Method and system for determining alarm threshold of electromagnetic environment early warning of nuclear power plant

Abstract

The application discloses a kind of nuclear power plant electromagnetic environment early warning alarm threshold determination method, alarm threshold determination system, electronic equipment and medium, the method includes the following steps: determining the type of electromagnetic environment measuring sensor, and determining alarm reference limit based on the type of electromagnetic environment measuring sensor;Determine the electromagnetic safety margin adjusted based on electromagnetic environment measuring sensor corresponding alarm reference limit;The alarm threshold of electromagnetic environment early warning is obtained by adjusting the alarm reference limit by the electromagnetic safety margin.The alarm threshold determination method of the application can set up the alarm threshold of electromagnetic environment early warning, evaluate the electromagnetic environment severity of nuclear power unit, so as to make a reminder when electromagnetic environment exceeds alarm limit, reduce the risk of nuclear power unit due to electromagnetic environment change to equipment safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic environment monitoring, in particular to a method for determining an alarm threshold for electromagnetic environment early warning of a nuclear power plant, a system for determining an alarm threshold for electromagnetic environment early warning of a nuclear power plant, an electronic device and a computer readable storage medium. BACKGROUND

[0002] Due to the large number of nuclear power unit devices, complex layout and different states, the electromagnetic environment of the nuclear power plant is harsh, complex and changeable, and the nuclear power plant is facing increasing electromagnetic interference risks. The risk of electromagnetic interference of the device is also gradually increasing. At the same time, more and more advanced devices, control systems and wireless devices are put into use, resulting in a very complex layout relationship of power supply, devices, cables and sensors in the nuclear power device room, making the electromagnetic environment of the nuclear power unit more harsh and difficult to predict. In addition, the electromagnetic sensitivity of the nuclear power device is also increasingly sensitive, and the bidirectional changes of the internal conditions and external environment make the nuclear power device face huge electromagnetic interference risks, and the probability of electromagnetic interference events is increasing. It is very important to provide real-time, unified and reliable electromagnetic sensitive parameters for the staff in the nuclear power plant to facilitate timely early warning of the electromagnetic environment in the nuclear power plant.

[0003] However, the basic situation of the electromagnetic environment during the operation of the nuclear power unit is not clear, the probability of electromagnetic interference cannot be predicted, and the electromagnetic safety risk level of the nuclear power unit cannot be controlled. Therefore, the innovation research and safe operation of the nuclear power unit have brought great challenges. We urgently need a method that can comprehensively perceive and warn the electromagnetic environment of the nuclear power plant to realize comprehensive perception of the electromagnetic environment of the nuclear power plant and analyze and warn the risk level of the electromagnetic environment of the nuclear power plant. At the same time, long-term accumulation of test data and experience can provide technical support for electromagnetic compatibility design research of the nuclear power unit.

[0004] In the process of monitoring the electromagnetic environment of the nuclear power plant, not only electromagnetic data collection but also data analysis are required, so it is necessary to determine the electromagnetic environment alarm threshold to judge the severity of the electromagnetic environment in the nuclear power unit, so as to give corresponding prompts under different electromagnetic environment severity. However, it is not clear how to determine the electromagnetic environment alarm threshold of the nuclear power plant. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a method for determining an alarm threshold for electromagnetic environment early warning of a nuclear power plant, a system for determining an alarm threshold for electromagnetic environment early warning of a nuclear power plant, an electronic device and a computer readable storage medium, which can set the alarm threshold for electromagnetic environment early warning, evaluate the severity of the electromagnetic environment of the nuclear power unit, and thus remind when the electromagnetic environment exceeds the alarm limit, reducing the risk of device safety caused by changes in the electromagnetic environment of the nuclear power unit.

[0006] The purpose of the application is achieved by the technical scheme that a kind of alarm threshold determination method for nuclear power plant electromagnetic environment early warning, comprising the following steps:

[0007] Determine the type of electromagnetic environment measurement sensor, and determine the alarm reference limit based on the type of electromagnetic environment measurement sensor;

[0008] When determining the alarm reference limit, the electromagnetic alarm reference limit based on the standard is used, including the following three types:

[0009] The first type, the alarm reference limit based on electromagnetic emission, when the measured area of nuclear power plant exists radio receiving equipment, the electromagnetic environment of its area needs to be monitored and warned, and this type of alarm limit value can be selected to develop method. The alarm reference limit based on electromagnetic emission is simply called electromagnetic radiation emission limit value, and mainly functions to protect the electromagnetic compatibility of radio receiving equipment, with the characteristics of the lowest limit value, the most stringent limit value and high alarm sensitivity. Radio receiving equipment is sensitive to electromagnetic emission, and for this type of alarm reference limit, the change of electromagnetic signal in the environment can be quickly identified, and the characteristics of small power, high sensitivity and high signal-to-noise ratio of radio equipment are solved. The electromagnetic emission level of non-working intentional electromagnetic emission equipment is monitored and inhibited, and electromagnetic jitter, mutation and abnormal conditions can be immediately identified to ensure the absolute electromagnetic safety of the working area radio equipment, and is suitable for the development of electromagnetic early warning limit value line in the installation environment of 5G and other wireless communication equipment in nuclear power plant;

[0010] The second type, the alarm reference limit based on electromagnetic sensitivity, when the measured area of nuclear power plant exists high-power equipment, the electromagnetic environment of its area needs to be monitored and warned, and this type of alarm limit value can be selected to develop method. The alarm reference limit based on electromagnetic sensitivity can also be called electromagnetic sensitivity anti-interference limit value, and mainly functions to protect the electromagnetic compatibility of high-power equipment, with the characteristics of high limit value, loose limit value and low alarm sensitivity. High-power equipment is slow to react to electromagnetic emission, and for this type of alarm reference limit, the electromagnetic tolerance is high, this method can eliminate the influence of occasional electromagnetic signal changes in the environment, avoid false alarm problems in nuclear power warning, monitor and inhibit the occurrence of strong electromagnetic interference signals in nuclear power plant, remove the influence of device jitter, start-stop and other low-frequency, transient conditions, and ensure the electromagnetic safety level of nuclear power plant overall area, and is suitable for the development of electromagnetic early warning limit value line in the overall electromagnetic environment of nuclear power plant and the room of high-power equipment;

