Method for determining the results of performance tests of nuclear power plants and system therefor

Abstract

The application provides a method and system for judging the performance test results of a nuclear power station. The method comprises the following steps: S1: obtaining the flow and pump head corresponding to the known performance limit curve, and obtaining the corresponding limit curve equation constant according to the limit curve equation; S2: preprocessing the limit curve equation constant to obtain a processed correction constant, and generating a limit function in combination with each liquid level difference and its corresponding correction constant; S3: obtaining the flow and pump head under the to-be-tested liquid level difference and their uncertainties, and determining a confidence working area according to the flow and pump head and their uncertainties; and S4: obtaining a verification result according to the confidence working area and the limit function, and judging whether the test is qualified according to the verification result. The accuracy of the performance judgment of the nuclear power station and the operation safety are improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant safety operation and performance monitoring technology, and more specifically, to a method and system for determining the results of nuclear power plant performance tests. Background Technology

[0002] Nuclear power plant performance testing is a crucial means of verifying the operational status of key systems and equipment, and its results directly impact the safety and economic efficiency of the power plant. Current performance tests typically rely on direct comparison of test data with predetermined performance limit curves to determine test pass / fail. However, unavoidable reading errors exist when retrieving reference data from predetermined performance limit curves; simultaneously, actual test data itself inevitably contains measurement errors. These errors may cause test results to fall within the ambiguous region of the limit curve boundaries, thus affecting the accuracy and reliability of the judgment. Ignoring the effects of reading and measurement errors could lead to misjudgments of performance status, resulting in potential operational risks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for judging the performance test results of nuclear power plants, addressing the problems existing in the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for determining the performance test results of a nuclear power plant, comprising the following steps: Step S1: Obtain the flow rate and pump head corresponding to the known performance limit curve, and derive the corresponding limit curve equation constants based on the limit curve equation; Step S2: Preprocess the constants of the constraint curve equation to obtain the processed correction constants, and generate the constraint function based on the correction constants; Step S3: Obtain the flow rate to be measured and the pump head to be measured, as well as their uncertainties; determine the confidence working region based on the flow rate to be measured, the pump head to be measured, and the uncertainties. Step S4: Obtain the verification result based on the confidence working region and the constraint function, and determine whether the test is qualified based on the verification result.

[0005] Furthermore, the limiting curve equation constants include: the flow resistance coefficient; the limiting curve equation includes: A=(TDH-L) / Q 2 ; Where A is the flow resistance coefficient, TDH is the pump head, L is the liquid level difference, and Q is the flow rate.

[0006] Further, in step S2, the preprocessing includes: For multiple flow resistance coefficients corresponding to the same liquid level difference, sort and sample the calculations. After removing the maximum and minimum values, take the arithmetic mean of the remaining coefficients as the corrected constant.

[0007] Furthermore, the known performance limiting curves include an upper limit performance limiting curve, a lower limit performance limiting curve, a left limit performance limiting curve, and a right limit performance limiting curve, and the limiting curve equation constants include an upper limit constant, a lower limit constant, a left limit constant, and a right limit constant; In step S2, generating the restriction function based on the correction constant includes: Based on the aforementioned upper limit constant, the upper limit constraint function is obtained; Based on the lower limit constant, the lower limit constraint function is obtained; Based on the left-limit constant, the left-limit constraint function is obtained; Based on the right-bound constant, the right-bound restrictive function is obtained.

[0008] Further, the uncertainty includes flow rate uncertainty dx and pump head uncertainty dy; step S3 includes: Centered on the flow rate to be measured and the pump head to be measured, a confidence working region is determined based on the uncertainty of the flow rate and the uncertainty of the pump head. The confidence working region is a rectangular region, and the coordinates of the four vertices of the rectangular region include: the first confidence working point P1 (Q-dx, TDH+dy), the second confidence working point P2 (Q-dx, TDH-dy), the third confidence working point P3 (Q+dx, TDH+dy), and the fourth confidence working point P4 (Q+dx, TDH-dy).

