A method and system for processing protection setpoint of a nuclear instrumentation system

Abstract

The present application relates to a kind of nuclear instrumentation system protection setting value processing method and system.The method is when the power of the core unit 100%FP, the low protection setting value of intermediate range is in the state of lockout, the low protection setting value corresponds to the power below 100%FP of the core unit, the method includes protection step: S11, the current value of each intermediate range channel is obtained.S12, whether the number of intermediate range channel whose current value exceeds high protection setting value meets preset condition is judged.High protection setting value corresponds to the power above 100%FP, each intermediate range channel corresponds to a high protection setting value respectively.S13, if yes, then trigger shutdown operation.The present application uses intermediate range high power protection setting value to carry out superpower shutdown protection, can effectively prevent reactor superpower risk, avoid the security risk of reactor when power range failure occurs, ensure the safety of reactor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plant reactor nuclear instrument system, and particularly relates to a nuclear instrument system protection setting value processing method and system. BACKGROUND

[0002] The pressurized water reactor nuclear instrument system (i.e. RPN system) uses a series of neutron detectors distributed outside the reactor pressure vessel to measure the reactor power, power change rate and axial power distribution, etc., and is one of the important systems directly related to the safety of the reactor. The main principle of the measurement is that the core nuclear power is positively correlated with the neutron flux rate leaked to the outside detector and the outside detector response, so the core nuclear power can be supervised through the outside detector response. When the core nuclear power increases to the protection setting value due to an accident, the over-power protection is triggered (such as triggering a protection signal when the power exceeds 9% of the rated power, and the unit is shut down).

[0003] The existing RPN design of the pressurized water reactor is divided into source range, intermediate range and power range three measurement ranges. From the aspects of instrument reliability and equipment redundancy, multiple detectors are arranged in each range. Each range covers different power measurement ranges. The measurement ranges covered by the measurement channels of the typical RPN are shown in the table. Figure 1 Generally, the power range covers the protection at high power, and usually uses an even segment detector design to supervise the nuclear power while meeting the monitoring of the axial power distribution. The intermediate range is usually used to cover the over-power protection at low power (power below 50% FP), and usually uses a single segment detector design.

[0004] When the high-power initiated accident overpowers, the protection is performed through the power range, but when the power range fails, the protection signal may fail, which may cause safety risks of the nuclear reactor. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a nuclear instrument system protection setting value processing method and system.

[0006] The technical solution adopted by the present application to solve the technical problem is: a nuclear instrument system protection setting value processing method, when the core unit is operated at a power above 100% FP, the low protection setting value of the intermediate range is in a locked state, the low protection setting value corresponds to the power of the core unit below 100% FP, and the method comprises a protection step:

[0007] S11, acquiring the current value of each intermediate range channel;

[0008] S12, judge whether the number of the intermediate range channels whose current values exceed the high protection setting value meets a preset condition, wherein the high protection setting value corresponds to a power above 100% FP, and each intermediate range channel corresponds to a high protection setting value respectively;

[0009] S13, if yes, trigger a shutdown operation.

[0010] Further, in the method for processing protection setting values of a nuclear instrument system, the method further comprises a calibration step.

[0011] S21, monitor a deviation between an intermediate range indicated power and a core thermal power when a core unit is in normal operation, wherein the intermediate range indicated power is obtained by conversion from the intermediate range current value, and the core thermal power is a transient power of the core unit;

[0012] S22, when the deviation exceeds a preset threshold, obtain a core relative thermal power of the core unit through a heat balance test, and record current values of the intermediate range channels at this time, wherein the core relative thermal power is a steady state power of the core unit;

[0013] S23, obtain protection setting values of each intermediate range channel corresponding to a target power setting value according to a relationship between the core relative thermal power and the current values of the intermediate range channels at this time.

