RELAP5铅铋快堆模型拓展及验证

为研究铅铋快堆瞬态热工水力特性，对RELAP5程序进行二次开发，添加铅铋合金（LBE）物性模型和液态金属流动换热模型，并与NACIE-UP和CIRCE-ICE台架的实验结果进行对比。计算结果表明：NACIE-UP台架稳态流量和温度相对误差在2%以内，瞬态相对误差不超过5%，与其他系统程序CATHARE、ATHLET、RELAP5-3D、RELAP5/MOD3.3(modified)相比，本文程序的相对偏差不超过10%；CIRCE-ICE台架稳态流量和温度相对误差在2%以内，瞬态相对误差不超过10%。本文程序满足反应堆系统热工水力分析程序精度要求，可作为铅铋快堆安全分析的有效工具。

RELAP5 Modification and Verification for Lead-bismuth Fast Reactor

To study the transient thermal-hydraulic characteristics of the lead-bismuth fast reactor, the system thermal-hydraulic analysis code RELAP5 was modified with lead-bismuth eutectic (LBE) properties and heat transfer models. Verification using the NACIE-UP facility and the CIRCE-ICE facility was completed. The calculation results show that the steady-state relative error and transient relative error for the NACIE-UP facility are within 2% and 5% respectively. And compared with other system thermal-hydraulic analysis codes, such as CATHARE, ATHLET, RELAP5-3D and RELAP5/MOD3.3 (modified), the relative deviation is within 10%. The steady-state relative error and transient relative error for the CIRCE-ICE facility are within 2% and 10% respectively. This code can meet the accuracy requirements of thermal-hydraulic analysis code of reactor system, and can be used as an effective tool for safety analysis of lead bismuth fast reactor.