钍基熔盐堆238群中子-48群光子耦合库的研制

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

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。

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 formatted238-neutron and 48-photon coupled multi-group constant library was developed using neutron-photon coupled group constant processing system NPLC-2.The library contains400 nuclides and 12 thermal scattering materials,with five temperatures ranging from300 Kto 2 500 K.The 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.The preliminary critical and shielding benchmark verifications confirm the reliability of this new library.