Containment boundary cable hole plugging and leakage detecting method

Abstract

The invention particularly relates to a containment boundary cable hole plugging and leakage detecting method. The method comprises the steps that a test piece is manufactured; measuring and fitting net sound intensity values and leakage rates of leakage points with different apertures on the hole plugging surface of the test piece to obtain a relation curve of the net sound intensity values and the leakage rates of the leakage points; measuring the net sound intensity value of each leakage point of the containment boundary cable hole plugging surface, and calculating the net sound intensity value and leakage rate of each leakage point of the containment boundary cable hole plugging surface in combination with the net sound intensity value and leakage rate relation curve of the leakage point; determining a final leakage rate value of each leakage point of the containment boundary cable hole plugging surface; and adding the final values of the leakage rates of the leakage points of the containment boundary cable hole plugging surface to obtain the leakage rate of the containment boundary cable hole plugging surface. According to the containment boundary cable hole plugging leakage detection method, accurate measurement of the sound intensity value of containment boundary cable hole plugging and semi-quantitative leakage rate detection of containment boundary cable hole plugging are realized.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant performance testing, in particular to a method for plugging and leak detection of cable holes at the boundary of a containment vessel. Background Art

[0002] The sodium-cooled fast reactor uses a low-pressure, steel-lined containment. The cables running through the containment boundary are plugged, and there are 175 cable holes in the containment boundary. The plugging of cable holes has an impact on the overall leakage rate of the containment, and attention should be paid to ensure that its sealing meets the requirements.

[0003] At present, the ultrasonic method is used to detect leaks in containment cable holes. The test sound intensity value of the test hole is compared with the benchmark sound intensity value to intuitively reflect the leakage of the test hole. The main steps are: measuring and recording the benchmark sound intensity value of the test hole; measuring and recording the test sound intensity value of the test hole; comparing the test sound intensity value of the test hole with the benchmark sound intensity value to roughly evaluate the leakage of the test hole.

[0004] The existing containment cable hole plugging and leak detection method has the following problems: due to the unstable interference of the on-site environment, the benchmark sound intensity value of the test hole is difficult to record accurately; the leakage rate and sound intensity value of the test hole are not linked, and the leakage situation of the test hole is only intuitively reflected by comparing the test sound intensity value of the test hole with the benchmark sound intensity value, and a mature semi-quantitative detection method has not been formed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for sealing and detecting leaks in cable holes at the boundary of a containment shell, so as to solve the above-mentioned problems existing in the existing method for sealing and detecting leaks in cable holes at the boundary of a containment shell, realize accurate measurement of the sound intensity value of the sealing of cable holes at the boundary of a containment shell, and establish a relationship curve between the leakage rate and the net sound intensity value of the sealing of cable holes at the boundary of a containment shell, so as to realize semi-quantitative leakage rate detection of the sealing of cable holes at the boundary of a containment shell, and ensure the sealing of the sealing of cable holes at the boundary of a containment shell.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for plugging and leak detection of cable holes at the boundary of a containment vessel comprises the following steps:

[0008] Make test pieces for plugging cable holes at the containment boundary;

[0009] Measure the net sound intensity and leakage rate of leakage points with different hole diameters on the hole sealing surface of the test piece;

[0010] With the net sound intensity value of the leakage point as the horizontal coordinate and the leakage rate of the leakage point as the vertical coordinate, the net sound intensity value and leakage rate of the leakage points with different apertures on the hole plugging surface of the test piece are fitted to obtain the relationship curve between the net sound intensity value of the leakage point and the leakage rate;

[0011] Measure the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment, and calculate the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment by combining the relationship curve between the net sound intensity value of the leakage point and the leakage rate;

[0012] According to the net sound intensity value and leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment is determined;

[0013] According to the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the leakage rate of the sealing surface of the cable hole at the boundary of the containment is calculated.

