| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce reactivity loss at the end of an operation cycle of a core loaded with fuel assemblies without spoiling criticality safety as compared with the fuel assembly using only erbium as burnable poison. <P>SOLUTION: In a method of designing the fuel assembly loadable in a nuclear reactor by bundling fuel rods filled with uranium pellets, first, a virtual fuel assembly is designed which can be loaded in the nuclear reactor using only erbium as the burnable poison. Next, the fuel assembly, which has the same uranium enrichment distribution as the virtual fuel assembly and of which the maximum value of a neutron multiplication factor is smaller than that of the virtual fuel assembly, is designed by subtracting erbium enrichment from the virtual fuel assembly and adding gadolinium thereto. <P>COPYRIGHT: (C)2012,JPO&INPIT |
