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VVER REACTOR SAFETY ASSESSMENT IN RIA TYPE ACCIDENTS DURING POWER GRID REGULATING REGIMES

Work deals with RIA accidents safety assessment problem for VVER reactor, which is operating in normalized primary power grid frequency regulating regimes (FR). Frequency regulating regimes leads to turbine load variations and following continuously changing of main reactor facility parameters by feedbacks and regulators actions. Dynamic reactor conditions can be taking into account in safety assessment calculations and may needs in specialized methodical approach. Considered dynamical method application performs by mathematical model for initial event and FR combination detection which is worst for safety. Model includes the full scope of calculation and theoretical reactor dynamics analysis during FR transient processes. Model approbation is given by some safety analysis examples such as RIA type accidents: control rod ejection, uncontrollable rod group withdrawal and control rod drop with space power distribution perturbation.