一、引言 在钍增殖反应堆设计中,采用空心或带夹层空腔的石墨球作为核燃料元件的包壳。石墨球设计为一完整结构,球壳不开孔、无接缝、而采用加压的方法将液态燃料盐压入空腔内,元件在堆内达一定燃耗后再用离心法将熔盐排出以进行后处理。 国外制造的空心石墨球,系采用机械加工方法制造的。这样就需要在球壳上钻孔, I. INTRODUCTION In the design of thorium multiplication reactors, graphite balls with hollow or sandwich cavities are used as cladding for nuclear fuel elements. Graphite ball is designed as a complete structure, the ball shell is not perforated, no seams, and the use of pressurized liquid fuel pressure into the cavity, the components up to a certain burn up in the reactor and then centrifugal method will molten salt Discharge for post-treatment. Hollow graphite ball made abroad, the Department of mechanical processing methods of manufacture. This will require drilling in the shell,