Lead-Bismuth Cooled Fast Reactor Conceptual Design in Feasibility Study

摘要

A comparative design study is performed on Pb-Bi cooled reactors with forced and natural convection (FC and NC) cooling. Eliminating an intermediate cooling system makes the heat transport system simple and can decrease the amount of the weight of NSSS. The Lead-Bismuth cooled reactor concepts may attain construction cost goal (￥200,000/kWe). And, the nitride fuel makes breeding ratio of 1.2 with 150GWd/t of burnup. The results of unprotected event analyses such as UTOP and ULOF show that both of concepts have possible features to withstand unprotected events due to negative reactivity feedback by Doppler effect, control rod drive line expansion, etc.. These results lead to a conclusion that both of concepts have possible capability as one of future promising core concepts.