秦山三期重水堆核电站主要特点: 1.用天然铀作燃料压水堆的核燃料是U-235的低浓缩铀(3～4Wt％),而重水堆的核燃料可以用天然铀。这是因为重水堆是以重水作慢化剂和冷却剂的反应堆。重水的中子吸收载面小,慢化系数大,慢化性能好,中子利用率高,故可直接利用天然铀(U-235含量O.711Wt％)作燃料。主要优点有: (1)不需要花巨资建造铀浓缩工厂或从国外进口浓缩铀,这有利于无铀浓缩能力的国家发展核电:对于有铀浓缩能力的国家,节省的铀浓缩分离功可作为它用。 (2)从重水堆卸出的燃料燃烧得充分,U-235含量(约O.2Wt％)低于浓缩铀厂尾料的富集度,这样就不急于进行乏燃料后处理,可把乏燃料贮存起来,在需要时再提 The main features of Qinshan Phase Ⅲ heavy water reactor nuclear power plant: 1. Natural uranium for fuel pressurized water reactor nuclear fuel is U-235 low enriched uranium (3 ~ 4Wt%), and heavy water reactor nuclear fuel can use natural uranium. This is because heavy water reactors are heavy water reactors and coolants. Heavy water neutron absorption of small surface, slowing down coefficient, slow performance, high neutron utilization, it can be directly used natural uranium (U-235 content O. 711Wt%) as a fuel. The main advantages are: (1) The need to spend uranium enrichment plants or to import enriched uranium without enrichment, which is conducive to uranium enrichment countries to develop nuclear power: For uranium enrichment countries, the savings of uranium enrichment separation function As it is used. (2) The fuel discharged from the heavy water reactor burns sufficiently that the U-235 content (about O.2Wt%) is lower than the enrichment of the enriched uranium tailings so that it is less in a hurry to carry out spent fuel reprocessing, Fuel is stored and re-mentioned when needed