から重要である。TPLでは1988年以来、22PBqまでのトリチウムを放射線障害防止法に則って取り扱い、種々の実験を安全に遂行してきた。さらに、TPLでは自主的なトリチウムの計量管理計画を立て、15年間の安全実績を通してその手法を確立した。また、核融合炉でのキログラム規模のトリチウム取扱に備えて計量管理方法の研究を進め、新技術を開発してきた。本報では、ITERのトリチウム燃料システムの工学設計に大きく貢献したこれらTPLの運転実績や研究開発及び今後の課題についてレビューする。

Research and development work of fuel processing technology and tritium safe-handling technology for fusion reactors has been performed at the Tritium Process Laboratory (TPL) of JAERI. The TPL is the first facility in Japan permitted to handle tritium of more than 1g (about 0.36PBq), and its operation itself is also important for the development of fusion reactor facility in the viewpoint of tritium control. Various experiments have been performed at the TPL safely since 1988 controlling 22PBq of tritium as the maximum observing regulations. In addition to the regulatory control, detailed independent control in the TPL was planned and was established through its 15-year safe-operation. For future fusion fuel facility where kilograms of tritium will be handled, method of tritium accounting has been researched and some new techniques have been developed at the TPL. The results of the TPL operation and of the research activity in it, which contributed the completion of the engineering design of the ITER, are summarized in this paper together with the subjects to be reserched.

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