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Fuel cycle design evolution from FDR-ITER to RTO/RC-ITER

D.K Murdoch, M Glugla, O Kveton2000年Fusion Engineering and DesignIF 1.7出版社

AbstractInstantaneous fuelling and plasma exhaust flow rates for the reduced technical objective/reduced cost version of International Thermonuclear Experimental Reactor (RTO/RC-ITER) are similar to those described in the Final Design Report (FDR) of ITER, despite the reduction in fusion power by a factor of about two. However, the reduced pulse length and the lower fraction of campaign time spent in burn mode, together with the lower integrated operating lifetime proposed, will generate cost savings in several systems of the fuel cycle. As the quantity of tritium handled per pulse is now smaller, this could be buffered, allowing systems in the tritium plant still to operate in steady state mode as in the FDR design, thereby increasing the potential for downsizing of system capacities. The lower operating time fraction will increase performance margins for some systems, for example, the Torus Exhaust Gas Processing System (TEGPS) which was designed to meet a specified daily release rate for the FDR design conditions which were more onerous than RTO/RC-ITER. As no break through of tritium into cooling water is now expected, the duties of the Water and Atmosphere Detritiation Systems are considerably reduced, and design concepts which are simpler, cheaper and more amenable to modular implementation can be adopted.

日本語訳

即時燃料供給および排気流量は、国際熱核融合実験炉(ITER)の低技術目標・低コスト版(RTO/RC-ITER)において、ITERの最終設計報告書(FDR)に記載されたものと同様である。ただし、核融合出力が約2倍に削減されるにもかかわらず、この点は変わらない。しかしながら、パルス長の短縮、燃焼時間がキャンペーン全体に占める割合の低下、さらに統合運転寿命の短縮により、燃料サイクルのいくつかのシステムにおいてコスト削減がもたらされる。1パルスあたりに取り扱うトリチウム量が減少したため、これをバッファリングすることが可能となり、トリチウムプラントのシステムはFDR設計と同様に定常状態モードで運転を継続でき、それによってシステム容量の縮小化の可能性が高まる。運転時間の割合が低下することで、一部のシステムでは性能マージンが拡大する。例えば、トーラス排気ガス処理システム(TEGPS)は、FDR設計時よりも厳しい条件下で、指定された日間放出率を満たすように設計されていたが、RTO/RC-ITERではその負荷が軽減される。さらに、冷却水へのトリチウム漏洩がもはや想定されないため、水・大気浄化システム(Water and Atmosphere Detritiation Systems)の負荷は大幅に低減され、より簡素で低コスト、かつモジュール化が容易な設計概念を採用することが可能となる。

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