A test device and method for containment mechanical penetration leakage rate

Abstract

The application discloses a kind of test device and method of containment mechanical penetration leakage rate, including first isolation valve, first test valve, second isolation valve, pressure source, second test valve, containment and third isolation valve;First isolation valve and the one end of first test valve and the one end of second isolation valve are communicated, the other end of first test valve and the outlet of pressure source and the one end of second test valve are communicated, the other end of second test valve and the other end of second isolation valve are communicated with the one end of penetration pipeline, the other end of penetration pipeline is communicated with third isolation valve after passing through containment, measuring equipment is provided on pressure source, the device and method can accurately calculate the leakage rate of isolation valve.

Description

Technical Field

[0001] The invention belongs to the field of containment leakage rate testing, and relates to a device and method for testing the leakage rate of a containment mechanical penetration piece. Background Art

[0002] The leakage rate test results for mechanical containment penetrations currently used in nuclear power plants are based on the make-up water flow rate after a leak. Generally, the leakage rate of containment penetrations is very low, requiring very high accuracy from the make-up water flowmeter, resulting in high instrument investment costs. During leakage rate measurements, a conservative estimate is used to calculate the leakage rate of both upstream and downstream isolation valves as the leakage rate of a single valve. As a result, the resulting leakage rate is often higher than the actual value and contains significant errors. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a test device and method for the leakage rate of a containment mechanical penetration, which can accurately measure the leakage rate of an isolation valve.

[0004] To achieve the above-mentioned object, the test device for leakage rate of mechanical penetration of containment shell according to the present invention comprises a first isolation valve, a first test valve, a second isolation valve, a pressure source, a second test valve, a containment shell and a third isolation valve;

[0005] The first isolation valve is connected with one end of the first test valve and one end of the second isolation valve, the other end of the first test valve is connected with the outlet of the pressure source and one end of the second test valve, the other end of the second test valve and the other end of the second isolation valve are connected with one end of the through-pipe, the other end of the through-pipe passes through the containment shell and is connected with the third isolation valve, and a measuring device is provided on the pressure source.

[0006] The pressure source is a compressed air tank.

[0007] The outlet of the compressed air box is connected to the first test valve and the second test valve through a merging main pipe.

[0008] The measuring device includes a first pressure gauge and an ambient thermometer, wherein the first pressure gauge is arranged in the compressed air box, the ambient thermometer is located outside the compressed air box, and the ambient thermometer is located in the containment shell.

[0009] The pressure source is a pressure-stabilizing water tank, which is provided with a water space at the bottom and an air space at the top, and the outlet of the water space is connected to the first test valve and the second test valve.

[0010] It also includes a system inside the containment shell and a system outside the containment shell. The system inside the containment shell is connected to the system outside the containment shell through a first isolation valve, a second isolation valve, a through pipeline and a third isolation valve.

[0011] The measuring device comprises a second pressure gauge and a liquid level gauge, wherein the liquid level gauge is arranged in the pressure stabilizing tank, and the second pressure gauge is arranged on the pipeline between the water space and the second test valve.

[0012] The outlet of the pressure stabilizing tank is connected with the first test valve and the second test valve through a merging main pipeline.

[0013] The test method for the leakage rate of the mechanical penetration of the containment vessel comprises the following steps:

[0014] 1) Close the first isolation valve and the second isolation valve;

[0015] 2) Open the first test valve, and pressurize the pipeline between the first isolation valve and the second isolation valve to the design pressure P of the containment vessel, and keep stable;

[0016] 3) After the system pressure is stable, record the values of the first pressure gauge and the ambient thermometer, and the temperature T1;

[0017] 4) After the preset time t of the pressure stabilization test, record the values P2 and the temperature T2 of the first pressure gauge and the ambient thermometer;

[0018] 5) Calculate the total leakage rate Qa of the first isolation valve and the second isolation valve according to P1, P2, T1, T2 and t;

[0019] 6) Close the first test valve and the third isolation valve;

[0020] 7) Open the first isolation valve, and reduce the pressure of the pipeline between the first isolation valve and the second isolation valve to the normal pressure;

