Method for coping with multichannel liquid level signal faults of evaporator in nuclear power station

Abstract

The invention relates to the technical field of nuclear power automatic control, in particular to a method for coping with multichannel liquid level signal faults of an evaporator in a nuclear power station. The method comprises following steps: generating an evaporator liquid level fault signal; generating an evaporator liquid level fault total signal; generating a signal indicating that the hotsection temperature is smaller than a set limit value; generating a cooling mode signal; performing AND operation on the signal indicating that the hot section temperature is smaller than a set limitvalue and the cooling mode signal to generate a cooling locking signal; performing locking operation on the evaporator liquid level fault total signal through locking logic and the cooling locking signal to generate an evaporator liquid level fault shutdown signal; generating a shutdown total signal by the evaporator liquid level fault shutdown signal and other shutdown signals, and executing shutdown. The shutdown protection function can be automatically triggered, meanwhile, the shutdown protection function is prevented from being triggered by mistake when the cooling mode of the reactor unit is inaccurate due to evaporator liquid level signal fault judgment, and the method 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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