Calibrating device of nuclear power unit penetration piece sealing test gas method leak detector

Abstract

The invention provides a nuclear power unit penetration piece sealing test gas method leak detector calibration device, which comprises a first plug, a detection piece and a second plug, and is characterized in that the first plug comprises a first connecting end and a second connecting end, and the first connecting end is connected with the outlet end of a gas method leak detector; the detection piece comprises a first mounting end and a second mounting end, the first mounting end is detachably connected with the second mounting end, and the detection piece is used for receiving gas at the outlet end of the gas method leak detector so as to be used for calibration of the gas method leak detector; one end of the second plug is detachably connected with the second mounting end, and the other end of the second plug is sealed or guides air. The leak rate of the positive-pressure detection gas leak detector can be realized by utilizing the detection piece, and the first plug, the detection piece and the second plug are detachably connected, so that replacement is facilitated when one part goes wrong, the cost is saved, the fault tolerance during use is improved, and the working time of workers in a radiation environment is shortened.

Description

Technical Field

[0001] This invention relates to the field of sealing test technology, specifically a calibration device for a gas leak detector for sealing tests of penetrating components of nuclear power units. Background Technology

[0002] The containment vessel of a nuclear power plant is the last line of defense for the nuclear reactor. During commissioning and overhaul, it is necessary to test the sealing performance of the containment penetrations and simulate the online operation of each system under the design baseline accident condition to assess whether the penetrations can maintain their sealing performance under accident conditions. Therefore, the accuracy of the test results is related to nuclear safety.

[0003] Currently, the calibration cycle for gas-based leak detectors in China's nuclear power industry is one year. During the sealing test of penetrating components in nuclear power units, existing equipment cannot perform on-site real-time verification of the accuracy and reliability of the equipment. Therefore, the leak detectors will encounter the following common problems in use:

[0004] 1. Due to various reasons, such as frequent long-distance transportation, incorrect operation, or failure to meet the requirements for air cleanliness, abnormal data may easily occur during the use of equipment on site. In such cases, the system is usually depressurized on site, and the damaged equipment is repaired or replaced before retesting, which delays the on-site construction period.

[0005] Second, the data obtained from the test deviated significantly from the data from previous years, and it was impossible to determine whether the deviation was caused by the test object or by a malfunction of the equipment itself. The on-site solution was to replace the instrument and conduct the test again, and then make a judgment based on the results of the test, which delayed the on-site construction period.

[0006] Furthermore, other detection methods typically include an automatic calibration step during equipment use. For example, in helium mass spectrometry leak detection, a calibration orifice is usually used to first adjust the leak detector to its optimal state and serve as the leak rate display scale for calibrating the helium leak detector, ensuring that the displayed leak rate equals the reading of the positive pressure standard orifice. Based on the same technical requirements, gas leak detectors also require on-site calibration to ensure instrument reliability and the accuracy of test data.

[0007] Based on this, the inventors of this application have designed a calibration device for a gas leak detector for nuclear power unit penetration sealing test, in order to solve the above-mentioned technical problems. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defect of the gas leak detector in the prior art that is prone to data abnormalities during use, and to provide a calibration device for the gas leak detector for nuclear power unit penetration sealing test.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution:

[0010] This invention provides a calibration device for a gas leak detector used in nuclear power unit penetration component sealing tests, characterized in that it includes:

[0011] The first plug includes a first connecting end and a second connecting end, the first connecting end being connected to the outlet end of the gas leak detector;

[0012] The detection element includes a first mounting end and a second mounting end, the first mounting end and the second connecting end being detachably connected, and the detection element is used to receive gas from the outlet end of the gas leak detector for calibration of the gas leak detector.

[0013] The second plug has one end detachably connected to the second mounting end, and the other end is sealed or vented.

[0014] According to one embodiment of the present invention, the detection element is a positive pressure standard leak hole.

