可行性研究中由于原设计方案中重水箱的内壁处中子注量率较高,材料辐照损伤严重,因此在反应堆的设计寿期内,重水箱必须更换。为了避免重水箱的更换,并使设计更合理,对原设计方案作了以下改动:1)将原设计中的重水箱内壁取消,即将“双壁”变为“单壁”,使重水箱在堆设计寿期内不 In the feasibility study, due to the high neutron fluence rate on the inner wall of the heavy water tank in the original design scheme and severe radiation damage to the material, the heavy water tank must be replaced during the design life of the reactor. In order to avoid the replacement of heavy water tank and make the design more reasonable, the following changes were made to the original design scheme: 1) The inner wall of the heavy water tank in the original design was canceled, that is, the “double wall” was changed to “single wall” Heap design life is not