[0014] Further, in the method for processing protection setting values of a nuclear instrument system, the step S22 comprises:

[0015] When the deviation exceeds a preset threshold, obtain a core relative thermal power of the core unit when the core unit is operated at at least one preset power through a heat balance test, and record current values of the intermediate range channels at this time, wherein when the preset power is zero power, the core relative thermal power and the current values of the corresponding intermediate range channels are both zero.

[0016] Further, in the method for processing protection setting values of a nuclear instrument system, the step S23 comprises:

[0017] According to the core relative thermal powers of at least two preset powers and the current values of the corresponding intermediate range channels, the core relative thermal power and the current values of the intermediate range channels at this time form corresponding relationships respectively, and the protection setting values of each intermediate range channel corresponding to the target power setting value are obtained by extrapolation and / or interpolation according to the relationships.

[0018] Further, in the method for processing protection setting values of a nuclear instrument system, the step S22 comprises:

[0019] When the deviation exceeds a preset threshold, the relative thermal power of the core of the core unit at full power is obtained through a thermal balance test, and the current value of each channel of the intermediate range at this time is recorded.

[0020] Further, in the processing method of the protection setting value of the nuclear instrument system, the step S23 comprises:

[0021] According to the relative thermal power of the core at full power and zero power and the corresponding current value of each channel of the intermediate range, the relative thermal power of the core and the current value of each channel of the intermediate range at this time form a linear relationship passing through zero point, and the protection setting value of each channel of the intermediate range corresponding to the target power setting value is obtained through extrapolation and / or interpolation according to the linear relationship; when the core unit is at zero power, the relative thermal power of the core and the current value of each channel of the intermediate range are both zero.

[0022] Further, in the processing method of the protection setting value of the nuclear instrument system, the core unit needs to be stably operated for a preset time before each monitoring of the core thermal power.

[0023] Further, in the processing method of the protection setting value of the nuclear instrument system, the core unit needs to be stably operated for more than 2 hours before each monitoring of the core thermal power.

[0024] Further, in the processing method of the protection setting value of the nuclear instrument system, the method further comprises the steps of:

[0025] S14, the intermediate range and the power range simultaneously monitor the power condition of the core unit at high power; when any one of the intermediate range and the power range reaches the trigger shutdown condition, the core unit is shut down.

[0026] Further, in the processing method of the protection setting value of the nuclear instrument system, the preset condition is that the number of intermediate range channels whose current value exceeds the high protection setting value is greater than a preset number; or

[0027] The ratio of the number of intermediate range channels whose current value exceeds the high protection setting value to the total number of intermediate range channels is greater than a preset ratio.

[0028] In addition, the present application also provides a pressurized water reactor nuclear instrument system, which uses the processing method of the protection setting value of the nuclear instrument system as described above.

[0029] Further, in the pressurized water reactor nuclear instrument system, the intermediate range of the pressurized water reactor nuclear instrument system selects a wide-range type detector whose power level is above 120%FP.

[0030] The nuclear instrument system protection setting value processing method and system of the present application has the following beneficial effects: the intermediate range high-power protection setting value is used to perform the super-power shutdown protection, which can effectively prevent the reactor from being in the super-power risk and avoid the safety risk of the reactor when the power range fails, thereby ensuring the safety of the reactor. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0032] Figure 1 is a schematic diagram of the measurement range covered by each range of the RPN measurement channel in the prior art;

[0033] Figure 2 is a protection step flow chart of the embodiment of the nuclear instrument system protection setting value processing method of the present application;

[0034] Figure 3 is a calibration step flow chart of the embodiment of the nuclear instrument system protection setting value processing method of the present application;

[0035] Figure 4 is a linear relationship diagram of the embodiment of the nuclear instrument system protection setting value processing method of the present application;

[0036] Figure 5 is a measured distribution diagram of the deviation of the indicated nuclear power and the core power in the intermediate range full-power indication of the xenon oscillation at the end of the service life in the embodiment of the nuclear instrument system protection setting value processing method of the present application;

