钍基熔盐堆238群中子-48群光子耦合库的研制

为满足新一代核能系统钍基熔盐堆核设计用AMPX格式多群中子-光子耦合常数库的需求,基于为钍基熔盐堆推荐的微观评价核数据库CENDL-TMSR和ENDF/B-Ⅶ.1热散射数据子库及光子-原子相互作用数据子库,采用中子-光子耦合群常数制作系统NPLC-2研制了一套AMPX格式的238群中子-48群光子耦合多群常数库。该库包含400个核素、12种热散射材料,温度从300~2 500K共5个温度点。该库采用窄共振近似进行共振自屏处理,重点锕系核素支持Nordheim方法处理共振自屏。经初步的临界基准验证和屏蔽基准验证,证明了该库的可靠性。

Developing of 238-neutron and 48-photon Coupled Group Constant Library for Thorium Molten Salt Reactor

To meet the demands of the development of the AMPX formatted multi‐group neutron‐photon coupled constant library for the next generation nuclear power system , thorium molten salt reactor (TMSR) ,based on the evaluated nuclear data library , CENDL‐TMSR recommended for the TMSR ,and thermal scattering data sub‐library and photon‐atom interaction data sub‐library of ENDF/B‐Ⅶ.1 ,an AMPX formatted 238‐neutron and 48‐photon coupled multi‐group constant library was developed using neutron‐photon coupled group constant processing system NPLC‐2 .The library contains 400 nuclides and 12 thermal scattering materials ,with five temperatures ranging from 300 K to 2 500 K . T he library utilizes the narrow resonance approximation for the resonance self‐shielding calculations .For some important actinium series nuclides ,the Nordheim method was provided to perform the resonance self‐shielding calculations . T he preliminary critical and shielding benchmark verifications confirm the reliability of this new library .