Verification of 3d heterogeneous core transport calculation utilizing non-linear iteration technique

Abstract

A three dimensional heterogeneous core transport analysis code CHAPLET-3D which is based on deterministic methods has been developed. In CHAPLET-3D code the non-linear iteration technique which is commonly used in advanced nodal diffusion codes is employed to perform three dimensional heterogeneous core calculation in a form of conventional finite difference method with the accuracy of the method of characteristics in radial two dimensional geometry. For an axial direction solver in addition to finite difference method and nodal expansion method in diffusion theory the method of characteristics has been incorporated in order to take account of transport effect. According to the verification tests compared with the results of multi-group Monte Carlo reference calculations it is found that the accuracy of CHAPLET-3D code for three dimensional heterogeneous core analysis is almost the same level as that of the reference calculation and also demonstrated that the three dimensional core analysis method utilizing the non-linear iteration technique introduced here is valid and useful. © 2004 Taylor & Francis Group, LLC.