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Experimental study on boiling accident of high active liquid waste in reprocessing

再処理高レベル廃液沸騰事故に関する実験研究

内山 軍蔵; 田代 信介; 天野 祐希; 阿部 仁; 山根 祐一; 吉田 一雄; 石川 淳

Uchiyama, Gunzo; Tashiro, Shinsuke; Amano, Yuki; Abe, Hitoshi; Yamane, Yuichi; Yoshida, Kazuo; Ishikawa, Jun

再処理施設高レベル廃液の沸騰事故時における放射性物質の放出量評価データ取得に関する実験研究を行っている。本研究では、コールド基礎実験、コールド工学実験及びホット実験を行っている。これまでの実験の結果、高レベル模擬廃液の沸騰事故条件ではRu及びTcは揮発性を有し、ガス状及びミスト状で放出され、その他のFP元素は非揮発性であり、ミスト状で放出されることがわかった。高レベル摸擬廃液からの非揮発性FP元素の放出率は、10$$^{-4}$$程度であった。Amなどのアクチニド元素の放出率は、非揮発性FP元素とほぼ同程度であった。

The experimental study for source term data of radioactive materials has been conducted at a boiling accident of high active liquid waste (HALW) in reprocessing plants. In the study, three kinds of tests have been conducted including a cold small scale test, a cold engineering scale test and a hot small scale test. The following results were obtained: Ruthenium and Technetium were released into the gas phase in the form of both mist and gas under the boiling accident conditions of a simulated HALW. Non-volatile fission products (FPs) such as Nd and Cs were released into the gas phase in the form of mist. The release ratios of non-volatile FPs from a vessel of the simulated HALW were about 10$$^{-4}$$. The release ratios of actinide nuclides such as Am were almost the same as those of non-volatile FPs.

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