GOTHIC MODEL OF BWR SECONDARY CONTAINMENT DRAWDOWN ANALYSES

Conference · Wed Oct 06 00:00:00 EDT 2004

OSTI ID:840367

Hansen, P N

This article introduces a GOTHIC version 7.1 model of the Secondary Containment Reactor Building Post LOCA drawdown analysis for a BWR. GOTHIC is an EPRI sponsored thermal hydraulic code. This analysis is required by the Utility to demonstrate an ability to restore and maintain the Secondary Containment Reactor Building negative pressure condition. The technical and regulatory issues associated with this modeling are presented. The analysis includes the affect of wind, elevation and thermal impacts on pressure conditions. The model includes a multiple volume representation which includes the spent fuel pool. In addition, heat sources and sinks are modeled as one dimensional heat conductors. The leakage into the building is modeled to include both laminar as well as turbulent behavior as established by actual plant test data. The GOTHIC code provides components to model heat exchangers used to provide fuel pool cooling as well as area cooling via air coolers. The results of the evaluation are used to demonstrate the time that the Reactor Building is at a pressure that exceeds external conditions. This time period is established with the GOTHIC model based on the worst case pressure conditions on the building. For this time period the Utility must assume the primary containment leakage goes directly to the environment. Once the building pressure is restored below outside conditions the release to the environment can be credited as a filtered release.

• Research Organization: ENERCON SERVICES INC., MOUNT ARLINGTON, NJ USA (US)
• Sponsoring Organization: none (US)
• OSTI ID: 840367
• Resource Relation: Conference: Americas Nuclear Energy Symposium (ANES 2004), Miami, FL (US), 10/03/2004--10/06/2004; Other Information: PBD: 6 Oct 2004
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
29 ENERGY PLANNING
POLICY AND ECONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CONTAINMENT
DRAWDOWN
EPRI
EVALUATION
FUEL STORAGE POOLS
HEAT EXCHANGERS
HEAT SOURCES
NUCLEAR ENERGY
SIMULATION
SPENT FUELS
THERMAL HYDRAULICS
THERMAL HYDRAULIC CODE
GOTHIC
BWR
MATHEMATICAL MODELING