Method for automatically stopping coolant pump under reactor coolant loss accident condition

Abstract

The invention belongs to a coping method for pressurized water reactor nuclear power station accidents and especially relates to a method for automatically stopping a coolant pump under the reactor coolant loss accident condition. The method comprises the following steps: the step 1) triggering a safe injection signal and a reactor coolant pump inlet and outlet pressure difference low logic; and the step 2) when the safe injection signal coexists with the condition of reactor coolant pump inlet and outlet low pressure difference, triggering the reactor coolant pump to stop operation. The method has the advantages that the method can realize automatic shutdown of the reactor coolant pump before reactor core deterioration under the LOCA condition, and the time when operators do not need to intervene the accident is prolonged greatly.

Description

technical field [0001] The invention belongs to a method for responding to an accident in a pressurized water reactor nuclear power plant, in particular to a method for automatically shutting down a coolant pump under the condition of a reactor coolant loss accident. Background technique [0002] The accident analysis results of existing nuclear power plants show that in the event of a loss of reactor coolant accident (LOCA), the reactor coolant in the primary circuit is rapidly lost through the breach, the pressure and water load in the primary circuit are reduced, and the reactor is triggered by the low pressure signal of the voltage regulator. In case of emergency shutdown, the low-low signal of the voltage regulator triggers the safety injection. With the continuous loss of water content in the primary circuit, the reactor core is gradually exposed, and the reactor coolant pump needs to be shut down as soon as possible to prevent the core condition from deteriorating and...

AI Technical Summary

Problems solved by technology

[0003] Domestic active nuclear power plants do not have an automatic shutdown reactor coolant pump signal for LOCA conditions, so the operator needs to manually shut down the reactor coolant pump as soon as possible after judging that LOCA has occurred to prevent the core from deteriorating

Due to the short time interval from the occurrence of LOCA to the shutdown of the reactor coolant pump, the requirements for the operator are relatively high, and misoperation is prone to occur

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