Analysis of the influence of the thermalhydraulic to neutronic mapping in the RIA analysis in Almaraz NPP

摘要

The present work consists of the study of the influence of different definitions of the thermalhydraulic model in a REA analysis at Almaraz NPP using RELAP5/PARCS v2.7 coupled code. A series of calculations with different number of thermalhydraulic channels to represent the core has been made. These channels have been coupled to the neutronic model, developed in a one-to-one basis, that is, each fuel assembly is represented by a radial node in PARCS v2.7 code. The mapping between the thermalhydraulic and the neutronic model has been performed in different ways to study its influence in the 3D results. This study contributes to obtain more accurate results in the REA analysis in Almaraz NPP.