[0011] The third type of alarm reference limit based on the combination of electromagnetic emission and electromagnetic sensitivity. When there are electromagnetic sensors and other equipment in the measured area of the nuclear power plant, the electromagnetic environment of the area needs to be monitored and warned. This type of alarm limit value can be selected. This alarm limit value combines two types of limits. The electromagnetic radiation emission limit is used as the highest level limit for alarm. The electromagnetic sensitivity immunity limit is used as the lowest level limit for alarm. This method combines the advantages of the first and second types. The highest level limit can detect the existence of electromagnetic fluctuations in time. The lowest level limit can judge the risk degree of interference, giving enough electromagnetic safety margin between warning and alarm. This type of alarm limit setting method is suitable for equipment with high electromagnetic sensitivity and electromagnetic immunity. When the electromagnetic environment changes, it can remind but not quickly appear electromagnetic interference risk. It is suitable for setting electromagnetic alarm limit lines for electromagnetic flow meters and other sensor devices in nuclear power plants.

[0012] The electromagnetic safety margin is determined based on the adjustment of the alarm reference limit of the electromagnetic environment measurement sensor.

[0013] The electromagnetic safety margin refers to the difference between the electromagnetic sensitivity threshold and the actual interference signal level in the environment, expressed in decibels.

[0014] The electromagnetic safety margin is divided into different requirement levels according to the electromagnetic compatibility design requirements of the environment measured by the electromagnetic environment measurement sensor.

[0015] Optionally, the electromagnetic safety margin of M0, M2, and M10 can be selected.

[0016] The electromagnetic safety margin M0 represents the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level as 0 dB, i.e. the two limit values are equal, suitable for situations without safety margin requirements.

[0017] The electromagnetic safety margin M2 represents the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level as 6 dB, i.e. the electromagnetic sensitivity threshold level is twice the actual electromagnetic interference signal level, which can ensure that at least 50% of the actual electromagnetic interference signal noise changes within the electromagnetic safety margin range. It is suitable for areas where the nuclear power plant electronic equipment runs smoothly, the nuclear power plant equipment has no frequent start and stop, the power, voltage, current, communication, etc. have no large changes, the electromagnetic compatibility design level of the equipment is high, and the electromagnetic interference signal level fluctuation is small. It is generally required for electromagnetic safety margin.

[0018] The electromagnetic safety margin M10 is represented as a difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level of 20 dB, i.e. the electromagnetic sensitivity threshold level is 10 times the actual electromagnetic interference signal level, which can ensure that 90% of the actual electromagnetic interference signal noise varies within the electromagnetic safety margin range; the electromagnetic safety margin is suitable for a region where the nuclear power plant equipment is frequently started and stopped, and the power, voltage, current, communication and other random changes, the actual electromagnetic interference signal level fluctuation randomness is large, and the electromagnetic safety margin requirement is high.

[0019] The alarm threshold of the electromagnetic environment early warning is obtained by adjusting the alarm reference limit value through the electromagnetic safety margin, i.e. the alarm threshold of the electromagnetic environment early warning is obtained by combining the alarm reference limit value and the electromagnetic safety threshold and adjusting the alarm reference limit value through the electromagnetic safety margin;

[0020] Since the electromagnetic safety margin has multiple different levels, the alarm threshold of the electromagnetic environment early warning can be divided into multiple safety levels with gradients according to different levels of the electromagnetic safety margin requirements, thereby obtaining the alarm threshold of the electromagnetic environment early warning system with multiple levels with gradients, including a first limit value (also referred to as a green limit value), a second limit value (also referred to as a yellow limit value) and a third limit value (also referred to as a red limit value), and the specific process includes:

[0021] Selecting an electromagnetic alarm reference limit value L and an electromagnetic safety margin M:

[0022] When the selected electromagnetic alarm reference limit value is the electromagnetic emission-based alarm reference limit value Li, for the first limit value L1 in the alarm threshold, the electromagnetic emission-based alarm reference limit value Li is used, i.e. L1=Li+M0; for the second limit value L2 in the alarm threshold, M2 is added to the electromagnetic emission-based alarm reference limit value Li, i.e. L2=Li+M2; for the third limit value L3 in the alarm threshold, M10 is added to the electromagnetic emission-based alarm reference limit value Li, i.e. L3=Li+M10;

[0023] When the selected electromagnetic alarm reference limit value is the electromagnetic sensitivity-based alarm reference limit value Ls, for the third limit value L3 in the alarm threshold, the electromagnetic sensitivity-based alarm reference limit value Ls is used, i.e. L3=Ls-M0; for the second limit value L2 in the alarm threshold, M2 is subtracted from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L2=Ls-M2; for the first limit value L1 in the alarm threshold, M10 is subtracted from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls-M10;

[0024] When the selected electromagnetic alarm reference limit value is the alarm reference limit value based on the combination of electromagnetic emission and electromagnetic sensitivity, for the first limit value L1 in the alarm threshold, it is equivalent to use the alarm reference limit value based on electromagnetic emission Li, i.e. L1=Li+M0; for the second limit value L2 in the alarm threshold, it is obtained by adding M2 to the alarm reference limit value based on electromagnetic emission Li, i.e. L2=Li+M2, and for the third limit value L3 in the alarm threshold, it is equivalent to use the alarm reference limit value based on electromagnetic sensitivity Ls, i.e. L3=Ls+M0.

[0025] Based on the same inventive concept, the present application also provides an alarm threshold determination system for electromagnetic environment early warning of a nuclear power plant, the system comprising:

[0026] an alarm reference limit value determination module configured to determine the type of electromagnetic environment measurement sensor and determine the alarm reference limit value based on the type of electromagnetic environment measurement sensor;

[0027] an electromagnetic safety margin determination module configured to determine the electromagnetic safety margin adjusted on the basis of the alarm reference limit value of the electromagnetic environment measurement sensor;

[0028] an adjustment module configured to adjust the alarm reference limit value by the electromagnetic safety margin to obtain the alarm threshold for electromagnetic environment early warning.

