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一、设计依据 根据重水堆的改建要求,石墨反射层和生物屏蔽层不作变动,内壳及其内部堆芯部件全部更新。为此需要设计一个新的内壳和防护铝塞。按最后确定的物理和热工方案,燃料元件工艺管从原设计84根减少到72根,栅距从原来130毫米改为92毫米。由于紧缩栅格的结果,使活性区中心形成一个边长为195毫米的正方重水空腔,活性区外围形成一个230毫米厚的重水反射层。
First, the design basis According to the rebuilding requirements of heavy water reactor, graphite reflector and biological shielding layer does not change, the inner shell and its internal core components are all updated. To do this, we need to design a new inner shell and protective aluminum plug. According to the finalized physical and thermal solutions, the number of fuel cell process tubes was reduced from 84 to 72 and the pitch was changed from 130 mm to 92 mm. As a result of the shrinking grid, a center heavy water cavity with a side length of 195 mm was formed in the center of the active area, and a 230 mm thick heavy water reflective layer was formed around the active area.