The subject of the expert opinion was independent review of the station blackout analyses performed with the MAAP code and, where possible, to perform independent analyses, calculations and evaluations to support the expert opinion. In total 17 scenarios calculated by MAAP computer code were reviewed. Based on the review and 10 independent RELAP5 calculations of RCS response the conclusions on the acceptability of results obtained by MAAP were made.
F.30 Professional assessment of the situation
COBISS.SI-ID: 25228839For independent calculations of the Krško nuclear power plant reactor coolant system response, the RELAP5/MOD3.3 Patch 04 computer code was used, with the verified RELAP5 input deck. Because of the RELAP5 code selection, the independent calculations were performed up to the temperature of core damage. Based on the review and independent RELAP5 calculations of reactor coolant system response, conclusions were reached on the acceptability of simulation results of the MAAP code, obtained by the Krško NPP.
F.30 Professional assessment of the situation
COBISS.SI-ID: 25228583Steam explosion experiments revealed important differences in the energy conversion efficiency among the melts. The differences observed in the experiments are due to the differences in the jet fragmentation, the melt droplet solidification and the void production. These are limiting processes in the steam explosion phenomenon and have to be modelled adequately in fuel-coolant interaction codes. The thesis focuses on the modelling of the solidification effect which inhibits the fine fragmentation of the melt droplets and therefore influences directly the strength of the steam explosion. An improved solidification influence modelling approach suitable also for Eulerian fuel-coolant interaction codes was developed.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 2378852