 ISSN 0235-7208 |
2009 m. Nr. 3 Simulation of hydrogen distribution at the Ignalina NPP confinement during BDBA
The accident localisation system (ALS) of the Ignalina NPP is a “pressure suppression” type confinement which protects the population, employees and environment from 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. However, in case of a beyond-design basis accident when zirconium oxidation 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, a H2 control system is installed. The analysis revealed places of a possible H2 accumulation in the ALS compartments during transient processes and assessed the mixture combustibility in these places for a beyond-design basis accident scenario. Such analysis of H2 distribution in the ALS of the Ignalina NPP in case of BDBA had never been performed. Keywords: confinement, hydrogen, loss of coolant accident |
Numeriai:
2011 - T.57 Nr.1, Nr.2, Nr.3, Nr.4 2010 - T.56 Nr.1, Nr.2, Nr.3-4 2009 - T.55 Nr.1, Nr.2, Nr.3, Nr.4 2008 - T.54 Nr.1, Nr.2, Nr.3, Nr.4 2007 - T.53 Nr.1, Nr.2, Nr.3, Nr.4 2006 Nr.1, Nr.2, Nr.3, Nr.4 2005 Nr.1, Nr.2, Nr.3, Nr.4 2004 Nr.1, Nr.2, Nr.3, Nr.4 2003 Nr.1, Nr.2, Nr.3, Nr.4 2002 Nr.1, Nr.2, Nr.3, Nr.4 2001 Nr.1, Nr.2, Nr.3, Nr.4 |