Sampling test device and test method

Abstract

The application belongs to the technical field of nuclear power and discloses a sampling test device and a test method. The test method is suitable for the sampling test device. The sampling test device comprises a pit simulation assembly and a sampling assembly. The pit simulation assembly comprises a liquid inlet pipe and a scale. The liquid inlet pipe is connected to an exhaust valve of a sampling pipeline and is used for injecting a test liquid. The scale is used for measuring the height of the test liquid in the liquid inlet pipe. The sampling assembly comprises a vacuum structure, a sampling bottle and a flow meter which are sequentially arranged along the flow direction of the test liquid. The vacuum structure provides power for sampling, so that the test liquid can flow along the sampling pipeline to the sampling bottle. The flow meter is arranged upstream of the sampling bottle. The flow value of the test liquid measured by the flow meter can determine whether the sampling is normal, so as to ensure that the pit of the containment vessel after an accident can be sampled, and the core melt condition of the nuclear power plant after the accident can be determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear power technology, in particular to a sampling test device and a test method. BACKGROUND

[0002] In order to ensure the safety of the nuclear power plant and ensure the timely response after the accident of the nuclear power plant, it is necessary to regularly arrange sampling to monitor the primary loop radioactive dose level and the water quality, which includes sampling of the primary loop coolant and its auxiliary system under normal operating conditions of the unit, sampling of the containment atmosphere under normal operating conditions of the unit, sampling of the containment atmosphere under accident conditions (dilution and non-dilution samples), sampling of the primary loop coolant system under accident conditions, and sampling of the containment pit after the accident, etc. The sampling of the containment pit after the accident is an important parameter for judging the fuel damage condition and the equipment corrosion condition in the containment after the accident, and the sampling under normal conditions can be verified during the commissioning stage (cold test or hot test) of the unit, but the sampling of the containment pit after the water flooding in the accident of the nuclear power plant cannot be simulated in practice, which leads to the failure to verify whether the representative sample function can be taken from the containment pit after the water flooding, and once the accident occurs, it may lead to sampling failure and affect the judgment of the core melt condition of the nuclear power plant after the accident.

[0003] Therefore, there is an urgent need for a sampling test device and a test method to solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide a sampling test device and a test method, which can simulate the sampling after the accident of the nuclear power plant, ensure smooth sampling of the pit of the nuclear power plant after the accident, and ensure the judgment of the core melt condition of the nuclear power plant after the accident.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The sampling test device comprises:

[0007] The pit simulation assembly comprises a liquid inlet pipe and a scale, the liquid inlet pipe is used to connect to the exhaust valve at the end of the sampling pipeline, and is used to inject a test liquid, and the scale is used to measure the height of the test liquid in the liquid inlet pipe.

[0008] The sampling assembly comprises a vacuum structure, a sampling bottle and a flow meter, the flow meter, the sampling bottle and the vacuum structure are sequentially arranged on the sampling pipeline along the flow direction of the test liquid, the vacuum structure is used to provide a vacuum degree, the sampling bottle is used for sampling, and the flow meter is used to detect the flow of the liquid in the sampling pipeline.

[0009] As an optional technical solution, the sampling assembly further comprises a first valve, which is arranged upstream of the flow meter along the flow direction of the liquid in the sampling pipeline.

[0010] As an optional technical solution, the sampling assembly further comprises a first isolation valve and a second isolation valve, which are arranged at two ends of the sampling bottle respectively.

[0011] As an optional technical solution, the vacuum structure comprises an ejector, a water tank and a centrifugal pump, the ejector has a first inlet, a second inlet and an outlet, the water tank is connected with the centrifugal pump, the centrifugal pump is connected with the first inlet of the ejector, the second inlet is connected with the sampling pipeline, and the outlet is used for liquid outflow.

[0012] As an optional technical solution, the vacuum structure further comprises a check valve, which is arranged between the centrifugal pump and the ejector.

[0013] As an optional technical solution, a funnel is arranged at the inlet of the liquid inlet pipe.

[0014] As an optional technical solution, the sampling test device further comprises a third isolation valve, which is arranged in the sampling pipeline and is arranged on the side of the exhaust valve away from the liquid inlet pipe.

[0015] As an optional technical solution, the liquid inlet pipe and the scale are integrally formed.

[0016] As an optional technical solution, the sampling test device further comprises a waste liquid storage tank, which is arranged downstream of the sampling assembly and is used for storing waste liquid.

[0017] The application adopts the following technical solutions:

[0018] A test method suitable for the above sampling test device, the test method comprises the following steps:

[0019] S1: connecting the liquid inlet pipe to the exhaust valve at the end of the sampling pipeline;

[0020] S2: injecting the test liquid into the liquid inlet pipe until the height indicated by the scale reaches the preset height value;

[0021] S3: starting the vacuum structure, continuously injecting the test liquid into the liquid inlet pipe, and ensuring that the height of the test liquid in the liquid inlet pipe remains at the preset height value;

[0022] S4: observing whether the real-time flow value of the flow meter meets the sampling requirements.