[0029] Further, the electromagnetic safety margin is divided into different requirement levels according to the electromagnetic compatibility design requirements of the environment measured by the electromagnetic environment measurement sensor;

[0030] The adjustment module is further configured to divide the alarm threshold for electromagnetic environment early warning into a plurality of safety levels with gradient according to the different requirement levels of the electromagnetic safety margin.

[0031] Further, the alarm reference limit value determination module is specifically configured to:

[0032] when determining the alarm reference limit value, use the standard-based electromagnetic alarm reference limit value, the standard-based electromagnetic alarm reference limit value comprising:

[0033] an alarm reference limit value based on electromagnetic emission to protect the electromagnetic compatibility of radio receiving equipment, quickly identify the change of electromagnetic signal in the environment, monitor and suppress the electromagnetic emission level of non-working intentional electromagnetic emission equipment;

[0034] an alarm reference limit value based on electromagnetic sensitivity to protect the electromagnetic compatibility of high-power equipment and eliminate the influence of occasional electromagnetic signal change in the environment;

[0035] The alarm reference limit value is based on the fusion of electromagnetic emission and electromagnetic sensitivity, the electromagnetic emission limit value is used as the limit value of the highest alarm level, and the electromagnetic sensitivity limit value is used as the limit value of the lowest alarm level to protect the electromagnetic compatibility of the electromagnetic sensor equipment.

[0036] Further, the electromagnetic safety margin is the difference between the relative values of the electromagnetic sensitivity threshold level and the actual interference signal level in the environment, including three levels of electromagnetic safety margin M0, M2 and M10:

[0037] The electromagnetic safety margin M0 represents the difference of 0 dB between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level.

[0038] The electromagnetic safety margin M2 represents the difference of 6 dB between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level.

[0039] Further, the alarm threshold of the electromagnetic environment early warning includes multiple safety levels, including a first limit value, a second limit value and a third limit value.

[0040] The adjustment module is specifically further configured to:

[0041] When the selected electromagnetic alarm reference limit value is the alarm reference limit value based on electromagnetic emission Li, for the first limit value L1 in the alarm threshold, it is equivalent to using the alarm reference limit value based on electromagnetic emission Li, that is, L1=Li+M0, for the second limit value L2 in the alarm threshold, it is obtained by adding M2 based on the alarm reference limit value based on electromagnetic emission Li, that is, L2=Li+M2, for the third limit value L3 in the alarm threshold, it is obtained by adding M10 based on the alarm reference limit value based on electromagnetic emission Li, that is, L3=Li+M10.

[0042] When the selected electromagnetic alarm reference limit value is the alarm reference limit value based on electromagnetic sensitivity Ls, for the third limit value L3 in the alarm threshold, it is equivalent to using the alarm reference limit value based on electromagnetic sensitivity Ls, that is, L3=Ls-M0; for the second limit value L2 in the alarm threshold, it is obtained by subtracting M2 based on the alarm reference limit value based on electromagnetic sensitivity Ls, that is, L2=Ls-M2, for the first limit value L1 in the alarm threshold, it is obtained by subtracting M10 based on the alarm reference limit value based on electromagnetic sensitivity Ls, that is, L3=Ls-M10.

[0043] When the selected electromagnetic alarm reference limit is the alarm reference limit based on the combination of electromagnetic emission and electromagnetic sensitivity, for the first limit L1 in the alarm threshold, it is equal to the alarm reference limit based on electromagnetic emission Li, that is, L1=Li+M0; for the second limit L2 in the alarm threshold, it is obtained by adding M2 to the alarm reference limit based on electromagnetic emission Li, that is, L2=Li+M2, and for the third limit L3 in the alarm threshold, it is equal to the alarm reference limit based on electromagnetic sensitivity Ls, that is, L3=Ls+M0.

[0044] The beneficial effects of the present application are that the present application can evaluate the electromagnetic environment severity of a nuclear power unit, remind when the value of electromagnetic data exceeds the alarm limit, so as to formulate a scientific alarm scheme, and when the electromagnetic environment of the nuclear power unit appears abnormal, the early warning system can timely make a judgment and remind the staff to actively take effective measures, reduce the risk of the nuclear power unit caused by the change of electromagnetic environment to the safety of the equipment, and ensure the normal operation of various functions in the operation process of the nuclear power unit. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A flowchart of a nuclear power plant electromagnetic environment early warning alarm threshold determination method provided by the embodiment one of the present application is shown in the figure;

[0046] Figure 2 A principle diagram of a nuclear power plant electromagnetic environment early warning alarm threshold determination process provided by the embodiment one of the present application is shown in the figure;

[0047] Figure 3 A schematic diagram of electromagnetic safety margin provided by the embodiment one of the present application is shown in the figure;

[0048] Figure 4 A flowchart of a multi-level electromagnetic environment early warning alarm threshold determination provided by the embodiment one of the present application is shown in the figure;

[0049] Figure 5 A spatial field antenna alarm threshold diagram based on electromagnetic emission provided by the embodiment one of the present application is shown in the figure;

[0050] Figure 6 A spatial field antenna alarm threshold diagram based on electric field immunity provided by the embodiment one of the present application is shown in the figure;

[0051] Figure 7 An antenna alarm threshold diagram based on the combination of electric field emission and immunity provided by the embodiment one of the present application is shown in the figure.

[0052] Figure 8 An architecture diagram of a nuclear power plant electromagnetic environment early warning alarm threshold determination system provided by the embodiment two of the present application is shown in the figure;

[0053] Figure 9Figure. 1 is an architecture diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments and drawings described herein are merely for the purpose of explaining the present application, and not for limiting the present application.

[0055] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence; and, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

[0056] In the embodiments of the present application, the terms used are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0057] In the subsequent description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the purpose of facilitating the description of the present application, and have no specific meaning. Therefore, "module", "component", or "unit" can be used mixedly. The technical solutions of the present application will be described in further detail below in conjunction with the accompanying drawings, but the scope of protection of the present application is not limited to the following description.

