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Simulation and analysis of pipe and vessel blowdown phenomena using RELAP5 and TRACE

Gurgacz S., Pawluczyk M., Niewiński G., Mazgaj P.

Journal of Power Technologies

2014

Vol. 94, nr 5

61--68

This paper presents the results of a pipe and vessel theoretical blowdown analysis in order to identify and assess rapid depressurization phenomena occurring during a Loss of Coolant Accident in a nuclear power plant. Calculations were performed in conditions similar to those in a reactor pressure vessel. Due to critical two-phase flow occurrence, RELAP5 mod 3.3. and TRACE v 3.0 system codes were used for this purpose and a computational model was built on the basis of available literature and implemented in MATLABr code. Finally, pipe depressurization results were compared to experimental results taken from the literature.