A Methodology for the Estimation of the Radiological Consequences of a LOCA Event

A. Keresztúri (Mr), AEMI Nuclear Energy Engineering Office Company Limited

26th Symposium of AER on VVER Reactor Physics and Reactor Safety (2016, Helsinki, Finland)
Reactor dynamics and safety analysis

Abstract

A METHODOLOGY FOR THE ESTIMATION OF THE RADIOLOGICAL CONSEQUENCES OF A LOCA EVENTAndrás Keresztúri, Ádám Brolly, István Panka, Tamás Pázmándi, István Trosztel MTA EK, Centre for Energy Research, Hungarian Academy of Sciences H-1525 Budapest 114, P.O. Box 49, Hungary andras.kereszturi@energia.mta.huABSTRACTFor calculation of a the radiological consequences of LOCA events a set of various computer codes modeling the corresponding physical processes, disciplines and their appropriate subsequent connections are necessary. For demonstrating the methodology applied in MTA EK, the LOCA event at a shut down reactor – when only limited configuration of ECCS is available – was selected. In this special case, partial fission gas release from a number of fuel pins is obtained from the analyses. The presentation overviews the the initiating event, the corresponding thermal hydraulic calculations, the physical processes, the necessary models and computer codes, their connections, the applied conservative assumptions and the B+U evaluation applied for characterizingthe pin power and burnup distribution in the core, the fuel behavior processes, the calculations applied to predict whether the fuel pins aregetting in-hermetic, the results of the activity transport and dose calculations.26th Symposium of AER on VVER Reactor Physics and Reactor Safety 43 10 – 14 October 2016, Helsinki, Finland

Presentation / full paper