[0009] Further, step S4 includes: Based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function, the first verification result of the first confidence operating point P1 relative to the performance limit qualified region is obtained; Based on the coordinates of the second confidence operating point P2 (Q-dx, TDH-dy), the lower limit constraint function, and the left limit constraint function, the second verification result of the second confidence operating point P2 relative to the performance limit qualified region is obtained; Based on the coordinates of the third confidence operating point P3 (Q+dx, TDH+dy), the upper limit constraint function, and the right limit constraint function, the third verification result of the third confidence operating point P3 relative to the performance limit qualified region is obtained; Based on the coordinates of the fourth confidence operating point P4 (Q+dx, TDH-dy), the lower limit constraint function, and the right limit constraint function, the fourth verification result of the fourth confidence operating point P4 relative to the performance limit qualified region is obtained; If the first verification result, the second verification result, the third verification result, and the fourth verification result all indicate that their corresponding confidence operating points are within the performance limit acceptable range, then the test result is deemed acceptable; if any one of the verification results indicates that its corresponding confidence operating point is outside the performance limit acceptable range, then the test result is deemed unacceptable.

[0010] Further, the step of obtaining the first verification result of the first confidence operating point P1 relative to the performance limit qualified region based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function includes: Substitute the x-coordinate (Q-dx) of the first confidence operating point P1 into the upper limit constraint function to calculate the allowable pump head upper limit value TDH_upper(P1) at this flow rate; Substitute the ordinate (TDH+dy) of the first confidence operating point P1 into the left limit constraint function to calculate the lower limit value of the allowable flow rate under the pump head, Q_left(P1). Simultaneously determine whether the first confidence operating point P1 simultaneously satisfies the following two conditions: Condition 1: The vertical coordinate value (TDH+dy) of P1 is not greater than the allowable upper limit value of pump head TDH_upper(P1), that is, TDH+dy≤TDH_upper(P1); Condition 2: The x-coordinate value (Q-dx) of P1 is not less than the lower limit of the allowable flow rate Q_left(P1), that is, Q-dx≥Q_left(P1); If both conditions one and two are met, the first verification result is that the first confidence operating point P1 is located within the performance limit acceptable area; if neither of the above conditions is met, the first verification result is that the first confidence operating point P1 is located outside the performance limit acceptable area.

[0011] Furthermore, the expression for the flow resistance coefficient includes: A=Kt / (2 g S 2 ); Where Kt is the total system resistance coefficient, which is the product of the pipe resistance coefficient K0 and the pipe length Lt, plus the orifice plate resistance coefficient K1, i.e., Kt = K0. Lt+K1; g is the velocity due to gravity; S is the cross-sectional area of ​​the pipe.

[0012] Furthermore, the flow resistance coefficient is determined by the inherent physical parameters of the circulation pipeline system; The circulating pipeline system includes a pump, connecting pipes, an orifice plate, a high-level water tank, and a low-level water pool. The pump is connected to the orifice plate through the connecting pipes. The high-level water tank and the low-level water pool form a liquid level difference through the circulating pipeline system. The orifice plate is used to generate local resistance and participates in the formation of the total resistance coefficient Kt of the system. Wherein, the liquid level difference L is the difference between the liquid level height L1 of the high-level water tank and the liquid level height L0 of the low-level water pool, that is, L=L1-L0.

[0013] This application also provides a system for determining the results of nuclear power plant performance tests, including a processor and a memory storing a computer program, wherein the processor implements the steps of any of the methods described above when executing the computer program.

