In 2012 on the large-scale thermalphysic PSB-VVER facility modelling of three different type accidents is executed:

- Guillotine rupture of the pipeline on a reactor inlet;

- A small leak from “the cold” pipeline;

- Rupture of pressurizer surge line.

In experiments work of passive safety systems of new projects of NPP with RU VVER in the conditions of loss of all sources of an alternating current was modelled.

The purpose of experiments was research of influence of new passive safety systems on a temperature condition of a fuel cladding. On the basis of the received experimental data verification of the Russian system codes TRAP-KS, KORSAR/GP and SOCRAT is executed.

In paper the basic results of researches are presented.

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