[0021] 8) Open the second test valve, and pressurize the penetration pipeline between the second isolation valve and the third isolation valve to the design pressure P of the containment vessel, and keep stable;

[0022] 9) Repeat steps 3) to 5), and calculate the total leakage rate Qb of the second isolation valve and the third isolation valve;

[0023] 10) Close the first isolation valve;

[0024] 11) Open the first test valve, and pressurize the pipeline between the first isolation valve and the third isolation valve to the design pressure P of the containment vessel, and keep stable;

[0025] 12) Repeat steps 3) to 5), and calculate the total leakage rate Qc of the first isolation valve and the third isolation valve;

[0026] 13) Calculate the leakage rate of the first isolation valve: Q1=(Qa-Qb+Qc) / 2;

[0027] Calculate the leakage rate of the second isolation valve: Q2=(Qa+Qb-Qc) / 2;

[0028] Calculate the leakage rate of the third isolation valve: Q3 = (-Qa + Qb + Qc) / 2.

[0029] The test method for the leakage rate of containment mechanical penetrations of the present invention comprises the following steps:

[0030] 1) Close the first isolation valve and the second isolation valve, and open the third isolation valve;

[0031] 2) Open the first test valve and gravity fill the pipe between the first isolation valve and the second isolation valve with water until it is full;

[0032] 3) Inflate and pressurize the water in the water space through the air space until the pressure measured by the second pressure gauge reaches the design pressure P of the containment and remains stable;

[0033] 4) Record the value H1 of the level gauge;

[0034] 5) After the preset time t of the voltage stabilization test, record the value H2 of the liquid level gauge;

[0035] 6) Calculate the total leakage rate Qa of the first isolation valve and the second isolation valve based on H1, H2 and t;

[0036] 7) Close the third isolation valve and the first test valve;

[0037] 8) Open the first isolation valve to reduce the pressure of the pipeline between the first isolation valve and the second isolation valve to normal pressure;

[0038] 9) Open the first test valve and gravity fill the through-pipe with water until it is full;

[0039] 10) Repeat steps 3) to 6) to calculate the total leakage rate Qb of the second isolation valve and the third isolation valve;

[0040] 11) Close the first isolation valve, open the first test valve, and gravity fill the pipe between the first isolation valve and the second isolation valve with water until it is full;

[0041] 12) Repeat steps 3) to 6) to calculate the total leakage rate Qc of the first isolation valve and the third isolation valve;

[0042] 13) Calculate the leakage rate of the first isolation valve: Q4 = (Qa - Qb + Qc) / 2;

[0043] Calculate the leakage rate of the second isolation valve: Q5 = (Qa + Qb - Qc) / 2;

[0044] Calculate the leakage rate of the third isolation valve: Q6 = (-Qa + Qb + Qc) / 2.

[0045] The present invention has the following beneficial effects:

[0046] During specific operation, the test device and method for the leakage rate of containment mechanical penetration parts described in the present invention are as follows: the isolation valve whose leakage needs to be measured and its adjacent isolation valve are closed, and other valves on the connected pipeline are opened. Pressure medium is injected into the pipeline between the two isolation valves, and the pressure is maintained at the design value for a period of time. The total leakage of the two isolation valves is calculated based on the pressure change of the pressure medium. The above steps are repeated to calculate the total leakage of the isolation valve and other adjacent isolation valves, and finally the leakage rate of each isolation valve is obtained with high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural diagram of Example 1;

[0048] Figure 2 This is a structural diagram of Example 2.

[0049] Among them, 1 is the system inside the containment, 2 is the first isolation valve, 3 is the second isolation valve, 4 is the through pipeline, 5 is the containment, 6 is the third isolation valve, 7 is the system outside the containment, 8 is the first test valve, 9 is the second test valve, 10 is the pressure source, 10-1 is the water space, 10-2 is the air space, 10-3 is the liquid level gauge, 11 is the second pressure gauge, 12 is the ambient temperature gauge, and 13 is the first pressure gauge. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0051] The accompanying drawings illustrate schematic diagrams of the structures of the disclosed embodiments of the present invention. These figures are not drawn to scale; for the purpose of clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0052] refer to Figure 1The test device for the leakage rate of the containment mechanical penetration of the present invention comprises a first isolation valve 2, a first test valve 8, a second isolation valve 3, a pressure source 10, a second test valve 9, a containment 5 and a third isolation valve 6;