[0058] The present application is mainly applied to the process of comprehensive perception and early warning monitoring of electromagnetic environment in nuclear power plants, and is used to solve the problem of setting alarm threshold in monitoring. During monitoring, the monitoring and early warning can be carried out through the design of the monitoring and control software platform of the comprehensive perception and early warning system of the electromagnetic environment in nuclear power plants. For such a nuclear power electromagnetic monitoring and control software platform, not only electromagnetic data acquisition but also data analysis are required to judge the severity of the electromagnetic environment in the nuclear power unit and give corresponding prompts under different electromagnetic environment severity.

[0059] The application provides a method for judging the electromagnetic environment severity of a nuclear power unit, that is, a multi-level electromagnetic environment alarm threshold is formulated to evaluate the electromagnetic environment severity of the nuclear power unit, and a warning is given when the electromagnetic data value exceeds the alarm limit, so that a scientific alarm scheme is formulated. In order to obtain the electromagnetic environment alarm threshold, the electromagnetic environment severity of the nuclear power unit is evaluated, and a prompt is given when the electromagnetic data value exceeds the alarm limit. When the electromagnetic environment of the nuclear power unit changes abnormally, the early warning system can timely make a judgment and record, remind the staff to take effective measures, reduce the risk of the nuclear power unit caused by the change of the electromagnetic environment, and ensure the normal operation of the nuclear power unit during operation.

[0060] The basic principle of formulating the multi-level electromagnetic environment alarm threshold is that it cannot be too strict to cause "false alarm", nor too loose to cause "miss alarm". The normal fluctuation of the electromagnetic environment of the nuclear power unit during normal operation is allowed, and the alarm threshold can be adjusted for different positions, different electromagnetic characteristics, different frequencies and different times. Specifically, the following embodiments are described:

[0061] As shown in Figure 1 and Figure 2 , a method for determining an alarm threshold of a nuclear power plant electromagnetic environment early warning is provided for the first embodiment of the application, Figure 1 a flowchart of the method for determining an alarm threshold of a nuclear power plant electromagnetic environment early warning, Figure 2 a schematic diagram of the principle of the alarm threshold determination process of the nuclear power plant electromagnetic environment early warning, the method comprising the following steps:

[0062] Step S101: determining the type of electromagnetic environment measurement sensor, and determining the alarm reference limit based on the type of electromagnetic environment measurement sensor;

[0063] When determining the alarm reference limit, the selection of the alarm reference limit of the electromagnetic environment early warning system is the basis for formulating the multi-level alarm threshold. In order to meet the different scenarios and actual needs of the nuclear power unit, it cannot be "false alarm" nor "miss alarm", and the alarm threshold can be adjusted for different positions, different electromagnetic characteristics, different frequencies and different times. The nuclear power unit electromagnetic environment comprehensive perception and early warning have a good applicable range. The application embodiment proposes to use a standard-based electromagnetic alarm reference limit, which is based on electromagnetic compatibility test standards, and is divided into three methods of alarm reference limit based on electromagnetic emission, electromagnetic sensitivity and the combination of the two.

[0064] The advantage of the standard-based alarm reference limit value is that the nuclear power unit equipment is designed and tested in accordance with the corresponding electromagnetic compatibility test standard before being allowed to be installed and put into use, and can meet the corresponding test certification level requirements. Therefore, to solve the difference of alarm limit values of different point sensors and simplify the difficulty of alarm limit value formulation, a series of alarm limit values should be formulated for different types of sensors by referring to the test standard and combining with the electromagnetic safety margin. The standard specification widely used in nuclear power plants is selected, and the test items are cut or expanded, so as to form a flexible and operable electromagnetic alarm threshold. This method is very suitable for the scene of nuclear power plant in the design verification stage after strict electromagnetic compatibility design management, without the need for on-site electromagnetic test data or for a certain device to test the overall electromagnetic environment of the measured position of the nuclear power plant.

[0065] As shown in Figure 3 The electromagnetic alarm reference limit value based on the standard includes the following three types. In the electromagnetic compatibility test standard, the limit value of electromagnetic emission is generally lower than that of electromagnetic sensitivity. Each type of electromagnetic alarm reference limit value has its own advantages, and can be selected according to the actual situation:

[0066] The first type is the alarm reference limit value based on electromagnetic emission. This type of limit value is used to protect the electromagnetic compatibility of radio receiving equipment, has the characteristics of the lowest limit value, the strictest limit, and the highest alarm sensitivity. It is used for the formulation of the alarm reference limit value of the radio receiving equipment in the nuclear power plant. The radio receiving equipment is sensitive to electromagnetic emission. This method can quickly identify the changes of electromagnetic signals in the environment, solve the characteristics of small power, high sensitivity, and high signal-to-noise ratio of radio equipment. It can monitor and suppress the electromagnetic emission level of non-working intentional electromagnetic emission equipment, and can immediately identify electromagnetic jitter, sudden changes, and abnormal situations to ensure the absolute electromagnetic safety of the radio equipment in the working area, and is suitable for the formulation of electromagnetic early warning limit value in the installation environment of 5G wireless communication equipment in the nuclear power plant;

[0067] The second type is the alarm reference limit value based on electromagnetic sensitivity. This type of limit value is used to protect the electromagnetic compatibility of nuclear power equipment, has the characteristics of the highest limit value, the most lenient limit, and the lowest alarm sensitivity. It is used for the formulation of the alarm reference limit value of high-power equipment in the nuclear power plant. High-power equipment has a slow response to electromagnetic emission and high electromagnetic tolerance. This method can eliminate the influence of occasional electromagnetic signal changes in the environment and avoid false alarm problems in nuclear power early warning. It can monitor and suppress the occurrence of strong electromagnetic interference signals in the nuclear power plant, remove the influence of device jitter, start-stop, and other low-frequency, transient situations, and ensure the electromagnetic safety level of the overall area of the nuclear power plant. It is suitable for the formulation of electromagnetic early warning limit value in the overall electromagnetic environment of the nuclear power plant and the room of high-power equipment;

[0068] The third type is based on the combination of electromagnetic emission and electromagnetic sensitivity. The combination of the two types of limits is adopted, the electromagnetic emission limit is used as the highest level limit for alarm, and the electromagnetic sensitivity limit is used as the lowest level limit for alarm. This method combines the advantages of the first type and the second type, the highest level limit can timely find the existence of electromagnetic fluctuation, the lowest level limit can judge the risk degree of interference, and sufficient electromagnetic safety margin is given between warning and alarm. This type of alarm limit setting method is suitable for devices with high electromagnetic sensitivity and electromagnetic immunity. When the electromagnetic environment changes, it can remind but will not quickly appear electromagnetic interference risk. It is suitable for setting electromagnetic alarm limit line for electromagnetic flow meter and other sensor devices in nuclear power plants.

