A method for nuclear power plants to deal with multi-channel liquid level signal faults of evaporators

Abstract

The invention relates to the technical field of nuclear power automatic control, in particular to a method for a nuclear power plant to deal with multi-channel liquid level signal failures of evaporators. The method for the nuclear power plant to deal with the multi-channel liquid level signal failure of the evaporator is: generate the evaporator liquid level fault signal; generate the total signal of the evaporator liquid level fault; generate the signal that the temperature of the hot section is less than the set limit value; generate the cooling mode signal; The temperature of the hot section is less than the set limit signal and the cooling mode signal to perform an AND operation to generate a cooling blocking signal; the total signal of the evaporator liquid level fault is blocked by the blocking logic and the cooling blocking signal to generate an evaporator Liquid level fault shutdown signal; evaporator liquid level fault shutdown signal and other shutdown signals generate a total shutdown signal to execute the shutdown. The invention can automatically trigger the shutdown protection function, and at the same time prevent the reactor unit from accidentally triggering the shutdown protection function when the cooling mode is inaccurately judged due to an evaporator liquid level signal failure, and is safer and more reliable.

Description

technical field [0001] The invention relates to the technical field of nuclear power automatic control, in particular to a method for a nuclear power plant to deal with multi-channel liquid level signal failures of evaporators. Background technique [0002] The evaporator uses the heat exported by the reactor through the coolant of the primary circuit to generate the steam required by the steam turbine of the secondary circuit, and is the pivotal equipment connecting the primary and secondary circuits of the nuclear power plant. The evaporator liquid level is an important physical parameter involved in reactor protection, and it is usually designed with 4 channels of redundant liquid level signals. [0003] At present, the commonly used method to trigger shutdown protection is: use the second largest or second smallest value of the evaporator liquid level signals of the four channels as the liquid level effective value, and trigger the reactor shutdown protection function wh...

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Problems solved by technology

[0004] The above method is not rigorous in judgment and is prone to false triggers

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