[0053] The first isolation valve 2 is connected with one end of the first test valve 8 and one end of the second isolation valve 3. The other end of the first test valve 8 is connected with the outlet of the pressure source 10 and one end of the second test valve 9. The other end of the second test valve 9 and the other end of the second isolation valve 3 are connected with one end of the through-pipe 4. The other end of the through-pipe 4 passes through the containment shell 5 and is connected with the third isolation valve 6. A measuring device is provided on the pressure source 10.

[0054] Example 1

[0055] refer to Figure 1 The pressure source 10 is a compressed air box, and the measuring equipment includes a first pressure gauge 13 and an ambient thermometer 12, wherein the first pressure gauge 13 is arranged in the compressed air box, the ambient thermometer 12 is located outside the compressed air box, and the ambient thermometer 12 is located in the containment shell 5, and the outlet of the compressed air box is connected to the first test valve 8 and the second test valve 9 through a merging main pipe.

[0056] The specific working process of this embodiment is as follows:

[0057] 1) Close the first isolation valve 2 and the second isolation valve 3;

[0058] 2) Open the first test valve 8, inflate and pressurize the pipeline between the first isolation valve 2 and the second isolation valve 3 to the design pressure P of the containment vessel 5, and keep it stable;

[0059] 3) After the system pressure stabilizes, record the value P1 and temperature T1 of the first pressure gauge 13 and the ambient thermometer 12;

[0060] 4) After the pressure stabilization test is completed for a preset time t, the value P2 and temperature T2 of the first pressure gauge 13 and the ambient thermometer 12 are recorded;

[0061] 5) Calculate the total leakage rate Qa of the first isolation valve 2 and the second isolation valve 3 based on P1, P2, T1, T2 and t;

[0062] 6) Close the first test valve 8 and the third isolation valve 6;

[0063] 7) Open the first isolation valve 2 to reduce the pressure of the pipeline between the first isolation valve 2 and the second isolation valve 3 to normal pressure;

[0064] 8) Open the second test valve 9 and pressurize the through pipe 4 between the second isolation valve 3 and the third isolation valve 6 to the design pressure P of the containment vessel 5 and keep it stable;

[0065] 9) Repeat steps 3) to 5) to calculate the total leakage rate Qb of the second isolation valve 3 and the third isolation valve 6;

[0066] 10) Close the first isolation valve 2;

[0067] 11) Open the first test valve 8 and pressurize the pipeline between the first isolation valve 2 and the third isolation valve 6 to the design pressure P of the containment vessel 5 and keep it stable;

[0068] 12) Repeat steps 3) to 5) to calculate the total leakage rate Qc of the first isolation valve 2 and the third isolation valve 6;

[0069] 13) Calculate the leakage rate of the first isolation valve 2: Q1 = (Qa - Qb + Qc) / 2;

[0070] Calculate the leakage rate of the second isolation valve 3: Q2 = (Qa + Qb - Qc) / 2;

[0071] The leakage rate of the third isolation valve 6 is calculated as: Q3 = (-Qa + Qb + Qc) / 2.

[0072] Example 2

[0073] refer to Figure 2 The pressure source 10 is a pressure-stabilizing water tank, which is provided with a water space 10-1 at the bottom and an air space 10-2 at the top. The outlet of the water space 10-1 is connected to the first test valve 8 and the second test valve 9. The measuring equipment includes a second pressure gauge 11 and a liquid level gauge 10-3, wherein the liquid level gauge 10-3 is arranged in the pressure-stabilizing water tank, and the second pressure gauge 11 is arranged on the pipeline between the water space 10-1 and the second test valve 9. In addition, the present invention also includes a system inside the containment shell 1 and a system outside the containment shell 7, wherein the system inside the containment shell 1 is connected to the system outside the containment shell 7 via the first isolation valve 2, the second isolation valve 3, the through pipeline 4 and the third isolation valve 6, and the outlet of the pressure-stabilizing water tank is connected to the first test valve 8 and the second test valve 9 through the merging main pipe.