[0023] Advantages of the present application:

[0024] The application discloses a sampling test device which comprises a sump simulation assembly and a sampling assembly. The sump simulation assembly comprises a liquid inlet pipe and a scale. The liquid inlet pipe is connected to an exhaust valve of a sampling pipeline and is used for injecting a test liquid. The scale is used for measuring the height of the test liquid in the liquid inlet pipe. The sampling assembly comprises a vacuum structure, a sampling bottle and a flow meter which are sequentially arranged on the sampling pipeline along the flow direction of the test liquid. The vacuum structure provides power for sampling, so that the test liquid can flow along the sampling pipeline to the sampling bottle. The flow meter is arranged upstream of the sampling bottle. The flow value of the test liquid passing through the flow meter can be used to determine whether the sampling is normal. The sampling test device can ensure sampling of the sump of a containment vessel after an accident and can determine the core melt condition of a nuclear power plant after an accident.

[0025] The application further discloses a test method which is suitable for the sampling test device. The test method can simulate the sump after an accident by using the sump simulation assembly and can verify the sampling. Therefore, the sampling can be verified during the debugging stage or the normal operation stage. The test method can avoid the situation that the sampling requirements cannot be met after an accident of the power plant and the determination of the core melt condition after the accident of the power plant is affected. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the sampling test device of the embodiment of the application;

[0027] Figure 2 is Figure 1 is a partial enlarged view of A in FIG.

[0028] in the figure:

[0029] 1, exhaust valve;

[0030] 10, sump simulation assembly; 11, liquid inlet pipe; 111, funnel; 12, scale;

[0031] 211, injector; 212, water tank; 213, centrifugal pump; 214, check valve; 22, sampling bottle; 23, flow meter; 24, first valve; 25, first isolation valve; 26, second isolation valve;

[0032] 30, sampling pipeline; 31, third isolation valve;

[0033] 40, waste liquid storage tank. DETAILED DESCRIPTION

[0034] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the application. In addition, it should be noted that, in the drawings, only the parts related to the application are shown and not all the structures.

[0035] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of the present embodiment, the terms "upper", "lower", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] During the unit commissioning of a nuclear power plant, various sampling functions need to be verified. Normally, the power assembly arranged in the containment pit can sample in the slow containment pit. However, after an accident, the containment pit is flooded with water, and the power assembly arranged in the containment pit cannot sample. However, during commissioning, the containment pit cannot be actually flooded, and there is difficulty in verifying the sampling function after the containment pit is flooded after an accident, which brings difficulty to the sampling test.

[0039] Accordingly, the present embodiment provides a sampling test device.

[0040] As Figures 1 to 2As shown, the embodiment provides a sampling test device, which comprises a pit simulation assembly 10 and a sampling assembly. The pit simulation assembly 10 comprises a liquid inlet pipe 11 and a scale 12. The liquid inlet pipe 11 is used to connect to the exhaust valve 1 of the sampling pipeline 30, and is used to inject a test liquid. The scale 12 is used to measure the height of the test liquid in the liquid inlet pipe 11. The sampling assembly comprises a vacuum structure, a sampling bottle 22 and a flow meter 23. The vacuum structure, the sampling bottle 22 and the flow meter 23 are sequentially arranged on the sampling pipeline 30 along the flow direction of the test liquid. The vacuum structure is used to provide a vacuum degree. The sampling bottle 22 is used for sampling. The flow meter 23 is used to detect the flow of the liquid in the sampling pipeline 30. Specifically, in the embodiment, the liquid inlet pipe 11 is a U-shaped pipe. The test liquid is injected into the liquid inlet pipe 11 and the height of the test liquid is maintained at a certain height, which can simulate the water level in the containment pit after the accident. The test liquid is equivalent to the sample to be extracted. The sampling assembly is used to sample from the pit simulation assembly 10. The vacuum structure in the sampling assembly is used to provide a vacuum degree, which can make the test liquid flow along the sampling pipeline. The sampling bottle 22 is used to collect the sample. The flow meter 23 is arranged upstream of the sampling bottle 22, which is used to measure the flow of the test liquid in the sampling pipeline, and further determine whether the sampling assembly can successfully take the sample. If the sampling assembly can successfully take the sample, it can ensure that the sample of the water-flooded containment pit after the accident can be normally taken.

[0041] Further, the sampling assembly further comprises a first valve 24, which is arranged upstream of the flow meter 23 along the flow direction of the liquid in the sampling pipeline 30. Specifically, in the embodiment, the first valve 24 arranged upstream of the flow meter 23 can control the opening and closing of the sampling pipeline 30, which can conveniently control the flow or stop of the test liquid during the sampling test, and avoid unnecessary waste.

[0042] Further, the sampling assembly further comprises a first isolation valve 25 and a second isolation valve 26, which are respectively arranged at both ends of the sampling bottle 22. Specifically, in the embodiment, in order to ensure that the sampling bottle 22 can be detached from the sampling pipeline 30 after sampling is completed, the first isolation valve 25 and the second isolation valve 26 are respectively arranged at both ends of the sampling bottle 22. When it is necessary to detach the sampling bottle 22, the first isolation valve 25 and the second isolation valve 26 are both closed, and then the sampling bottle 22 is detached, and the sampling is completed.