[0069] Step S201: Determine the electromagnetic safety margin adjusted on the basis of the alarm reference limit of the electromagnetic environment measurement sensor;

[0070] The electromagnetic safety margin refers to the difference between the sensitivity threshold and the actual interference signal level in the environment, expressed in decibels. The electromagnetic safety margin is divided into different requirement levels according to the electromagnetic compatibility design requirements of the environment measured by the electromagnetic environment measurement sensor. Thus, the alarm threshold of the electromagnetic environment early warning is divided into multiple safety levels with gradient according to the different requirement levels of the electromagnetic safety margin

[0071] Optionally, three electromagnetic safety margins M0, M2 and M10 can be selected. In order to adjust the limits of different alarm thresholds in multi-level alarm threshold setting, facilitate the operability and flexibility of threshold setting, the electromagnetic safety margin is given a certain value expressed in decibels, and common safety margin values are given. In the analysis, it can be directly used;

[0072] The electromagnetic safety margin M0 represents the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level as 0dB, i.e. the two limit values are equal, which is suitable for the case without safety margin requirement;

[0073] The electromagnetic safety margin M2 represents the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level as 6dB, i.e. the electromagnetic sensitivity threshold level is twice the actual electromagnetic interference signal level, which can ensure that at least 50% of the actual electromagnetic interference signal noise changes within the electromagnetic safety margin range. It is suitable for the case where the electromagnetic interference signal level fluctuation is small, the electromagnetic compatibility design level of the device is high, the nuclear power plant electronic device runs smoothly, the nuclear power plant device has no frequent start and stop, and the power, voltage, current, communication and other parameters have no large changes. It is suitable for the case of general electromagnetic safety margin requirement;

[0074] The electromagnetic safety margin M10 is represented as a difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level of 20 dB, i.e. the electromagnetic sensitivity threshold level is 10 times the actual electromagnetic interference signal level, which can ensure that 90% of the actual electromagnetic interference signal noise varies within the electromagnetic safety margin range; it is suitable for the area where the nuclear power plant equipment is frequently started and stopped, the power, voltage, current, communication and other random changes, the actual electromagnetic interference signal level fluctuation randomness is large, and the electromagnetic safety margin requirement is high.

[0075] Step S103: adjusting the alarm reference limit value by the electromagnetic safety margin to obtain an alarm threshold of the electromagnetic environment early warning;

[0076] The alarm reference limit value is combined with the electromagnetic safety threshold value, the reference limit value is adjusted by the electromagnetic safety margin to obtain a gradient multi-level electromagnetic environment early warning system alarm threshold: since the electromagnetic safety margin has multiple different levels, the electromagnetic environment early warning alarm threshold can be divided into multiple safety levels with gradient according to the different levels of the electromagnetic safety margin, thereby obtaining a gradient multi-level electromagnetic environment early warning system alarm threshold, including a first limit value (also known as a green limit value), a second limit value (also known as a yellow limit value) and a third limit value (also known as a red limit value), and the specific process includes:

[0077] As shown in Figure 4 , the specific process is as follows:

[0078] Select an electromagnetic alarm reference limit value L and an electromagnetic safety margin M:

[0079] When the selected electromagnetic alarm reference limit value is the electromagnetic emission-based alarm reference limit value Li, for the first limit value L1 in the alarm threshold, it is equivalent to use the electromagnetic emission-based alarm reference limit value Li, i.e. L1=Li+M0, for the second limit value L2 in the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit value Li, i.e. L2=Li+M2, for the third limit value L3 in the alarm threshold, it is obtained by adding M10 to the electromagnetic emission-based alarm reference limit value Li, i.e. L3=Li+M10;

[0080] When the selected electromagnetic alarm reference limit value is the electromagnetic sensitivity-based alarm reference limit value Ls, for the third limit value L3 in the alarm threshold, it is equivalent to use the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls-M0; for the second limit value L2 in the alarm threshold, it is obtained by subtracting M2 from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L2=Ls-M2, for the first limit value L1 in the alarm threshold, it is obtained by subtracting M10 from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls-M10;

[0081] When the selected electromagnetic alarm reference limit is an alarm reference limit that combines electromagnetic emission and electromagnetic sensitivity, for the first-level limit L1 in the alarm threshold, it is equivalent to the electromagnetic emission-based alarm reference limit Li, that is, L1 = Li + M0; for the second-level limit L2 in the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit Li, that is, L2 = Li + M2; for the third-level limit L3 in the alarm threshold, it is equivalent to the electromagnetic sensitivity-based alarm reference limit Ls, that is, L3 = Ls + M0.

[0082] In the embodiments of this application, taking a space field antenna as an example, alarm thresholds are defined from three aspects: electromagnetic emission-based, electromagnetic susceptibility-based, and a combination of both. The space field antenna's function is to measure radio field radiated emissions in nuclear power plant reference space, with the measurement unit expressed in dBμV / m. Alarm limits for the 1MHz–18GHz frequency band, as well as standards for electric field radiated emissions and electric field immunity, are established.

[0083] 1) Alarm threshold based on electric field emission limit

[0084] The alarm limits for space field antennas are based on the limits for electric field radiation emission, and are adjusted or tightened step by step in combination with electromagnetic safety margins to formulate multi-level antenna alarm limits.

[0085] Based on the limits for electric field radiation emission and with reference to electromagnetic safety margins, multiple levels of alarm limits are established, as shown in Table 1 below.