[0014] As one of the feasible ways, a test piece for sealing cable holes at the boundary of the containment is manufactured according to the size of the cable holes at the boundary of the containment and the amount of silicone rubber for sealing the cable holes at the boundary of the containment; the test piece for sealing cable holes at the boundary of the containment is a closed box, which includes a first box, a second box and a blind plate with a nozzle; the first box is a cylindrical structure with openings at both ends, and several steel pipes with different apertures are horizontally arranged inside and silicone rubber is poured to form a sealing surface for leakage holes with different aperture leakage points, which is used to simulate the sealing surface of cable holes with different aperture leakage points at the boundary of the containment; the second box is a cylindrical structure with openings at both ends, and the right port is sealedly connected to the left port of the first box, and the left port is sealedly connected to the blind plate with a nozzle to form a pressurized space; the test piece for sealing cable holes at the boundary of the containment is leak-free as a whole.

[0015] As one of the feasible methods, the net sound intensity value and leakage rate of each leakage point on the sealing surface of the leaking hole of the test piece are measured, including the following steps:

[0016] Before the left port of the second box is sealed and connected to the blind plate with the nozzle, the ultrasonic sound source tape is fixed inside the second box, and the emission port of the ultrasonic sound source faces the first box;

[0017] Seal and connect the left port of the second box to the blind plate with a nozzle;

[0018] Glue sound insulation cotton to the outside of the second box;

[0019] The net sound intensity and leakage rate of leakage points with different apertures on the hole sealing surface of the test piece were measured respectively.

[0020] As one of the feasible methods, the net sound intensity value and leakage rate of a single leakage point on the sealing surface of the leaking hole of the test piece are measured, including the following steps:

[0021] Through the local leak detector, the test pressure is filled into the pressurized space of the test piece and the pressure is maintained. The test pressure is consistent with the pressure inside the containment.

[0022] Open a single leak point on the hole sealing surface of the test piece, use a local leak detector to measure the leakage rate of the single leak point on the hole sealing surface of the test piece by the flow supplement method, and when the display value of the local leak detector is stable, use the display value of the local leak detector at this time as the leakage rate of the single leak point on the hole sealing surface of the test piece and record it;

[0023] Turn off the local leak detector and depressurize the test piece;

[0024] After the test piece is depressurized, use an ultrasonic leak detector to measure the baseline sound intensity value and test sound intensity value of a single leakage point on the hole sealing surface of the test piece and record them;

[0025] Substitute the reference sound intensity value and test sound intensity value of a single leakage point on the hole sealing surface of the test piece into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of a single leakage point on the leakage hole sealing surface of the test piece and record it.

[0026] As one of the feasible methods, an ultrasonic leak detector is used to measure and record the reference sound intensity value and the test sound intensity value of a single leakage point on the hole sealing surface of the test piece, including the following steps:

[0027] The probe of the ultrasonic leak detector scans the environment around a single leak point on the hole plugging surface of the test piece. When there is no sound around the single leak point on the hole plugging surface of the test piece and the ultrasonic leak detector displays the minimum value, the sound intensity value displayed by the ultrasonic leak detector at this time is used as the reference sound intensity value of the single leak point on the hole plugging surface of the test piece and recorded;

[0028] The probe of the ultrasonic leak detector scans a single leakage point on the hole sealing surface of the test piece, and the sound intensity value displayed by the ultrasonic leak detector at this time is used as the test sound intensity value of the single leakage point on the hole sealing surface of the test piece and recorded.

[0029] As one of the feasible methods, the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment is measured, and the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment is calculated by combining the relationship curve between the net sound intensity value of the leakage point and the leakage rate, including the following steps:

[0030] Find out the leakage points on the sealing surface of the cable holes at the boundary of the containment;

[0031] Measure the reference sound intensity value and test sound intensity value of each leakage point on the sealing surface of the cable hole at the containment boundary;

[0032] Substitute the reference sound intensity value and the test sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment;

[0033] Substitute the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the relationship curve between the net sound intensity value of the leakage point and the leakage rate to obtain the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment.

