Comparative analysis of ECCS calculation models in program complex KORSAR/GP

Latkin Dmitrii, PhD Petkevich Ivan

29th Symposium of AER on VVER Reactor Physics and Reactor Safety (2019, Energoland, Mochovce NPP, Slovakia)
reactor dynamics and safety analysis


Passive ECCS (emergency cooling core system) is one of the most important system of VVER reactors. KORSAR / GP software can use different calculation models for the same elements. In ECCS system different models can be used for modeling of ECCS volume and pipelines. ACCUM element (“hydraulic accumulator”) was developed exactly as ECCS volume. The model of the ACCUM element was verified based on the results of experiments on integral thermo-hydraulic stands. This model has been used during very long time in real safety analysis. The latest versions of the KORSAR / GP software package make it possible to use the SLVES (pressure vessel) calculation element. The mathematical model of SLVES includes a wider list of physical phenomena, to calculate the volume of the ECCS. This work is devoted to testing various models of the passive part of the ECCS.

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