Modeling of CANDU Reactivity Devices with WIMS-AECL/Multicell and Superhomogenization

Abstract

A method for the calculation of the three-dimensional neutron flux distribution in and around CANDU reactor fuel channels and reactivity control devices has been developed. The method is based on one- and two-dimensional transport calculations with the WINS-AECL lattice cell code. SPH homogenization. and three-dimensional flux calculations with finite-difference diffusion theory using the MULTICELL code. Numerical verification tests have shown good agreement with more rigorous calculations. and validation tests indicate good agreement with measured device properties.