Abnormity diagnosis and treatment method for pressurized water reactor steam generator

Abstract

The invention relates to a pressurized water reactor steam generator abnormity diagnosis processing method. The method comprises the following steps: obtaining operation parameters related to the water level of a steam generator; performing abnormality diagnosis on the operation parameters, and determining an abnormality diagnosis result; outputting prompt information based on the abnormal diagnosis result; and determining a processing scheme corresponding to the abnormality diagnosis result, and performing abnormality processing according to the processing scheme. Abnormality diagnosis is carried out by obtaining the operation parameters related to the water level of the steam generator, prompt information is output, automatic abnormality diagnosis is achieved, and manual judgment time and judgment errors are reduced. In addition, the corresponding processing scheme is determined according to the abnormal diagnosis result, the correctness and efficiency of emergency intervention under the abnormal transient condition are improved, and safe and stable operation of the unit is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of steam generator abnormality diagnosis, and in particular to a pressurized water reactor steam generator abnormality diagnosis and processing method. Background Art

[0002] The steam generator of a nuclear power plant transfers the heat generated by the reactor to the secondary circuit, and generates steam by heating the water in the secondary circuit to drive the steam turbine generator to generate electricity. The water level of the steam generator is in a dynamic equilibrium state during this process. Once the balance is broken, the water level of the steam generator will change abnormally. Monitoring and controlling the water level of the steam generator is the most important task for the operator in the main control room during daily duty, especially when the water level of the steam generator is abnormal and emergency intervention is required. In the prior art, the abnormal water level of the steam generator needs to be manually diagnosed by the operator in the main control room. Since there are many reasons for the abnormal water level of the steam generator and once it deteriorates, it will cause the reactor to automatically shut down, the time given to the operator in the main control room to judge and intervene is extremely urgent. Once the judgment is wrong or the intervention is not timely, it will cause very serious consequences. It is a great test of the ability level of the operator in the main control room. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for diagnosing and processing abnormalities of a steam generator of a pressurized water reactor.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a method for diagnosing and processing abnormalities of a steam generator of a pressurized water reactor, comprising the following steps:

[0005] Obtaining operating parameters related to steam generator water level;

[0006] Performing abnormal diagnosis on the operating parameters and determining abnormal diagnosis results;

[0007] Outputting prompt information based on the abnormal diagnosis result;

[0008] Determine a processing scheme corresponding to the abnormal diagnosis result, and perform abnormal processing according to the processing scheme.

[0009] Preferably, a plurality of main water supply pumps are provided on the main input pipelines of all steam generator loops, and the main water supply pumps are used to deliver water to the steam generators. The operating parameters include the operating state and outlet pressure value of each main water supply pump. The abnormality diagnosis of the operating parameters and determining the abnormality diagnosis results include:

[0010] determining the main water supply pump in operation according to the operating state;

[0011] If the outlet pressure value of any running main water supply pump is less than the preset pressure threshold, it is determined that the corresponding main water supply pump has an output shortage abnormality; or,

[0012] The operating parameters include the operating status and pump flow value of each main water supply pump, and the abnormality diagnosis of the operating parameters and determining the abnormality diagnosis results include:

[0013] determining the main water supply pump in operation according to the operating state;

[0014] When the number of the operating main water supply pumps is greater than one, if the pump flow deviation of any two main water supply pumps is greater than a preset first flow deviation threshold, it is determined that the flow abnormality occurs in the any two main water supply pumps.

[0015] Preferably, a plurality of main water supply valves are provided on the input pipeline of each steam generator loop, and the main water supply valves are used to adjust the flow delivered to the corresponding steam generator, and the operating parameters include the required opening value and the actual opening value of each main water supply valve;

[0016] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0017] If the required opening value of any main water supply valve is greater than the preset first opening threshold and the actual opening does not reach the open limit, or if the required opening value of any main water supply valve is less than the preset second opening threshold and the actual opening does not reach the closed limit;

[0018] Determine whether the corresponding main water supply valve has a stuck valve abnormality.

[0019] Preferably, the input pipeline comprises a main input pipeline, a main water supply valve is provided on the main input pipeline of each steam generator loop, and the operating parameter comprises a required opening value of the main water supply valve on each main input pipeline;

[0020] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0021] If the demand opening deviation of the main water supply valves on all main input pipelines is greater than a preset opening deviation threshold, it is determined that an abnormal regulation of the main water supply valves on the main input pipelines occurs.

[0022] Preferably, at least two main water supply flow meters are provided on the input pipeline of each steam generator loop, and the main water supply flow meters are used to measure the water supply flow value of the steam generator, and the operating parameters include the water supply flow value measured by each main water supply flow meter;

[0023] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0024] If the deviation of the water supply flow values ​​measured by all the main water supply flow meters of any steam generator loop is greater than a preset second flow deviation threshold, it is determined that a main water supply flow meter abnormality occurs in the corresponding loop.

[0025] Preferably, the steam generator is used to convert input water into steam and output steam through an output pipeline. At least two main steam flow meters are provided on the output pipeline of each steam generator loop. The main steam flow meter is used to measure the steam flow value output by the steam generator. The operating parameters include the steam flow value measured by each main steam flow meter.

[0026] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0027] If the deviation of the steam flow values ​​measured by all the main steam flow meters of any steam generator loop is greater than a preset third flow deviation threshold, it is determined that a main steam flow meter abnormality occurs in the corresponding loop.

[0028] Preferably, at least two main steam pressure gauges are provided on the output pipeline of each steam generator loop, and the main steam pressure gauges are used to measure the steam pressure value output by the steam generator, and the operating parameters include the steam pressure value measured by each main steam pressure gauge;

[0029] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0030] If the deviation of the steam pressure values ​​measured by all the main steam pressure gauges of any steam generator loop is greater than a preset pressure deviation threshold, it is determined that a main steam pressure gauge abnormality occurs in the corresponding loop.

