CN115240885A - Nuclear power station primary loop temperature measurement accuracy calibration method - Google Patents
Nuclear power station primary loop temperature measurement accuracy calibration method Download PDFInfo
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- CN115240885A CN115240885A CN202210661919.XA CN202210661919A CN115240885A CN 115240885 A CN115240885 A CN 115240885A CN 202210661919 A CN202210661919 A CN 202210661919A CN 115240885 A CN115240885 A CN 115240885A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/112—Measuring temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention belongs to the technical field of nuclear power station reactor operation and safety, and particularly relates to a method for calibrating the temperature measurement accuracy of a primary circuit of a nuclear power station. The invention comprises the following steps: step 1, determining that a loop temperature measurement system is normal; step 2, setting temperature measuring points i of cold and hot sections of each coolant loop to obtain corresponding temperature measured values T i Setting a temperature measuring point j of a coolant inlet and outlet of the fuel assembly to obtain a corresponding temperature measured value T j (ii) a Step 3, recording T in step 2 i And T j (ii) a Step 4, calculating and calibrating a reference temperature value T c (ii) a Step 5, calculating T i And T c Deviation delta i ，T j And T c Deviation delta j (ii) a Step 6, correcting the calculation value of each temperature measuring point in a calculation terminal of a loop temperature measuring system; and 7, checking the temperature measurement accuracy of the primary loop. The invention ensures the accuracy of measuring the temperature of the cold and hot sections of each coolant loop and the temperature of the coolant inlet and outlet of the fuel assembly, and can improve the operation safety and reliability of the pressurized water reactor unit.
Description
Technical Field
The invention belongs to the technical field of nuclear power plant reactor operation and safety, and particularly relates to a method for calibrating the temperature measurement accuracy of a primary circuit of a nuclear power plant.
Background
The pressurized water reactor unit needs to monitor the temperature parameters of the coolant of a primary circuit in real time, including the temperature of the cold and hot sections of each coolant loop and the temperature of the coolant inlet and outlet of a fuel assembly, so that the temperature of the primary circuit is ensured to be within a designed safety range, and the safe operation of a reactor is guaranteed. The loop temperature measuring system realizes the measurement of the temperature of the cold and hot sections of each coolant loop and the coolant inlet and outlet of the fuel assembly by transmitting the output signals of the in-situ temperature measuring elements arranged in the loop to a computing terminal for processing. When the unit is subjected to refueling and overhaul, the temperature measuring element and the fuel assembly can be moved or replaced, and the temperature measuring accuracy of a loop can be influenced by factors such as installation deviation, manufacturing difference, operation environment change, high-irradiation environment in a reactor and the like of the temperature measuring element.
Aiming at the problems, the invention provides the calibration method for the temperature measurement accuracy of the primary circuit of the nuclear power station, which ensures the measurement accuracy of the temperature of the cold and hot sections of each coolant loop and the temperature of the coolant inlet and outlet of the fuel assembly, and can improve the operation safety and reliability of the pressurized water reactor unit.
Disclosure of Invention
The invention aims to solve the technical problem that the temperature measurement accuracy of a primary circuit of a nuclear power station is influenced by factors such as installation deviation, manufacturing difference, operation environment change of the primary circuit temperature measuring element, high irradiation environment in a reactor and the like of a pressurized water reactor unit, and provides a calibration method for the temperature measurement accuracy of the primary circuit of the nuclear power station, so that the temperature measurement accuracy of cold and hot sections of each coolant loop and the temperature measurement accuracy of a coolant inlet and a coolant outlet of a fuel assembly are ensured, and the operation safety and the reliability of the pressurized water reactor unit can be improved.
The technical scheme adopted by the invention is as follows:
a nuclear power station primary circuit temperature measurement accuracy calibration method comprises the following steps:
step 1, determining that a reactor is in a thermal state zero power state, and the working state of a loop temperature measurement system and the temperature monitoring function of each area are normal;
step 2, creating temperature measuring points, setting temperature measuring points i of cold and hot sections of each coolant loop, and obtaining corresponding temperature measured values T i Setting a temperature measuring point j of a coolant inlet and outlet of the fuel assembly to obtain a corresponding temperature measured value T j Determining that the temperature parameter of a loop is in a stable state;
step 3, recording T in step 2 i And T j ；
Step 4, calculating and calibrating a reference temperature value T c ；
Step 5, calculating T i And T c Deviation delta i ，T j And T c Deviation Δ j ；
Step 6, correcting the calculation value of each temperature measuring point in a calculation terminal of a loop temperature measurement system: for T i And T j Respectively adding delta i And Δ j Correcting to ensure that the temperature measurement values of all the corrected loop temperature measurement points are at the same reference level;
and 7, checking the temperature measurement accuracy of the primary loop.
In step 1, no other operations that may cause a loop temperature change should be performed.
