Control method for coping with feedwater flow loss accident of nuclear power plant

A technology of feed water flow and control method, applied in nuclear power generation, power plant safety devices, factory parameter adjustment, etc., can solve problems such as emergency shutdown failure, adverse accident consequences, rise in reactor coolant temperature and pressure, etc., and achieve a stable and safe state , to ensure integrity, the effect of advanced technical level

Pending Publication Date: 2021-11-02
NUCLEAR POWER INSTITUTE OF CHINA
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) Due to the loss of feedwater flow, the heat release capacity of the secondary circuit system leading to the core decreases, and the temperature and pressure of the reactor coolant rise;
[0005] (3) After the main feedwater flow is lost, other failures may occur, such as: auxiliary feedwater startup failure, emergency shutdown failure, secondary side steam discharge valve stuck, etc., which will lead to more serious accident consequences
However, this kind of accident handling strategy is insufficient to deal with superimposed accidents such as system failure and operator misjudgment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control method for coping with feedwater flow loss accident of nuclear power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The existing nuclear power plant system includes: reactor, steam generator (can be more than one), steam turbine, the steam generator conducts heat exchange with the reactor through the primary circuit, and the steam generator conducts heat exchange with the steam turbine through the secondary circuit, and the configuration of the steam generator There is auxiliary water supply, the secondary circuit is equipped with a feedwater isolation valve and a steam isolation valve, and the primary circuit is equipped with a safety injection system and a normal waste heat discharge system.

[0038] The control method of the invention for dealing with the loss of feedwater flow accident of a nuclear power plant includes an accident handling process and a safety monitoring process.

[0039] When the feedwater flow loss accident occurs, the water level of the steam generator will be low or the steam flow / feedwater flow will not match, and a corresponding alarm signal will be generate...

Embodiment 2

[0052] On the basis of embodiment 1, further technical scheme is:

[0053] ATWS response operations include: shut down the reactor through system control or manually, check that the steam turbine stops working, then start the auxiliary water supply system to supply water to the steam generator, inject boron-containing solution into the primary circuit, and control the temperature and pressure of the primary circuit to stabilize , The water level and pressure of the steam generator in the secondary circuit are stable.

[0054] Shutdown response operations include controlling the temperature stabilization of the primary circuit, controlling the water level of the pressurizer, controlling the pressure of the pressurizer, stabilizing the water level of the steam generator, and controlling the main steam bypass system to discharge steam and release heat. Through this series of operations Discharge the heat of the reactor, and control the temperature, pressure and water level of the...

Embodiment 3

[0059] The further technical solution on the basis of Embodiments 1 and 2 is: between confirming the shutdown and confirming the safety start, it also includes confirming that the power supply of the emergency safety bus is normal, so as to ensure that the specially designed safety facility system is available.

[0060] The safety monitoring process mainly monitors the subcriticality and the secondary side heat sink.

[0061] When entering the monitoring of important safety functions, the monitoring method for subcriticality is to measure the neutron flux and doubling period in real time. If the power in the power range is ≥ 5% or the doubling time in the middle range is ≥ 0, it means that the subcriticality has occurred If the event is lost, enter the ATWS response operation to recover the sub-criticality. When subcriticality is restored, return to the accident handling process to bring the reactor to a safe state.

[0062] If the feedwater flow rate of the auxiliary feedwat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of pressurized water reactor nuclear power plant accident coping, in particular to a control method for coping with a feedwater flow loss accident of a nuclear power plant. The method comprises an accident handling process and a safety monitoring and function recovery process. A reactor shutdown signal triggered by the feedwater flow loss accident triggers emergency reactor shutdown of the reactor; whether the reactor is shut down is determined according to the nuclear power plant state parameters and equipment states; according to whether the reactor is shut down or not, shutdown is executed or shutdown is manually triggered to fail to execute ATWS response operation until the reactor enters a safe state; whether shutdown, safety injection starting, auxiliary water supply starting and secondary side breaking are conducted or not is confirmed in sequence, and corresponding follow-up actions or response operations are executed according to the judgment result until a normal waste heat removal system can be put into operation; and the safety monitoring and function recovery process comprises the steps of safety monitoring, safety function recovery until the loss event is relieved, and returning to accident treatment to continue corresponding follow-up actions. The water supply flow loss accident can be comprehensively dealt with.

Description

Technical field [0001] The invention relates to the technical field of accident response to pressurized water reactor nuclear power plants, and specifically to a control method for responding to accidents of loss of feed water flow in nuclear power plants. Background technique [0002] The following accident conditions in a nuclear power plant will result in a loss of water supply flow: failure of the main water pump due to mechanical or power supply system failure; incorrect closing of the main water valve due to an incorrect valve closing signal sent by the water supply control system; off-site AC power supply The loss causes the main feed water pump to stop operating; the secondary circuit break causes the loss of feed water flow. After a water supply flow loss accident occurs, the following consequences may occur: [0003] (1) Due to the continuous steam supply of the steam turbine, the steam generator capacity is reduced, the mismatch between the steam flow rate and th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G21D1/04G21D3/04G21D3/08
CPCG21D1/04G21D3/04G21D3/08Y02E30/00
Inventor陈宏霞冉旭喻娜吴清刘昌文冷贵君张晓华李峰方红宇鲜麟杨帆周科陆雅哲程坤杨韵佳
OwnerNUCLEAR POWER INSTITUTE OF CHINA