[0034] As one of the feasible methods, finding a single leakage point on the sealing surface of the cable hole at the containment boundary includes the following steps:

[0035] The probe of the ultrasonic leak detector scans along the sealing surface of the cable hole at the boundary of the containment, and with the earphone of the ultrasonic leak detector, the place where the sound is continuously detected within the specified range of the sealing surface of the cable hole at the boundary of the containment and no sound is detected around the specified range is marked as a single leakage point of the sealing surface of the cable hole at the boundary of the containment;

[0036] The probe of the ultrasonic leak detector scans the single leakage point on the sealing surface of the cable hole at the boundary of the containment shell. In conjunction with the earphone of the ultrasonic leak detector, the point with the loudest sound and the largest display value of the ultrasonic leak detector is marked as the single leakage point on the sealing surface of the cable hole at the boundary of the containment shell.

[0037] As one of the feasible methods, the reference sound intensity value and the test sound intensity value of a single leakage point on the sealing surface of the cable hole at the containment boundary are measured, including the following steps:

[0038] The probe of the ultrasonic leak detector scans the environment around a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and when there is no sound around the single leakage point on the sealing surface of the cable hole at the boundary of the containment and the ultrasonic leak detector displays the minimum value, the sound intensity value displayed by the ultrasonic leak detector at this time is used as the reference sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and recorded;

[0039] The probe of the ultrasonic leak detector scans a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and the sound intensity value displayed by the ultrasonic leak detector at this time is used as the test sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and recorded.

[0040] As one of the feasible methods, according to the net sound intensity value and leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is determined, including the following steps:

[0041] When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is less than -27, the final value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment is determined to be 0;

[0042] When -27≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 500mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 500mL / min;

[0043] When -9≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -1, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is (500-1000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1000 mL / min;

[0044] When -1≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 3, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1000-1500) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1500 mL / min;

[0045] When 3≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1500-2000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 2000 mL / min;

[0046] When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is ≥9, it is determined that the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is greater than 2L / min.

[0047] As one of the feasible ways, the final values ​​of the leakage rates of various leakage points on the sealing surface of the cable hole at the boundary of the containment are added together to obtain the leakage rate of the sealing surface of the cable hole at the boundary of the containment.

[0048] Beneficial technical effects of the present invention:

[0049] The present invention provides a method for sealing and detecting leaks in cable holes at the boundary of a containment vessel. A test piece for sealing cable holes at the boundary of a containment vessel is manufactured, and the net sound intensity value and the leakage rate of each leakage point on the sealing surface of the leakage hole of the test piece are measured in a laboratory, thereby avoiding the problem that it is difficult to accurately record the reference sound intensity value due to interference factors in the field test environment. The net sound intensity value and the leakage rate of each leakage point on the sealing surface of the leakage hole of the test piece are fitted to obtain a relationship curve between the net sound intensity value and the leakage rate of the leakage point, so as to guide the measurement of the leakage rate of the sealing surface of the cable hole at the boundary of the containment vessel, realize the semi-quantitative measurement of the leakage rate of the sealing surface of the cable hole at the boundary of the containment vessel, and ensure the sealing of the sealing of the cable hole at the boundary of the containment vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1It is a schematic diagram of the test piece structure;

[0051] Figure 2 This is a schematic diagram of the leakage rate measurement of the leakage point on the sealing surface of the leaking hole of the test piece;

[0052] Figure 3 This is a schematic diagram of the test sound intensity value measurement at the leakage point of the sealing surface of the leakage hole of the test piece;

[0053] Figure 4 A schematic diagram of various leakage points on the sealing surface of the cable hole at the boundary of the containment shell according to an embodiment.

[0054] In the figure, 1. test piece; 11. first box; 12. second box; 13. blind plate; 2. ultrasonic sound source; 3. ultrasonic leak detector; 4. local leak detector. DETAILED DESCRIPTION

[0055] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "left end", "right end", "above", "below", "outside", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] See also Figure 1-4 This embodiment provides a method for plugging and leak detection of cable holes at the boundary of a containment vessel, comprising the following steps:

[0059] Make a test piece 1 for plugging the cable hole at the containment boundary;

[0060] Measure the net sound intensity and leakage rate of leakage points with different hole diameters on the hole sealing surface of test piece 1;

[0061] With the net sound intensity value of the leakage point as the horizontal coordinate and the leakage rate of the leakage point as the vertical coordinate, the net sound intensity value and leakage rate of the leakage points with different apertures on the hole plugging surface of the test piece 1 are fitted to obtain the relationship curve between the net sound intensity value and leakage rate of the leakage points with different apertures;

[0062] Measure the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment, and calculate the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment by combining the relationship curve between the net sound intensity value of the leakage point and the leakage rate;

[0063] According to the net sound intensity value and leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment is determined;

[0064] According to the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the leakage rate of the sealing surface of the cable hole at the boundary of the containment is calculated.