[0037] Figure 6 is a measured distribution diagram of the deviation of the indicated nuclear power and the core power in the 25% FP power indication of the intermediate range in the xenon oscillation at the end of the service life in the embodiment of the nuclear instrument system protection setting value processing method of the present application;

[0038] Figure 7 is a protection step flow chart of the embodiment of the nuclear instrument system protection setting value processing method of the present application. DETAILED DESCRIPTION

[0039] In order to have a more clear understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0040] In the following description, specific details are set forth such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0041] In a preferred embodiment, with reference to Figure 2 The processing method of the nuclear instrument system protection set value of the embodiment prevents false trip of the shutdown during high-power operation, and the low protection set value corresponds to the power of the reactor core unit below 100% FP. The processing method comprises a protection step:

[0042] S11, obtaining a current value of each intermediate range channel.

[0043] S12, determining whether the number of intermediate range channels whose current value exceeds the high protection set value of the channel satisfies a preset condition. The high protection set value corresponds to the power above 100% FP, i.e., the high protection set value of the intermediate range or the high-power protection set value is the current value, which corresponds to the power above 100% FP. Specifically, each intermediate range channel corresponds to a high protection set value. It should be noted that the high protection set value corresponding to each intermediate range channel can be completely the same, completely different, or at least partially different, which is not limited herein.

[0044] Preferably, with reference to Figure 7 The preset condition includes but is not limited to that the number of intermediate range channels whose current value exceeds the high protection set value is greater than a preset number, or the ratio of the number of intermediate range channels whose current value exceeds the high protection set value to the total number of intermediate range channels is greater than a preset ratio, etc.

[0045] It should be noted that the preset number and the preset ratio can be determined according to the total number of the intermediate range channels and the actual situation of the reactor core unit, and are not limited herein. For example, in some embodiments, the total number of the intermediate range is 3, the preset condition is that the number of the intermediate range channels whose current values exceed the high protection setting value is greater than the preset number, and the preset number is 1. For example, assuming that the current values of at least two of the three intermediate range channels exceed the intermediate range channel of the high protection setting value, it can be understood that the number of the intermediate range channels whose current values exceed the high protection setting value of each channel is greater than 1, and the number of the intermediate range channels whose current values exceed the high protection setting value of each channel satisfies the preset condition. For example, in some embodiments, the total number of the intermediate range is 3, the preset condition is that the ratio of the number of the intermediate range channels whose current values exceed the high protection setting value to the total number of the intermediate range channels is greater than the preset ratio, and the preset ratio is 1 / 3. For example, assuming that the current values of at least two of the three intermediate range channels exceed the intermediate range channel of the high protection setting value, it can be understood that the ratio of the number of the intermediate range channels whose current values exceed the high protection setting value to the total number of the intermediate range channels is greater than 1 / 3, and the number of the intermediate range channels whose current values exceed the high protection setting value of each channel satisfies the preset condition.

[0046] S13, if yes, triggering the shutdown operation.

[0047] It should be noted that the high and low, such as high power and low power, high protection setting value and low protection setting value, are relative. For example, it can be below 50% FP as low power, and above 50% FP as high power, or according to specific requirements, the power protection range covered by the power range is high power, and the power outside the power range protection range is low power. The high protection setting value and the low protection setting value are the same as the high power and the low power.

[0048] The working principle of the present application is: when the reactor core unit is running at high power, the intermediate range detector monitors the current value of each channel, and judges whether the current value of each channel exceeds the corresponding high protection setting value, and if the number of channels exceeding the high protection setting value reaches a certain number, the shutdown is triggered.

[0049] The present application uses the intermediate range high power protection setting value for over-power shutdown protection, which can effectively prevent the risk of reactor over-power, avoid the safety risk of reactor when the power range fails, and ensure the safety of the reactor.