In the step 2, in the step of processing,
the method specifically comprises the following steps:
step 2.1, observing and recording an initial temperature value T of a certain temperature measuring point of a certain coolant loop of the primary loop at a certain time T 0 ；
Step 2.2, observing and recording the temperature measured value T of the temperature measuring point selected in the step 2.1 in the time range of T + T x ；
Step 2.3, calculating T x And T 0 Maximum deviation Δ of max ，△ max ＝MAX|T x -T 0 |，△ max The temperature of the loop during the time period is considered to be stable if the temperature of the loop should not exceed 0.5 ℃.
In the step 2.2, t' is more than or equal to 10min and less than or equal to h.
In said step 4, T c The calculating method comprises the following steps:
wherein n is the total number of the temperature measuring points i of the cold and hot sections of each coolant loop.
In the step 5, the calculation method is as follows:
△ i ＝T c -T i
△ j ＝T c -T j 。
in the step 7, the corrected measured values T 'of the cold and hot stage temperatures of the respective coolant loops are recorded' i And a fuel assembly coolant inlet-outlet temperature measurement T' j (ii) a And (3) determining that the temperature parameter of the loop is stable by adopting the method in the step (2).
Judged to be T' i And T' j Calculating an accuracy check reference temperature value T 'after stabilizing the temperature parameter' c The calculation method comprises the following steps:
calculating T' i And T' c Deviation delta' i ，T′ j And T' c Deviation delta' j The calculation method comprises the following steps:
△′ i ＝T′ c -T′ i
△′ j ＝T′ c -T′ j 。
delta 'to' i 、△′ j And determining that the temperature measurement of the loop is accurate within the range of-0.5 ℃ to +0.5 ℃, and finishing the calibration of the temperature measurement accuracy of the loop.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the method for calibrating the temperature measurement accuracy of the primary circuit of the nuclear power station can be used for calibrating the measurement accuracy of the temperature of the cold and hot sections of each coolant loop of the primary circuit and the temperature of the coolant inlet and the coolant outlet of the fuel assembly by the pressurized water reactor unit, so that the accuracy of the temperature measurement of the primary circuit in the operation stage of the pressurized water reactor unit is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for calibrating the temperature measurement accuracy of a loop of a nuclear power station, which comprises the following steps:
step 1, the reactor is in a thermal state zero power state, and whether the working state of a loop temperature measurement system and the temperature monitoring function of each area are normal or not is checked. In conducting this test, no other operations that could cause a loop temperature change should be performed.
Step 2, judging whether the temperature parameter of the loop is stable, and specifically comprising the following steps:
step 2.1, creating temperature measuring points, setting temperature measuring points i of cold and hot sections of each coolant loop, and obtaining corresponding temperature measuring values T i (ii) a Setting a temperature measuring point j of a coolant inlet and outlet of the fuel assembly to obtain a corresponding temperature measured value T j . The created temperature measuring point needs to contain all the point positions of the loop temperature measuring element;
step 2.2 observing and recording a certain coolant loop of the circuit at a certain moment tA temperature measuring point of the temperature measuring device 0 ；
Step 2.3, observing and recording the temperature measured value T of the temperature measuring point selected in the step 2.2 in the time range of T + T '(T' is more than or equal to 10min and less than or equal to h) x ；
Step 2.4, calculating T x And T 0 Maximum deviation Δ of max The calculation method comprises the following steps:
△ max ＝MAX|T x -T 0 |
in the above calculation results, Δ max The temperature of the loop during the time period is considered to be stable if the temperature of the loop should not exceed 0.5 ℃. If calculated a max If the temperature exceeds 0.5 ℃, reselecting t or t', and repeating the steps 2.2-2.4 until a time range of the temperature parameter stability of the primary loop is obtained.
And 3, recording T within the time range in which the loop temperature parameter is judged to be stable in the step 2 i And T j . Recorded T due to a stable loop temperature parameter i And T j The instantaneous value of the corresponding temperature measuring point at a certain moment in the time range can be used, and the average value in the time range can also be used.
Step 4, calculating and calibrating a reference temperature value T c The calculation method comprises the following steps:
wherein n is the total number of the temperature measuring points i of the cold and hot sections of each coolant loop.
Step 5, calculating T i And T c Deviation delta i ，T j And T c Deviation delta j The calculation method comprises the following steps:
△ i ＝T c -T i
△ j ＝T c -T j
the results of the loop temperature measurement bias calculation are shown in table 1.
TABLE 1 example table for calculating the temperature measurement deviation of a loop
Step 6, correcting the calculated values of the temperature measuring points in a calculation terminal of a loop temperature measurement system: for T i And T j Respectively add delta i And Δ j And (4) correcting, namely enabling the temperature measured values of all the corrected temperature measuring points of the loop to be at the same reference level. Delta i And Δ j And the correction value is recorded in the calculation logic of a loop temperature measurement system calculation terminal and is used for correcting the temperature measurement values of all loop temperature measurement points all the time so as to ensure the accuracy of loop temperature measurement in the unit operation stage. If the loop temperature measurement system does not have the function of calculating logic correction, T can be obtained in the unit operation stage i And T j After that, add Δ i And Δ j And correcting, wherein the corrected measured value of the temperature of the primary loop is used as the standard temperature for accuracy evaluation.