[0015] According to one embodiment of the present invention, the second connecting end of the first plug and the first mounting end of the detection element are connected by a thread.

[0016] According to one embodiment of the present invention, the second mounting end of the detection element and one end of the second plug are connected by a thread.

[0017] According to one embodiment of the present invention, the first plug is a metal plug.

[0018] According to one embodiment of the present invention, one end of the second plug is a first assembly end and the other end is a second assembly end, and the first assembly end is threadedly connected to the second mounting end of the detection element;

[0019] The second assembly end is sealed or vented.

[0020] According to one embodiment of the present invention, the second assembly end is connected to the plug.

[0021] According to one embodiment of the present invention, the second assembly end is connected to the air guide tube.

[0022] According to one embodiment of the present invention, the first plug is provided with a stop member between the first connecting end and the second connecting end, the stop member being used to adjust the assembly distance between the second connecting end and the first mounting end.

[0023] According to one embodiment of the present invention, the stop is an adjusting nut, which is detachably threaded to the first plug.

[0024] The positive and progressive effects of this invention are as follows:

[0025] This invention provides a calibration device for a gas leak detector for nuclear power unit penetration sealing test, which has the following advantages:

[0026] I. In the field of nuclear power plant penetration sealing tests, we have pioneered the use of on-site instrument calibration devices. By comparing test data on-site, we can verify the reliability of the equipment, improve the accuracy of test results, reduce unnecessary test time and resource waste, and fill a gap in the industry.

[0027] Second, it effectively solves the problem that personnel cannot determine whether the measurement results are deviated due to reasons such as collisions during transportation of the gas leak detector, personnel misoperation, instrument overpressure, or flow meter exceeding the range, thus improving the rigor of the test.

[0028] Third, it effectively replaces the standard instrument in providing the quasi-leak rate during the calibration process and enables its application in nuclear power plant work sites. Its three-section connection structure makes it easy to operate and effectively reduces the radiation exposure of test personnel. Attached Figure Description

[0029] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a schematic diagram of the calibration device for the gas leak detector for nuclear power unit penetration sealing test according to the present invention;

[0031] Figure 2 This is a schematic diagram illustrating an application of one embodiment of the calibration device for the gas leak detector for nuclear power unit penetration sealing test according to the present invention.

[0032] Figure 3 This is a schematic diagram illustrating another embodiment of the calibration device for the gas leak detector for nuclear power unit penetration sealing test according to the present invention.

[0033] 10. First plug; 110. First connecting end; 120. Second connecting end; 130. Stop;

[0034] 20. Test component; 210. First mounting end; 220. Second mounting end;

[0035] 30. Second plug; 310. First assembly end; 320. Second assembly end; 330. Plug; 340. Air duct. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the invention will now be described in detail, examples of which are illustrated in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts. Furthermore, although the terminology used herein is selected from commonly known and used terminology, some terms mentioned in this specification may have been chosen by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of the description herein. Moreover, the invention should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0038] Reference Figures 1 to 3 This invention proposes a calibration device for a gas leak detector for nuclear power unit penetration sealing test, comprising a first plug 10, a detection element 20, and a second plug 30. The first plug 10 includes a first connecting end 110 and a second connecting end 120, the first connecting end 110 being connected to the outlet end of the gas leak detector. The shape of the first connecting end 110 of the first plug 10 matches the outlet end of the gas leak detector, thus facilitating quick connection with the gas leak detector and reducing the installation time between the first plug 10 and the gas leak detector.

[0039] The detection element 20 includes a first mounting end 210 and a second mounting end 220. The first mounting end 210 is detachably connected to the second connecting end 120 of the first plug 10. The detection element 20 is used to receive gas from the outlet of the gas leak detector for calibration. Currently, helium mass spectrometry leak detectors use vacuum negative pressure combined with standard leak holes to detect leak rates, and there are no instruments for positive pressure detection. Therefore, this application uses the first plug 10 as a connector to connect the detection element 20 to achieve the effect of positive pressure leak rate detection.

