A feasibility study on TRU burning in a small fast reactor with negative sodium void worth

A concept of a super safe small and simple reflector controlled fast reactor(4S) has been developed. This reactor concept has many excellent features among which are: (1) negative temperature feedback reactivity coefficients including Na void (whole core void) coefficient; (2) very long reactivity life time of about 10 years, in other words, no refuelling is required during 10 years of consecutive operation. In the present study, this concept was further developed to accommodate various fuel cycle options anticipated from now to a very long future. As a result it was concluded that with only slight design changes this reactor concept can be adapted to various fuel cycle options without impairing above mentioned excellent features. Design changes associated with each fuel cycle option and related neutronic performances of the core are described. (author)