Neutronic analysis of heavy water application in HPLWR ECCS

Th e aim of this study is to predict the neutronic behavior of heavy water emergency core cooling system (ECCS) (instead of light water ECCS) in HPLWRs during LOCA. Th e High-Performance Light Water Reactor (HPLWR) is the European version of the Supercritical-pressure Water Cooled Reactor (SCWR). Light water reactors at supercritical pressure, being currently under design, are the new generation of nuclear reactors. Neutronic calculations are performed using WIMS and CITATION codes. Changes in neutronic parameters, such as neutron cross-sections, effective multiplication factor and power peaking factor during LOCA, are discussed by injecting different concentrations of the heavy water coolant by ECCS.