[0065] In the present embodiment, as one of the feasible ways, according to the size of the cable hole at the boundary of the containment and the amount of silicone rubber for sealing the cable hole at the boundary of the containment, a test piece 1 for sealing the cable hole at the boundary of the containment is manufactured; the test piece 1 for sealing the cable hole at the boundary of the containment is a closed box, which includes a first box 11, a second box 12 and a blind plate 13 with a nozzle; the first box 11 is a cylindrical structure with openings at both ends, and several steel pipes with different apertures are arranged horizontally inside and silicone rubber is poured to form a hole sealing surface with leakage points of different apertures, which is used to simulate the sealing surface of cable holes with different apertures at the boundary of the containment; the second box 12 is a cylindrical structure with openings at both ends, the right port is sealedly connected to the left port of the first box 11, and the left port is sealedly connected to the blind plate 13 with a nozzle to form a pressurized space; the test piece 1 for sealing the cable hole at the boundary of the containment is leak-free as a whole.

[0066] In this embodiment, as one of the feasible methods, a steel pipe horizontally arranged inside the first box body 11 is used as a leakage point to simulate the leakage point of the cable hole sealing surface at the boundary of the containment shell; silicone rubber is poured inside the first box body 11 where the steel pipe is horizontally arranged as a leakage hole sealing surface to simulate the cable hole sealing surface at the boundary of the containment shell; the right port of the second box body 12 is connected to the left port of the first box body 11 using sealant to ensure that there is no leakage at the connection between the first box body 11 and the second box body 12; the blind plate 13 is connected to the second box body 12 using sealant to ensure that there is no leakage at the connection between the blind plate 13 and the second box body 12; the closed box body is made of acrylic material.

[0067] In this embodiment, as one of the achievable methods, measuring the net sound intensity value and leakage rate of leakage points with different apertures on the hole sealing surface of the test piece 1 includes the following steps:

[0068] Before the left port of the second box 12 is sealed and connected to the blind plate 13 with a nozzle, the ultrasonic sound source 2 is fixed inside the second box 12 with adhesive tape, and the emission port of the ultrasonic sound source 2 faces the first box 11;

[0069] The left port of the second box 12 is sealedly connected to the blind plate 13 with a nozzle;

[0070] Glue sound insulation cotton to the outside of the second box body 12;

[0071] The net sound intensity and leakage rate of leakage points with different apertures on the hole sealing surface of the test piece were measured respectively.

[0072] In this embodiment, as one of the achievable methods, measuring the net sound intensity value and leakage rate of a single leakage point on the hole sealing surface of the test piece 1 includes the following steps:

[0073] The test pressure is filled into the pressurized space of the test piece 1 through the local leak detector 4 and the pressure is maintained. The test pressure is consistent with the pressure in the containment.

[0074] Open a single leak point on the hole plugging surface of the test piece 1, use the local leak detector 4 to measure the leakage rate of the single leak point on the hole plugging surface of the test piece 1 by the flow supplement method, and when the display value of the local leak detector 4 is stable, the display value of the local leak detector 4 at this time is used as the leakage rate of the single leak point on the hole plugging surface of the test piece 1 and recorded;

[0075] Turn off the local leak detector 4 and relieve the pressure on the test piece 1;

[0076] After the pressure relief of the test piece 1 is completed, the reference sound intensity value and the test sound intensity value of a single leakage point on the hole plugging surface of the test piece 1 are measured and recorded using the ultrasonic leak detector 3;

[0077] Substitute the reference sound intensity value and test sound intensity value of a single leakage point on the hole sealing surface of test piece 1 into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of a single leakage point on the hole sealing surface of test piece 1 and record it.

