ABSTRACT

The impact of disposal of mixed oxide (MOX) fuel from light water reactors (LWRs) has been considered from the viewpoint of the thermal properties and the number of the vitrified waste for various conditions of the nuclear fuel cycle. In addition, the effect of separation of the minor actinides (MAs) (Np, Am, Cm) that potentially influence the geological disposal area has been evaluated quantitatively. Review of the effect of MAs separation on heat generation in MOX fuel disposal has revealed that dedicated measures for thermal impact reduction need to be developed for the purpose of nuclear-fuel-cycle evaluation from the viewpoint of continuous utilization of Pu. Not only MA separation, but also the nuclear fuel cycle conditions, technical options, waste occupied area per waste package are strongly relevant to the thermal properties of the vitrified waste, and it is necessary to consider the combination of these factors together with the number of waste packages to progress the feasibility studies for geological disposal of MOX-LWR.

摘要

轻水反应堆 (LWR) 中混合氧化物 (MOX) 燃料处置的影响已从核燃料循环的各种条件下的热特性和玻璃化废物数量的角度考虑。此外，对可能影响地质处置区的次锕系元素 (MAs) (Np、Am、Cm) 的分离效果进行了定量评估。对 MAs 分离对 MOX 燃料处置中发热的影响的回顾表明，为了从 Pu 的持续利用的角度评价核燃料循环，需要制定专门的减少热影响的措施。不仅是 MA 分离，还有核燃料循环条件、技术选择、