Simulation of pressurizer tests with noncondensable gases using modified condensation heat transfer correlation in the RELAP5/MOD2 code

Conference · Wed Nov 01 04:00:00 EST 1989 · Transactions of the American Nuclear Society; (United States)

OSTI ID:5486892

Grant, S E; Hassan, Y A ^[1]

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1. Texas A M Univ., College Station (USA)

The presence of noncondensable gas in a condensing vapor significantly decreases the condensation heat transfer and thus noticeably affects the pressurizer response. The pressure response to pressurized water reactor transients is important in determining the timing of the safety system responses. In accidents, nitrogen gas can be discharged into the reactor system from the accumulator after the water inventory is exhausted. The purpose of this study is to model the Massachusetts Institute of Technology (MIT) pressurizer insurge transients, in which the vapor region contains steam mixed with nitrogen gas, using the RELAP5/MOD thermal-hydraulic code. The RELAP5/MOD2 predictions showed poor agreement with the experimental data. A revised factor to account for the degradation of the condensation due to the presence of noncondensable gas was developed. Reasonable agreement of the revised code predictions with the data was achieved.

• OSTI ID: 5486892
• Report Number(s): CONF-891103--
• Conference Information: Journal Name: Transactions of the American Nuclear Society; (United States) Journal Volume: 60
• Country of Publication: United States
• Language: English

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COMPUTERIZED SIMULATION
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