[0078] In this embodiment, as one of the achievable methods, an ultrasonic leak detector 3 is used to measure and record the reference sound intensity value and the test sound intensity value of a single leakage point on the hole sealing surface of the test piece 1, including the following steps:

[0079] The probe of the ultrasonic leak detector 3 scans the surrounding environment of a single leakage point on the hole plugging surface of the test piece 1. With the earphone of the ultrasonic leak detector 3, when there is no sound in the surrounding environment of the single leakage point on the hole plugging surface of the test piece 1 and the display value of the ultrasonic leak detector 3 is the minimum, the sound intensity value displayed by the ultrasonic leak detector 3 at this time is used as the reference sound intensity value of the single leakage point on the hole plugging surface of the test piece 1 and recorded;

[0080] The probe of the ultrasonic leak detector 3 scans a single leakage point on the hole sealing surface of the test piece 1, and the sound intensity value displayed by the ultrasonic leak detector 3 at this time is used as the test sound intensity value of the single leakage point on the hole sealing surface of the test piece 1 and recorded.

[0081] In this embodiment, as one of the achievable methods, the test pressure filled into the pressurized space of the test piece 1 is 5 kPa.g.

[0082] In this embodiment, as one of the achievable methods, the leakage rate L of each leakage point on the hole sealing surface of the test piece 1 is 测量 , Test sound intensity value I j , reference sound intensity value I o and net sound intensity value I k As shown in Table 1.

[0083] Table 1 Leakage rate and sound intensity values ​​of different hole diameter leakage points on the hole sealing surface of test piece 1

[0084]

[0085] In this embodiment, as one of the achievable methods, the net sound intensity value of the leakage point is taken as the horizontal coordinate, and the leakage rate of the leakage point is taken as the vertical coordinate. The net sound intensity value and leakage rate of the leakage points with different apertures on the hole plugging surface of the test piece 1 are fitted, and the relationship curve between the net sound intensity value of the leakage point and the leakage rate is obtained as follows:

[0087] L 测量 =0.0769(I k ) 3 +2.6586(I k ) 2 +79.406I k +1062.5

[0088] R 2 =0.9774

[0089] Among them, L 测量 is the leakage rate of the leak point, I k is the net sound intensity at the leakage point.

[0090] The leakage rate of the containment boundary cable hole sealing surface and the leakage rate of a single leakage point on the containment boundary cable hole sealing surface have different meanings and cannot be equivalently converted. Therefore, a theoretical conversion is required. The leakage rate of the containment boundary cable hole sealing surface is the sum of the final values ​​of the leakage rates of each leakage point on the containment boundary cable hole sealing surface. In this embodiment, as one of the feasible methods, the net sound intensity value of each leakage point on the containment boundary cable hole sealing surface is measured, and the net sound intensity value and leakage rate of each leakage point on the containment boundary cable hole sealing surface are calculated by combining the relationship curve between the net sound intensity value and the leakage rate of the leakage point, including the following steps:

[0091] Find out the leakage points on the sealing surface of the cable holes at the boundary of the containment;

[0092] Measure the reference sound intensity value and test sound intensity value of each leakage point on the sealing surface of the cable hole at the containment boundary;

[0093] Substitute the reference sound intensity value and the test sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment;

[0094] Substitute the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the relationship curve between the net sound intensity value of the leakage point and the leakage rate to obtain the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment.

[0095] In this embodiment, as one of the achievable methods, the net sound intensity value formula of the leakage point is:

[0096]

[0097] Among them, I k is the net sound intensity value at the leakage point, I j is the test sound intensity value at the leakage point, I o is the benchmark sound intensity value at the leakage point.