[0074] The specific working process of this embodiment is as follows:

[0075] 1) Close the first isolation valve 2 and the second isolation valve 3, and open the third isolation valve 6;

[0076] 2) Open the first test valve 8 and gravity fill the pipe between the first isolation valve 2 and the second isolation valve 3 with water until it is full;

[0077] 3) Inflate and pressurize the water in the water space 10-1 through the air space 10-2 until the pressure measured by the second pressure gauge 11 reaches the design pressure P of the containment vessel 5 and remains stable;

[0078] 4) Record the value H1 of the level gauge 10-3;

[0079] 5) After the preset time t of the voltage stabilization test, record the value H2 of the liquid level gauge 10-3;

[0080] 6) Calculate the total leakage rate Qa of the first isolation valve 2 and the second isolation valve 3 based on H1, H2 and t;

[0081] 7) Close the third isolation valve 6 and the first test valve 8;

[0082] 8) Open the first isolation valve 2 to reduce the pressure of the pipeline between the first isolation valve 2 and the second isolation valve 3 to normal pressure;

[0083] 9) Open the first test valve 8 and gravity fill the through-pipe 4 with water until it is full;

[0084] 10) Repeat steps 3) to 6) to calculate the total leakage rate Qb of the second isolation valve 3 and the third isolation valve 6;

[0085] 11) Close the first isolation valve 2, open the first test valve 8, and gravity fill the pipe between the first isolation valve 2 and the second isolation valve 3 with water until it is full;

[0086] 12) Repeat steps 3) to 6) to calculate the total leakage rate Qc of the first isolation valve 2 and the third isolation valve 6;

[0087] 13) Calculate the leakage rate of the first isolation valve 2: Q4 = (Qa-Qb+Qc) / 2;

[0088] Calculate the leakage rate of the second isolation valve 3: Q5 = (Qa + Qb - Qc) / 2;

[0089] The leakage rate of the third isolation valve 6 is calculated: Q6 = (-Qa + Qb + Qc) / 2.

[0090] The present invention does not require a high-precision water replenishment flow meter, thus saving costs, and can accurately calculate the leakage rate of each isolation valve. It is applicable to containment penetrations of various media.

Claims

1. A test method for leakage rate of containment mechanical penetrations, characterized in that: A test device based on the leakage rate of a containment mechanical penetration, the test device comprising a first isolation valve (2), a first test valve (8), a second isolation valve (3), a pressure source (10), a second test valve (9), a containment (5), and a third isolation valve (6); The first isolation valve (2) is connected to one end of the first test valve (8) and one end of the second isolation valve (3), the other end of the first test valve (8) is connected to the outlet of the pressure source (10) and one end of the second test valve (9), the other end of the second test valve (9) and the other end of the second isolation valve (3) are connected to one end of the through-pipe (4), the other end of the through-pipe (4) passes through the containment (5) and is connected to the third isolation valve (6), and a measuring device is provided on the pressure source (10); The pressure source (10) is a compressed air tank; The outlet of the compressed air box is connected to the first test valve (8) and the second test valve (9) through a merging main pipe; The measuring device comprises a first pressure gauge (13) and an ambient temperature gauge (12), wherein the first pressure gauge (13) is arranged in the compressed air box, the ambient temperature gauge (12) is located outside the compressed air box, and the ambient temperature gauge (12) is located in the containment shell (5); The following steps are involved: 1) Close the first isolation valve (2) and the second isolation valve (3); 2) Open the first test valve (8), inflate and pressurize the pipeline between the first isolation valve (2) and the second isolation valve (3) to the design pressure P of the containment vessel (5), and keep it stable; 3) After the system pressure stabilizes, record the value P1 and temperature T1 of the first pressure gauge (13) and the ambient thermometer (12); 4) After the pressure stabilization test for a preset time t, record the value P2 and temperature T2 of the first pressure gauge (13) and the ambient thermometer (12); 5) Calculate the total leakage rate Qa of the first isolation valve (2) and the second isolation valve (3) based on P1, P2, T1, T2 and t; 6) Close the first test valve (8) and the third isolation valve (6); 7) Open the first isolation valve (2) to reduce the pressure of the pipeline between the first isolation valve (2) and the second isolation valve (3) to normal pressure; 8) Open the second test valve (9), and pressurize the through pipe (4) between the second isolation valve (3) and the third isolation valve (6) to the design pressure P of the containment vessel (5), and keep it stable; 9) Repeat steps 3) to 5) to calculate the total leakage rate Qb of the second isolation valve (3) and the third isolation valve (6); 10) Close the first isolation valve (2); 11) Open the first test valve (8), and pressurize the pipeline between the first isolation valve (2) and the third isolation valve (6) to the design pressure P of the containment vessel (5), and keep it stable; 12) Repeat steps 3) to 5) to calculate the total leakage rate Qc of the first isolation valve (2) and the third isolation valve (6); 13) Calculate the leakage rate of the first isolation valve (2): Q1 = (Qa-Qb+Qc) / 2; Calculate the leakage rate of the second isolation valve (3): Q2 = (Qa + Qb - Qc) / 2; Calculate the leakage rate of the third isolation valve (6): Q3 = (-Qa + Qb + Qc) / 2.