[0086] Table 1: Antenna Alarm Limits Based on Electromagnetic Emission

[0087]

[0088] Limit curves as follows Figure 5 As shown in the table, f represents the frequency. The triangular-marked curve in the 1MHz to 10GHz frequency band represents the reference limit for electric field radiated emissions. The Level 1 limit curve serves as the most stringent requirement for electric field emissions, which is the Level 1 alarm limit. The Level 2 alarm limit is defined by relaxing the Level 1 limit by 6dB (i.e., moving the limit line up by 6dB), and is represented by the diamond-marked curve. Similarly, the Level 3 alarm limit is defined by relaxing the Level 1 limit by 20dB (i.e., moving the limit line up by 20dB), and is represented by the square-marked curve.

[0089] 2) Alarm threshold based on electric field immunity limit (i.e. alarm baseline limit based on electromagnetic susceptibility)

[0090] When setting antenna alarm thresholds, the standard limit for electric field immunity can be used as a reference, and the antenna alarm limit can be set based on the electric field immunity limit.

[0091] As shown in Table 2 below. The reference limit value is 140 dBμV / m in the frequency band of 1 MHz-18 GHz. According to the electromagnetic safety margin, the multi-level antenna alarm limit value based on the electric field immunity is formulated, which maximizes the differences brought by different types of equipment, thereby ensuring the universality of the alarm limit value.

[0092] Table 2: Space field antenna alarm threshold based on electric field immunity

[0093]

[0094] The limit curve is shown in Figure 6 The three-level curve is the electric field radiation immunity limit value of 140 dBμV / m. Taking the three-level limit value as the reference, the highest level of near-field electric field probe alarm is the three-level alarm limit value, which is the square-marked curve. On the basis of the three-level limit value, the alarm limit value of the second level is 6 dB stricter, i.e., the limit line is lowered by 6 dB, which is the diamond-marked curve. Similarly, on the basis of the three-level limit value, the alarm limit value of the first level is 20 dB stricter, i.e., the limit line is lowered by 20 dB, which is the triangle-marked curve.

[0095] 3) Alarm threshold based on the integration of electric field emission and immunity

[0096] For the antenna alarm limit value, the integration of electric field emission and immunity can also be referred to for formulation. In combination with the characteristics of the emission and immunity standard limit values described above, both the situation of being too strict caused by only using the emission limit value and the situation of being too loose caused by only using the immunity limit value are solved.

[0097] Based on the electric field emission and immunity limit values, and in reference to the electromagnetic safety margin, the multi-level alarm limit value is formulated, as shown in Table 3 below.

[0098] Table 3: Space field antenna alarm threshold based on the integration of electric field emission and immunity

[0099]

[0100] The limit curve is shown in Figure 7 The three-level limit value is the immunity standard reference limit value, which is the maximum limit value of the alarm, i.e., the three-level alarm limit value, which is the square-marked curve. The first-level limit value is the emission standard reference limit value, which is the first-level alarm limit value, which is the triangle-marked curve. It is found by comparison that the emission reference limit value is stricter than the immunity limit value, with a maximum difference of 81 dB and a minimum difference of 60 dB, which leaves a very large gradient for the alarm limit value. In order to further meet the multi-level characteristics of the alarm threshold, the second-level alarm limit value is formulated by relaxing 20 dB on the basis of the first-level limit value, i.e., the limit line is raised by 20 dB, which is the diamond-marked curve.

[0101] In summary, the application evaluates electromagnetic safety threats of electromagnetic environment of a nuclear power plant to equipment therein, and gives an alarm threshold setting method of an electromagnetic sensor of an electromagnetic environment early warning system. In combination with signal characteristics of the electromagnetic sensor, the alarm threshold setting is completed in two steps. By determining an alarm reference limit value of the electromagnetic sensor, and adjusting the reference limit value by an electromagnetic safety margin in combination with actual conditions, a gradient multi-level alarm threshold of the electromagnetic environment early warning system is obtained. The application gives a method for judging severity of electromagnetic environment of a nuclear power unit, i.e. a multi-level electromagnetic environment alarm threshold is set, severity of electromagnetic environment of the nuclear power unit is evaluated, and a reminder is given when a value of electromagnetic data exceeds the alarm limit value, so that a scientific alarm mechanism is set. When an abnormal condition occurs in the electromagnetic environment of the nuclear power unit, the early warning system can timely make a judgment and remind the staff to actively take effective measures, so as to reduce risks of the nuclear power unit caused by changes of the electromagnetic environment to equipment safety, and ensure normal operation of various functions in the operation process of the nuclear power unit. The electromagnetic alarm threshold of the nuclear power unit is neither too strict to cause a false alarm, nor too loose to cause a missed alarm, and normal fluctuations of the electromagnetic environment of the nuclear power unit in normal operation are allowed. On the basis of arranging different types of electromagnetic environment data measurement at different positions of the nuclear power plant, the electromagnetic environment is monitored and collected in real time; and in combination with the electromagnetic environment alarm threshold of the nuclear power plant, electromagnetic risks of the measured points are pre-judged, and a reasonable prompt is given; electromagnetic interference events are effectively identified and avoided, and electromagnetic risk factors are discovered, warned and treated early.

[0102] Figure 8 An architecture diagram of an alarm threshold determination system of a nuclear power plant electromagnetic environment early warning provided by the second embodiment of the application is shown in Figure 8 The system comprises:

[0103] An alarm reference limit value determination module 11 is configured to determine a type of the electromagnetic environment measurement sensor, and determine an alarm reference limit value based on the type of the electromagnetic environment measurement sensor;

[0104] An electromagnetic safety margin determination module 12 is configured to determine an electromagnetic safety margin adjusted on the basis of the alarm reference limit value of the electromagnetic environment measurement sensor;

[0105] An adjustment module 13 is configured to adjust the alarm reference limit value by the electromagnetic safety margin, and obtain an alarm threshold of the electromagnetic environment early warning.

[0106] Further, the electromagnetic safety margin is divided into different requirement levels according to electromagnetic compatibility design requirements of the environment measured by the electromagnetic environment measurement sensor;

[0107] The adjustment module 13 is further configured to divide the alarm threshold of the electromagnetic environment early warning into multiple safety levels with gradient according to different requirement levels of electromagnetic safety margin.

