事故容错燃料安全性能初步分析  

Preliminary Analysis of Safety Performance for Accident-tolerant Fuel

作　　者：杨红发 巫英伟[2] 尹莎莎 刘明皓 汪宇[1] 赖建永[1] 廖先伟 谢海燕 王嘉瑞 欧阳斌 YANG Hongfa;WU Yingwei;YIN Shasha;LIU Minghao;WANG Yu;LAI Jianyong;LIAO Xianwei;XIE Haiyan;WANG Jiarui;OUYANG Bin(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an 710049,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 [2]西安交通大学核科学与技术学院,陕西西安710049

出　　处：《原子能科学技术》2020年第8期1441-1447,共7页Atomic Energy Science and Technology

摘　　要：事故容错燃料(ATF)是通过提高燃料材料热物性或包壳材料抗高温氧化性能来加强核燃料的事故容错能力,从而使核燃料能长期忍受严重事故。使用二次开发适用于ATF的RELAP5程序,对UO 2-FeCrAl、FCM-FeCrAl这两种ATF和传统核燃料UO 2-Zir-4进行大破口失水事故安全分析。对比事故分析结果可知:相较于传统UO 2芯块,稳态运行工况下,热导率高的FCM芯块具有更低的燃料中心温度和更小的燃料径向温度梯度,同时在瞬态事故工况下,FCM芯块具有更低的瞬态初始温度和更小的燃料温度增长速率。相较于传统Zir-4包壳,在瞬态事故工况下,FeCrAl的包壳峰值温度更小,达到的时间更晚,同时由于FeCrAl包壳具有良好的抗高温氧化性能,事故过程中产生的氢气质量更小。Accident-tolerant fuel(ATF)is to enhance the accident-tolerant capacity of nuclear fuel by improving the thermal properties of fuel materials or the high temperature oxidation resistance of cladding materials,so that nuclear fuel can endure serious accidents for a long time.Using RELAP5 program developed for ATF,safety analysis of UO2-FeCrAl,FCM-FeCrAl and conventional nuclear fuel UO2-Zir-4 was carried out.Compared with conventional UO2 pellets,FCM pellets with higher thermal conductivity have lower fuel center temperature and smaller radial fuel temperature gradient under steady state operating conditions.FCM pellets also have lower transient initial temperature and lower fuel temperature growth rate under transient accident condition.Compared with conventional cladding Zir-4,the peak cladding temperature of FeCrAl is smaller and reaches later under transient accident condition.Meanwhile,due to the better high temperature oxidation resistance of FeCrAl cladding,the smaller hydrogen mass production is produced during the accident progress.

关 键 词：事故容错燃料 RELAP5程序 事故容错能力 抗高温氧化性能 

分 类 号：TL33[核科学技术—核技术及应用]