[0014] The beneficial effects of this invention are that it provides a method and system for determining the performance test results of nuclear power plants. The method includes the following steps: Step S1: Obtain the flow rate and pump head corresponding to the known performance constraint curve, and derive the corresponding constraint curve equation constants according to the constraint curve equation; Step S2: Preprocess the constraint curve equation constants to obtain the processed correction constants, and generate a constraint function based on the correction constants; Step S3: Obtain the flow rate to be measured and the pump head to be measured, as well as their uncertainties, and determine the confidence working region based on the flow rate to be measured, the pump head to be measured, and the uncertainties; Step S4: Obtain the verification result based on the confidence working region and the constraint function, and determine whether the test is qualified based on the verification result. By establishing a constraint function that includes error boundaries and constructing a confidence working region by combining the uncertainty of the test data, the traditional single-point comparison is extended to a probabilistic comparison of intervals and curves, thereby achieving reliable determination of performance test results under the presence of errors, avoiding boundary misjudgment problems caused by reading errors and measurement errors, and improving the accuracy and robustness of nuclear power plant safety evaluation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a flowchart illustrating the method for determining the performance test results of a nuclear power plant according to the present invention. Figure 2 This is a schematic diagram illustrating the generation of a visual curve of the operating range based on a known performance limitation curve according to the present invention. Figure 3 This is a schematic diagram of the interface for automatically displaying and interactively selecting the distribution of historical working points in this invention. Figure 4This is a schematic diagram of the circulating pipeline system structure of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To address the problems of ambiguous boundary determination, insufficient accuracy, and unreliability caused by reading and measurement errors in existing nuclear power plant performance tests, this invention provides a method and system for determining nuclear power plant performance test results. The method is scientific and rigorous, significantly improving the robustness and reliability of test determination, and achieving accurate and objective evaluation under conditions of data uncertainty. By constructing precise constraint functions and confidence working regions and performing spatial verification, the technical challenge of misjudgment when test data is near the boundary of the performance curve is solved.

[0018] like Figure 1 As shown, in a preferred embodiment, the method for determining the performance test results of the nuclear power plant includes the following steps: Step S1: Obtain the flow rate and pump head corresponding to the known performance limit curve, and derive the limit curve equation constants corresponding to each liquid level difference based on the limit curve equation; In this step, it should be noted that the known performance limitation curves are provided by the equipment manufacturer, such as... Figure 2 As shown, the horizontal axis is Q (m³ / h) and the vertical axis is TDH (m).

[0019] Step S2: Preprocess the constants of the constraint curve equation to obtain the processed correction constants, and generate the constraint function based on the correction constants; In this step, it should be noted that, in order to solve the reading error that may be introduced by manually taking points from the drawing, the multiple sets of discrete constants (A1, A2, A3...) obtained in step S1 under a liquid level difference are preprocessed to eliminate the gross and random errors that may be generated during the manual reading of coordinate points, and more accurate and reliable constraint equation constants are obtained.

[0020] Step S3: Obtain the flow rate to be measured and the pump head to be measured, as well as their uncertainties. Determine the confidence working region based on the flow rate to be measured, the pump head to be measured, and the uncertainties. In this step, it should be noted that the single measurement point (flow rate, pump head) is expanded into a confidence region that takes into account measurement error, and its core representative point is the confidence working region.

[0021] Step S4: Obtain the verification result based on the confidence working region and the constraint function, and determine whether the test is qualified based on the verification result.

[0022] In this step, it should be noted that the flow rate or pump head parameters of the confidence working area are substituted into the constraint function to obtain the theoretical calculation value. Then, the theoretical calculation value is compared with the corresponding parameters of the measured confidence working area to calculate the deviation value. Finally, the test is judged to be qualified based on whether the deviation value meets the preset allowable error range.

[0023] This invention preprocesses known performance limitation curve data and introduces measurement uncertainty to optimize traditional boundary curves into continuous and accurate limitation functions. At the same time, it expands the measured points into confidence intervals that consider the error range. By comparing the spatial relationship between the two, the ambiguity in interpretation is eliminated at the engineering level, ensuring the accuracy of nuclear power plant performance assessment and operational safety.

[0024] Furthermore, the constants of the limiting curve equation include: the flow resistance coefficient; the limiting curve equation includes: A=(TDH-L) / Q 2 Where A is the flow resistance coefficient, TDH is the pump head, L is the liquid level difference, and Q is the flow rate.

[0025] Specifically, in this step, for multiple sets of flow rate Q and head TDH values ​​read from the drawings under the same liquid level difference, a set of flow resistance coefficients A1, A2, A3, ... are calculated based on the above equation. By preprocessing this set of coefficients (such as removing outliers, taking the average or median), the correction constant Ac under this liquid level difference is obtained.

