Design of Severe Accident Management Systems for Beyond Design Basis External Hazards at Paks NPP

[+] Author and Article Information
Tamas Janos Katona

ASME Member, MVM Nuclear Power Plant Paks Ltd, H-7031 Paks P.O. Box 71

Andras Vilimi

University of Pécs, Breuer Marcell Doctoral School of Architecture, H-7624 Pécs, Boszorkány út 2, Hungary

1Corresponding author.

ASME doi:10.1115/1.4037715 History: Received September 25, 2016; Revised August 13, 2017


Paks Nuclear Power Plant identified the post-Fukushima actions for mitigation and management of severe accidents caused by external events that include updating of some hazard assessments, evaluation of capacity / margins of existing severe accident management facilities, and construction of some new systems and facilities. In all cases, the basic question was, what level of margin has to be ensured above design basis external hazard effects, and what level of or hazard has to be taken for the design. Paks Nuclear Power Plant developed certain an applicable in the practice concept for the qualification of already implemented measures and design the new post-Fukushima measures that is outlined in the paper. The concept is based on the generalization of the procedure and assumptions used in the definition of acceptable margins for seismic loads, analysis of the steepness of the hazard curves and features of the hazards. Justification of the definition of exceedance probability of the design basis effects for the design of severe accident management systems is given on the basis of first order reliability theory. The application of the concept is presented on several practical examples.

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