[0031] Preferably, the operating parameters include a liquid level value of each steam generator, a water supply flow value, and a nuclear power value of a pressurized water reactor;

[0032] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0033] If the core power value is greater than a preset power threshold, the liquid level value of any steam generator is less than a preset first liquid level threshold, and the water supply flow value is less than a preset first flow threshold, it is determined that the corresponding steam generator has a water supply shortage abnormality;

[0034] If the core power value is greater than the preset power threshold, the liquid level value of any steam generator is greater than the preset second liquid level threshold, and the water supply flow value is greater than the preset second flow threshold, it is determined that the corresponding steam generator has an excessive water supply abnormality.

[0035] Preferably, each steam generator is provided with a plurality of liquid level gauges, and the operating parameters include the liquid level value measured by each liquid level gauge in each steam generator;

[0036] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0037] If the deviation of the liquid level values ​​measured by all the liquid level gauges in any steam generator is greater than a preset liquid level deviation threshold, it is determined that a liquid level gauge abnormality occurs in the corresponding steam generator.

[0038] Preferably, the operating parameters include a water flow value and a steam flow value of each steam generator loop;

[0039] The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises:

[0040] Calculating the total water supply flow value and the total steam flow value of all steam generator loops according to the water supply flow value and the steam flow value of each steam generator loop respectively;

[0041] If the deviation between the total water supply flow value and the total steam flow value is greater than a preset fourth flow deviation threshold, it is determined that an abnormal deviation between the total water supply flow value and the total steam flow value occurs.

[0042] The implementation of the present invention has the following beneficial effects: by obtaining the operating parameters related to the water level of the steam generator to perform abnormal diagnosis and output prompt information, automatic abnormal diagnosis is realized, and the time and judgment errors of manual judgment are reduced. In addition, the corresponding processing plan is determined according to the abnormal diagnosis result, which improves the correctness and efficiency of emergency intervention in abnormal transient conditions, and greatly improves the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0044] Figure 1 It is a connection diagram of a steam generator in an embodiment of a method for diagnosing and processing abnormalities of a steam generator in a pressurized water reactor according to the present invention;

[0045] Figure 2 It is a flow chart of an embodiment of a method for diagnosing and processing abnormalities of a steam generator in a pressurized water reactor according to the present invention. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0047] The abnormal diagnosis and processing method of the pressurized water reactor steam generator of the present invention can be applied to the control platform of the nuclear power plant, and can automatically judge the cause of the abnormal water level of the steam generator of the nuclear power plant. The main function of the steam generator is to transfer the heat of the reactor to the secondary circuit feed water as a heat exchange device, so that it can generate saturated steam to supply the steam turbine generator and drive the steam turbine generator to maintain the rated speed rotation, thereby generating electricity to provide the power grid to meet the electricity demand. Therefore, during normal operation, the water level of the steam generator is maintained at the water level value required by the design by the balance of water supply and exhaust steam.

[0048] A plurality of steam generator loops are provided in a nuclear power plant, each of which includes a steam generator, a corresponding input pipeline and an output pipeline connected to the steam generator. A plurality of main water supply valves are provided on the input pipeline of each steam generator loop, wherein the input pipeline includes a main input pipeline, and a main water supply valve is provided on the main input pipeline of each steam generator loop. The main water supply valve is used to adjust the flow delivered to the corresponding steam generator. At least two main water supply flow meters are provided on the input pipeline of each steam generator loop, and the main water supply flow meter is used to measure the water supply flow value of the steam generator. The steam generator is used to convert the input water into steam and output the steam through the output pipeline. Each steam generator is provided with a plurality of liquid level meters, and the liquid level meter is used to measure the water level in the steam generator to obtain the liquid level value. At least two main steam flow meters are provided on the output pipeline of each steam generator loop, and the main steam flow meter is used to measure the steam flow value output by the steam generator. At least two main steam pressure gauges are provided on the output pipeline of each steam generator loop, and the main steam pressure gauge is used to measure the steam pressure value output by the steam generator. There are several main water supply pumps on the main input pipeline of all steam generator loops, which are used to transport water to the steam generators.

[0049] like Figure 2As shown, in this embodiment, the nuclear power plant has three steam generators, namely the first steam generator SG1, the second steam generator SG2 and the third steam generator SG3. The loops in which they are located are the first steam generator loop, the second steam generator loop and the third steam generator loop. The input pipeline of each loop is connected to the output end of the AHP system (high-pressure feedwater heater system), and the input end of the AHP system is connected to the main input pipeline, which supplies water to each steam generator loop through the AHP system.

[0050] The main input pipeline of the first steam generator loop is provided with a first main water supply valve ARE031VL, a first main water supply flow meter ARE043MD, and a second main water supply flow meter ARE046MD. The bypass input pipeline of the first steam generator loop is provided with a second main water supply valve ARE242VL. The output pipeline of the first steam generator loop is provided with a first main steam flow meter VVP001MD, a second main steam flow meter VVP004MD, a first main steam pressure gauge VVP007MP, a second main steam pressure gauge VVP008MP, and a third main steam pressure gauge VVP009MP.

[0051] The main input pipeline of the second steam generator loop is provided with a third main water supply valve ARE032VL, a third main water supply flow meter ARE044MD, and a fourth main water supply flow meter ARE047MD. The bypass input pipeline of the first steam generator loop is provided with a fourth main water supply valve ARE243VL. The output pipeline of the first steam generator loop is provided with a third main steam flow meter VVP002MD, a fourth main steam flow meter VVP005MD, a fourth main steam pressure gauge VVP010MP, a fifth main steam pressure gauge VVP011MP, and a sixth main steam pressure gauge VVP012MP.

