低減速スペクトル炉の設計研究

Design study on Reduced-Moderation Water Reactor (RMWR)

大久保 努; 岩村 公道; 山本 一彦*; 岡田 祐之*

Okubo, Tsutomu; Iwamura, Takamichi; Yamamoto, Kazuhiko*; Okada, Hiroyuki*

これまで培われてきた軽水炉技術をベースとしつつ、1を越える高転換比の達成が可能な水冷却炉である低減速スペクトル炉の概念設計研究を進めている。これまでに1以上の高転換比と負のボイド反応度係数を達成可能な炉心概念を構築するとともに、炉心性能の向上に加え、プルトニウム多重リサイクル性の検討や制御棒計画の立案等の炉心概念の詳細な検討を進めて来た。その結果、低除染再処理を想定した多重リサイクルが可能であることや、超扁平二重炉心に対しても、炉心各部の出力を安全に制御することが可能であることを確認した。

Based on the experienced light water reactor technology, conceptual design studies on advanced water-cooled reactors have been performed. They are named “Reduced-Moderation Water Reactor" (RMWR) with the high conversion ratio more than 1.0 and the negative void reactivity coefficients. Several concepts have been successfully established for them based on the neutronics calculations. Based on these concepts, detailed investigations on such as plutonium multiple recycling and control rod planning have been performed as well as improvement on core performances. Through these detailed core design investigation, the feasibility of those designs has been confirmed step by step.