The procedures of validation and cross-verification the newly developed computational code ROK/B are described. main problem solved using is substantiation by calculation coolant density in spent fuel pool (SFP) temperature regime assemblies during a protracted shutdown cooling systems (break supply water). In addition to above, it possible use carry out an accident with discharge from SFP simu...

In this paper the phase formation and mechanical properties of VVER-type reactor pressure vessel (RPV) steels with various Ni (1.57–5.95 wt.%) Mn (0.03–0.76 content after neutron irradiation up to fluences in range (53–120) × 1022 n/m2 at 400 °C were studied. The possibility carbonitride under these conditions is shown. case sufficient (>1.5 (>0.3 Ni-Si-Mn precipitates observed. Their che...

This study was undertaken to demonstrate capabilities of the pin-by-pin model used by the BARS code and to understand various effects of intra-assembly pin-by-pin representation of fuel power, bumup and temperature in calculational analysis of light water reactor rod ejection accidents (LWR REAs). Effects of pin-by-pin fuel power and bumup representation were investigated on the basis of calcul...

The paper considers the efficiency and possibility of implementing into operational practice VVER-1000 power units campaign extension mode at sliding pressure second circuit. history research Russian nuclear scientists in terms extending VVER reactors is considered. It shown that reducing fresh steam within permissible limits will release additional reactivity due to temperature effect generate...