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遠隔操作によるAm含有MOX燃料製造技術の開発

Fabrication technology for MOX fuel containing AmO$$_{2}$$ by an in-cell remote process

吉持 宏; 石 洋平; 関 崇行*; 門藤 健司; 関根 伸一*; 小山 真一 

Yoshimochi, Hiroshi; Ishi, Yohei; Seki, Takayuki*; Mondo, Kenji; Sekine, Shinichi*; Koyama, Shinichi

3%及び5%のAmを添加したMOXペレット(Am-MOX)の遠隔操作による製造技術を開発した。大洗工学センターの照射後燃料試験室のホットセル内に系統的に機器を設置し、できる限りホットセル外部から自動で制御可能なシステムとした。UO$$_{2}$$ペレットとそれに続くPuO$$_{2}$$ペレット製造試験を通して、ボールミル時間、プレス及び焼結条件など、Am-MOXペレット製造に関する基本的な条件の絞り込みを行った。続いて、5%のAm-MOXペレット製造には、5%水素-95%アルゴン雰囲気中2000ppmの水分加湿条件下において1700$$^{circ}$$C,3時間の焼結条件が最適であることを把握した。さらに、この加湿雰囲気は、降温中に800$$^{circ}$$Cで停止することが重要であることがわかった。

An in-cell remote fabrication technique has been developed for MOX fuel pellets containing 3 and 5% americium (Am-MOX) at the Alpha-gamma Facility (AGF) in O-arai Engineering Center. A series of fuel pellet and the pin fabrication apparatuses were systematically installed in hot cell to make fabrication flow easier. After cold run and some modifications, they were remotely controlled from a panel in the operation room outside the hot cell as much as possible. From a preliminary UO2 pellet test and consequently plutonium pellet fabrication run, actual range of ball milling time, pressing and sintering condition were focused for Am-MOX pellet fabrication. As the next step, moisturized atmosphere was found out to remove the heterogeneity structure of 5% Am-MOX pellet. Finally, we established an optimized fabrication condition of 5% Am-MOX pellet sintered at 1700$$^{circ}$$C for 3h in an atmosphere of 5% H2-95% Ar with total moisture of 2000 ppm. Moreover it is important that the atmosphere has to be changed to dry gas at 800$$^{circ}$$C during cool down.

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