Neutronics Analysis for Core Assembly in Inverted Hydride-Fueled Pressurized Water Reactor

In order to obtain the size of assembly cell with a better physical performance,a preliminary neutronics study was carried out for IPWR core using MCNP program.Firstly,the paper have studied how the k_eff changed with different H/HM（Hydrogen atoms/Heavy metal atoms） in different soluble boron concentration,and a size arrangement of assembly cell lattices is obtain.By comparing the physical performance of different size of assembly cell lattices,some assembly cell lattices which have a better physical performance are obtained.The result shows that:when the H/HM is 6.5 and water channel diameter ranges from 9 to 11mm,the assemblies have a better physical performance and an inherent safety.