Steam generator liquid level control method suitable for main pump starting and stopping working conditions

Abstract

The invention relates to a steam generator liquid level control method suitable for a main pump start-stop working condition. The steam generator liquid level control method comprises the following steps that S1, a main pump stop restart signal is input; s2, the main pump stops running, and the value of the steam flow in a flow control channel of the steam generator is switched to be 0; s3, after the liquid level in the steam generator is stabilized to a restart setting value; s4, the main pump is restarted, and the steam flow in the flow control channel is recovered to the measured value; and S5, the liquid level setting value of the steam generator is adjusted to an original value, and after the liquid level is stable, normal control over the liquid level of the steam generator by the flow control channel is recovered. The invention provides a method for automatically controlling the liquid level of a secondary-loop steam generator, so that the shutdown of a reactor caused by triggering a safety protection signal by the liquid level adjustment of the steam generator in the shutdown and restart process of a main pump is avoided, and the stability of the liquid level adjustment process of the steam generator is improved.

Description

technical field [0001] The invention relates to the field of nuclear power, and more specifically relates to a method for controlling the liquid level of a steam generator suitable for the main pump start-stop working condition. Background technique [0002] In the existing public technology, the steam generator (SG) liquid level automatic control function design is suitable for the normal operation process, and there is no specific SG liquid level automatic control function and execution strategy when a main pump is shut down and restarted. The SG liquid level deviation is too large due to the operation and restart conditions, which may trigger the protection function and cause the unit to shut down. [0003] Disadvantages: In the case of a main pump in the next low-power circuit suddenly shutting down and restarting, the SG liquid level on the secondary side of the steam generator will undergo a large-scale mutation due to the sudden change in heat transfer, resulting in a...

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Problems solved by technology

[0002] In the existing public technology, the steam generator (SG) liquid level automatic control function design is suitable for the normal operation process, and there is no specific SG liquid level automatic control function and execution strategy when a main pump is shut down and restarted. The SG liquid level deviation is too large due to the operation and restart conditions, which may trigger the protection function and cause the unit to shut down

[0003] Disadvantages: In the case of a main pump in the next low-power circuit suddenly shutting down and restarting, the SG liquid level on the secondary side of the steam generator will undergo a large-scale mutation due to the sudden change in heat transfer, resulting in a large-scale mutation of the SG Abnormal liquid level could cause reactor to jump

[0005] During the operation of the reactor, if the main pump is shut down unexpectedly, the coolant flow rate of the primary circuit drops sharply, and the heat exchange rate of the primary side of the

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