MELCOR 1.8.2 assessment: Surry PWR TMLB` (with a DCH study)

Technical Report · Tue Feb 01 00:00:00 EST 1994

DOI:https://doi.org/10.2172/142535· OSTI ID:142535

Kmetyk, L N; Cole, Jr, R K; Smith, R C; Summers, R M; Thompson, S L

MELCOR is a fully integrated, engineering-level computer code, being developed at Sandia National Laboratories for the USNRC. This code models the entire spectrum of severe accident phenomena in a unified framework for both BWRs and PWRs. As part of an ongoing assessment program, the MELCOR computer code has been used to analyze a station blackout transient in Surry, a three-loop Westinghouse PWR. Basecase results obtained with MELCOR 1.8.2 are presented, and compared to earlier results for the same transient calculated using MELCOR 1.8.1. The effects of new models added in MELCOR 1.8.2 (in particular, hydrodynamic interfacial momentum exchange, core debris radial relocation and core material eutectics, CORSOR-Booth fission product release, high-pressure melt ejection and direct containment heating) are investigated individually in sensitivity studies. The progress in reducing numeric effects in MELCOR 1.8.2, compared to MELCOR 1.8.1, is evaluated in both machine-dependency and time-step studies; some remaining sources of numeric dependencies (valve cycling, material relocation and hydrogen burn) are identified.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: Nuclear Regulatory Commission, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 142535
• Report Number(s): SAND-93-1899; ON: DE94008819; TRN: 94:006573
• Resource Relation: Other Information: PBD: Feb 1994
• Country of Publication: United States
• Language: English

Related Subjects

22 NUCLEAR REACTOR TECHNOLOGY
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
REACTOR ACCIDENTS
COMPUTERIZED SIMULATION
SURRY-1 REACTOR
M CODES
THEORETICAL DATA
BLACKOUTS
TRANSIENTS
SENSITIVITY ANALYSIS
COMPARATIVE EVALUATIONS
MATHEMATICAL MODELS