[0052] The main input pipeline of the third steam generator loop is provided with a fifth main water supply valve ARE033VL, a fifth main water supply flow meter ARE045MD, and a sixth main water supply flow meter ARE048MD. The bypass input pipeline of the first steam generator loop is provided with a sixth main water supply valve ARE244VL. The output pipeline of the first steam generator loop is provided with a fifth main steam flow meter VVP003MD, a sixth main steam flow meter VVP006MD, a seventh main steam pressure gauge VVP013MP, an eighth main steam pressure gauge VVP014MP, and a ninth main steam pressure gauge VVP015MP.

[0053] The total input pipeline includes a first input pipeline, a second input pipeline and a third input pipeline. The first input pipeline is provided with a first main water supply pump APA102PO, and the outlet of the first main water supply pump APA102PO is provided with a first main water supply pump flowmeter APA101MD and a first main water supply pump pressure gauge APA102MP. The second input pipeline is provided with a second main water supply pump APA202PO, and the outlet of the second main water supply pump APA202PO is provided with a second main water supply pump flowmeter APA201MD and a second main water supply pump pressure gauge APA202MP. The third input pipeline is provided with a third main water supply pump APA302PO, and the outlet of the third main water supply pump APA302PO is provided with a third main water supply pump flowmeter APA301MD and a third main water supply pump pressure gauge APA302MP.

[0054] In other embodiments, according to actual needs, other numbers of main steam pressure gauges, main steam flow meters, and main water supply flow meters may be provided in each steam generator loop, for example, four main steam pressure gauges, three main steam flow meters, and three main water supply flow meters may be provided. The present invention is not limited to this.

[0055] The following describes the method for diagnosing abnormality of a steam generator in a pressurized water reactor in combination with the connection details of the steam generator in the pressurized water reactor. It is understandable that the above description provides specific connection details of the steam generator in the pressurized water reactor for illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention.

[0056] like Figure 1 As shown, in one embodiment of the method for diagnosing abnormality of a steam generator in a pressurized water reactor, the following steps are included:

[0057] S1. Obtain the operating parameters related to the water level of the steam generator. Specifically, the water level of the steam generator is balanced by the water supply and exhaust steam. The operating parameters related to the water level of the steam generator refer to the operating parameters of the steam generator itself and the operating parameters related to the water supply and exhaust steam. These parameters can be obtained from the control cabinet of the nuclear power plant or directly monitored by instruments and equipment.

[0058] S2. Perform abnormal diagnosis on the operating parameters and determine abnormal diagnosis results. This embodiment collects the operating parameters of various instruments and equipment associated with the steam generator in real time, diagnoses and analyzes various operating parameters separately, and can automatically monitor whether the water level of the steam generator is abnormal and identify the abnormal type to obtain abnormal diagnosis results.

[0059] Specifically, the water supply of the steam generator is controlled by each main water supply pump and each main water supply valve. In the original steam generator water level control system of the unit, the control signal of the main water supply valve is determined by the operating parameters of the main water supply flow meter, the main steam flow meter, the main steam pressure gauge, the liquid level gauge and other instruments. Therefore, as long as these operating parameters are abnormal, the regulation of the main water supply valve will be affected. Improper regulation of the main water supply valve may cause abnormal water level in the steam generator, which in turn causes the shutdown of the nuclear power plant. In addition to the abnormal regulation of the main water supply valve, reasons such as insufficient output of the main water supply pump and mechanical abnormality of the main water supply valve body will cause abnormal water level in the steam generator. Therefore, the types of abnormalities that need to be diagnosed include but are not limited to abnormal main water supply pumps, abnormal main water supply valves, abnormal main water supply flow, abnormal main steam flow, abnormal main water supply pump flow, etc. The specific abnormality type can be determined according to the operation needs.

[0060] S3. Output prompt information based on the abnormal diagnosis result. If an abnormality occurs, the corresponding prompt information is output according to the specific abnormality type, so as to remind the operator in time. In addition, the types of prompt information include but are not limited to: text prompt information, sound prompt information or logo prompt information. If various operating parameters are normal and no abnormality occurs, a prompt information indicating normal operation is output, or no prompt is required.

[0061] For example, in the display screen of the control platform, corresponding prompt areas for various types of faults of various equipment are preset, and the prompt areas of the equipment in each steam generator loop are integrated. The integrated prompt areas of different loops are distinguished by different tones, which is convenient for operators to distinguish and prevent operational errors. When a certain abnormality occurs in a certain equipment, a text prompt information is given in the corresponding prompt area according to the corresponding abnormal prompt information, and the importance of the abnormal information is highlighted by a red box, so as to prompt the operator. In addition, an indicator control is also set to display the prompt information, which is displayed in red or green according to the abnormal prompt information or the normal operation prompt information, and the information is marked with a strong contrast with the background color, which is more likely to attract the attention of the operator in the main control room. Of course, it can be understood that other identification methods can also be used as needed.

[0062] S4. Determine the processing plan corresponding to the abnormal diagnosis result, and handle the exception according to the processing plan. The processing plan is divided into an automatic control processing plan and an emergency intervention control processing plan. When an abnormality occurs, if the processing plan corresponding to the abnormality is an automatic control processing plan, the processing plan is automatically executed to handle the abnormality. If it is an emergency intervention control processing plan, emergency intervention guidance information is given, and then the corresponding processing plan is obtained according to the emergency intervention instruction entered by the operator; or, after the original automatic control module of the corresponding equipment is converted to manual control mode, the corresponding processing plan is obtained according to the emergency intervention instruction entered by the operator. In addition, if multiple abnormalities occur at the same time, multiple processing plans need to be determined. When no abnormality occurs, there is no need to determine a processing plan, and normal unit control can continue.

