LOCUST软件再淹没模型验证与不确定性研究  

Verification and Uncertainty Evaluation of LOCUST Reflood Model

作　　者：许荣栓 夏航 徐财红 贺东钰 王婷 厉井钢 Xu Rongshuan;Xia Hang;Xu Caihong;He Dongyu;Wang Ting;Li Jinggang(China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen,Guangdong,518000,China)

机构地区：[1]中广核研究院有限公司,广东深圳518000

出　　处：《核动力工程》2024年第4期111-117,共7页Nuclear Power Engineering

摘　　要：再淹没阶段是压水堆发生大破口失水事故(LBLOCA)后的重要阶段,为了评估系统软件LOCUST对该阶段的模拟能力,开展了LOCUST软件再淹没模型验证与不确定性研究工作。基于RBHT实验台架实验结果对LOCUST软件再淹没模型进行了验证;同时采用响应曲面法对再淹没模型开展了不确定性分析,将壁面-液膜沸腾换热系数、壁面-汽膜沸腾换热系数和界面摩擦系数作为输入参数,采用响应曲面法获得了RBHT实验台架实验段3个高度下加热棒表面最高温度的响应函数。验证计算结果与实验结果总体趋势符合良好,最高温度偏差在40 K以内。基于响应曲面法计算结果可知,95%的概率和95%的置信度下加热棒表面3个高度的最高温度最大偏差在20 K左右;当3个输入参数无量纲因子分别为1.951、1.233、0.1条件下,3个高度的最高温度计算值与实验值基本一致。The reflood stage is an important stage after a large break loss of coolant accident(LBLOCA)in pressurized water reactor.In order to evaluate the simulation ability of the system code LOCUST,the verification and uncertainty research of LOCUST reflood model are carried out.Based on the experimental results of RBHT test bench,the LOCUST reflood model is verified.At the same time,the uncertainty of the reflood model is analyzed by response surface method,and the response function of the maximum temperature of the heating rod surface at three heights of RBHT test section is obtained by response surface method with the wall-liquid film boiling heat transfer coefficient,wall-vapor film boiling heat transfer coefficient and interface friction coefficient as input parameters.The calculated results are in good agreement with the experimental results,and the maximum temperature deviation is within 40 K.Based on the calculation results of response surface method,the maximum deviation of the maximum temperature of the heating rod surface at three heights is about 20 K with 95%probability and 95%confidence.Meanwhile,the highest temperature values calculated for the three heights are basically consistent with the experimental values when the dimensionless factors of the three input parameters are 1.951,1.233,and 0.1,respectively.

关 键 词：再淹没 LOCUST RBHT 不确定性 

分 类 号：TL364[核科学技术—核技术及应用]