再処理施設と燃料製造施設の一体化による経済効果

An Evaluation of cost reduction advantages of nuclear-fuel-recycling complex

西村 友宏

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一体型リサイクル施設の経済個かの定量化を目的として、酸化物燃料を対象にした金属電解法再処理-振動充填燃料製造の一体型施設概念設計(50tHM/y)をもとに、再処理と燃料製造をそれぞれ独立した単独立地型の施設とした場合について施設概念設計を行うとともに、一体型施設との比較・評価を行った。その結果、再処理と燃料製造を単独立地型にすると、一体型施設と比較して、1)再処理施設には再処理製品の貯蔵・払出設備が、燃料製造施設には受入・貯蔵設備が新たに必要である。2)再処理と燃料製造施設の主建屋の面積と体積は、再処理製品の貯蔵・払出・受入設備が追加になったことにより、それぞれ約30%大きくなる。3)建設費も約30%増となるが、建設費増加分の約50%は、追加された再処理製品の貯蔵・払出・受入設備費によるものである ことが明らかとなった。逆に、一体型リサイクル施設の経済効果の観点からいうと、再処理と燃料製造を一つの建屋に配置すると、再処理製品の払出・受入貯蔵設備が不要に、単独立地型施設と比べて建設費で約20%の低減効果があることが明らかとなった。また、再処理と燃料製造を別建屋にしても、隣接させて地下トレンチでつなげれば、再処理製品の払出・受入貯蔵設備が不要になることから、約10%程度の建設費低減効果が期待できる。

A design study of separate recycling plants was at first carried out based on a recycling complex design. The former is made up of an independently operating reprocessing plant and an independently operating fuel-manufacturing plant, the latter is a complex of reprocessing and manufacturing of nuclear fuel in one building. Comparisons were then made between the separate recycling plants and the recycling complex to clarify cost reduction advantages of the nuclear-fuel-recycling complex. The following results are presented. (1)The separate reprocessing plant requires storage and shipping facilities of its product, and the separate fuel-manufacturing plant requires receiving and storage facilities of the product. (2)The totals of the areas and volumes of the main buildings of the separate plants are about 30% larger than those of the complex. (3)The total of the construction costs of the separate plants is about 30% higher than that of the complex. About a half of the additional cost is due to the addition of the facilities. From the point of view of cost reduction advantages of a recycling complex, the results show that a recycling complex would be built at a reduction of about 20 % from construction costs of separate plants, because storage, shipping, and receiving facilities will be made redundant for the complex. The results also suggest that construction cost reduction of about 10 % would be expected for a recycling plant made up of two buildings that are connected each other with a trench.