[0026] Further, in step S2, the preprocessing includes: sorting and sampling multiple flow resistance coefficients corresponding to the same liquid level difference, removing the maximum and minimum values, and taking the arithmetic mean of the remaining coefficients as the corrected constant.

[0027] Specifically, for multiple sets of flow rates under the same liquid level difference read from the drawings He Yangcheng The values ​​are calculated based on the constraint curve equation to obtain a set of flow resistance coefficients. By preprocessing the coefficients: sorting multiple flow resistance coefficients corresponding to the same liquid level difference by numerical value, removing the maximum and minimum values, and taking the arithmetic mean of the remaining coefficients as the correction constant for that liquid level difference. The constraint function is determined based on the correction constant under different liquid level differences.

[0028] Furthermore, the known performance limiting curves include the upper limit performance limiting curve, the lower limit performance limiting curve, the left limit performance limiting curve, and the right limit performance limiting curve, and the limiting curve equation constants include the upper limit constant, the lower limit constant, the left limit constant, and the right limit constant; In step S2, generating the restrictive function based on the correction constant includes: obtaining the upper limit restrictive function based on the upper limit constant; obtaining the lower limit restrictive function based on the lower limit constant; obtaining the left limit restrictive function based on the left limit constant; and obtaining the right limit restrictive function based on the right limit constant.

[0029] Substitute the upper limit constant, lower limit constant, left limit constant, and right limit constant into the constraint curve equation A=(TDH-L) / Q. 2， We obtain the upper limit constraint function, lower limit constraint function, left limit constraint function, and right limit constraint function, respectively.

[0030] like Figure 3 As shown, further, the uncertainty includes the flow rate uncertainty dx and the pump head uncertainty dy; step S3 includes: taking the flow rate and pump head under the measured liquid level difference as the center, and determining the confidence working region based on the flow rate uncertainty and pump head uncertainty; the confidence working region is a rectangular region, and the coordinates of the four vertices of the rectangular region include the first confidence working point P1 (Q-dx, TDH+dy), the second confidence working point P2 (Q-dx, TDH-dy), the third confidence working point P3 (Q+dx, TDH+dy), and the fourth confidence working point P4 (Q+dx, TDH-dy).

[0031] Further, step S4 includes: obtaining the first verification result of the first confidence operating point P1 relative to the performance limit qualified region based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function; Based on the coordinates of the second confidence operating point P2 (Q-dx, TDH-dy), the lower limit constraint function, and the left limit constraint function, the second verification result of the second confidence operating point P2 relative to the performance limit qualified region is obtained; Based on the coordinates of the third confidence operating point P3 (Q+dx, TDH+dy), the upper limit constraint function, and the right limit constraint function, the third verification result of the third confidence operating point P3 relative to the performance limit qualified region is obtained; Based on the coordinates of the fourth confidence operating point P4 (Q+dx, TDH-dy), the lower limit constraint function, and the right limit constraint function, the fourth verification result of the fourth confidence operating point P4 relative to the performance limit qualified region is obtained; If the first, second, third, and fourth verification results all indicate that their corresponding confidence operating points are within the performance limit acceptable range, the test result is deemed acceptable; if any one of the verification results indicates that its corresponding confidence operating point is outside the performance limit acceptable range, the test result is deemed unacceptable.

[0032] Furthermore, based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function, the first verification result of the first confidence operating point P1 relative to the performance limit qualified region is as follows: Substitute the x-coordinate (Q-dx) of the first confidence operating point P1 into the upper limit constraint function to calculate the allowable upper limit value of pump head TDH_upper(P1) at this flow rate; Substitute the ordinate (TDH+dy) of the first confidence operating point P1 into the left limit constraint function to calculate the lower limit of the allowable flow rate Q_left(P1) under the pump head; Simultaneously determine whether the first confidence operating point P1 satisfies the following two conditions: Condition 1: The vertical axis value (TDH+dy) of P1 is not greater than the upper limit of the allowable pump head TDH_upper(P1), that is, TDH+dy≤TDH_upper(P1); Condition 2: The x-coordinate value (Q-dx) of P1 is not less than the lower limit of the allowable flow rate Q_left(P1), that is, Q-dx≥Q_left(P1); If both conditions one and two are met, the first verification result is that the first confidence operating point P1 is located within the performance limit acceptable area; if neither of the above conditions is met, the first verification result is that the point is located outside the performance limit acceptable area.

