压水堆一回路污垢放射性分布预测模型  

Prediction model of fouling radioactive distribution in primary loop of pressurized water reactor

作　　者：王世伟 刘晓晶[1,2] 张滕飞 何辉 WANG Shiwei;LIU Xiaojing;ZHANG Tengfei;HE Hui(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Digital Nuclear Reactor Technology Intergration Innovation Center,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海市数值反应堆技术融合创新中心,上海200240

出　　处：《核技术》2025年第4期112-120,共9页Nuclear Techniques

基　　金：国家自然科学基金(No.U20B2011,No.52176082);曙光计划(No.21SG13);中核集团领创项目资助。

摘　　要：为研究压水堆一回路堆芯污垢中放射性物质的产量和分布情况,以典型压水堆(Pressurized Water Reactor,PWR)一回路为研究对象,针对一回路中的放射性物质,建立了污垢沉积及放射性物质的产量分布预测模型。模型对污垢沉积和放射性物质的预测结果与污垢仿真程序CRUDSIM(Chalk River Unidentified Deposits SIMulation)的计算结果差异小于5%。在此基础上,分析了冷却剂流速、氢气含量和冷却剂入口温度的影响。结果表明:放射性物质的含量随堆芯冷却剂流速和氢气含量而增大,且对蒸汽发生器(Steam Generator,SG)中放射性物质含量的影响比堆芯分别高93.9%和10%。冷却剂入口温度增加8%时,放射性物质的含量减小9%,且对堆芯中放射性物质含量的影响比SG大19%。降低冷却剂流速和降低氢气含量有利于降低SG的放射性物质含量;提高冷却剂入口温度可以有效降低堆芯的放射性物质含量。[Background]Corrosion products such as iron and nickel ions generated in the steam generator(SG)of a pressurized water reactor(PWR)deposit on the fuel rods in the reactor core,forming Chalk River Unidentified Deposits(CRUD).Activated by neutron irradiation in the reactor core,part of the CRUD layer transforms into radioactive substances,which are mainly 58Co and 60Co.Then the radioactive 58Co and 60Co are carried by the coolant into the entire primary loop.The existing research lacks a comprehensive modeling and discussion on the distribution of radioactive materials 58Co and 60Co in the primary loop.Predicting the content and distribution of radioactive materials 58Co and 60Co in the primary loop and assessing the impact of water chemistry and thermal parameters are of significant importance for radiation protection and core parameter design.[Purpose]This study aims to explore the production and distribution of radioactive materials in the primary loop due to the deposition of CRUD in reactor core,with a typical PWR primary loop as the research subject.[Methods]Firstly,a predictive model for CRUD deposition and radioactive materials production distribution was established that encompassed CRUD deposition and radioactive material prediction.Then,the primary loop of PWR was simplified into five key nodes,i.e.,the core,soluble corrosion products,SG,corrosion particulates,and erosion particles,to address the generation,migration,deposition,and growth of CRUD based on the principles of mass transfer and water chemistry.The proportion of particles returning coolant was controlled by the purification efficiency in the erosion particle node.Finally,the activation of CRUD and the migration,deposition,and erosion of radioactive materials at each node were correspondingly considered on the basis of the activation theory,and the distribution of radioactive materials in the primary loop was obtained by establishing and solving the mass transport balance equations for each node.Based on this established model,a comprehensive

关 键 词：压水堆 污垢 放射性 钴 水化学 

分 类 号：TL99[核科学技术—核技术及应用]