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JET exhaust detritiation system replacement—design, commissioning, and operation

Robert George, David Kennedy, Tim Huddleston, Aarthee Vittal, Ryan Morris, Simon Ng, Xavier Lefebvre, JET Contributors2023年Plasma Physics and Controlled FusionIF 2.2出版社

The exhaust detritiation system (EDS) of the Joint European Torus (JET) active gas handling system removes tritium from exhaust gases and contaminated air prior to discharge to stack. The system was replaced prior to JET's tritium experimental campaign due to corrosion damage. In this paper, the following topics are presented: system function and description, corrosion and failure of the previous EDS, enhancements for the replacement EDS including testing of acid passivation column, commissioning experience, operating experience and performance. Acids including hydrofluoric were generated in catalytic recombiners following inadvertent halogen ingress. Pitting corrosion was identified with breakthrough failure of condensate pipework. To mitigate a recurrence, a novel acid passivation sub-system was designed. The acid passivation testing demonstrated successful performance of the design and calcium-hydroxide passivation packing tested, with acids below the limit of detectability at the test column outlet. Issues encountered during commissioning are described and key performance metrics such as detritiation factor reported. Finally, operational issues and system performance is presented.

日本語訳

JET(共同欧州トーラス)活性ガス処理システムの排気トリチウム除去システム(EDS)は、排気ガスおよびスタックへの放出前の汚染空気からトリチウムを除去する。本システムは、腐食損傷のため、JETのトリチウム実験キャンペーン前に交換された。本論文では、以下の項目について述べる:システムの機能と説明、従来のEDSの腐食と故障、酸パッシベーションの試験を含む交換用EDSの改良、試運転経験、運転経験および性能。フッ化水素酸を含む酸は、不注意によるハロゲンの侵入後、接触式再結合器内で生成された。孔食は、凝縮液配管の破断を伴って確認された。再発を軽減するため、新規の酸パッシベーションサブシステムが設計された。酸パッシベーション試験は、設計の成功を実証し、水酸化カルシウムパッシベーションパッキングは、試験カラム出口において検出限界未満の酸濃度を示した。試運転中に発生した問題について説明し、除染係数などの主要な性能指標を報告する。最後に、運転上の問題とシステム性能について述べる。

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