[0033] For the qualification judgment of the second confidence operating point P2 (Q-dx, TDH-dy): Substituting the x-coordinate (Q-dx) of the second confidence operating point P2 into the lower limit constraint function, the allowable pump head lower limit value TDH_lower(P2) at this flow rate is calculated; Substituting the ordinate (TDH-dy) of the second confidence operating point P2 into the left limit constraint function, the lower limit of the allowable flow rate under the pump head is calculated as Q_left(P2); Simultaneously determine whether the second confidence operating point P2 simultaneously satisfies the following two conditions: Condition 1: The ordinate value of P2 (TDH-dy) is not less than the lower limit of the allowable pump head TDH_lower(P2), that is, TDH-dy ≥ TDH_lower(P2); Condition 2: The x-coordinate value (Q-dx) of P2 is not less than the lower limit of the allowable flow rate Q_left(P2), that is, Q-dx ≥ Q_left(P2); If both conditions one and two above are met, the second verification result is that the point is located within the performance limit acceptable area; if neither of the above conditions is met, the second verification result is that the point is located outside the performance limit acceptable area.

[0034] For the qualification judgment of the third confidence operating point P3(Q+dx, TDH+dy): Substituting the x-coordinate (Q+dx) of the third confidence operating point P3 into the upper limit constraint function, the allowable upper limit value of pump head TDH_upper(P3) under this flow rate is calculated; Substituting the ordinate (TDH+dy) of the third confidence operating point P3 into the right limit constraint function, the upper limit of the allowable flow rate under the pump head is calculated as Q_right(P3); Simultaneously determine whether the third confidence operating point P3 simultaneously satisfies the following two conditions: Condition 1: The ordinate value of P3 (TDH+dy) is not greater than the upper limit of the allowable pump head TDH_upper(P3), that is, TDH+dy ≤ TDH_upper(P3); Condition 2: The x-coordinate value (Q+dx) of P3 is not greater than the allowable flow limit value Q_right(P3), that is, Q+dx ≤ Q_right(P3); If both conditions one and two above are met, the third verification result is that the point is located within the performance limit acceptable area; if neither of the above conditions is met, the third verification result is that the point is located outside the performance limit acceptable area.

[0035] For the qualification judgment of the fourth confidence operating point P4(Q+dx, TDH-dy): Substituting the x-coordinate (Q+dx) of the fourth confidence operating point P4 into the lower limit constraint function, the allowable pump head lower limit value TDH_lower(P4) under this flow rate is calculated; Substituting the ordinate (TDH-dy) of the fourth confidence operating point P4 into the right limit constraint function, the upper limit of the allowable flow rate under the pump head is calculated as Q_right(P4); Simultaneously determine whether the fourth confidence operating point P4 simultaneously satisfies the following two conditions: Condition 1: The ordinate value of P4 (TDH-dy) is not less than the allowable lower limit of pump head TDH_lower(P4), that is, TDH-dy ≥ TDH_lower(P4); Condition 2: The x-coordinate value (Q+dx) of P4 is not greater than the allowable flow limit value Q_right(P4), that is, Q+dx ≤ Q_right(P4); If both conditions one and two above are met, the fourth verification result is that the point is located within the performance limit acceptable area; if neither of the above conditions is met, the fourth verification result is that the point is located outside the performance limit acceptable area.

[0036] Furthermore, the expression for the flow resistance coefficient includes: A = Kt / (2 g S 2 Where Kt is the total system resistance coefficient, which is the product of the pipe resistance coefficient K0 and the pipe length Lt, plus the orifice resistance coefficient K1, i.e., Kt = K0. Lt+K1; g is the velocity due to gravity; S is the cross-sectional area of ​​the pipe.

