瞬发和缓发γ射线对堆内构件释热率影响的研究  

Study on the influence of prompt fission γ-ray and delayed γ-ray on reactor internals heating rate

作　　者：苏耿华 石秀安 蔡德昌 李雷 

机构地区：[1]中科华核电技术研究院,广东深圳518026

出　　处：《核科学与工程》2012年第2期150-155,共6页Nuclear Science and Engineering

摘　　要：为提高核电设计中反应堆堆内构件释热率计算的准确性,本文在原来MCNP外中子源模型计算方法的基础上,计算分析瞬发裂变γ对堆内构件释热率的贡献。计算结果显示,考虑瞬发裂变γ使得堆内构件的释热率增加9%～38%,离堆芯越近的堆内构件的增加值越大。另外,分析认为缓发γ对堆内构件释热率的贡献与瞬发裂变γ相当。因而反应堆堆内构件释热率计算中除了考虑中子及中子俘获所生γ的贡献,还应该考虑瞬发裂变γ和缓发γ的贡献。To improve the accuracy of the calculated reactor internals heating rate in the design of nuclear power plants, this paper studied the contribution of prompt fission γ to the reactor internals heating rate based on the original method of MCNP external neutron source model. The results revealed that the reactor internals heating rate increased by 9%-38% with prompt fission γ taken into account and the internals nearer to the core had a lager increment. In addition, it is believed after analysis that the contribution of the delayed γ on reactor internals heating rate is similar to the prompt fission γ. Therefore, when calculating reactor internals heating rate, in addition to the neutron source and neutron capture γ, prompt fission γ and delayed γ should also be considered.

关 键 词：堆内构件释热率 瞬发裂变γ射线 缓发γ射线 

分 类 号：TL32[核科学技术—核技术及应用]