| Research on the steam–gas pressurizer model with Relap5 code |
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| 摘 要： | Steam–gas pressurizers are self-pressurizing, and since steam and noncondensable gas are used to sustain their pressure, they experience very complicated thermal–hydraulic phenomena owing to the presence of the latter. A steam–gas pressurizer model was developed using Relap5 code to investigate such a pressurizer's thermal–hydraulic characteristics.The important thermal–hydraulic processes occurring in the pressurizer model include bulk flashing, rainout, wall condensation with noncondensable gas, and interfacial heat and mass transfer. The pressurizer model was verified using results from insurge experiments performed at the Massachusetts Institute of Technology. It was found that noncondensable gas was one of the important factors governing the pressure response, and the accuracy of the developed model would change with different mass fractions and types of noncondensable gas.
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Research on the steam-gas pressurizer model with Relap5 code |
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| Authors: | Xi-Zhen Ma Hai-Jun Jia Yang Liu |
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| Affiliation: | Institute of Nuclear and New Energy Technology,Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| Abstract: | Steam-gas pressurizers are self-pressurizing,and since steam and noncondensable gas are used to sustain their pressure,they experience very complicated thermal-hydraulic phenomena owing to the presence of the latter.A steam-gas pressurizer model was developed using Relap5 code to investigate such a pressurizer's thermal-hydraulic characteristics.The important thermal-hydraulic processes occurring in the pressurizer model include bulk flashing,rainout,wall condensation with noncondensable gas,and interfacial heat and mass transfer.The pressurizer model was verified using results from insurge experiments performed at the Massachusetts Institute of Technology.It was found that noncondensable gas was one of the important factors governing the pressure response,and the accuracy of the developed model would change with different mass fractions and types of noncondensable gas. |
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| Keywords: | Relap5 code Noncondensable gas Heat and mass transfer Steam-gas pressurizer Condensation |
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