[0063] The solution of this embodiment obtains the operating parameters related to the water level of the steam generator to perform abnormal diagnosis and output prompt information, thereby realizing automatic abnormal diagnosis and reducing the time and errors of manual judgment. In addition, the corresponding processing plan is determined according to the abnormal diagnosis results, which improves the accuracy and efficiency of emergency intervention in abnormal transient situations, and greatly improves the safe and stable operation of the unit.

[0064] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the operating status and outlet pressure value of each main water supply pump. Among them, by collecting the measurement data of the first main water supply pump pressure gauge APA102MP, the second main water supply pump pressure gauge APA202MP and the third main water supply pump pressure gauge APA302MP, the outlet pressure values ​​of the first main water supply pump APA102PO, the second main water supply pump APA202PO and the third main water supply pump APA302PO can be obtained accordingly.

[0065] Step S2 includes: determining the main water supply pump in operation according to the operating status; if the outlet pressure value of any of the main water supply pumps in operation is less than the preset pressure threshold, determining that the corresponding main water supply pump has an abnormality of insufficient output. In this embodiment, it is necessary to diagnose whether there is an abnormality of insufficient output of the main water supply pumps in operation. The preset pressure threshold is 7.6Mpa. Of course, other values ​​can also be taken in other embodiments. If any of the main water supply pumps is in operation and the outlet pressure value is lower than 7.6Mpa, it is determined that its output is insufficient. If it is not lower than 7.6Mpa, it is determined that its output is normal.

[0066] Step S3 includes: outputting a first prompt message based on the abnormal diagnosis result. The first prompt message includes an abnormal prompt message of insufficient output or a normal prompt message of output. If a main water supply pump has an abnormal insufficient output, an abnormal prompt message of insufficient output of the abnormal main water supply pump is generated; if no abnormal insufficient output occurs, the corresponding normal prompt message of output is output.

[0067] In this embodiment, the abnormality processing scheme is an emergency intervention control processing scheme, and the emergency intervention instruction is executed after receiving the corresponding emergency intervention instruction input by the operator. For example, the speed of the main water supply pump is increased, the main water supply pump is switched, or other methods are used. After the abnormality is processed according to the processing scheme, the main water supply pump is continuously diagnosed. Of course, in other embodiments, an automatic control processing scheme can also be used.

[0068] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the operating status and pump flow value of each main water supply pump. Among them, by collecting the measurement data of the first main water supply pump flow meter APA101MD, the second main water supply pump flow meter APA201MD and the third main water supply pump flow meter APA301MD, the pump flow values ​​of the first main water supply pump APA102PO, the second main water supply pump APA202PO and the third main water supply pump APA302PO can be obtained accordingly.

[0069] Step S2 includes: determining the main water supply pump in operation according to the operating status; when the number of the main water supply pumps in operation is greater than one, if the pump flow deviation of any two main water supply pumps is greater than the preset first flow deviation threshold, it is determined that any two main water supply pumps have a flow abnormality. In this embodiment, it is necessary to diagnose whether there is a flow abnormality in the main water supply pumps in operation. When the number of the main water supply pumps in operation is less than or equal to one, this diagnosis is not performed. The preset first flow deviation threshold is 600T / H. Of course, other values ​​can also be taken in other embodiments. If the pump flow deviation of any two main water supply pumps in operation is greater than 600T / H, it is determined that the flow of these two main water supply pumps in operation is abnormal. If the pump flow deviation of any two main water supply pumps in operation is less than or equal to 600T / H, it is determined that the flow of all the main water supply pumps in operation is normal.

[0070] Step S3 includes: outputting a second prompt message based on the abnormality diagnosis result. The second prompt message includes abnormal flow prompt message or normal flow prompt message. If the flow of a main water supply pump is abnormal, the abnormal flow prompt message of the abnormal main water supply pump is generated; if no abnormal flow occurs, the corresponding normal flow prompt message is output.

[0071] In this embodiment, the abnormality processing scheme is an emergency intervention control processing scheme, and the emergency intervention instruction is executed after receiving the corresponding emergency intervention instruction input by the operator. For example, the speed of each main water supply pump is adjusted or other methods are used. After the abnormality is processed according to the processing scheme, the main water supply pump is continuously diagnosed. Of course, in other embodiments, an automatic control processing scheme can also be adopted as needed.

[0072] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the required opening value and the actual opening value of each main water supply valve. The required opening value is the target opening value of the main water supply valve.

[0073] Step S2 includes: if the required opening value of any main water supply valve is greater than the preset first opening threshold and the actual opening does not reach the open limit, or if the required opening value of any main water supply valve is less than the preset second opening threshold and the actual opening does not reach the closed limit; determine that the corresponding main water supply valve has a stuck valve abnormality. Specifically, the stuck valve abnormality means that the valve is blocked or stuck. The preset first opening threshold is 99%, and the second opening threshold is 1%. Of course, other values ​​can also be taken in other embodiments. If the required opening value of a main water supply valve in ARE031VL, ARE032VL, ARE033VL, ARE242VL, ARE243VL, ARE244VL is greater than 99% but the open limit does not act, or the required opening value is less than 1% but the closed limit does not act, then it is determined that the stuck valve is abnormal.