[0050] Due to the core characteristics, the change of the core nuclear power distribution under the same core nuclear power condition during operation will cause the change of the detector response, so it is necessary to regularly calibrate the conversion coefficient of the detector current-core nuclear power to ensure that the intermediate range output result can better reflect the real core nuclear power. However, due to the existing intermediate range design, when the unit is running at rated power (i.e. full power 100% FP), the intermediate range will be in a locked state, and the intermediate range cannot obtain the corresponding measured current signal, so the protection signal corresponding to the low power cannot be effectively calibrated. The low power protection setting value of the intermediate range signal (i.e. low protection setting value) cannot be calibrated during operation, resulting in that the intermediate range has great uncertainty in setting value when responding to low power protection after the unit is running at reduced power, which may cause the failure of the intermediate range low power protection.

[0051] In order to ensure that the high and low protection setting values of the intermediate range can be regularly calibrated, in the processing method of the protection setting value of the nuclear instrument system in some embodiments, the reference Figure 3 The processing method further includes a calibration step for calibrating the protection setting value of the intermediate range in the protection step to ensure the accuracy of the intermediate range protection setting value. The calibration step includes:

[0052] S21, monitor the deviation of the intermediate range indication power from the core thermal power when the core unit is normally running. The intermediate range indication power is obtained by calculating and converting the intermediate range current value, and the core thermal power is the transient power of the core unit. Preferably, the core unit needs to be stably running for a preset time before monitoring the core thermal power each time. Preferably, it is stably running for more than 2 hours, which can be 2.5 hours, 3 hours, 4 hours, etc., which is not limited here. In addition, the core thermal power is the transient power or relatively accurate core power of the core which can be obtained by some existing technical means such as heat test.

[0053] S22, when the deviation exceeds the preset threshold value, the core relative thermal power of the core unit is obtained by a heat balance test, and the current value of each channel of the intermediate range at this time is recorded. The core relative thermal power is the steady-state power of the core unit. It should be noted that the preset threshold value is set according to the specific nuclear instrument system or the specific needs of the user, which is not limited here.

[0054] S23, according to the relationship between the core relative thermal power and the current value of each channel of the intermediate range at this time, the protection setting value of each channel of the intermediate range corresponding to the target power setting value is obtained. Specifically, the target power setting value is the power corresponding to the intermediate range protection setting value, or the target power setting value is equivalent to the power calculated and converted from the intermediate range protection setting value. Each intermediate range channel corresponds to a high protection setting value, and the protection setting value of each channel needs to be calibrated respectively.

[0055] In the embodiment, on one hand, the intermediate range high power protection setting value is used for the super power trip protection, which can effectively prevent the reactor from super power risk, avoid the safety risk of the reactor when the power range fails, ensure the safety of the reactor, and on the other hand, the intermediate range protection setting value can be calibrated periodically to ensure its accuracy, and the intermediate range low power protection setting value can be calibrated well during the operation of the unit.

[0056] In the method for processing the protection setting value of the nuclear instrument system in some embodiments, step S22 comprises:

[0057] When the deviation exceeds the preset threshold, the relative thermal power of the reactor core at at least one preset power is obtained through the heat balance test, and the current value of each channel of the intermediate range at this time is recorded. When the preset power is zero power, the relative thermal power of the reactor core and the current value of each channel of the intermediate range corresponding thereto are both zero.

[0058] Preferably, step S23 comprises: according to the relative thermal power of the reactor core at at least two preset powers and the current value of each channel of the intermediate range corresponding thereto, the relative thermal power of the reactor core and the current value of each channel of the intermediate range at this time form corresponding relationships respectively, and the protection setting value of each channel of the intermediate range corresponding to the target power setting value is obtained by extrapolation and / or interpolation according to the relationships. That is, one of the two preset powers can be the relative thermal power of the reactor core at zero power of the reactor core unit without heat balance test and the current value of each channel of the intermediate range corresponding thereto. When zero power is selected, the relative thermal power of the reactor core at any one of the preset powers and the current value of each channel of the intermediate range corresponding thereto can be measured only by the heat balance test. Then, a corresponding relationship is formed between the relative thermal power of the reactor core and the current value of each channel of the intermediate range at this time through at least two preset powers. Specifically, the corresponding relationship formed between the relative thermal power of the reactor core and the current value of each channel of the intermediate range at this time can be a curve relationship, an approximate linear relationship or a linear relationship, etc. Alternatively, the reactor core unit can sample according to specific needs, and determine the relationship between the relative thermal power of the reactor core and the current value of each channel of the intermediate range corresponding thereto according to a specific number of sampling points, and determine the operation at at least one preset power, which can be 10% FP, 20% FP, 25% FP, 30% FP, 40% FP, 55% FP, 60% FP, 70% FP, 90% FP, etc.

