Assessment of RELAP5/MOD2 against natural circulation experiments performed with the REWET-III facility

Technical Report · Wed Apr 01 00:00:00 EST 1992

OSTI ID:5586936

Hyvaerinen, J; Kervinen, T ^[1]

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1. Valtion Teknillinen Tutkimuskeskus, Helsinki (Finland). Nuclear Engineering Lab.

Natural circulation experiments carried out in the REWET-III facility in 1985 have been used for RELAP5/MOD2 assessment. The REWET-III facility is a scaled-down model of VVER-440 type reactors. The facility consists of a pressure vessel in which the downcomer is simulated with an external pipe assembly, hot and cold legs with loop seals and a horizontal steam generator. The volume scaling factor compared to the reference reactor is 1:2333. The present paper summarizes the experiences gained in the RELAP5/MOD2 calculations of selected REWET-III single- and two-phase natural circulation experiments. The code's ability to represent the main phenomena of experiments in both cases was satisfactory.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (United States). Office of Nuclear Regulatory Research; Valtion Teknillinen Tutkimuskeskus, Helsinki (Finland). Nuclear Engineering Lab.
• Sponsoring Organization: USNRC; Nuclear Regulatory Commission, Washington, DC (United States)
• OSTI ID: 5586936
• Report Number(s): NUREG/IA-0059; ON: TI92013004
• Country of Publication: United States
• Language: English

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