摘要
我国10MW高温气冷堆采用全陶瓷型包覆颗粒球形燃料元件。TRISO型包覆燃料颗粒由燃料核芯、疏松热解碳层、内致密热解碳层、碳化硅层和外致密热解碳层组成。采用丙烯和乙炔混合气体制备致密热解碳层以及四层连续包覆的新工艺,开展生产工艺条件试验,系统地研究了生产工艺和性能之间的关系,摸索出最佳生产工艺条件。用化学气相沉积方法在150mm流化床沉积炉系统中批量生产出TRISO型包覆燃料颗粒。用扫描电镜观察分析了包覆燃料颗粒的微观结构,包覆燃料颗粒的制造破损率为3.4×10-6,冷态性能达到我国10MW高温气冷堆设计要求。包覆燃料颗粒辐照考验结果(放射性裂变产物释放率R/B为1×10-6左右)表明,包覆燃料颗粒的质量可以满足10MW高温气冷堆安全运行的要求。
The10MW high temperature gas cooled reactor(HTR-10)was constructed in China.The HTR-10uses spherical all-ceramicfuel elements with TRISO type coated fuel particle.The TRISO coated fuel particle consists of a mi crospherical fuel kernel and coating layers of a porous pyrolytic carbon,an inner dense pyrolytic carbon,a pyrolytic silicon carbide and an outer dense pyrolytic carbon.The advanced coating technology of using a gas mixture of propylene(C 3 H 6 )and acetylene(C 2 H 2 )and the successive four -layercoating processes were developed.The relationship between the coating pa-rameter and the properties of the coated fuel particles has been systematically investigated.The opti-mum coating technology was obtained.The TRISO type coated fuel particles with the properties fulfill-ing the design specification for the HTR-10have been fabricated by chemical vapour deposition in a150mm diameter fluidized bed coating furnace.The microstructure of coated fuel particles was ob-served by using SEM(scanning electron microscope).The failure rate of as-fabricatedcoated fuel parti-cles is3.4×10 -6 .The result of irradiated tests,the fission gas release to birth ratio R/B is about 1×10 -6 ,confirms that the quality of the coated fuel particles can meet the requirement of the safety operation for the HTR-10.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2002年第2期76-81,共6页
Nuclear Power Engineering
基金
国家"863"能源重点项目863-614-02
关键词
高温气冷堆
包覆燃料颗粒
流化床
化学气相沉积
燃料元件
制备
High Temperature Gas Cooled Reactor(HTGR)
Coated fuel particles
Fluidized bed
Chemical vapour deposition