[0059] Preferably, step S22 comprises: when the deviation exceeds the preset threshold, the relative thermal power of the reactor core at full power (100% FP) of the reactor core unit is obtained through the heat balance test, and the current value of each channel of the intermediate range at this time is recorded.

[0060] Based on the above embodiment, as shown in Figure 4 , Figure 4The linear relationship between the core relative thermal power determined by the two points of zero (i.e. zero power) and full power (100% FP) and the current values of the intermediate range channels is determined, and step S23 comprises: according to the core relative thermal power and the current values of the intermediate range channels at the two power points of zero power and full power, the core relative thermal power and the current values of the intermediate range channels at this time form a linear relationship passing through the origin, and the protection setting value of each channel of the intermediate range corresponding to the target power setting value is obtained by extrapolation and / or interpolation according to the linear relationship. It should be noted that the low protection setting value of each channel of the intermediate range is obtained by interpolation according to the corresponding linear relationship, and the high protection setting value is obtained by extrapolation according to the corresponding linear relationship.

[0061] In one specific embodiment of the calibration step, the reference Figure 4 is taken as 118% FP, and the preset threshold is taken as 1.5% FP.

[0062] In the last intermediate range neutron fluence high (high protection setting value) calibration test, the protection setting value is I 118,old n (A). During the execution of the supervision test, the reactor power is stable for more than 2 hours, the current values I now n (A) of the intermediate range channels, and the core thermal power is P 热 (% FP). The deviation value Δ (% FP) is as follows:

[0063]

[0064] The transformed power and the core thermal power deviation Δ based on the RPN intermediate range current value are monitored every day to see if they are greater than 1.5% FP; if the Δ value is greater than 1.5% FP, the KME thermal balance measurement test is performed, the core relative thermal power W (% FP) is calculated according to the thermal balance result, and the current values I n (A) of the corresponding intermediate range channels at this time are recorded; the new intermediate range neutron fluence high (high protection setting value) adjustment of channel n is extrapolated as follows:

[0065] High protection setting value n = I n multiplied by (118 / W)

[0066] Wherein, n represents the corresponding channel, such as n = 1 represents the first intermediate range channel, n = 2 represents the second intermediate range channel, and so on.

[0067] In another specific embodiment of the calibration step, the reference Figure 4 is taken as 25% FP, and the preset threshold is taken as 5% FP.

[0068] The last intermediate range neutron flux high (low protection setting) calibration test, the protection setting is I 25,old n (A). The reactor power is stable for more than 2 hours during the supervision test, and the current value I of each channel of the intermediate range is now n (A), and the thermal power is P 热 (%FP). The deviation value Δ (%FP) is as follows:

[0069]

[0070] The converted power and thermal power deviation Δ calculated based on the intermediate range current value of the RPN are monitored every day, and if the Δ value is greater than 5% FP, the KME test is performed, the relative thermal power W (%FP) of the core is calculated according to the thermal balance result, and the current value I of each channel of the intermediate range corresponding to this time is recorded n (A); the new intermediate range neutron flux high (low protection setting) adjustment of channel n is obtained by interpolation as follows:

[0071] Low protection setting n = I n multiplied by (25 / W)

[0072] Wherein, n represents the corresponding channel, such as n = 1 represents the first channel of the intermediate range, n = 2 represents the second channel of the intermediate range, and so on.

