SCALE 6.1.3 Effective Heavy Reflector Cross Sections Sensitivity Analysis for a PWR GENIII Assembly/Reflector System

This paper presents the results of a sensitivity analysis on code and operational parameters for the evaluation of the effective cross sections of a central assembly/heavy reflector GENIII PWR system. The methodology used for the calculation is based on the T- NEWT control module of SCALE 6.1.3 package. In detail, the sensitivity analysis on the heavy reflector cross sections has been performed on the following set of code parameters: reflector zone computational meshes, Sn and Pm transport parameter, cross sections libraries and convergence parameters (eigenvalue and eigenfunction). It also has been carried out a series of calculations on a set of operational parameters such as: boron concentration (0 and 1300 ppm), operational condition (HZP and HFP) and reflector temperature (Tmax and Tmod).