[0074] Step S3 includes: outputting a third prompt information based on the abnormality diagnosis result. The third prompt information includes a stuck valve abnormality prompt information or a valve not stuck valve prompt information. If a main water supply valve has a stuck valve abnormality, a stuck valve abnormality prompt information of the abnormal main water supply pump is generated; if no stuck valve abnormality occurs, the corresponding valve not stuck valve prompt information is output.

[0075] The solution for the main water supply valve with a stuck valve abnormality is an emergency intervention control solution, which executes the emergency intervention instruction after receiving the corresponding emergency intervention instruction input by the operator. For example, repair the main water supply valve. After the abnormality is handled according to the solution, the main water supply valve continues to be diagnosed.

[0076] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the required opening value of the main water supply valve on each main input pipeline. Specifically, the required opening values ​​of the first main water supply valve ARE031VL, the third main water supply valve ARE032 VL, and the fifth main water supply valve ARE033VL are obtained.

[0077] Step S2 includes: if the required opening deviation of the main water supply valves on all main input pipelines is greater than the preset opening deviation threshold, it is determined that the main water supply valves on the main input pipelines are abnormally regulated. Specifically, the preset opening deviation threshold is 10%. Of course, other values ​​can also be taken in other embodiments. The deviation value between the required opening values ​​of the three main water supply valves is calculated. If it is greater than 10%, it is determined that the main water supply valves are abnormally regulated and the required opening value is improperly set. If it is less than or equal to 10%, it is determined that the regulation is normal.

[0078] Step S3 includes: outputting fourth prompt information based on the abnormal diagnosis result. The fourth prompt information includes abnormal adjustment prompt information or normal adjustment prompt information. If a main water supply valve is abnormally adjusted, the abnormal adjustment prompt information of the abnormal main water supply valve is generated; if no abnormal adjustment occurs, the corresponding normal adjustment prompt information is output.

[0079] In this embodiment, the abnormal processing scheme is an emergency intervention control processing scheme to obtain the new required opening value of each main water supply valve input by the operator. Of course, in other embodiments, an automatic control processing scheme can also be used as needed to automatically recalculate the required opening value of each main water supply valve.

[0080] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the water supply flow value measured by each main water supply flow meter. Specifically, the water supply flow value of the input steam generator measured by the main water supply flow meters ARE043MD, ARE044MD, ARE045MD, ARE046MD, ARE047MD, ARE048MD, etc. is obtained. It should be noted that in order to ensure the correctness of the diagnosis, the water supply flow value of the same loop should be the value measured by each main water supply flow meter in the loop at the same time, and the measurement time of different loops can be different.

[0081] Step S2 includes: if the deviation of the water supply flow values ​​measured by all the main water supply flow meters of any loop is greater than the preset second flow deviation threshold, it is determined that the main water supply flow meter of the corresponding loop is abnormal. Specifically, the main water supply flow meter of the same loop measures the water supply flow value input to the same steam generator. Under normal circumstances, the measurement deviation of each main water supply flow meter should be within a reasonable range. The preset second flow deviation threshold is 80T / H. Of course, other values ​​can also be taken in other embodiments. Calculate the deviation of all the main water supply flow meters in a loop. If the deviation is greater than 80T / H, it is determined that the main water supply flow meter of the loop is abnormal; if it is less than or equal to 80T / H, it is determined that the measurement of the main water supply flow meter of the loop is normal.

[0082] Step S3 includes: outputting fifth prompt information based on the abnormal diagnosis result. The fifth prompt information includes main water supply flow meter abnormal prompt information or main water supply flow meter normal prompt information. If a main water supply flow meter measurement abnormality exists in a certain loop, the main water supply flow meter abnormal prompt information of the loop is generated; if the main water supply flow meter measurement abnormality does not occur, the corresponding main water supply flow meter normal prompt information is output.

[0083] In this embodiment, each loop is provided with two main water supply flow meters. Normally, the flow meter with the smallest reading participates in the automatic control of the main water supply valve of the steam generator. When a measurement abnormality occurs, it is considered that there is a fault in the two instruments and the normal regulation of the water level of the steam generator cannot be met. When one of the main water supply flow meters fails, the displayed reading is lower than the actual value, which will cause the main water supply valve to open abnormally, resulting in a high water level in the steam generator and generating a nuclear power plant shutdown signal. In step S4, the corresponding processing scheme is an automatic control processing scheme: the automatic control mode of the corresponding main water supply valve is automatically switched to a manual control mode, thereby avoiding the abnormal opening of the main water supply valve according to the original control logic, and stabilizing the water level of the steam generator. Furthermore, the processing scheme also includes cutting off the abnormal main water supply flow meter.

[0084] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the steam flow value measured by each main steam flow meter. Specifically, the steam flow value of the steam generator output measured by the main steam flow meters such as VVP001MD, VVP002MD, VVP003MD, VVP004MD, VVP005MD, and VVP006MD is obtained. It should be noted that in order to ensure the correctness of the diagnosis, the steam flow value of the same loop should be the value measured by each main steam flow meter in the loop at the same time, and the measurement time of different loops may be different.

[0085] Step S2 includes: if the deviation of the steam flow values ​​measured by all the main steam flow meters of any loop is greater than a preset third flow deviation threshold, it is determined that a main steam flow meter abnormality occurs in the corresponding loop.

[0086] Specifically, the main steam flow meter of the same loop measures the steam flow value input to the same steam generator. Under normal circumstances, the measurement deviation of each main steam flow meter should be within a reasonable range. The preset third flow deviation threshold is 88T / H. Of course, other values ​​can also be taken in other embodiments. Calculate the deviation of all main steam flow meters in a loop. If the deviation is greater than 88T / H, it is determined that the main steam flow meter of the loop is abnormal; if it is less than or equal to 88T / H, it is determined that the main steam flow meter of the loop is measuring normally.