[0098] The leakage point of the sealing surface of the cable hole at the boundary of the containment is unknown, so it is necessary to find the leakage point of the sealing surface of the cable hole at the boundary of the containment. The earphone of the ultrasonic leak detector 3 is used to receive the 38kHZ sound source and change it into a regular "beep" sound. This feature can be used to cooperate with the probe of the ultrasonic leak detector 3 to find the leakage point of the sealing surface of the cable hole at the boundary of the containment. In this embodiment, as one of the feasible methods, finding a single leakage point of the sealing surface of the cable hole at the boundary of the containment includes the following steps:

[0099] The probe of the ultrasonic leak detector 3 scans along the sealing surface of the cable hole at the boundary of the containment, and cooperates with the earphone of the ultrasonic leak detector 3 to mark the place where the sound is continuously detected within the specified range of the sealing surface of the cable hole at the boundary of the containment and no sound is detected around the specified range as a single leakage place of the sealing surface of the cable hole at the boundary of the containment;

[0100] The probe of the ultrasonic leak detector 3 scans the single leakage point on the sealing surface of the cable hole at the boundary of the containment shell. In conjunction with the earphone of the ultrasonic leak detector 3, the point where the sound of the single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is the loudest and the point where the display value of the ultrasonic leak detector 3 is the largest is marked as the single leakage point on the sealing surface of the cable hole at the boundary of the containment shell.

[0101] In this embodiment, as one of the achievable methods, measuring the reference sound intensity value and the test sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment vessel includes the following steps:

[0102] The probe of the ultrasonic leak detector 3 scans the surrounding environment of a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and cooperates with the earphone of the ultrasonic leak detector 3. When there is no sound in the surrounding environment of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and the display value of the ultrasonic leak detector 3 is the minimum, the sound intensity value displayed by the ultrasonic leak detector 3 at this time is used as the reference sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and recorded;

[0103] The probe of the ultrasonic leak detector 3 scans a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and the sound intensity value displayed by the ultrasonic leak detector 3 at this time is used as the test sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and is recorded.

[0104] In this embodiment, as one of the feasible methods, the sealing surface of the cable hole at the boundary of the containment is 0.5 cm 2 Sound is detected continuously within 0.5cm 2 The place where no sound is detected in the surrounding area is marked as a single leakage point on the sealing surface of the cable hole at the containment boundary.

[0105] The fitting degree of the relationship curve between the net sound intensity value and the leakage rate of the leakage point is above 0.9, so it can be considered that the relationship curve between the net sound intensity value and the leakage rate of the leakage point is credible, and can guide the leakage rate measurement of the leakage point on the containment boundary cable hole sealing surface. However, considering that the relationship curve between the net sound intensity value and the leakage rate of the leakage point is obtained by fitting limited data, it is also necessary to consider the net sound intensity value of the leakage point on the containment boundary cable hole sealing surface to determine the final value of the leakage rate of the leakage point on the containment boundary cable hole sealing surface. In the present embodiment, as one of the feasible methods, the final value of the leakage rate of a single leakage point on the containment boundary cable hole sealing surface is determined according to the net sound intensity value and leakage rate of a single leakage point on the containment boundary cable hole sealing surface, including the following steps:

[0106] When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is less than -27, the final value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment is determined to be 0;

[0107] When -27≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 500mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 500mL / min;

[0108] When -9≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -1, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is (500-1000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1000 mL / min;

[0109] When -1≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 3, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1000-1500) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1500 mL / min;

[0110] When 3≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1500-2000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 2000 mL / min;

[0111] When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is ≥9, it is determined that the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is greater than 2L / min.

[0112] In this embodiment, as one of the feasible ways, the final values ​​of the leakage rates of the various leakage points on the sealing surface of the cable hole at the boundary of the containment are added together to obtain the leakage rate of the sealing surface of the cable hole at the boundary of the containment.

[0113] In this embodiment, as one of the feasible methods, the model of the local leak detector 4 is JLY-Ⅳ, the range is (0~20)L / min, the accuracy is 2%FS, and the minimum detection value is 500mL / min; the specification of the ultrasonic leak detector 3 is (-20~120)dBμV, the resolution is 0.1dBμV, and the measurement error is ±0.5dBμV; the local leak detector 4 is connected to the air compressor to realize the pressurization and depressurization of the pressurized space of the test piece 1.

[0114] The containment boundary cable hole plugging and leak detection method of this embodiment successfully detects and processes the leakage point on the containment boundary cable hole plugging surface.

