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Application of homogenization techniques for inflow transport approximation on light water reactor analysis

Nuclear Science and Techniques 2022年第1期33卷 67-80页

作者： Xiang Xiao Kan Wang Tong-Rui Yang Yi-Xue Chen Department of Engineering Physics Tsinghua UniversityBeijing 100084China State Power Investment Corporation Research Institute Co.LtdBeijing 100029China

The transport cross-section based on inflow transport approximation can significantly improve the accuracy of light water reactor(LWR)analysis,especially for the treatment of the anisotropic scattering *** previous inflow transport approximation is based on the moderator cross-section and normalized fission source,which is approximated using transport *** the accuracy of reactivity is increased,the P0 flux moment has a large error in the Monte Carlo *** this study,an improved inflow transport approximation was introduced with homogenization techniques,applying the homogenized cross-section and accurate fission *** numerical results indicated that the improved inflow transport approximation can increase the P0 flux moment accuracy and maintain the reactivity calculation precision with the previous inflow transport approximation in typical LWR *** addition to this investigation,the improved inflow transport approximation is related to the temperature *** improved inflow transport approximation is flexible and accurate in the treatment of the anisotropic scattering effect,which can be directly used in the temperature-dependent nuclear data library.

关键词： Inflow transport approximation Anisotropic scattering effect Homogenization techniques light water reactor

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Wide Range Neutron Monitoring(WRNM)System in Boiling water reactors(A Short Communication&Memorandum)

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Journal of Energy and Power Engineering 2022年第5期16卷 186-212页

作者： Seyed Kamal Mousavi Balgehshiri Ali Zamani Paydar Bahman Zohuri Amirkabir University of Technology TehranIran Galaxy Advanced Engineering AlbuquerqueNew Mexico

The WRNM(wide range neutron monitoring)is a newly developed neutron monitoring channel which was initially conceived as a means to meet Regulatory Guide 1.97 requirements for post-accident neutron *** scope was expanded to include the startup monitoring function with the aim of replacing both the source and IRMs(intermediate range monitors)in BWRs(boiling water reactors).The WRNMs,consisting of a newly designed fixed incore regenerative sensor and new electronics,which include both counting and MSV(mean square voltage)channels,have been tested in several reactors and its capabilities have been *** channel will cover the neutron flux range from 103 nv to 1.5×103 nv;it has greater than 1 decade overlap between the counting and MSV *** of the regenerative fissile coating the sensor,even though fixed incore,has a life of approximately 6.0 full power years in a 51 kW/L BWR and similar situation has been proposed for newly designed small modular reactor such as BWRX-300 of General Electric Hitachi reactor.

关键词： BWR light water reactor advanced reactor advanced small modular reactor high temperature advanced reactor Generation IV nuclear power reactors nuclear energy nuclear radiation environment

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