[0073] It should be noted that the calibration method of the above embodiment basically assumes that the core thermal power and the intermediate range response are linearly related. Since the core power distribution changes during operation, the change of power distribution during the two calibrations will cause the intermediate range response-core thermal power not to be strictly linearly related, so it is necessary to pay attention to whether the protection setting obtained by the above calibration method will mis-trigger the protection during operation.

[0074] To quantitatively evaluate the above problem, the present application takes a certain 177 core loading scheme as an example, and by theoretically constructing the margin of the intermediate range response from the protection setting under the operating condition, it quantitatively gives whether the operating margin of the protection setting obtained by the above calibration method is sufficient to ensure that the above high power redundant protection signal will not be mis-triggered during actual operation.

[0075] Considering the actual working condition, the transients with large changes in core power distribution during core operation include the initial calibration curve calibration test, the 85% end-of-life load tracking, and the end-of-life xenon oscillation calibration RPN coefficient test. As shown in Figure 5 , for the end-of-life xenon oscillation calibration RPN coefficient test, the maximum deviation of the intermediate range full power indication nuclear power and the core power is calculated to be 3.27%. As shown in Figure 6As shown, the maximum deviation of the intermediate range indicating nuclear power and the core power at 25% FP power is 3.78% in the xenon oscillation calibration RPN coefficient test at the end of the life. As can be seen from the figure, the change of the intermediate range current caused by the change of the core power distribution during the two calibrations does not trigger the protection setting value obtained by the above calibration method, ensuring that the unit has sufficient operating margin, that is, when the actual power is 100% FP, the maximum indicating power does not exceed 105% FP, so the protection setting value of 118% FP is not triggered, and the above calibration method is feasible.

[0076] In the embodiment, the protection setting value of the intermediate range can be periodically calibrated to ensure its accuracy, and the low-power protection setting value of the intermediate range can be well calibrated during the operation of the unit.

[0077] In the processing method of the protection setting value of the nuclear instrument system in some embodiments, the processing method further comprises the steps of:

[0078] S14, the intermediate range and the power range simultaneously monitor the power of the core unit during high-power operation. When either the intermediate range or the power range reaches the trigger shutdown condition, the core unit is shut down.

[0079] In the embodiment, the intermediate range high-power protection setting value is used for over-power shutdown protection, which can effectively avoid the safety risk of the reactor when the power range fails, and further ensure the safety of the reactor.

[0080] In another preferred embodiment, the pressurized water reactor nuclear instrument system of the embodiment uses the processing method of the protection setting value of the nuclear instrument system as described above. Preferably, the intermediate range of the pressurized water reactor nuclear instrument system selects a wide-range type detector covering a power level of 120% FP or more.

[0081] In the embodiment, the pressurized water reactor nuclear instrument system uses the intermediate range high-power protection setting value for over-power shutdown protection, which can effectively prevent the over-power risk of the reactor, avoid the safety risk of the reactor when the power range fails, ensure the safety of the reactor, periodically calibrate the protection setting value of the intermediate range to ensure its accuracy, and well calibrate the low-power protection setting value of the intermediate range during the operation of the unit.

[0082] It can be understood that the above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but cannot be understood as a limitation on the patent scope of the present application; it should be noted that for ordinary skilled persons in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A method for processing protection settings in a nuclear instrumentation system, characterized in that, When the reactor core unit is operating at power above 100% FP, the low protection setting in the intermediate range is locked. This low protection setting corresponds to the reactor core unit operating at power below 100% FP. The method includes the following protection steps: S11. Obtain the current value of each intermediate range channel; S12. Determine whether the number of intermediate range channels whose current values ​​exceed the high protection setting meets the preset conditions; wherein, the high protection setting corresponds to power above 100%FP, and each intermediate range channel corresponds to one high protection setting; S13. If so, then trigger the heap stop operation; S14. The intermediate range and the power range simultaneously monitor the power status of the core unit during high-power operation; when either the intermediate range or the power range reaches the trigger shutdown condition, the core unit shuts down. The preset condition is that the number of intermediate range channels whose current values ​​exceed the high protection setting is greater than a preset number; or The ratio of the number of intermediate range channels whose current values ​​exceed the high protection setting to the total number of intermediate range channels is greater than a preset ratio.

