Calculation of Equipment Environmental Conditions in NPP Krsko Auxiliary Building after Accident

Električna oprema u nuklearnim postrojenjima mora moći izdržati teške uvjete koji mogu nastati zbog akcidenata i prema tim se kriterijima odabire. Analiza uvjeta koji vladaju u pomoćnoj i među-zgradi NEK-a nakon akcidenta provedena je na izrađenim modelima za program MELCOR. Rezultati termo-hidrauličkih proračuna uspoređeni su s rezultatima dobivenim programom GOTHIC. Usporedba je pokazala mnogo bolje poklapanje između rezultata dobivenih ovim dvama programima za slučaj među-zgrade. Potom su provedene analize curenja sadržaja iz zaštitne zgrade analiza curenja vodika za pomoćnu zgradu te analiza curenja vodika i radioaktivnih plinova za među-zgradu.Electric equipment in nuclear power plants must be able to endure harsh environmental conditions that may occur during accidents in order to mitigate its consequences. An analysis of environmental conditions following postulated accidents in NEK Auxiliary and Intermediate building was performed using MELCOR computer code. Results of thermal-hydraulic calculations were compared with the ones obtained from GOTHIC computer code in order to validate models. Matching of the results of two codes was much better in the case of IB than in the case of AB. The next step was to perform an analysis of containment leakage of hydrogen and radioactive effluents in AB and IB