热工水力模型与堆芯熔化模型的耦合技术研究  

Research on Coupling Technology between Thermal-hydraulic Model and Core Melting Model

作　　者：景兴天 曹瑛 林萌[1] JING Xing-tian;CAO Ying;LIN Meng(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《计算机仿真》2023年第5期364-368,共5页Computer Simulation

基　　金：国防科工局核能开发科研项目(2206030312021515)。

摘　　要：为扩展全范围模拟机的仿真范围至严重事故阶段,以国产化自主开发的一体化软件包COSINE为例,对其热工水力系统程序cosFLOW与严重事故分析程序csoSA的耦合技术进行研究。首先使用cosFLOW计算事故的早期现象,当达到严重事故状态时,再启用cosSA来模拟事故中晚期。着重研究堆芯升温熔化模型的耦合过程,分析了堆芯传热计算并选取合理的耦合参数,采用耦合后的一体化程序对PHEBUS/B9+ISP-28堆芯熔解国际标准题进行验证计算,并最后应用于百万千瓦级压水堆的中破口失水事故仿真计算。验证结果表明耦合后的程序的计算结果与实验数据拟合较好,且应用于核电厂中破口失水事故计算时其堆芯温度与总产氢量的发展趋势合理。耦合后的堆芯模型能合理地预测堆芯的氧化升温和加热熔化进程,成功地实现了计算范围由设计基准事故扩展至严重事故阶段的目标。另外cosFLOW与cosSA共用一套堆芯节点划分且无重复模型,因此其堆芯模型的耦合过渡无任何参数阶跃变化且自然平滑。In order to extend the simulation range of full-scope simulator(FSS)to severe accident(SA)stage,this paper used the domestically developed integrated software package COSINE as an example to study the coupling technology between its thermal-hydraulic code cosFLOW and SA code cosSA.Firstly,cosFLOW was initiated to cal-culate early stage of an accident,and when the coupling conditions were met,the coSA was called to simulate the middle-late terms.This paper mainly focuses on exploring the coupling process of core heating and melting model.It analyzed the core heat transfer model and selected correct coupling parameters.Then,the coupled integrated code was employed to calculate a core melting international benchmark PHEBUS/B9+ISP-28 to verify,and finally applied to simulate a mid-break of loss of coolant accident(MB-LOCA)of a million-kilowatt pressurized water reactor(PWR).The verification turns out that the calculation results of coupled integrated code fit well with the experimental data.The application results of a MB-LOCA of the PWR show that the development trends of core tem-perature and hydrogen generation are reasonable;Therefore,the coupling of core model of cosFLOW and cosSA can reasonably predict the process of fuel rod oxidation,heating and melting,so that the calculation range can be suc-cessfully extended from the design-based accident(DBA)to the SA field.In addition,the cosFLOW and the cosSA share a set of core node partitions and have no duplicate models,so the coupling transition of their core models has no parameter step changes and is naturally smooth.

关 键 词：堆芯传热 模型耦合 严重事故 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]