Criticality safety evaluation for high-density spent-fuel storage racks

[[abstract]]Using as a starting base the high-density spent-fuel storage racks to be put into the Chinshan and Kuoshang nuclear power plants, a series of criticality analyses with various combinations of fuel assemblies and storage rack designs were performed using an AMPX-KENO/XSDRNPM computer code package. The calculated k∞ value for the storage pools in the two subject plants using Boral (0.013 g/cm2 10B) poisoned rack lattices and 3.2 wt.% enriched fuel assemblies is 0.900 under conservative assumptions. Considering all the calculation biases and statistical and manufacturing uncertainties, the maximum k∞ value is estimated to be 0.929 under normal storage conditions. Variation in water temperature and density or abnormal positioning of fuel assemblies results only in a negative effect on k∞ value.[[fileno]]2060131010052[[department]]工程與系統科學