Assessment of RELAP5/MOD3 off-take model for application to AP600 analysis
- Nuclear Regulatory Commission, Washington, DC (United States)
- Pennsylvania State Univ., University Park, PA (United States)
The Westinghouse AP600 advanced pressurized water reactor uses a surge-line geometry that differs from that found in existing Westinghouse plants. The off-take is located in the hot leg at a 55-deg angle and has an initial slope of 24 deg. Typical geometries found in other Westinghouse reactors would have the surge line attached to the horizontal run of the hot leg and entering at a location from the top. A concern over the off-take and surge-line originates because of the impact that phase separation effects would have on system depressurization and mass inventory during a small break loss-of-coolant-accident (LOCA). High-quality flow out the branch of the off-take has a greater depressurization rate and less mass loss than low-quality flows. This paper evaluates the current off-take capabilities of RELAP5 and assesses whether it is sufficient to model the expected behavior in the AP600 surge-line off-take. The existing data base was reviewed, and the need for new data was evaluated.
- OSTI ID:
- 7129039
- Report Number(s):
- CONF-931160-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 69; Conference: American Nuclear Society (ANS) winter meeting, San Francisco, CA (United States), 14-18 Nov 1993; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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