AN ASSESSMENT OF CRITICAL FLOW MODEL IN RELAP5
A subcooled critical flow experiment with nozzle of D=2.0mm and L=10mm has been carried out at steady- state condition covering wide range of pressure. In the present study an assessment of the critical flow model of RELAP5/MOD3.2 was made by comparison of the code predictions with the data from the present experiment and others, including those at Super Moby- Dick facility under steady-state condition with nozzle of D=15.48mm and L=150mm, those at ROSA- Ⅳ/LSTF SB-LOCA test with orifice of D=22.5mm, and those at Marviken large scale facility with shorter nozzles of D=200-509mm and L/D of 0.33-3.72. In the code calculations the thermal non-equilibrium and equilibrium options were tested for Super Moby-Dick data, and choking and non-choking options were tested for ROSA-Ⅳ/LSTF SB-LOCA data. In addition, some sensitivity calculations for the nodes of nozzle simulation were made. It is concluded that the options of thermal equilibrium/non-equilibrium and choking/non-choking are closely relative to the upstream condition and break geometry, and have great effects on the prediction results, suggesting the importance of users factor.
Chen Yuzhou, Yang Chunsheng
China Institute of Atomic Energy
国际会议
上海
英文
495-502
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）