[0087] Step S3 includes: outputting sixth prompt information based on the abnormal diagnosis result. The sixth prompt information includes main steam flow meter abnormal prompt information or main steam flow meter normal prompt information. If a main steam flow meter measurement abnormality exists in a certain loop, the main steam flow meter abnormal prompt information of the loop is generated; if no measurement abnormality occurs, the corresponding main steam flow meter normal prompt information is output.

[0088] In this embodiment, each loop is provided with two main steam flow meters. Normally, the flow meter with the largest reading participates in the automatic control of the main water supply valve of the steam generator. When a measurement abnormality occurs, it is considered that there is a fault in the two instruments and the normal regulation of the water level of the steam generator cannot be met. When one of the main steam flow meters fails, the displayed reading is higher than the actual value, which will cause the main water supply valve to open abnormally, resulting in a high water level in the steam generator and a shutdown signal for the nuclear power plant. In step S4, the corresponding processing scheme is an automatic control processing scheme: the automatic control mode of the corresponding main water supply valve is automatically switched to a manual control mode, thereby avoiding the abnormal opening of the main water supply valve according to the original control logic, and stabilizing the water level of the steam generator. Furthermore, the processing scheme also includes cutting off the abnormal main steam flow meter.

[0089] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the steam pressure value measured by each main steam pressure gauge. Specifically, the steam pressure value of the steam generator output measured by the main steam pressure gauges such as VVP007MP, VVP008MP, VVP009MP, VVP010MP, VVP011MP, VVP012MP, VVP013MP, VVP014MP, and VVP015MP is obtained. It should be noted that in order to ensure the correctness of the diagnosis, the steam pressure value of the same loop should be the value measured by each main steam pressure gauge in the loop at the same time, and the measurement time of different loops may be different.

[0090] Step S2 includes: if the deviation of the steam pressure values ​​measured by all the main steam pressure gauges of any loop is greater than a preset pressure deviation threshold, it is determined that a main steam pressure gauge abnormality occurs in the corresponding loop.

[0091] Specifically, the main steam pressure gauge of the same loop measures the steam pressure value of the same steam generator. Under normal circumstances, the measurement deviation of each main steam pressure gauge should be within a reasonable range. The preset third flow deviation threshold is 3 bar. Of course, other values ​​can also be taken in other embodiments. Calculate the deviation of all main steam pressure gauges in a loop. If the deviation is greater than 3 bar, it is determined that the main steam pressure gauge of the loop is abnormal; if it is less than or equal to 3 bar, it is determined that the main steam pressure gauge of the loop is measuring normally.

[0092] Step S3 includes: outputting seventh prompt information based on the abnormal diagnosis result. The seventh prompt information includes main steam pressure gauge abnormal prompt information or main steam pressure gauge normal prompt information. If a main steam pressure gauge measurement abnormality exists in a certain loop, the main steam pressure gauge abnormal prompt information of the loop is generated; if no measurement abnormality occurs, the corresponding main steam pressure gauge normal prompt information is output.

[0093] In this embodiment, each loop is provided with three main steam pressure gauges. Normally, the pressure gauge with the largest reading participates in the automatic control of the main water supply valve of the steam generator. When a measurement abnormality occurs, it is considered that there is a fault in the three instruments and the normal regulation of the water level of the steam generator cannot be met. When one of the main steam pressure gauges fails, the displayed reading is higher than the actual value, which will cause the main water supply valve to open abnormally, resulting in a high water level in the steam generator and a shutdown signal for the nuclear power plant. In step S4, the corresponding processing scheme is an automatic control processing scheme: the automatic control mode of the corresponding main water supply valve is automatically switched to a manual control mode, thereby avoiding the abnormal opening of the main water supply valve according to the original control logic, and stabilizing the water level of the steam generator. Furthermore, the processing scheme also includes cutting off the abnormal main steam pressure gauge.

[0094] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the liquid level value, water supply flow value and nuclear power value of the pressurized water reactor of each loop steam generator. Specifically, the liquid level value and water supply flow value of each steam generator at the same time, and the nuclear power value of the pressurized water reactor at the corresponding time are obtained respectively.

[0095] Step S2 includes: if the core power value is greater than the preset power threshold, the liquid level value of any steam generator is less than the preset first liquid level threshold and the water supply flow value is less than the preset first flow threshold, then it is determined that the corresponding steam generator has a water shortage abnormality. Among them, the preset power threshold is 20.5% FP, the preset first liquid level threshold is -0.3m, and the preset first flow threshold is 1800T / H. Of course, other values ​​can also be taken in other embodiments.

[0096] If the core power value is greater than the preset power threshold, the liquid level value of any steam generator is greater than the preset second liquid level threshold, and the water supply flow value is greater than the preset second flow threshold, it is determined that the corresponding steam generator has an excessive water supply abnormality. The preset second liquid level threshold is 0.3m, and the preset second flow threshold is 2100T / H. Of course, other values ​​may also be taken in other embodiments.

[0097] Step S3 includes: outputting eighth prompt information based on the above diagnosis result. The eighth prompt information includes water supply shortage abnormal prompt information, water supply excess abnormal prompt information or water supply normal prompt information. If a steam generator has water supply shortage abnormality, then water supply shortage abnormal prompt information of the steam generator is generated; if the steam generator has water supply excess abnormality, then corresponding water supply excess abnormal prompt information is generated; if the steam generator does not have the above abnormality, then corresponding water supply normal prompt information is generated.

[0098] In this embodiment, the processing scheme for these two abnormalities is an emergency intervention control processing scheme, and the emergency intervention instruction is executed after receiving the corresponding emergency intervention instruction input by the operator. For example, the actual opening value of the main water supply valve or the speed of the main water supply pump is adjusted to solve the abnormality of insufficient water supply and the abnormality of excessive water supply. Of course, in other embodiments, automatic control processing schemes can also be used as needed.