2. The containment mechanical penetration leakage rate test method according to claim 1, characterized in that: A pressure-stabilizing water tank is used as a pressure source (10) instead of a compressed air tank. The pressure-stabilizing water tank is provided with a water space (10-1) at the bottom and an air space (10-2) at the top. The outlet of the water space (10-1) is connected to a first test valve (8) and a second test valve (9). The measuring device comprises a second pressure gauge (11) and a liquid level gauge (10-3), wherein the liquid level gauge (10-3) is arranged in the pressure-stabilizing water tank, and the second pressure gauge (11) is arranged on the pipeline between the water space (10-1) and the second test valve (9); The test method for the leakage rate of containment mechanical penetrations comprises the following steps: 1) Close the first isolation valve (2) and the second isolation valve (3), and open the third isolation valve (6); 2) Open the first test valve (8) and gravity fill the pipe between the first isolation valve (2) and the second isolation valve (3) with water until it is full; 3) Inflate and pressurize the water in the water space (10-1) through the air space (10-2) until the pressure measured by the second pressure gauge (11) reaches the design pressure P of the containment vessel (5) and remains stable; 4) Record the value H1 of the level gauge (10-3); 5) After the preset time t of the voltage stabilization test, record the value H2 of the level gauge (10-3); 6) Calculate the total leakage rate Qa of the first isolation valve (2) and the second isolation valve (3) based on H1, H2 and t; 7) Close the third isolation valve (6) and the first test valve (8); 8) Open the first isolation valve (2) to reduce the pressure of the pipeline between the first isolation valve (2) and the second isolation valve (3) to normal pressure; 9) Open the first test valve (8) and gravity fill the through-pipe (4) with water until it is full; 10) Repeat steps 3) to 6) to calculate the total leakage rate Qb of the second isolation valve (3) and the third isolation valve (6); 11) Close the first isolation valve (2), open the first test valve (8), and gravity fill the pipe between the first isolation valve (2) and the second isolation valve 3 with water until it is full; 12) Repeat steps 3) to 6) to calculate the total leakage rate Qc of the first isolation valve (2) and the third isolation valve (6); 13) Calculate the leakage rate of the first isolation valve (2): Q4 = (Qa-Qb+Qc) / 2; Calculate the leakage rate of the second isolation valve (3): Q5 = (Qa + Qb - Qc) / 2; Calculate the leakage rate of the third isolation valve (6): Q6 = (-Qa + Qb + Qc) / 2.

3. The containment mechanical penetration leakage rate test method according to claim 2, characterized in that: The invention also includes an internal containment system (1) and an external containment system (7). The internal containment system (1) is connected to the external containment system (7) via a first isolation valve (2), a second isolation valve (3), a through pipe (4) and a third isolation valve (6).

4. The test method for leakage rate of containment mechanical penetrations according to claim 2, characterized in that: The outlet of the pressure-stabilizing water tank is connected to the first test valve (8) and the second test valve (9) through a merging main pipe.

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