基于压水堆堆芯物理分析软件Bamboo-C的VVER-1000工业确认研究  

Research on Industrial Validation of VVER-1000 Based on PWR Core Physics Analysis Code Bamboo-C

作　　者：杨灏哲 何旭东 王昆鹏 万承辉 吴宏春[1] Yang Haozhe;He Xudong;Wang Kunpeng;Wan Chenghui;Wu Hongchun(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China;Nuclear and Radiation Safety Center,MEE,Beijing,100082,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [2]生态环境部核与辐射安全中心,北京100082

出　　处：《核动力工程》2024年第4期9-16,共8页Nuclear Power Engineering

摘　　要：本研究旨在实现对VVER-1000型核反应堆的精确物理分析,基于西安交通大学自研的先进压水堆堆芯物理分析软件Bamboo-C,进行了深入的方法学研究。研究内容包括:在组件计算方面,研究了基于构造实体几何的六角形输运计算方法及重反射层的精细建模技术;在堆芯计算方面,研究了保角变换与非线性迭代策略结合的六角形节块中子扩散计算法。基于Bamboo-C软件对某VVER-1000机组连续3个燃料循环启动物理试验和功率运行进行了建模计算,并与实测数据进行了对比分析。结果表明:①启动物理试验中,临界硼浓度的误差均值为−5.0ppm(1ppm=10^(-6));慢化剂温度系数与等温温度系数的误差均值分别为0.3 pcm/K和0.9 pcm/K(1pcm=10^(-5));硼微分价值的误差均值为−5.0%;控制棒价值的误差均值为−7.8%;②功率运行中,3个循环临界硼浓度的误差均值分别为−2.3ppm、−18.9ppm和−7.8ppm;3个循环的堆芯功率分布误差的均值为−0.010(组件相对功率大于1)和0.012(组件相对功率小于1)。因此,Bamboo-C软件对VVER-1000机组堆芯关键物理量的计算误差均满足工业限值要求,具备工程应用的能力。This study aims to achieve precise physical analysis of VVER-1000 nuclear reactors.Based on Bamboo-C,an advanced PWR core physical analysis software developed by Xi'an Jiaotong University,a thorough methodological study is carried out.The research encompasses:in the aspect of assembly calculation,methods based on Constructive Solid Geometry(CSG)for hexagonal transport calculations and detailed modeling techniques for heavy reflector layers were studied;in core calculation,a method combining conformal mapping and nonlinear iterative strategies for hexagonal fuel assembly neutron diffusion was investigated.Using Bamboo-C,modeling calculations were performed for three consecutive fuel cycles of start-up physical experiments and power operations of a specific VVER-1000 unit,followed by a comparative analysis with actual measured data.The results indicate:①In the start-up physical tests,the average error of critical boron concentration is−5.0ppm(1ppm=10^(-6));the average errors of the moderator temperature coefficient and the isothermal temperature coefficient are 0.3 pcm/K and 0.9 pcm/K(1pcm=10^(-5)),respectively;the average error of the boron worth is−5.0%;and the average error in control rod worth is−7.8%.②During power operations,the average errors of critical boron concentration for three cycles were−2.3ppm,−18.9ppm,and−7.8ppm,respectively;the average errors in the core power distribution for the three cycles were−0.010(for assembly relative power greater than 1)and 0.012(for assembly power less than 1).Therefore,Bamboo-C software meets the industrial threshold requirements for calculation errors of key physical quantities in the VVER-1000 reactor core,demonstrating its capability for engineering application.

关 键 词：Bamboo-C软件 VVER-1000 工业确认 

分 类 号：TL329[核科学技术—核技术及应用]