[0037] Furthermore, the flow resistance coefficient is determined by the inherent physical parameters of the circulation pipeline system. The circulation pipeline system includes a pump, connecting pipes, an orifice plate, an elevated water tank, and a low-level water pool. The pump is connected to the orifice plate through the connecting pipes. The elevated water tank and the low-level water pool form a liquid level difference through the circulation pipeline system. The orifice plate is used to generate local resistance and participates in the formation of the total system resistance coefficient Kt. The liquid level difference L is the difference between the liquid level height L1 of the elevated water tank and the liquid level height L0 of the low-level water pool, i.e., L = L1 - L0.

[0038] Specifically, such as Figure 4 As shown, further, the flow resistance coefficient is determined by the inherent physical parameters of the circulation pipeline system. The circulation pipeline system includes a pump 3, connecting pipe 5, orifice plate 4, high-level water tank 2, and low-level water pool 1. The pump 3 is connected to the orifice plate 4 via the connecting pipe 5. The high-level water tank 2 and the low-level water pool 1 form a level difference 6 through the circulation pipeline system. The orifice plate generates local resistance and participates in the overall system resistance coefficient Kt. The level difference L is the difference between the high-level water tank level L1 and the low-level water pool level L0, i.e., L = L1 - L0, and TDH = P_outlet - P_inlet / g / ρ. P_outlet refers to the pressure measured at the pump outlet flange. P_inlet refers to the pressure measured at the pump inlet flange.

[0039] This application also provides a system for determining the results of nuclear power plant performance tests, including a processor and a memory storing a computer program, wherein the processor implements the steps of any of the above methods when executing the computer program.

[0040] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for determining the results of a nuclear power plant performance test, characterized in that, Includes the following steps: Step S1: Obtain the flow rate and pump head corresponding to the known performance limit curve, and derive the corresponding limit curve equation constants based on the limit curve equation; Step S2: Preprocess the constants of the constraint curve equation to obtain the processed correction constants, and generate the constraint function based on the correction constants; Step S3: Obtain the flow rate to be measured and the pump head to be measured, as well as their uncertainties; determine the confidence working region based on the flow rate to be measured, the pump head to be measured, and the uncertainties. Step S4: Obtain the verification result based on the confidence working region and the constraint function, and determine whether the test is qualified based on the verification result.

2. The method for determining the performance test results of a nuclear power plant according to claim 1, characterized in that, The limiting curve equation constants include: the flow resistance coefficient; the limiting curve equation includes: A=(TDH-L) / Q 2 ; Where A is the flow resistance coefficient, TDH is the pump head, L is the liquid level difference, and Q is the flow rate.

3. The method for determining the performance test results of a nuclear power plant according to claim 2, characterized in that, In step S2, the preprocessing includes: For multiple flow resistance coefficients corresponding to the same liquid level difference, sort and sample the calculations. After removing the maximum and minimum values, take the arithmetic mean of the remaining coefficients as the corrected constant.

4. The method for determining the performance test results of a nuclear power plant according to claim 1, characterized in that, The known performance limit curves include an upper limit performance limit curve, a lower limit performance limit curve, a left limit performance limit curve, and a right limit performance limit curve, and the constants of the limit curve equations include an upper limit constant, a lower limit constant, a left limit constant, and a right limit constant; In step S2, generating the restriction function based on the correction constant includes: Based on the aforementioned upper limit constant, the upper limit constraint function is obtained; Based on the lower limit constant, the lower limit constraint function is obtained; Based on the left-limit constant, the left-limit constraint function is obtained; Based on the right-bound constant, the right-bound restrictive function is obtained.

5. The method for determining the performance test results of a nuclear power plant according to claim 4, characterized in that, The uncertainty includes flow rate uncertainty dx and pump head uncertainty dy; step S3 includes: Centered on the flow rate to be measured and the pump head to be measured, a confidence working region is determined based on the uncertainty of the flow rate and the uncertainty of the pump head. The confidence working region is a rectangular region, and the coordinates of the four vertices of the rectangular region include: the first confidence working point P1 (Q-dx, TDH+dy), the second confidence working point P2 (Q-dx, TDH-dy), the third confidence working point P3 (Q+dx, TDH+dy), and the fourth confidence working point P4 (Q+dx, TDH-dy).

