Method for controlling secondary side pressure relief accidents of all vapor generators

Abstract

The invention discloses a method for controlling secondary side pressure relief accidents of all vapor generators. The method for controlling the secondary side pressure relief accidents of all the vapor generators comprises the following steps that S1, the accident occurrence reason is judged according to the important state parameters of a nuclear power plant and the equipment state condition; S2, trouble clearing operation of corresponding measures is carried out according to the judged accident occurrence reason; S3, if the trouble clearing operation succeeds, the step S31 is executed, andif the trouble clearing operation does not succeed, the step S32 is executed; S31, the vapor generators in a good state are selected, and water supply control operation and vapor exhaust control operation are carried out on the vapor generators until the vapor generators reach a cold shut-down amplifier state; and S32, the vapor generators in a failure state are selected, and water supply controloperation is carried out on the vapor generators until the vapor generators the cold shut-down amplifier state.

Description

technical field [0001] The invention relates to the field of reactor control, in particular to a control method for secondary side pressure relief accidents of all steam generators. Background technique [0002] When the following accident conditions occur in a nuclear power plant, the pressure on the secondary side of all steam generators will drop uncontrollably: the main steam pipe or the main feedwater pipe on the secondary side of the steam generator ruptures, and the valve used to isolate the breach cannot be closed ; The control system used to control steam discharge sends out a wrong valve opening signal, resulting in uncontrolled discharge of steam from the steam generator; the steam discharge valve on the steam pipeline is stuck in the open position and cannot be closed. These types of accidents will lead to an uncontrolled decrease in the pressure on the secondary side of the steam generator, which in turn will lead to a rapid drop in temperature and pressure in t...

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Problems solved by technology

[0003] 1. Due to the negative feedback effect in the core, too much positive feedback may be introduced in the accident, which will eventually increase the nuclear power and cause the risk of damage to the integrity of the fuel elements;

[0004] 2. If the discharge point on the secondary side of the steam generator appears in the containment, a large amount of high-energy fluid will be discharged into the containment after the accident, which will cause the temperature and pressure in the containment to rise, and the safety of the containment will be threatened;

The drastic change in pressure during this process will also pose a threat to the integrity of the equipment;

[0006] 4. In a short period of time, the fluid on the secondary side of the steam generator is quickly discharged, resulting in partial or even complete exposure of the heat transfer tubes, and the heat transfer tubes are in a dry state. When too much low-temperature feed water is injected into the steam generator during the subsequent recovery of the power plant, the heat transfer Tubes may be affected by thermal shock

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