Behavior of restructuring and redistribution of actinides on 3% and 5% Am-containing MOX fuels at the initial stage of irradiation

短期照射3%及び5%Am含有MOX燃料の組織変化及び再分布挙動

田中 康介  ; 三輪 周平  ; 関根 伸一; 吉持 宏; 大林 弘 ; 小山 真一  

Tanaka, Kosuke; Miwa, Shuhei; Sekine, Shinichi; Yoshimochi, Hiroshi; Obayashi, Hiroshi; Koyama, Shinichi

高速実験炉「常陽」で短期照射されたマイナーアクチニド(MA)含有MOX燃料のうちAmを約3%及び5%含有したMOX燃料(Am-MOX燃料)において燃料組織観察及びEPMA分析を実施し、ペレット径方向のAm再分布挙動に及ぼすO/M比の影響を調査した。

In order to confirm the effect of minor actinide addition on irradiation behavior of MOX fuel pellets, americium-containing MOX (Am-MOX) fuels containing 3% and 5% Am were irradiated for 10 minutes at 43 kW/m and for 24 hours at 45 kW/m in the experimental fast reactor Joyo. Two nominal values of the oxygen-to-metal ratio (O/M) of the fuel pellets, 1.95 and 1.98, were used as a test parameter. Emphasis was placed on the behavior of restructuring and redistribution of actinides which directly affect the fuel performance and the fuel design for fast reactors.