並列タイトル等Development of producing MOX fuel by "Short Process", 1; Development of Pu/U ratio control by liquid mixing: An annual report in fiscal 2000
一般注記プルトニウム転換技術開発施設は,1983年にプルトニウム試験を開始後,1986年に使用前検査の合格証を取得し,これまでに約13tのプルトニウム・ウラン混合酸化物粉末の転換を実施してきた。 運転開始以来約15年を経過し,設備の老朽化が進んでいることから計画的に設備更新を実施している。第1回設備更新は,1993年から1994年にかけて焙焼還元炉,廃液蒸発缶等の更新工事を実施した。第2回設備更新は,1998年から1999年にかけて脱硝加熱器,混合機等の更新工事を実施した。 第2回設備更新において,汚れがひどく内部の確認に支障のあるグローブボックス覗き窓の更新工事を実施した。更新工事は,当初グローブボックス覗き窓の交換作業を実施していたが,並行して進めていたグローブボックス覗き窓の研磨作業のR\&Dが終了し,技術的に実施可能な方法であるとの評価が得られたことから,途中から窓更新ではなく窓研磨作業に切替えて予定されたグローブボックス覗き窓の更新工事を実施した。 本報告書は,グローブボックス覗き窓の交換作業,グローブボックス覗き窓の研磨作業について,作業手順,実績(工程,体制,被ばく,廃棄物発生量)等についてまとめたものである。
In plutonium conversion development facility (abbreviated to PCDF) in JNC (Japan Nuclear Cycle Development Institute) Tokai Reprocessing Plant, investigations of producing MOX nuclear fuel by a simplified process have been studied. A study of this process, which is called "Short Process", has been carried out for the purpose of decreasing the production cost of MOX fuel in cooperation with plutonium fuel center in JNC Tokai Works. The purposes for this study are, (1)to decrease the number of equipment by the simplification of our MOX fuel production process (2)to improve the working ratio (3)to stabilize the quality of MOX fuel (4)to decrease the amount of the hold-up of MOX fuel in glove boxes (5)to improve an efficiency of transporting nuclear materials (6)to decrease operating cost In this "short process", it is necessary to mix plutonium nitrate solution and uranium nitrate solution with relatively high accuracy on the assumption that the adjustment of Pu/U ratio is controlled as a liquid state. As a result, the volume of these nitrate solutions has to be measured and transported to another vessel within high accuracy. At first, in fiscal 1999, a mock-up apparatus equipped with airlift systems, which imitated solution-mixing process in PCDF, was designed, made and assembled together. In fiscal 2000, by using this mock-up airlift apparatus, tansferring experiments were carried out both to estimate the accuracy of Pu/U mixing ratio in PCDF operation plant and to confirm characteristics of the airlift pump systems in PCDR The results showed that Pu/U ratio control in PCDF plant could not always satisfy the specifications for MOX fuel. From both the operation data in PCDF and results of our experiments, investigations were carried out for the purpose of improving the accuracy of Pu/U ratio control.Our mock-up airlift apparatus was modified and the accuracy of Pu/U ratio control was reexamined. It was confirmed that Pu/U ratio control by modified airlift ...
一次資料へのリンクURL/JNC-TN8400-2001-021.pdf (fulltext)
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