[0099] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the liquid level value measured by each liquid level gauge in the steam generator of each loop. Specifically, the measurement data of each liquid level gauge in each steam generator is obtained respectively, for example, the liquid level values ​​measured by the liquid level gauges ARE010MN, ARE052MN, ARE058MN, ARE020 MN, ARE053MN, ARE059MN, ARE030MN, ARE 054MN, ARE060MN, etc. are obtained.

[0100] Step S2 includes: if the deviation of the liquid level values ​​measured by all the liquid level gauges in any steam generator is greater than a preset liquid level deviation threshold, determining that a liquid level gauge abnormality occurs in the corresponding steam generator.

[0101] Specifically, the level gauges in the same steam generator measure the level value of the same steam generator. Under normal circumstances, the measurement deviation of each level gauge should be within a reasonable range to ensure the normal control of the unit. The preset level deviation threshold is 0.14m. Of course, other values ​​can also be taken in other embodiments. Calculate the deviation of all level gauges in a steam generator. If the deviation is greater than 0.14m, it is determined that the level gauge of the steam generator is abnormal; if it is less than or equal to 0.14m, it is determined that the level gauge of the steam generator is normal. For example, the level deviation is calculated based on the level values ​​measured by level gauges such as ARE010MN, ARE052MN, and ARE058MN, and compared with the level deviation threshold.

[0102] Step S3 includes: outputting the ninth prompt information based on the abnormal diagnosis result. The ninth prompt information includes liquid level meter abnormal prompt information or liquid level meter normal prompt information. If a certain steam generator has a liquid level meter measurement abnormality, then the liquid level meter abnormal prompt information of the steam generator is generated; if there is no liquid level meter measurement abnormality, then the corresponding liquid level meter normal prompt information is output.

[0103] In this embodiment, each steam generator is provided with three liquid level gauges, and the liquid level value of the steam generator participates in the automatic control of the main water supply valve of the steam generator. When a measurement abnormality occurs, it is considered that there is a fault in the three liquid level gauges, and the normal regulation of the water level of the steam generator cannot be satisfied. In step S4, the corresponding processing scheme is an automatic control processing scheme: the automatic control mode of the corresponding main water supply valve is automatically switched to a manual control mode, thereby avoiding the abnormal opening of the main water supply valve according to the original control logic, and stabilizing the water level of the steam generator. Furthermore, the processing scheme also includes cutting off the abnormal liquid level gauge.

[0104] In an optional embodiment, step S1 includes: obtaining operating parameters related to the water level of the steam generator, the operating parameters including the water supply flow value and the steam flow value of each steam generator. Specifically, the main water supply flow meter and the main water supply flow meter of each steam generator are obtained respectively, and the water supply flow value and the steam flow value of the steam generator are obtained after a preset value rule.

[0105] Step S2 includes: calculating the total water supply flow value and the total steam flow value of the steam generators of all loops according to the water supply flow value and the steam flow value of the steam generator of each loop, respectively. If the deviation value between the total water supply flow value and the total steam flow value is greater than the preset fourth flow deviation threshold, it is determined that the deviation between the total water supply flow value and the total steam flow value is abnormal.

[0106] Specifically, under normal circumstances, the water supply and exhaust of the steam generator are balanced, so the measurement deviation of the water supply flow value and the steam flow value should be within a reasonable range. The preset fourth flow deviation threshold is 400T / H. Of course, other values ​​can also be taken in other embodiments. The water supply flow values ​​of each steam generator are added to obtain the total water supply flow value, and the steam flow values ​​of each steam generator are added to obtain the total steam flow value. Then, the deviation between the total water supply flow value and the total steam flow value is calculated. If the deviation value is greater than 400T / H, it is judged that the deviation between the total water supply flow value and the total steam flow value is abnormal, indicating that the total water supply and total exhaust of the reactor are not balanced.

[0107] Step S3 includes: outputting tenth prompt information based on the abnormal diagnosis result. The tenth prompt information includes abnormal deviation prompt information of the total water supply flow value and the total steam flow value, or normal deviation prompt information of the total water supply flow value and the total steam flow value.

[0108] In this embodiment, the abnormality processing scheme is an emergency intervention control processing scheme, and the emergency intervention instruction is executed after receiving the corresponding emergency intervention instruction input by the operator. For example, the opening of the main water supply valve is adjusted. Of course, in other embodiments, an automatic control processing scheme can also be adopted as needed.

[0109] The present invention can diagnose and send an abnormal signal immediately after a slight abnormality occurs in the steam generator water level through the automatic diagnosis of the 11 types of abnormalities related to the steam generator water level and the prompt of the diagnosis results, so as to notify the operator in the main control room of the nuclear power plant of the attention to the abnormality. Then, by processing the abnormality through the corresponding processing scheme, the time of human judgment and possible errors can be reduced, and the intervention efficiency of the operator in the main control room can be improved, so as to enhance the control capability of the steam generator water level of the nuclear power plant, solve the challenges faced by the steam generator water level regulation of the nuclear power plant, and reduce the probability of the automatic shutdown of the reactor due to the abnormal steam generator water level in the nuclear power plant.

[0110] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for diagnosing and processing abnormalities of a steam generator of a pressurized water reactor, characterized in that: The following steps are involved: Obtaining operating parameters related to steam generator water level; Performing abnormal diagnosis on the operating parameters and determining abnormal diagnosis results; Outputting prompt information based on the abnormal diagnosis result; Determine a processing scheme corresponding to the abnormal diagnosis result, and perform abnormal processing according to the processing scheme.