[0040] One end of the second plug 30 is detachably connected to the second mounting end 220 of the detection element 20, while the other end is sealed or vented. Specifically, when the other end of the second plug 30 is sealed, for example, the other end of the second plug 30 is connected to a plug 330 (such as...). Figure 3 As shown), this ensures the airtightness of the test piece 20 during storage, preventing dust from clogging the leaks and affecting the testing accuracy during long-term storage. When the other end of the second plug 30 is vented, for example, by connecting the other end of the second plug 30 to the vent tube 340 (as shown), Figure 3 (As shown), so as to adjust the gas flow rate on the tracheal side using the detection element 20.

[0041] In one embodiment, the detection element 20 may preferably be a positive pressure standard leak hole.

[0042] Currently, the flow replenishment method is the most widely used method in the sealing test of penetrations in nuclear power units. Its principle is as follows: by introducing an external medium, typically compressed gas or demineralized water, a medium at a certain pressure is injected into the penetration. When the pressure in the injection pipeline reaches equilibrium with the internal pressure of the penetration, the flow rate of the injected medium is measured using a leak detector; this flow rate is the leakage flow rate of the penetration valve.

[0043] This method requires high accuracy from the leak detector. Currently, the calibration method for the gas leak detector used by the National Institute of Metrology is to connect a high-precision calibrator to the outlet of the leak detector. However, since the standard is easily damaged and inconvenient to transport, it cannot meet the complex working conditions of the nuclear island. Therefore, the standard used by the National Institute of Metrology cannot be used for on-site calibration.

[0044] Therefore, for the penetration sealing test of nuclear power plants in their special and complex environment, the use of positive pressure standard leak detection holes can quickly and accurately calibrate the test gas leak detector in the complex field environment of the nuclear island, reduce unnecessary repeated tests caused by doubts about the accuracy of the test results, and ensure the accuracy of the containment penetration airtightness results.

[0045] In one embodiment, the first plug 10 and the detection element 20 are detachably connected by a thread (i.e., a threaded connection). This threaded detachable connection facilitates the installation or maintenance of the first plug 10 and the detection element 20, thereby reducing the time spent by personnel working and maintaining equipment at the nuclear station. Furthermore, the threaded sealing connection ensures that the medium gas leak detector directly enters the detection element 20 after the gas outlet valve leak detector, preventing additional leaks from affecting the calibration results.

[0046] In one embodiment, the first plug 10 may preferably be a metal plug.

[0047] The first plug 10 is made of metal, which helps to maintain the stability of its own leakage rate over a longer period of time, and periodically calibrates the standard leakage hole, thereby ensuring the reliability of the provided standard leakage rate.

[0048] The second plug 30 includes a first assembly end 310 and a second assembly end 320, wherein the first assembly end 310 is threadedly connected to the second mounting end 220 of the detection component 20.

[0049] The second plug 30 is detachably threaded to the detection element 20, which allows for quick installation and maintenance, and also facilitates a sealed connection, preventing gas leakage from the outlet side of the detection element 20 due to installation gaps.

[0050] Please refer to Figure 2 In one embodiment, the second assembly end 320 is connected to the plug 330. That is, when the test piece 20 is stored, it helps to ensure its sealing and prevents dust from clogging the leak holes during long-term storage.

[0051] Please refer to Figure 3 In another embodiment, the second assembly end 320 is connected to the gas guide tube 340. In this case, the gas leak detector, together with the detection elements 20 of different specifications, forms a gas control mechanism to achieve the effect of adjusting the gas flow rate in the gas guide tube 340.

[0052] In one embodiment, the first plug 10 is further provided with a stop 130 between the first connecting end 110 and the second connecting end 120. The stop 130 is used to adjust the assembly distance between the second connecting end 120 and the first mounting end 210.