And 7, checking the temperature measurement accuracy of the primary loop. Recording the corrected measured values T 'of the temperatures of the cold and hot sections of the respective coolant loops' i And fuel assembly coolant inlet-outlet temperature measurement T' j . And (3) judging whether the recorded temperature parameter of the loop is stable or not by adopting a method of step 2. Judged to be T' i And T' j And 7.1-7.2 are executed after the temperature parameter is stabilized.
Step 7.1, calculating accuracy check reference temperature value T' c The calculation method comprises the following steps:
step 7.2, calculating T' i And T' c Deviation delta' i ，T′ j And T' c Deviation 'delta' j The calculation method comprises the following steps:
△′ i ＝T′ c -T′ i
△′ j ＝T′ c -T′ j
the results of the loop temperature accuracy calibration are shown in table 2.
Table 2 example table for calibrating the accuracy of measuring the temperature of a loop
In the above calculation result, 'Delta' i 、△′ j And if the temperature of the loop is within the range of-0.5 ℃ to +0.5 ℃, the temperature measurement of the loop is considered to be accurate, and the calibration of the temperature measurement accuracy of the loop is completed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A nuclear power station primary loop temperature measurement accuracy calibration method is characterized by comprising the following steps: the method comprises the following steps:
step (1), determining that a reactor is in a thermal state zero power state, and the working state of a loop temperature measurement system and the temperature monitoring function of each area are normal;
step (2) establishing temperature measuring points, and setting temperature measuring points of cold and hot sections of each coolant loopi, obtaining the corresponding temperature measurement value T i Setting a temperature measuring point j of a coolant inlet and outlet of the fuel assembly to obtain a corresponding temperature measured value T j Determining that the temperature parameter of a loop is in a stable state;
step (3) of recording T in step (2) i And T j ；
Step (4) calculating and calibrating a reference temperature value T c ；
Step (5), calculating T i And T c Deviation delta i ，T j And T c Deviation delta j ；
And (6) correcting the calculation value of each temperature measuring point in a calculation terminal of a loop temperature measuring system: for T i And T j Respectively adding delta i And Δ j Correcting to ensure that the temperature measurement values of all the corrected loop temperature measurement points are at the same reference level;
and (7) checking the temperature measurement accuracy of the primary loop.
2. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 1, wherein: in step (1), no other operations that may cause a loop temperature change should be performed.
3. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 1, wherein: in the step (2), the step (c),
the method specifically comprises the following steps:
step (2.1), observing and recording initial temperature value T of certain temperature measuring point of certain coolant loop of the circuit at certain time T 0 ；
Step (2.2), observing and recording the temperature measured value T of the temperature measuring point selected in the step (2.1) in the time range of T + T x ；
Step (2.3), calculating T x And T 0 Maximum deviation Δ of max ，△ max ＝MAX|T x -T 0 |，△ max Should not exceed 0.5 deg.c, the loop temperature parameter is considered stable during this time period.
4. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 3, wherein: in the step (2.2), t' is more than or equal to 10min and less than or equal to h.
5. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 1, wherein: in the step (4), T c The calculating method comprises the following steps:
wherein n is the total number of the temperature measuring points i of the cold and hot sections of each coolant loop.
6. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 1, wherein: in the step (5), the calculation method is as follows:
△ i ＝T c -T i
△ j ＝T c -T j 。
7. the method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 3, wherein: in the step (7), the corrected measured values T 'of the temperatures of the cold and hot sections of the respective coolant loops are recorded' i And fuel assembly coolant inlet-outlet temperature measurement T' j (ii) a And (3) determining that the temperature parameter of the loop is stable by adopting the method in the step (2).
8. The method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 7, wherein:
judged to be T' i And T' j After stabilization of the temperature parameters, a reference temperature value T 'for accuracy check is calculated' c The calculation method comprises the following steps:
calculating T' i And T' c Deviation 'delta' i ，T′ j And T' c Deviation delta' j The calculation method comprises the following steps:
△′ i ＝T′ c -T′ i
△′ j ＝T′ c -T′ j 。
9. the method for calibrating the temperature measurement accuracy of the primary loop of the nuclear power plant as recited in claim 8, wherein: delta 'to' i 、△′ j And within the range of-0.5 ℃ to +0.5 ℃, determining that the temperature measurement of the primary loop is accurate, and finishing the calibration of the temperature measurement accuracy of the primary loop.
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| CN117079848A (en) * | 2023-10-17 | 2023-11-17 | 四川大学 | Nuclear power plant primary loop optimal temperature measurement point selection method |
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| CN117079848A (en) * | 2023-10-17 | 2023-11-17 | 四川大学 | Nuclear power plant primary loop optimal temperature measurement point selection method |
| CN117079848B (en) * | 2023-10-17 | 2023-12-19 | 四川大学 | Nuclear power plant primary loop optimal temperature measurement point selection method |
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