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Influence of hydrogen trapping on WCLL breeding blanket performances

James Dark, Remi Delaporte-Mathurin, Yann Charles, Etienne A. Hodille, Christian Grisolia, Jonathan Mougenot2021年被引用 4Nuclear FusionIF 3出版社

Tritium transport simulations in water-cooled lithium lead (WCLL) breeding blankets have been performed with FESTIM. Fluid dynamics and heat transfer were coupled to evaluate how temperature and LiPb velocity fields affect tritium transport. The 2D WCLL model consisted of tungsten, EUROFER and liquid LiPb. Tritium inventories and permeation fluxes have been computed and the influence of trapping effects in solid domains was highlighted. It was evaluated that inclusion of trapping mechanisms increases inventory values by 15% and delays permeation to the cooling channels. A parametric study was conducted to investigate the impact of the uncertainty in the literature (2 orders of magnitude) regarding hydrogen solubility in LiPb on these quantities. Varying the lithium lead solubility over the range found in the literature was found to vary the EUROFER inventory by a factor of 25. Permeation fluxes to the coolant channels was found to vary over a factor of 3.

日本語訳

水冷リチウム鉛(WCLL)増殖ブランケットにおけるトリチウム輸送シミュレーションをFESTIMを用いて実施した。流体力学と熱伝達を連成させ、温度およびLiPb速度場がトリチウム輸送に及ぼす影響を評価した。2次元WCLLモデルは、タングステン、EUROFER、液体LiPbで構成した。トリチウムインベントリと透過フラックスを計算し、固体領域におけるトラップ効果の影響を明らかにした。トラップ機構を含めることで、インベントリ値が15%増加し、冷却チャネルへの透過が遅延することが評価された。LiPb中への水素溶解度に関する文献上の不確実性(2桁)がこれらの量に及ぼす影響を調査するため、パラメトリック研究を実施した。文献で見られる範囲でリチウム鉛溶解度を変化させると、EUROFERインベントリが25倍変動することが判明した。冷却材チャネルへの透過フラックスは3倍の範囲で変動することが判明した。

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Breeding blanketWater-cooled lead-lithium
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