[0053] The stop 130 here can preferably be an adjusting nut, which is detachably threaded to the first plug 10.

[0054] In addition, for the testing component 20, the mounting hole at the end of the testing component 20 (not shown in the figure) has an internal thread on its wall, and the depth of the mounting hole is a fixed value. Therefore, when the external thread of the first plug 10 is threadedly installed with the standard component, the stop component 130 is required to limit the length of the first plug 10 inserted into the hole.

[0055] For example, the distance between the stop 130 and the end of the second connecting end 120 is at least less than the depth of the mounting hole, thereby avoiding excessive friction between the end of the first plug 10 and the inner wall of the mounting hole of the detection element 20, which would create an assembly gap. The assembly gap would be detrimental to the sealing of the connection between the detection element 20 and the first plug 10. Thus, by setting the stop 130, the first connecting end 110 of the first plug 10 can be spaced apart from the bottom of the mounting hole to ensure the sealing of the connection between the detection element 20 and the first plug 10, thereby ensuring the detection accuracy of the detection element 20.

[0056] Based on the above structural description, the calibration operation steps of the nuclear power unit penetration component sealing test gas leak detector calibration device provided by the present invention are as follows:

[0057] 1. Connect the first connecting end 110 of the first plug 10 to the outlet end of the gas leak detector, and remove the plug 330 installed on the second mounting end 220 of the second plug 30, so that the second mounting end 220 of the detection element 20 is connected to the outside.

[0058] 2. Connect the gas leak detector to the gas source and power supply. The gas source can be a factory compressed air system or a nitrogen cylinder.

[0059] 3. Operate the gas leak detector and start pressing the test piece 20. When the pressure inside the test piece 20 reaches the calibration pressure, adjust the pressure regulating valve of the gas leak detector to stabilize the pressure within the test pressure range.

[0060] Fourth, apply leak detection liquid to the connection between the first connector 110 of the first plug 10 and the gas leak detector, as well as the connection between the first plug 10 and the detection element 20, and observe whether there are any leaks other than the standard leak holes. If there are leaks, they need to be eliminated before continuing the calibration.

[0061] 5. After the pressure stabilizes, measure the flow rate reading using a gas leak detector and compare it with the leak rate on the calibration certificate of test piece 20 to determine the effectiveness of test piece 20.

[0062] 6. If the measurement result of test piece 20 differs significantly from the standard leak rate of the calibration device, several other calibration devices with different leak rates can be selected for repeated calibration and comparison to determine whether the calibration device itself has problems such as leak blockage.

[0063] 7. If calibration problems occur, the location of the defect can be further determined by disassembling and replacing the first plug 10, the second plug 30, and the test piece 20 in sequence, which will facilitate repair and replacement.

[0064] 8. After the test is completed, stop the gas leak detector from pressing the test piece 20, disconnect the first plug 10 from the gas leak detector, release the compressed gas in the test piece 20 by pressing the first plug 10, and use the plug 330 to seal the second assembly end 320 of the second plug 30 for storage.

[0065] As described above, the nuclear power unit penetration sealing test gas leak detector calibration device of the present invention uses a first connector 110 of the first plug 10 to be matched and connected to the gas leak detector, and a second connector 120 of the first plug 10 to be connected to the detection element 20. Thus, the detection element 20 can be used to positively pressure test the leak rate of the gas leak detector. Simultaneously, a second plug 30 is used to connect to the detection element 20 for sealing or gas conduction. Sealing ensures the airtightness of the detection element 20 during storage, preventing dust from clogging the leak holes during long-term storage. Gas conduction can be used to connect to the gas conduction pipe 340, and the gas flow rate on the gas conduction pipe 340 side can be adjusted using the detection element 20. The first plug 10, the detection element 20, and the second plug 30 are detachably connected, facilitating replacement when one part malfunctions, saving costs, increasing fault tolerance during use, and reducing the working time of personnel in the radiation environment.

