Simulation of Hydrogen Distribution in Ignalina NPP ALS Compartments During BDBA

Conference · Sat Jul 01 00:00:00 EDT 2006

OSTI ID:20997050

Babilas, Egidijus; Urbonavicius, Egidijus; Rimkevicius, Sigitas ^[1]

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1. Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas (Lithuania)

Accident Localisation System (ALS) of Ignalina NPP is a 'pressure suppression' type confinement, which protects the population, employees and environment from the radiation hazards. According to the Safety Analysis Report for Ignalina NPP {approx}110 m{sup 3} of hydrogen is released to ALS compartments during the Maximum Design Basis Accident. However in case of beyond design basis accident, when the oxidation of zirconium starts, the amount of generated hydrogen could be significantly higher. If the volume concentration of hydrogen in the compartment reaches 4%, there is a possibility for a combustible mixture to appear. To prevent the possible hydrogen accumulation in the ALS of the Ignalina NPP during an accident the H{sub 2} control system is installed. The results of the performed analysis derived the places of the possible H{sub 2} accumulation in the ALS compartments during the transient processes and assessed the mixture combustibility in these places for a beyond design basis accident scenario. Such analysis of H{sub 2} distribution in the ALS of Ignalina NPP in case of BDBA was not performed before. (authors)

• Research Organization: The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
• OSTI ID: 20997050
• Resource Relation: Conference: 14. International conference on nuclear engineering (ICONE 14), Miami - Florida (United States), 17-20 Jul 2006; Other Information: Country of input: France
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BUILDUP
CONFINEMENT
CONTROL SYSTEMS
DESIGN BASIS ACCIDENTS
DISTRIBUTION
ENVIRONMENT
HYDROGEN
IGNALINA-1 REACTOR
IGNALINA-2 REACTOR
MIXTURES
OXIDATION
PERSONNEL
POPULATIONS
PRESSURE SUPPRESSION
RADIATION HAZARDS
SAFETY ANALYSIS
SIMULATION
TRANSIENTS
ZIRCONIUM