ADVANCED INITIAL CORE FUEL ASSEMBLY CONFIGURATION, AND CONFIGURATION METHOD THEREFOR

摘要

PPROBLEM TO BE SOLVED: To provide an advanced initial core fuel assembly configuration, and a configuration method therefor. PSOLUTION: This advanced initial core fuel assembly configuration improves fuel control efficiency in a nuclear reactor, and economics thereby. This configuration method for an initial core comprises preparation of a plurality of fuel assemblies different in average enrichments of uranium 235, and array of the plurality of fuel assemblies to constituted the initial core of configuration of emulating an known equilibrium reload cycle core at least in term of a spacial reactivity distribution. The resulting average enrichment in the initial core is within a range from about 1.0wt.% or less of uranium 235 to about 5.0wt.% of uranium 235. The design for an advanced lattice is also disclosed. PCOPYRIGHT: (C)2006,JPO&NCIPI