从第五不稳定核素系的特性论核燃料的有效利用

Discussion on effective utilization of nuclear fuel based on peculiar property of the Fifth Unstable Nuclide Series

以第五不稳定核素系在生长时期的耗裂转化比不断增长的特性以及在不同堆型中它的任一衍生核素的饱和含量比值并不相同的特性作为论述的依据，得出了目前从压水堆中取出的废燃料并未获得有效充分利用的论断。认为只须对废燃料经过去除裂变产物的后处理去污流程，即可重新作为动力堆的核燃料使用，避免了使铀钚分离以及(２３５)Ｕ再度浓集的流程。并对如何使用此再制的核燃料提出两种方案，分别适用于压水堆和以天然铀为燃料的坎杜重水堆。

Based on a peculiar property of the Fifth Unstable Nuclide Series(FUNS) in developing stage, namely the transformation rate of parent fuel-^(238)U consumption to fission production being increased with the fuel's reactor core life, it was shown that the used fuel taken out from the reactor core of PWR could be used again as PWR fuel, and the post processing for the used fuel needed only to de-contaminate the fission Products from the used fuel and then to rebuild it into its normal form.Scheme A in the article discussed the condition of using such rebuilt used fuel in PWR. Another peculiar property of FUNS is characterized by the fact that the equilibrium saturate concentrations of the derived nuclides in FUNS are different for different types of reactor. It is well known that the saturate concentration of ^(239)Pu in PWR is much larger than that in HWR. Scheme B in the article, i.e. a method of using the rebuilt used fuel from PWR to replace the natural uranium fuel for HWR,was discussed.