Core design of the next-generation sodium-cooled fast reactor in Japan

我が国の次世代ナトリウム冷却高速炉の炉心設計

菅 太郎*; 小倉 理志*; 日比 宏基*; 大木 繁夫 ; 前田 誠一郎 ; 丸山 修平   ; 大釜 和也   

Kan, Taro*; Ogura, Masashi*; Hibi, Koki*; Oki, Shigeo; Maeda, Seiichiro; Maruyama, Shuhei; Ohgama, Kazuya

In Japan, a 1500MWe-scale sodium-cooled fastreactor (FR) has been designed as a commercial phaseFR for utilizing in an equilibrium FR operation era, and a 750MWe-scale FR has been as a demonstration phase FRfor realizing the commercial phase FR. Thedemonstration phase core adopts a core and a blanketfuel subassembly with the same specifications of thecommercial phase core, and is designed to satisfy designrequirements, especially to accept a broad range of fuelcompositions, which arises in a transition period from anLWR are to an FR era. By optimizing an arrangement offuel subassemblies and control rods, and employing a fluxadjuster, the demonstration phase core gets flat powerdistribution giving high core performances. And its coreand fuel specifications are materialized to satisfy thedesign requirements desired for the next-generation FR.