Although the gain of nuclear fuel for FBR is very fast, more inventory of fissible fuel and higher capital cost are needed, and the inventory during initial stage of FBR development must be supplied by the thermal converters.

• 快中子增殖堆核燃料的增产速度很高,但初装的可裂变材料多,基建投?大,其初始发展阶段所需燃料向?由热中子?化堆提供。