6. The method for determining the performance test results of a nuclear power plant according to claim 5, characterized in that, Step S4 includes: Based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function, the first verification result of the first confidence operating point P1 relative to the performance limit qualified region is obtained; Based on the coordinates of the second confidence operating point P2 (Q-dx, TDH-dy), the lower limit constraint function, and the left limit constraint function, the second verification result of the second confidence operating point P2 relative to the performance limit qualified region is obtained; Based on the coordinates of the third confidence operating point P3 (Q+dx, TDH+dy), the upper limit constraint function, and the right limit constraint function, the third verification result of the third confidence operating point P3 relative to the performance limit qualified region is obtained; Based on the coordinates of the fourth confidence operating point P4 (Q+dx, TDH-dy), the lower limit constraint function, and the right limit constraint function, the fourth verification result of the fourth confidence operating point P4 relative to the performance limit qualified region is obtained; If the first verification result, the second verification result, the third verification result, and the fourth verification result all indicate that their corresponding confidence operating points are within the performance limit acceptable range, then the test result is deemed acceptable; if any one of the verification results indicates that its corresponding confidence operating point is outside the performance limit acceptable range, then the test result is deemed unacceptable.

7. The method for determining the performance test results of a nuclear power plant according to claim 6, characterized in that, The step of obtaining the first verification result of the first confidence operating point P1 relative to the performance limit qualified region based on the coordinates of the first confidence operating point P1 (Q-dx, TDH+dy), the upper limit constraint function, and the left limit constraint function includes: Substitute the x-coordinate (Q-dx) of the first confidence operating point P1 into the upper limit constraint function to calculate the allowable pump head upper limit value TDH_upper(P1) at this flow rate; Substitute the ordinate (TDH+dy) of the first confidence operating point P1 into the left limit constraint function to calculate the lower limit value of the allowable flow rate under the pump head, Q_left(P1). Simultaneously determine whether the first confidence operating point P1 simultaneously satisfies the following two conditions: Condition 1: The vertical coordinate value (TDH+dy) of P1 is not greater than the allowable upper limit value of pump head TDH_upper(P1), that is, TDH+dy≤TDH_upper(P1); Condition 2: The x-coordinate value (Q-dx) of P1 is not less than the lower limit of the allowable flow rate Q_left(P1), that is, Q-dx≥Q_left(P1); If both conditions one and two are met, the first verification result is that the first confidence operating point P1 is located within the performance limit acceptable area; if neither of the above conditions is met, the first verification result is that the first confidence operating point P1 is located outside the performance limit acceptable area.

8. The method for determining the performance test results of a nuclear power plant according to claim 2, characterized in that, The expression for the flow resistance coefficient includes: A=Kt / (2 g S 2 ); Where Kt is the total system resistance coefficient, which is the product of the pipe resistance coefficient K0 and the pipe length Lt, plus the orifice plate resistance coefficient K1, i.e., Kt = K0. Lt+K1; g is the velocity due to gravity; S is the cross-sectional area of ​​the pipe.

9. The method for determining the performance test results of a nuclear power plant according to claim 8, characterized in that, The flow resistance coefficient is determined by the inherent physical parameters of the circulation pipeline system; The circulating pipeline system includes a pump, connecting pipes, an orifice plate, a high-level water tank, and a low-level water pool. The pump is connected to the orifice plate through the connecting pipes. The high-level water tank and the low-level water pool form a liquid level difference through the circulating pipeline system. The orifice plate is used to generate local resistance and participates in the formation of the total resistance coefficient of the system. Wherein, the liquid level difference L is the difference between the liquid level height L1 of the high-level water tank and the liquid level height L0 of the low-level water pool, that is, L=L1-L0.

10. A system for determining the performance test results of a nuclear power plant, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 9.

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