PMK-2, the First Integral Thermal-Hydraulics Tests for the Safety Evaluation of WER-440/213 Nuclear Power Plants

摘要

The PMK-2 facility is a full-pressure thermal-hydraulic model of the primary and partly the secondary circuit of the WER-type units of Paks NPP. The facility was the first integral-type facility for WERs. The PMK-2 was followed later by the PACTEL (for WER-440), the ISB, and PSB for WER-1000. Since the startup of the facility in 1985, 55 experiments have been performed primarily in international frameworks with the participation of experts from 29 European and overseas countries forming a scientific school to better understand WER system behaviour and reach a high level of modelling of accident sequences. The ATHLET, CATHARE, and RELAP5 codes have been validated including both qualitative and quantitative assessments. The former was almost exclusively applied to the early phase of validation by integral experiments, while the quantitative assessments have been performed by the Fast Fourier Transform Based Method. Paper gives comprehensive information on the design features of PMK-2 facility with a special respect to the representativeness of phenomena, the experiments performed, and the results of the validation of ATHLET, CATHARE, and RELAP5 codes. Safety significance of the PMK-2 projects is also discussed.