Effective application of partitioning and transmutation technologies to geologic disposal

Ikegami, Tetsuo; Ahn, J.*

Environmental Impact, which is a newly developed measure in stead of the conventional radio-toxicity, has been evaluated for both the PWR cycle and the FBR cycle in order to clarify what kind of radio-nuclides and how much level of partitioning and transmutation are desirable. Bounding analysis for uncertainty of parameters relevant to radionuclide transport in a repository has also been performed. The evaluated results imply that the targets of partitioning and transmutation can be set; (1)In the case of PWR cycle, the release rate of Np and Am should be controlled under 1 %, in addition to the conventionally assumed release rate of 0.604 % for U and 0.297 % for Pu. (2)In the case of FBR cycle, recovery rate of 99.9 % for all actinide nuclides is appropriate.