2. The method for processing protection settings of a nuclear instrumentation system according to claim 1, characterized in that, The method also Including calibration steps: S21. Monitor the deviation between the intermediate range indicated power and the core thermal power during normal operation of the reactor core unit; wherein, the intermediate range indicated power is calculated and converted from the intermediate range current value, and the core thermal power is the transient power of the reactor core unit. S22. When the deviation exceeds a preset threshold, the relative thermal power of the reactor core is obtained through a thermal balance test, and the current value of each channel in the intermediate range is recorded at this time; wherein, the relative thermal power of the reactor core is the steady-state power of the reactor core. S23. Based on the relationship between the relative thermal power of the reactor core and the current values ​​of each channel in the intermediate range at this time, obtain the protection setting value of each channel in the intermediate range corresponding to the target power setting value.

3. The method for processing protection settings of a nuclear instrumentation system according to claim 2, characterized in that, Step S22 includes: When the deviation exceeds a preset threshold, the relative thermal power of the reactor core is obtained by a thermal balance test when the reactor core unit is operating at at least one preset power, and the current value of each channel in the intermediate range is recorded at this time; wherein, when the preset power is zero power, the relative thermal power of the reactor core and the current value of each channel in the corresponding intermediate range are both zero.

4. The method for processing protection settings of a nuclear instrumentation system according to claim 3, characterized in that, Step S23 includes: Based on the relative thermal power of the reactor core at at least two preset power values ​​and the current values ​​of each channel in the corresponding intermediate range, a corresponding relationship is formed between the relative thermal power of the reactor core and the current values ​​of each channel in the intermediate range at this time. The protection setting value of each channel in the intermediate range corresponding to the target power setting value is obtained by extrapolation and / or interpolation based on the relationship.

5. The method for processing protection settings of a nuclear instrumentation system according to claim 3, characterized in that, Step S22 includes: When the deviation exceeds the preset threshold, the relative thermal power of the reactor core when the reactor unit is running at full power is obtained through a thermal balance test, and the current value of each channel in the intermediate range is recorded at this time.

6. The method for processing protection settings of a nuclear instrumentation system according to claim 5, characterized in that, Step S23 includes: Based on the core relative thermal power at full power and zero power and the current values ​​of each channel in the corresponding intermediate range, the core relative thermal power and the current values ​​of each channel in the intermediate range at this time form a linear relationship passing through zero. Based on the linear relationship, the protection setting value of each channel in the intermediate range corresponding to the target power setting value is obtained by extrapolation and / or interpolation. Wherein, when the core unit is at zero power, the core relative thermal power and the current values ​​of each channel in the corresponding intermediate range are both zero.

7. The method for processing protection settings of a nuclear instrumentation system according to claim 2, characterized in that, Before each monitoring of the core thermal power, it is necessary to ensure that the core unit has been operating stably for a preset period of time.

8. The method for processing protection settings of a nuclear instrumentation system according to claim 7, characterized in that, Before each monitoring of core thermal power, the core unit must be running stably for more than 2 hours.

9. A pressurized water reactor nuclear instrumentation system, characterized in that, The pressurized water reactor nuclear instrumentation system uses the nuclear instrumentation system protection setting processing method according to any one of claims 1-8.

10. The pressurized water reactor nuclear instrumentation system according to claim 9, characterized in that, The intermediate range of the pressurized water reactor instrumentation system is selected from wide-range detectors that cover power levels of 120%FP or higher.

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