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Tagging-gas failed fuel detection and location system for sodium-cooled large reactors

ナトリウム冷却大型炉に対するタグガス破損燃料位置検出

相澤 康介 ; 近澤 佳隆 

Aizawa, Kosuke; Chikazawa, Yoshitaka

ナトリウム冷却大型炉(JSFR)の破損燃料位置検出はセレクタバルブ法がレファレンスとして採用されている。本検討では代替案としてタグガス法の適用性について評価を行った。特にJSFRの炉心燃料が高燃焼度であることに着目し燃焼期間中の組成変化を考慮してもタグガスによる破損燃料同定が可能であることを確認した。

Failed fuel detection for an advanced loop-type sodium-cooled fast reactor has been studied as a conceptual design study of Japan Sodium cooled Fast Reactor (JSFR). A present JSFR design adopts a Selector-Valve (SV) failed fuel detection and location (FFDL) system. In this study, a Tagging-gas (Tag) FFDL system has been investigated as an alternative. One of major issues of the Tag-FFDL is isotope ratio change of tagging gas due to irradiation. It is expected that the isotope ratio change due to irradiation becomes larger than conventional ones, since JSFR adopts high burnup fuel. To identify a failed fuel subassembly, proper isotope content for JSFR tagging gas has been investigated. Tag gas isotope change in the JSFR condition has been evaluated regarding transmutation and fission gas release. In addition, an allowable background concentration of natural Kr and Xe in the cover gas has been evaluated.

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分野:Nuclear Science & Technology

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