[0108] Further, the alarm reference limit value determination module 11 is specifically configured to:

[0109] In the determination of the alarm reference limit value, a standard-based electromagnetic alarm reference limit value is adopted, which includes:

[0110] An alarm reference limit value based on electromagnetic emission is adopted to protect the electromagnetic compatibility of radio receiving equipment, quickly identify the change of electromagnetic signal in the environment, monitor and suppress the electromagnetic emission level of non-working intentional electromagnetic emission equipment;

[0111] An alarm reference limit value based on electromagnetic sensitivity is adopted to protect the electromagnetic compatibility of high-power equipment and eliminate the influence of occasional electromagnetic signal change in the environment;

[0112] An alarm reference limit value based on the integration of electromagnetic emission and electromagnetic sensitivity is adopted, which uses the electromagnetic emission limit value as the limit value of the highest alarm level and uses the electromagnetic sensitivity limit value as the limit value of the lowest alarm level to protect the electromagnetic compatibility of electromagnetic sensor equipment.

[0113] Further, the electromagnetic safety margin is the difference between the relative numerical value of the electromagnetic sensitivity threshold level and the actual interference signal level in the environment, including M0, M2 and M10 three levels of electromagnetic safety margin:

[0114] The electromagnetic safety margin M0 represents that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 0dB;

[0115] The electromagnetic safety margin M2 represents that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 6dB; and the electromagnetic safety margin M10 represents that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 20dB.

[0116] Further, the alarm threshold of the electromagnetic environment early warning includes multiple safety levels, including a first limit value, a second limit value and a third limit value;

[0117] The adjustment module 13 is specifically further configured to:

[0118] When the selected electromagnetic alarm reference limit is the electromagnetic emission-based alarm reference limit Li, for the first-level limit L1 of the alarm threshold, it is equal to the electromagnetic emission-based alarm reference limit Li, i.e. L1 = Li + M0; for the second-level limit L2 of the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit Li, i.e. L2 = Li + M2; for the third-level limit L3 of the alarm threshold, it is obtained by adding M10 to the electromagnetic emission-based alarm reference limit Li, i.e. L3 = Li + M10.

[0119] When the selected electromagnetic alarm reference limit is the electromagnetic sensitivity-based alarm reference limit Ls, for the third-level limit L3 of the alarm threshold, it is equal to the electromagnetic sensitivity-based alarm reference limit Ls, i.e. L3 = Ls + M0; for the second-level limit L2 of the alarm threshold, it is obtained by subtracting M2 from the electromagnetic sensitivity-based alarm reference limit Ls, i.e. L2 = Ls - M2; for the first-level limit L1 of the alarm threshold, it is obtained by subtracting M10 from the electromagnetic sensitivity-based alarm reference limit Ls, i.e. L3 = Ls - M10.

[0120] When the selected electromagnetic alarm reference limit is the alarm reference limit based on the fusion of electromagnetic emission and electromagnetic sensitivity, for the first-level limit L1 of the alarm threshold, it is equal to the electromagnetic emission-based alarm reference limit Li, i.e. L1 = Li + M0; for the second-level limit L2 of the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit Li, i.e. L2 = Li + M2; for the third-level limit L3 of the alarm threshold, it is equal to the electromagnetic sensitivity-based alarm reference limit Ls, i.e. L3 = Ls + M0.

[0121] The alarm threshold determination system for electromagnetic environment early warning of a nuclear power plant of the embodiment of the present disclosure is used to implement the alarm threshold determination method for electromagnetic environment early warning of a nuclear power plant in the method embodiment one, and therefore the description is relatively simple, and the specific implementation can be referred to the related description in the method embodiment one, which will not be described herein.

[0122] In addition, as shown in Figure 9 The embodiment three of the present disclosure further provides an electronic device, including a memory 100 and a processor 200, the memory 100 stores a computer program, and when the processor 200 runs the computer program stored in the memory 100, the processor 200 executes the various possible methods.

[0123] The memory 100 is connected with the processor 200, the memory 100 can adopt a flash memory or a read-only memory or other memories, and the processor 200 can adopt a central processing unit or a single-chip microcomputer.

[0124] In addition, the embodiments of the present disclosure further provide a computer readable storage medium, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the above various possible methods.

[0125] The computer readable storage medium includes volatile or non-volatile, removable or non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, computer program modules or other data. The computer readable storage medium includes but is not limited to RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable read only memory), flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), digital versatile disc (DVD, Digital Video Disc) or other optical disc storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer.

[0126] The above is the preferred embodiment of the present application, it should be understood that the present application is not limited to the form disclosed herein, should not be seen as excluding other embodiments, but can be used in other combinations, modifications and environments, and can be within the scope of the concept described herein, by the above teachings or related art or knowledge to make changes. The changes and variations made by the person skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the appended claims of the present application.

