耐事故包壳中子经济性分析  

Neutronic Economy Analysis of Accident Tolerance Cladding

作　　者：娄磊[1] 李满仓[1] 柴晓明[1] 于颖锐[1] 姚栋[1] 王连杰[1] 秦雪 刘勇[1] LOU Lei;LI Man-cang;CHAI Xiao-ming;YU Ying-rui;YAO Dong;WANG Lian-jie;QIN Xue;LIU Yong(Key Laboratory on Reactor System Design Technology,Nuclear Power Institute of China,Chengdu,Sichuan Prov.610213,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213

出　　处：《中国核电》2021年第2期273-276,共4页China Nuclear Power

基　　金：国家自然科学基金(编号:1170051016)。

摘　　要：福岛核事故之后,核燃料在事故工况下的安全性越来越受到重视,提出耐事故的概念,其中包含耐事故包壳。耐事故包壳可以有效防止锆合金(Zr)包壳可能出现的“锆水”反应,同时在深燃耗或一些极限工况下保持包壳结构的完整性,有效预防核事故。本文以传统压水堆组件锆合金包壳做对照,分析对比了热门耐事故包壳材料的中子经济性,不同包壳厚度下组件循环长度,以及固定包壳厚度时,达到要求的循环长度所需的燃料富集度。通过研究发现,包壳经济性由高到底排序为:SiC>SiC涂层>Zr>FeCrAl>APMT>304SS>310SS。研究结果对耐事故包壳用于压水堆核设计具有借鉴和指导意义。After the Fukushima nuclear accident,the safety of nuclear fuel under accident conditions has been paid more and more attention,and the accident tolerance cladding included in accident tolerance fuel has also been proposed in nuclear design as a type of accident tolerance concept.The accident tolerance cladding can effectively prevent the possible zirconium water reaction of the cladding,while maintaining the integrity of the cladding structure under deep burnup or some extreme conditions,effectively preventing nuclear accidents.In this paper,the traditional zirconium cladding of pressurized water reactor is used as reference to analyze and compare the neutronic economy of common accident tolerance cladding materials,the cycle length of fuel assembly under different cladding thicknesses,and the required fuel enrichment when the cladding thickness and required cycle length are fixed.It is found through study that the economic order of cladding from high to low is as,SiC>SiC coat>Zr>FeCrAl>APMT>304SS>310SS.The results have guiding significance for the design of PWR.

关 键 词：耐事故包壳 “锆水”反应 中子经济性 包壳厚度 燃料富集度 

分 类 号：TL2[核科学技术—核燃料循环与材料]