Microstructural evolution and Am migration behavior in Am-containing MOX fuels at the initial stage of irradiation

照射初期のAm含有MOX燃料における組織変化及びAm再分布挙動

田中 康介  ; 三輪 周平  ; 佐藤 勇; 逢坂 正彦  ; 廣沢 孝志  ; 大林 弘 ; 小山 真一  ; 吉持 宏; 田中 健哉

Tanaka, Kosuke; Miwa, Shuhei; Sato, Isamu; Osaka, Masahiko; Hirosawa, Takashi; Obayashi, Hiroshi; Koyama, Shinichi; Yoshimochi, Hiroshi; Tanaka, Kenya

MOX燃料の照射挙動におよぼすAm添加の影響を確認するため、高速実験炉「常陽」において照射試験(Am-1)を実施している。Am-1は短期照射試験と定常照射試験からなり、短期照射試験は終了し、照射後試験を進めている。本報告では、10分間及び24時間照射したAm-MOX燃料ペレットの照射後試験結果について述べる。併せて、照射燃料試験施設(AGF)で実施してきた遠隔製造技術開発及び燃料特性評価結果についても紹介する。

In order to investigate the effect of americium addition to MOX fuels on the irradiation behavior, the "Am-1" program is being conducted in JAEA. The Am-1 program consists of two short-term irradiation tests of 10-minute and 24-hour irradiations and a steady-state irradiation test. The short-term irradiation tests were successfully completed and the post irradiation examinations (PIEs) are in progress. The PIEs for Am-containing MOX fuels focused on the microstructural evolution and redistribution behavior of Am at the initial stage of irradiation and the results to date are reported. Successful development of fabrication technology with remote handling and evaluation of thermo-chemical properties based on the out-of-pile experiments are described with an emphasis on the effects of Am addition on the MOX fuel properties.