[0115] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for plugging and leak detection of cable holes at the boundary of a containment vessel, characterized in that: The steps include: Making a test piece for plugging a cable hole at the containment boundary (1); Measure the net sound intensity and leakage rate of the leakage points with different hole diameters on the hole sealing surface of the test piece (1); With the net sound intensity value of the leakage point as the horizontal coordinate and the leakage rate of the leakage point as the vertical coordinate, the net sound intensity value and leakage rate of the leakage points with different hole diameters on the hole plugging surface of the test piece (1) are fitted to obtain a relationship curve between the net sound intensity value of the leakage point and the leakage rate; Measure the net sound intensity values ​​of leakage points with different apertures on the sealing surface of the cable hole at the boundary of the containment, and calculate the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment by combining the relationship curve between the net sound intensity value of the leakage point and the leakage rate; According to the net sound intensity value and leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment is determined; According to the final value of the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment, the leakage rate of the sealing surface of the cable hole at the boundary of the containment is calculated.

2. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 1, characterized in that: According to the size of the cable hole at the containment boundary and the amount of silicone rubber used to seal the cable hole at the containment boundary, a test piece (1) for sealing the cable hole at the containment boundary is manufactured; the test piece (1) for sealing the cable hole at the containment boundary is a sealed box, which comprises a first box (11), a second box (12) and a blind plate (13) with a nozzle; the first box (11) is a cylindrical structure with two ends open, and a plurality of steel pipes with different apertures are arranged horizontally inside and silicone rubber is poured to form a leakage hole sealing surface with leakage points of different apertures, which is used to simulate the cable hole sealing surface with various leakage points at the containment boundary; the second box (12) is a cylindrical structure with two ends open, and the right port is sealedly connected to the left port of the first box (11), and the left port is sealedly connected to the blind plate (13) with a nozzle to form a pressurized space; the test piece (1) for sealing the cable hole at the containment boundary is leak-free as a whole.

3. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 2, characterized in that: Measuring the net sound intensity value and leakage rate of leakage points with different hole diameters on the hole sealing surface of the test piece (1) includes the following steps: Before the left end of the second box (12) is sealed and connected to the blind plate (13) with a nozzle, the ultrasonic sound source (2) is fixed with adhesive tape inside the second box (12), with the emission port of the ultrasonic sound source (2) facing the first box (11); The left port of the second box (12) is sealedly connected to the blind plate (13) with a nozzle; Gluing sound insulation cotton to the outside of the second box (12); The net sound intensity values ​​and leakage rates of leakage points with different hole diameters on the hole sealing surface of the test piece (1) are measured respectively.

4. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 3 is characterized in that: Measuring the net sound intensity value and leakage rate of a single leakage point on the hole sealing surface of the test piece (1) comprises the following steps: By means of a local leak detector (4), a test pressure is charged into the pressurized space of the test piece (1) and the pressure is maintained, wherein the test pressure is consistent with the pressure inside the containment; Open a single leak point on the hole plugging surface of the test piece (1), use a local leak detector (4) to measure the leakage rate of the single leak point on the hole plugging surface of the test piece (1) by a flow supplement method, and when the display value of the local leak detector (4) is stable, use the display value of the local leak detector (4) at this time as the leakage rate of the single leak point on the hole plugging surface of the test piece (1) and record it; The local leak detector (4) is turned off and the pressure of the test piece (1) is relieved; After the pressure relief of the test piece (1) is completed, the reference sound intensity value and the test sound intensity value of a single leakage point on the sealing surface of the leakage hole of the test piece (1) are measured using an ultrasonic leak detector (3) and recorded; Substitute the reference sound intensity value and the test sound intensity value of a single leakage point on the hole sealing surface of the test piece (1) into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of the single leakage point on the hole sealing surface of the test piece (1) and record it.

5. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 4, characterized in that: The reference sound intensity value and the test sound intensity value of a single leakage point on the hole sealing surface of the test piece (1) are measured and recorded using an ultrasonic leak detector (3), including the following steps: The probe of the ultrasonic leak detector (3) scans the environment around a single leak point on the hole plugging surface of the test piece (1), and when there is no sound around the single leak point on the hole plugging surface of the test piece (1) and the display value of the ultrasonic leak detector (3) is the minimum, the sound intensity value displayed by the ultrasonic leak detector (3) at this time is used as the reference sound intensity value of the single leak point on the hole plugging surface of the test piece (1) and recorded; The probe of the ultrasonic leak detector (3) scans a single leak point on the hole sealing surface of the test piece (1), and the sound intensity value displayed by the ultrasonic leak detector (3) at this time is used as the test sound intensity value of the single leak point on the leak hole sealing surface of the test piece (1) and recorded.

6. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 1, characterized in that: The net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment is measured, and the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment is calculated by combining the relationship curve between the net sound intensity value of the leakage point and the leakage rate, including the following steps: Find out the leakage points on the sealing surface of the cable holes at the boundary of the containment; Measure the reference sound intensity value and test sound intensity value of each leakage point on the sealing surface of the cable hole at the containment boundary; Substitute the reference sound intensity value and the test sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the net sound intensity value formula of the leakage point to obtain the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment; Substitute the net sound intensity value of each leakage point on the sealing surface of the cable hole at the boundary of the containment into the relationship curve between the net sound intensity value of the leakage point and the leakage rate to obtain the leakage rate of each leakage point on the sealing surface of the cable hole at the boundary of the containment.

7. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 6, characterized in that: Finding a single leakage point on the sealing surface of the cable hole at the containment boundary includes the following steps: The probe of the ultrasonic leak detector (3) scans along the sealing surface of the cable hole at the boundary of the containment, and in conjunction with the earphone of the ultrasonic leak detector (3), a place where sound is continuously detected within a specified range of the sealing surface of the cable hole at the boundary of the containment and no sound is detected around the specified range is marked as a single leakage point of the sealing surface of the cable hole at the boundary of the containment; The probe of the ultrasonic leak detector (3) scans a single leak point on the sealing surface of the cable hole at the boundary of the containment shell, and in conjunction with the earphone of the ultrasonic leak detector (3), the point where the sound of the single leak point on the sealing surface of the cable hole at the boundary of the containment shell is the loudest and the point where the ultrasonic leak detector (3) displays the largest value is marked as the single leak point on the sealing surface of the cable hole at the boundary of the containment shell.

8. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 6, characterized in that: Measuring the reference sound intensity value and test sound intensity value of a single leakage point on the sealing surface of the cable hole at the containment boundary includes the following steps: The probe of the ultrasonic leak detector (3) scans the surrounding environment of a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and cooperates with the earphone of the ultrasonic leak detector (3). When there is no sound in the surrounding environment of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and the display value of the ultrasonic leak detector (3) is the minimum, the sound intensity value displayed by the ultrasonic leak detector (3) at this time is used as the reference sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and is recorded; The probe of the ultrasonic leak detector (3) scans a single leakage point on the sealing surface of the cable hole at the boundary of the containment, and the sound intensity value displayed by the ultrasonic leak detector (3) at this time is used as the test sound intensity value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment and is recorded.

9. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 1, characterized in that: According to the net sound intensity value and leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is determined, including the following steps: When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is less than -27, the final value of the single leakage point on the sealing surface of the cable hole at the boundary of the containment is determined to be 0; When -27≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 500mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 500mL / min; When -9≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than -1, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is (500-1000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1000 mL / min; When -1≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 3, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1000-1500) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 1500 mL / min; When 3≤the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is less than 9, and the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is between (1500-2000) mL / min, the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment shell is determined to be 2000 mL / min; When the net sound intensity value of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is ≥9, it is determined that the final value of the leakage rate of a single leakage point on the sealing surface of the cable hole at the boundary of the containment is greater than 2L / min.

10. The method for plugging and detecting leakage of cable holes at the boundary of a containment vessel according to claim 1, characterized in that: The final values ​​of the leakage rates of the various leakage points on the sealing surface of the cable hole at the boundary of the containment are added together to obtain the leakage rate of the sealing surface of the cable hole at the boundary of the containment.

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