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鉛ビスマスからのアルカリ元素不純物の蒸発挙動

Impurity evaporation behavior of alkali elements from lead-bismuth eutectic

山田 結也*; 藤原 卓真*; 宮原 信哉* ; 有田 裕二*; 佐々 敏信  ; 武井 早憲 ; 前川 藤夫 ; 大林 寛生 ; 中野 敬太  

Yamada, Yuya*; Fujiwara, Takuma*; Miyahara, Shinya*; Arita, Yuji*; Sasa, Toshinobu; Takei, Hayanori; Maekawa, Fujio; Obayashi, Hironari; Nakano, Keita

加速器駆動システム(ADS)では、核破砕中性子ターゲット材および冷却材として鉛ビスマス共晶(LBE)を使用する。陽子ビームによる核破砕反応により、LBE中に様々な放射性核破砕生成物(SP)が生成し、LBEが放射化する。このため、通常運転や事故時の放射線障害の観点から、LBEからカバーガス中などへの核破砕生成物の放出と輸送挙動を把握することが重要である。今回、アルカリ金属元素の中で生成量が多いCs及びRbがLBEから蒸発する挙動を把握するため、Knudsen流出質量分析装置を用いて、それらの蒸発する化学種や蒸気圧を測定した。その結果CsやRbはLBE中から揮発しやすいことがわかった。

Lead-Bismuth Eutectic (LBE) is a candidate material as a neutron generation target and a coolant in an Accelerator Driven System (ADS) proposed by Japan Atomic Energy Agency (JAEA). In the LBE of ADS, a large amount of radioactive materials is produced as spallation product (SP) via spallation reactions between a proton beam and the LBE. As the results, the LBE is highly activated due to the radioactive SPs. It is important to evaluate the release and transport behavior of the SPs from the LBE coolant to the cover gas from the viewpoints of the radiological hazard both in the cases of normal operation and accident. In the present study, in order to understand the evaporation behavior of Cs and Rb, which are produced in large amounts among alkaline metal elements, from the LBE, the chemical species and vapor pressures were measured using a Knudsen effusion mass spectrometer (KEMS). As the results, Cs and Rb were found to be easily evaporated than LBE.

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