[0066] The calibration device for the gas leak detector used in nuclear power plant penetration sealing tests allows for on-site instrument calibration in the field of nuclear power plant penetration sealing tests. By comparing test data on-site, the device verifies equipment reliability, improves the accuracy of test results, and reduces unnecessary testing time and resource waste. Furthermore, it effectively solves the problem that personnel cannot determine whether measurement results are deviated due to factors such as transport collisions of the gas leak detector, human error, instrument overpressure, or flow meter exceeding its range, thus improving the rigor of the test. Moreover, the detachable installation method for the first plug 10, the detection element 20, and the second plug 30 effectively reduces the radiation exposure to test personnel.

[0067] In summary, the calibration device for the gas leak detector for nuclear power unit penetration sealing test of the present invention has the following advantages:

[0068] I. In the field of nuclear power plant penetration sealing test, we have pioneered the use of on-site instrument calibration devices. By comparing test data on-site, we can verify the reliability of the equipment, improve the accuracy of test results, reduce unnecessary test time and resource waste, and fill a gap in the industry.

[0069] Second, it effectively solves the problem that personnel cannot determine whether the measurement results are deviated due to reasons such as collisions during transportation of the gas leak detector, personnel misoperation, instrument overpressure, or flow meter exceeding the range, thus improving the rigor of the test.

[0070] Third, it effectively replaces the standard instrument in providing the standard leak rate during the calibration process and enables its application in nuclear power plant work sites. Its three-section connection structure makes it easy to operate and effectively reduces the radiation exposure of test personnel.

[0071] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0072] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A gas leak detector calibration device for testing the tightness of penetration parts of a nuclear power unit, characterized in that: include: A first plug, the first plug comprising a first connecting end and a second connecting end, the first connecting end being connected to an outlet end of the gas leak detector; A detection member, the detection member comprising a first mounting end and a second mounting end, the first mounting end being detachably connected to the second connecting end, the detection member being used to receive gas from an outlet end of the gas leak detector for calibration of the gas leak detector; A second plug, one end of which is detachably connected to the second mounting end, and the other end of which is sealed or air-conducting.

2. The nuclear power unit penetration piece sealing test gas leak detector calibration device according to claim 1, characterized in that: The detection member is a positive pressure standard leak.

3. The nuclear power unit penetration piece sealing test gas leak detector calibration device as claimed in claim 1, characterized in that: The second connecting end of the first plug is threadedly connected to the first mounting end of the detection member.

4. The nuclear power unit penetration piece sealing test gas leak detector calibration device according to claim 1, characterized in that: The second mounting end of the detection member is threadedly connected to one end of the second plug.

5. The gas leak detector calibration device for testing the sealing performance of nuclear power unit penetration parts according to any one of claims 1 to 4, characterized in that: The first plug is a metal plug.

6. The gas leak detector calibration device for testing the sealing performance of nuclear power unit penetration parts according to claim 4, characterized in that: One end of the second plug is a first assembly end, and the other end is a second assembly end, and the first assembly end is threadedly connected to the second mounting end of the detection member; The second assembly end is sealed or gas-conducting.

7. The gas leak detector calibration device for testing the sealing performance of nuclear power unit penetration parts according to claim 6, characterized in that: The second assembly end is connected to the plug.

8. The nuclear power unit penetration piece sealing test gas leak detector calibration device as claimed in claim 6, characterized in that: The second assembly end is connected to the air guide tube.

9. The nuclear power unit penetration piece sealing test gas leak detector calibration device according to claim 1, characterized in that: The first plug is provided with a stopper between the first connection end and the second connection end, and the stopper is used to adjust the assembly distance between the second connection end and the first installation end.

10. The nuclear power unit penetration piece sealing test gas leak detector calibration device according to claim 9, characterized in that: The stopper is an adjusting nut, and the adjusting nut is detachably connected to the first plug thread.

Images