ENERGETIKA

ISSN for PRINT: 0235-7208

For Online Access

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2005, Volume2

Issue 1

79 pages

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Egidijus Babilas
Laboratory of Nuclear Installation Safety, Lithuanian Energy Institute, Breslaujos 3, LT-44403 Kaunas, Lithuania

Egidijus Urbonavicius
Laboratory of Nuclear Installation Safety, Lithuanian Energy Institute, Breslaujos 3, LT-44403 Kaunas, Lithuania

Sigitas Rimkevicius
Laboratory of Nuclear Installation Safety, Lithuanian Energy Institute, Breslaujos 3, LT-44403 Kaunas, Lithuania

The Accident Localisation System (ALS) of the 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 the Ignalina NPP, ∼110 m³ of hydrogen is released to ALS compartments during the Maximum Design Basis Accident. If the volume concentration of hydrogen in the compartment reaches 4%, there is a possibility for a combustible mixture to appear. However, the flammability of hydrogen depends on the air and steam concentrations [1].
In the NPP hydrogen appears due to: 1) water radiolysis during normal operation and 2) steam interaction with zirconium (this mechanism is related to severe accidents).
In this paper, the calculation results of hydrogen distribution in the Ignalina NPP ALS during Maximum Design Basis Accident (MDBA) are presented.

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