压水堆核电厂冷却剂碘同位素活度比值^(131)I/^(133)I与燃料完整性关系研究  

Research of Relationship Between Fuel Reliability and Iodine Isotope Activity Ratio^(131)I/^(133)I in PWR Primary Coolant

作　　者：付鹏涛 卢圣波 梁杉 杨晓环 徐洁皓 周文忠 韩嵩 FU Pengtao;LU Shengbo;LIANG Shan;YANG Xiaohuan;XU Jiehao;ZHOU Wenzhong;HAN Song(China Nuclear Power Technology Research Institute,Shenzhen 518028,China;French-China Institute of Nuclear Power,Zhuhai 519000,China;Yangjiang Nuclear Power Co.,Ltd.,Yangjiang 529500,China;Liaoning Hongyanhe Nuclear Power Co.,Ltd.,Dalian 116000,China;Fujian Ningde Nuclear Power Co.,Ltd.,Fuding 355200,China)

机构地区：[1]中广核研究院有限公司,广东深圳518028 [2]中山大学中法核工程与技术学院,广东珠海519000 [3]阳江核电有限公司,广东阳江529500 [4]辽宁红沿河核电有限公司,辽宁大连116000 [5]福建宁德核电有限公司,福建福鼎355200

出　　处：《原子能科学技术》2022年第1期153-158,共6页Atomic Energy Science and Technology

基　　金：中国广核集团燃料战略专项;中国广核研究院青峰计划。

摘　　要：压水堆核电厂正常运行期间燃料元件破损会造成一回路裂变产物活度升高,碘同位素活度比值^(131)I/^(133)I是行业内最常用的判断燃料破损情况的指标之一。本文介绍了压水堆正常运行期间冷却剂^(131)I和^(133)I的产生来源和迁移过程,建立模型估算了燃料完整、小破口和大破口情况下^(131)I/^(133)I范围,并通过在运CPR1000型压水堆核电厂的运行监测数据对计算模型进行了验证,两者符合得较好。During the normal operation of pressurized water reactor,fission products activity in the primary coolant will increase when failure of fuel rods happens.The prediction of the status of fuel failure has been paid great attention from industry for the long term with respect to radiological protection,radioactive consequence and the economy.The iodine isotope activity ratio^(131)I/^(133)I is one of the most important indicators to evaluate fuel reliability in nuclear power industry.In this paper,the production and release of fission products in fuel rods and the primary coolant were simulated by the kinetic model and the typical^(131)I/^(133)I in the primary coolant were theoretically estimated at the equilibrium conditions for the intact fuels,fuel failure with small defect and large defects,respectively.The radiochemical data in the primary loops were gathered and compiled from thirty six cycles in operating CPR1000 PWR units.The statistical results of these operation data show that the higher volume activities of radio-iodine in the primary loops may result from the dissemination of actinides due to secondary hydriding from the previous cycles and the^(131)I/^(133)I can be used to well identify the fuel reliability in comparison of the radio-iodine activities.In the cycles with fuel failure,the radio-iodine activities and^(131)I/^(133)I according to the operation data distribute much wider than the expected because the actual status of fuel failure are more complicated during operation than expected,e.g.changes of fuel failure size,the discrepancy of the location of fuel failure and the relative power of the defective fuel rods.In some cases,it is difficult to distinguish the fuel failure by radio-iodine owing to its low release rate from defective fuel rods.In addition,the size of fuel failure in the specific cycles can be illustrated by the significant change of^(131)I/^(133)I.It shows that the predictions by the model and the statistical results in operating CPR1000 PWR units are qualitatively in agreement fo

关 键 词：燃料破损 裂变产物释放 ^(131)I/^(133)I 

分 类 号：TL421.1[核科学技术—核技术及应用]