Library Dependency of Effective Multiplication Factor In Thorium Molten Salt Reactor

摘要

Molten salt reactors (MSRs) have been selected as one of the generation IV reactor systems for its high potential in the areas of safety, proliferation resistance, resource sustainability and waist reduction. One of the disadvantages of thermal MSRs is the replacement of graphite moderator due to neutron irradiation damage. From this point of view, we are interested in fast neutron spectrum MSR concepts without moderator. Now, we are trying to evaluate the performance of a fast MSR that uses the "Japanese recycled plutonium" as fissile material. We chose Thorium Molten Salt Reactor "TMSR" as our target fast MSR. TMSR is studied by LPSC/IN2P3/CNRS laboratories in France, and has single fluid molten salt fuel surrounded by fertile blanket salt. First of all, we tried to reproduce the results of TMSR research in France. As a result, we found that at BOC, effective multiplication factor which we calculated is too large. Consulting with original researchers, it is suggested that this difference may be caused by the difference of nuclear data libraries. While original researchers use ENDF/B-VI as the nuclear data library, we use JENDL3.3. In fact, the result of effective multiplication factor in SRAC2006 calculation using ENDF/B-VI is smaller than that using JENDL3.3. In this paper, we will discuss in more detail about the library dependency in TMSR using nine nuclear data libraries.