Research on Theoretical Calculation Method for Refined Modeling of Fast Neutron Flux in Irradiation Surveillance Capsule

To deal with the problem of the notable calculation error of Irradiation surveillance capsule fast neutron flux compared with the measured values,the calculation model has been improved and a refined calculation model has been built by detailed inner configuration of assemblies in core.Comparison has been made between conventional compendious model results,refined model results and measured values.It is obviously that the calculation error of the refined model has been greatly reduced.