RELAP5/MOD3 Subcooled Boiling Model Assessment (NUREG/IA-0025)
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Date Published: May 1998
A.S. Devkin and A.S. Podosenov
Nuclear Safety Institute
Russian Research Centre
Kurchatov Square, 1
Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Code Application and Maintenance Program (CAMP)
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555
This report presents the assessment of the RELAP5/Mod3 (5m5 version) code subcooled boiling process model, which is based on a variety of experiments. The accuracy of the model is confirmed for a wide range of regime parameters for the case of uniform heating along the channel. The condensation rate is rather underpredicted, which may lead to considerable errors in void fraction behavior prediction in subcooled boiling regimes for nonuniformly or unheated channels.