2. The method for diagnosing and processing abnormalities of steam generators in a pressurized water reactor according to claim 1, wherein a plurality of main water supply pumps are provided on the main input pipelines of all steam generator loops, and the main water supply pumps are used to deliver water to the steam generators, wherein: The operating parameters include the operating status and outlet pressure value of each main water supply pump, and the abnormality diagnosis of the operating parameters and the abnormality diagnosis results include: determining the main water supply pump in operation according to the operating state; If the outlet pressure value of any running main water supply pump is less than the preset pressure threshold, it is determined that the corresponding main water supply pump has an output shortage abnormality; or, The operating parameters include the operating status and pump flow value of each main water supply pump, and the abnormality diagnosis of the operating parameters and determining the abnormality diagnosis results include: determining the main water supply pump in operation according to the operating state; When the number of operating main water supply pumps is greater than one, if the pump flow deviation of any two main water supply pumps is greater than a preset first flow deviation threshold, it is determined that flow abnormality occurs in the any two main water supply pumps.

3. The abnormality diagnosis and processing method for a pressurized water reactor steam generator according to claim 1, wherein a plurality of main water supply valves are provided on the input pipeline of each steam generator loop, and the main water supply valves are used to adjust the flow delivered to the corresponding steam generator, characterized in that: The operating parameters include the required opening value and the actual opening value of each main water supply valve; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the required opening value of any main water supply valve is greater than the preset first opening threshold and the actual opening does not reach the open limit, or if the required opening value of any main water supply valve is less than the preset second opening threshold and the actual opening does not reach the closed limit; Determine whether the corresponding main water supply valve has a stuck valve abnormality.

4. The method for diagnosing and processing abnormalities of a steam generator in a pressurized water reactor according to claim 3, wherein the input pipeline comprises a main input pipeline, and a main water supply valve is provided on the main input pipeline of each steam generator loop, characterized in that: The operating parameters include the required opening value of the main water supply valve on each main input pipeline; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the demand opening deviation of the main water supply valves on all main input pipelines is greater than a preset opening deviation threshold, it is determined that an abnormal regulation of the main water supply valves on the main input pipelines occurs.

5. The abnormal diagnosis and processing method for a pressurized water reactor steam generator according to claim 1, wherein at least two main water supply flow meters are provided on the input pipeline of each steam generator loop, and the main water supply flow meters are used to measure the water supply flow value of the steam generator, characterized in that: The operating parameters include the water supply flow value measured by each main water supply flow meter; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the deviation of the water supply flow values ​​measured by all the main water supply flow meters of any steam generator loop is greater than a preset second flow deviation threshold, it is determined that a main water supply flow meter abnormality occurs in the corresponding loop.

6. The method for diagnosing and processing abnormalities of a steam generator of a pressurized water reactor according to claim 1, wherein the steam generator is used to convert input water into steam and output steam through an output pipeline, and at least two main steam flow meters are provided on the output pipeline of each steam generator loop, and the main steam flow meter is used to measure the steam flow value output by the steam generator, characterized in that: The operating parameters include the steam flow value measured by each main steam flow meter; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the deviation of the steam flow values ​​measured by all the main steam flow meters of any steam generator loop is greater than a preset third flow deviation threshold, it is determined that a main steam flow meter abnormality occurs in the corresponding loop.

7. The method for diagnosing and processing abnormalities of a steam generator in a pressurized water reactor according to claim 1, wherein at least two main steam pressure gauges are provided on the output pipeline of each steam generator loop, and the main steam pressure gauges are used to measure the steam pressure value output by the steam generator, characterized in that: The operating parameters include the steam pressure value measured by each main steam pressure gauge; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the deviation of the steam pressure values ​​measured by all the main steam pressure gauges of any steam generator loop is greater than a preset pressure deviation threshold, it is determined that a main steam pressure gauge abnormality occurs in the corresponding loop.

8. The method for diagnosing and processing abnormality of a steam generator of a pressurized water reactor according to claim 1, characterized in that: The operating parameters include the liquid level value of each steam generator, the water supply flow value and the nuclear power value of the pressurized water reactor; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the core power value is greater than a preset power threshold, the liquid level value of any steam generator is less than a preset first liquid level threshold, and the water supply flow value is less than a preset first flow threshold, it is determined that the corresponding steam generator has a water supply shortage abnormality; If the core power value is greater than the preset power threshold, the liquid level value of any steam generator is greater than the preset second liquid level threshold, and the water supply flow value is greater than the preset second flow threshold, it is determined that the corresponding steam generator has an excessive water supply abnormality.

9. The method for diagnosing and processing abnormality of a steam generator of a pressurized water reactor according to claim 1, characterized in that: Each steam generator is provided with a plurality of liquid level gauges, and the operating parameters include the liquid level value measured by each liquid level gauge in each steam generator; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: If the deviation of the liquid level values ​​measured by all the liquid level gauges in any steam generator is greater than a preset liquid level deviation threshold, it is determined that a liquid level gauge abnormality occurs in the corresponding steam generator.

10. The method for diagnosing and processing abnormality of a steam generator of a pressurized water reactor according to claim 1, characterized in that: The operating parameters include a water flow value and a steam flow value of each steam generator loop; The performing abnormal diagnosis on the operating parameter and determining the abnormal diagnosis result comprises: Calculating the total water supply flow value and the total steam flow value of all steam generator loops according to the water supply flow value and the steam flow value of each steam generator loop respectively; If the deviation between the total water supply flow value and the total steam flow value is greater than a preset fourth flow deviation threshold, it is determined that an abnormal deviation between the total water supply flow value and the total steam flow value occurs.

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