Claims

1. A method for determining an alarm threshold for an electromagnetic environment early warning of a nuclear power plant, characterized in that, The method comprises: determining the type of the electromagnetic environment measurement sensor, and determining the alarm reference limit value based on the type of the electromagnetic environment measurement sensor; and in determining the alarm reference limit value, using a standard-based electromagnetic alarm reference limit value, which comprises: an electromagnetic emission-based alarm reference limit value, to protect the electromagnetic compatibility of radio receiving equipment, quickly identify changes in electromagnetic signals in the environment, monitor and suppress the electromagnetic emission level of non-operating intentional electromagnetic emission equipment; an electromagnetic sensitivity-based alarm reference limit value, to protect the electromagnetic compatibility of power equipment, and eliminate the impact of occasional electromagnetic signal changes in the environment; an electromagnetic emission and electromagnetic sensitivity integrated alarm reference limit value, using the electromagnetic emission limit value as the highest level alarm limit value, and using the electromagnetic sensitivity limit value as the lowest level alarm limit value, to protect the electromagnetic compatibility of electromagnetic sensor equipment; determining an electromagnetic safety margin adjusted on the basis of the corresponding alarm reference limit value of the electromagnetic environment measurement sensor; the electromagnetic safety margin is the difference between the relative values of the electromagnetic sensitivity threshold level and the actual interference signal level in the environment, including M0, M2, and M10 three levels of electromagnetic safety margin: electromagnetic safety margin M0, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 0dB; electromagnetic safety margin M2, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 6dB; electromagnetic safety margin M10, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 20dB; adjusting the alarm reference limit value by the electromagnetic safety margin to obtain the alarm threshold value of the electromagnetic environment early warning; the adjustment of the alarm reference limit value by the electromagnetic safety margin to obtain the alarm threshold value of the electromagnetic environment early warning comprises: when the selected electromagnetic alarm reference limit value is the electromagnetic emission-based alarm reference limit value Li, for the first level limit value L1 in the alarm threshold value, it is equivalent to use the electromagnetic emission-based alarm reference limit value Li, i.e. L1=Li+M0, for the second level limit value L2 in the alarm threshold value, it is obtained by adding M2 based on the electromagnetic emission-based alarm reference limit value Li, i.e. L2=Li+M2, for the third level limit value L3 in the alarm threshold value, it is obtained by adding M10 based on the electromagnetic emission-based alarm reference limit value Li, i.e. L3=Li+M10; when the selected electromagnetic alarm reference limit value is the electromagnetic sensitivity-based alarm reference limit value Ls, for the third level limit value L3 in the alarm threshold value, it is equivalent to use the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls-M0; for the second level limit value L2 in the alarm threshold value, it is obtained by subtracting M2 based on the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L2=Ls-M2, for the first level limit value L1 in the alarm threshold value, it is obtained by subtracting M10 based on the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L1=Ls-M10; When the selected electromagnetic alarm reference limit value is the alarm reference limit value based on the combination of electromagnetic emission and electromagnetic sensitivity, for the first level limit value L1 in the alarm threshold, it is equivalent to use the alarm reference limit value based on electromagnetic emission Li, i.e. L1=Li+M0; for the second level limit value L2 in the alarm threshold, it is obtained by adding M2 to the alarm reference limit value based on electromagnetic emission Li, i.e. L2=Li+M2, and for the third level limit value L3 in the alarm threshold, it is equivalent to use the alarm reference limit value based on electromagnetic sensitivity Ls, i.e. L3=Ls+M0.

2. A system for determining alarm thresholds for early warning of the electromagnetic environment of a nuclear power plant, characterized in that The system comprises: an alarm reference limit value determination module configured to determine the type of the electromagnetic environment measurement sensor and determine the alarm reference limit value based on the type of the electromagnetic environment measurement sensor; and In determining the alarm reference limit value, a standard-based electromagnetic alarm reference limit value is used, which includes: an alarm reference limit value based on electromagnetic emission to protect the electromagnetic compatibility of radio receiving equipment, quickly identify the change of electromagnetic signals in the environment, monitor and suppress the electromagnetic emission level of non-working intentional electromagnetic emission equipment; an alarm reference limit value based on electromagnetic sensitivity to protect the electromagnetic compatibility of power equipment and eliminate the influence of occasional electromagnetic signal changes in the environment; an alarm reference limit value based on the combination of electromagnetic emission and electromagnetic sensitivity, which uses the electromagnetic emission limit value as the limit value of the highest level of alarm and uses the electromagnetic sensitivity limit value as the limit value of the lowest level of alarm to protect the electromagnetic compatibility of electromagnetic sensor equipment; an electromagnetic safety margin determination module configured to determine the electromagnetic safety margin adjusted on the basis of the alarm reference limit value of the electromagnetic environment measurement sensor; the electromagnetic safety margin is the difference between the relative values of the electromagnetic sensitivity threshold level and the actual interference signal level in the environment, including three levels of electromagnetic safety margins M0, M2 and M10: electromagnetic safety margin M0, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 0 dB; electromagnetic safety margin M2, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 6 dB; electromagnetic safety margin M10, indicating that the difference between the electromagnetic sensitivity threshold level and the actual electromagnetic interference signal level is 20 dB; an adjustment module configured to adjust the alarm reference limit value by the electromagnetic safety margin to obtain the alarm threshold of electromagnetic environment early warning; the adjustment of the alarm reference limit value by the electromagnetic safety margin to obtain the alarm threshold of electromagnetic environment early warning includes: When the selected electromagnetic alarm reference limit value is the electromagnetic emission-based alarm reference limit value Li, for the first-level limit value L1 in the alarm threshold, it is equivalent to use the electromagnetic emission-based alarm reference limit value Li, i.e. L1=Li+M0, for the second-level limit value L2 in the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit value Li, i.e. L2=Li+M2, for the third-level limit value L3 in the alarm threshold, it is obtained by adding M10 to the electromagnetic emission-based alarm reference limit value Li, i.e. L3=Li+M10; When the selected electromagnetic alarm reference limit value is the electromagnetic sensitivity-based alarm reference limit value Ls, for the third-level limit value L3 in the alarm threshold, it is equivalent to use the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls-M0; for the second-level limit value L2 in the alarm threshold, it is obtained by subtracting M2 from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L2=Ls-M2, for the first-level limit value L1 in the alarm threshold, it is obtained by subtracting M10 from the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L1=Ls-M10; When the selected electromagnetic alarm reference limit value is the alarm reference limit value based on the integration of electromagnetic emission and electromagnetic sensitivity, for the first-level limit value L1 in the alarm threshold, it is equivalent to use the electromagnetic emission-based alarm reference limit value Li, i.e. L1=Li+M0; for the second-level limit value L2 in the alarm threshold, it is obtained by adding M2 to the electromagnetic emission-based alarm reference limit value Li, i.e. L2=Li+M2, for the third-level limit value L3 in the alarm threshold, it is equivalent to use the electromagnetic sensitivity-based alarm reference limit value Ls, i.e. L3=Ls+M0.

3. An electronic device, comprising: The computer program product comprises a memory and a processor, and the memory stores a computer program; when the processor runs the computer program stored in the memory, the processor executes the alarm threshold determination method for electromagnetic environment early warning of a nuclear power plant according to claim 1.

4. A computer-readable storage medium comprising: The computer program, when running on a computer, causes the computer to execute the alarm threshold determination method for electromagnetic environment early warning of a nuclear power plant according to claim 1.

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