Modelling of Severe Accident Phenomena in Level 2 PSA for Paks NPP
A Level 2 PSA study has recently been performed for the Paks NPP in Hungary. The probabilistic assessment of the containment loads is illustrated on the example of hydrogen combustion. Depending on the composition of the mixture the combustion mechanism could be either a turbulent deflagration or a deflagration-to-detonation transition (DDT). Hydrogen ignition as well as combustion and the associated pressure loads are described in probabilistic terms. The failure probability of the containment is calculated from pressure load and fragility distributions.
KeywordsPressure Load Fragility Curve Probability Density Distribution Hydrogen Combustion Severe Accident
Unable to display preview. Download preview PDF.
- 1.MAAP4 — Modular Accident Analysis Program for LWR Power Plants, Volumes 1-4, Research Project 3131-02 May 1994, Prepared by Fauske Associates, Inc. for EPRI, Rev. 0.0Google Scholar
- 2.Téchy, Zs., Lajtha G. et al A7. Probabilistic treatment of physical phenomena, Level 2 PSA for Paks NPP, in Hungarian, VEIKI Report 21.11-215/A7, 2002.Google Scholar
- 3.G. Pascal: New program for hydrogen adiabatic burn calculation WENX 23/09/1998 Westinghouse Energy System Europe S.A.Google Scholar
- 4.Téchy, Zs., Lajtha, G., Bareith, A. et al: Probabilistic evaluation of containment event trees. Level 2 PSA for Paks NPP, in Hungarian, VEIKI Report 21.11-214/A8-A9, 2003.Google Scholar
- 5.Sherman M and Berman M, The Possibility of Local Detonations During Degraded-Core Accidents in the Bellefonte Nuclear Power Plant, Nuclear Technology 81 (1988) p.63–77Google Scholar
- 6.Jorma Arros: Paks Containment Overpressure Study ABS Consulting, 2002, Paks Contract No. 1131200600Google Scholar
- 7.Ang, M. L., Coe, I. M., Taylor, K. L.: A methodology for the evaluation of the likelihood of hydrogen combustion during severe accidents in water-cooled nuclear power plants, NNC C9070/REP/002, 1995Google Scholar
- 8.Landau, L., Lifsic, E. Theoretical Physics VI., Hydrodynamics, Moscow, 1963Google Scholar