Investigation of VVER-1000 rod ejection accident according to the Phenomenon Identification and Ranking Tables for PWR

The analysis was focused on evaluation of the following parameters according to PIRT: relative power in the reactor core and rejected fuel assembly, inserted reactivity, moderator properties (density and temperature), and inner/outer temperature of the heat structure. Nominal power of 100% and the control rod ejection time of 0.1 s were considered. The inserted reactivity has reached 0.45$ and the maximum power in the reactor core has risen to 179.7%.