Optimization Research of SGTR Procedure for Nuclear Power Plant

Nuclear power plant mitigates SGTR accident by emergency operating procedure (EOP). SGTR analysis results show that after the operator opens the pressurizer relief valve to decrease reactor coolant system pressure in the process of accident mitigation, the safety injection flow increases quickly causing the pressurizer level increasing substantially, there may be a potential danger. The purpose of this paper is to better mitigate the SGTR accident, so that the pressurizer level will not rise too high during the accident mitigation process to keep the nuclear power plant safe. By optimizing the EOP mitigation steps, cutting off a row of safety injection in advance, and analyzing and calculating the accident mitigation process of the optimized EOP, the final results show that the maximum level of the pressurizer decreases, which reduces the risk of excessive level of the pressurizer, which provides a basis for the follow-up improvement of the nuclear power plant procedure.