[0043] Further, the vacuum structure comprises an ejector 211, a water tank 212 and a centrifugal pump 213, the ejector 211 has a first inlet, a second inlet and an outlet, the water tank 212 is connected with the centrifugal pump 213, the centrifugal pump 213 is connected with the first inlet of the ejector 211, the second inlet is connected with the sampling pipeline 30, and the outlet is used for liquid outflow. Specifically, in the embodiment, the ejector 211 is used as a vacuumizing element, which not only has the characteristics of compact structure, small volume and light weight, but also has high efficiency, is convenient to maintain and is helpful for sampling. The liquid in the water tank 212 is pumped to the ejector 211 under the action of the centrifugal pump 213, so that the ejector 211 generates a vacuum degree, and successful sampling is ensured.

[0044] Further, the vacuum structure further comprises a check valve 214, which is arranged between the centrifugal pump 213 and the ejector 211. Specifically, in the embodiment, the check valve 214 can ensure that the liquid in the water tank 212 is pumped to the ejector 211 by the centrifugal pump 213 in one direction, can ensure the normal work of the ejector 211, and can avoid the backflow of the liquid to reduce the vacuumizing performance of the ejector 211. Alternatively, in other embodiments, the number of check valves 214 can be set to two, which can avoid affecting the normal work of the ejector 211 when a single check valve 214 fails.

[0045] Further, a funnel 111 is arranged at the inlet of the liquid inlet pipe 11. Specifically, in the embodiment, the funnel 111 is arranged at the inlet of the liquid inlet pipe 11, which can facilitate the injection of test liquid into the liquid inlet pipe 11, improve the injection efficiency, and effectively avoid the waste of test liquid during the injection process.

[0046] Further, the sampling test device further comprises a third isolation valve 31, which is arranged in the sampling pipeline 30 and is arranged on the side of the exhaust valve 1 away from the liquid inlet pipe 11. Specifically, in the embodiment, the third isolation valve 31 can control the on-off between the pit simulation assembly 10 and the sampling pipeline 30, which is convenient for sampling control.

[0047] Further, the liquid inlet pipe 11 and the scale 12 are integrally formed. Specifically, in the embodiment, the liquid inlet pipe 11 and the scale 12 are integrally formed, that is, the liquid inlet pipe 11 itself has scales, which can facilitate reading the height of the test liquid in the liquid inlet pipe 11, and the liquid inlet pipe 11 does not need to be aligned with the scale 12, which can save reading time and improve work efficiency.

[0048] Further, the sampling test device further comprises a waste liquid storage tank 40, which is arranged downstream of the sampling assembly and is used for storing waste liquid. Specifically, in the embodiment, the waste liquid storage tank 40 is arranged downstream of the outlet of the ejector 211, so as to collect the mixed liquid of the test liquid and the liquid in the water tank 212 flowing out of the ejector 211, and avoid waste or pollution.

[0049] The embodiment also discloses a test method, which is suitable for the sampling test device and comprises the following steps:

[0050] S1: connecting the liquid inlet pipe 11 to the exhaust valve 1 at the end of the sampling pipeline 30.

[0051] Specifically, in the embodiment, several exhaust valves 1 with different heights are designed on the sampling pipeline 30, and when performing the test, the exhaust valve 1 with a height close to the water-flooded height to be tested is selected first, and the liquid inlet pipe 11 is connected to the exhaust valve 1.

[0052] S2: injecting the test liquid into the liquid inlet pipe 11 until the height indicated by the scale 12 reaches the preset height value.

[0053] Specifically, in the embodiment, the third isolation valve 31 is first opened, the test liquid is injected into the liquid inlet pipe 11 until the height of the test liquid in the liquid inlet pipe 11 reaches the preset value, at this time, the liquid inlet pipe 11 is equivalent to a water-flooded pit with a preset height, and the state simulation of the water-flooded containment pit is completed.

[0054] S3: starting the vacuum structure, continuously injecting the test liquid into the liquid inlet pipe 11, and ensuring that the height of the test liquid in the liquid inlet pipe 11 remains at the preset height value.

[0055] Specifically, in the embodiment, starting the vacuum structure first requires injecting sufficient liquid into the water tank 212 to ensure that the ejector 211 can be used, then starting the centrifugal pump 213 and the ejector 211 to generate a vacuum degree in the ejector 211, then opening the first valve 24, the first isolation valve 25 and the second isolation valve 26 to open the sampling channel, under the action of the ejector 211, the test liquid flows into the sampling bottle 22 along the sampling channel, and during the sampling test, the test liquid needs to be continuously injected into the liquid inlet pipe 11 to simulate the liquid surface in the containment pit which does not decrease significantly.

[0056] S4: observing whether the real-time flow value of the flow meter 23 meets the sampling requirements.

[0057] Specifically, in the present embodiment, the flow meter 23 can monitor the flow rate of the test liquid in the sampling pipeline 30 in real time, and it can be determined whether the sampling requirement can be met through the flow rate, and it can be indicated whether the function of the sampling system can be realized.

[0058] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation manners of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. All the implementation manners do not need to be enumerated here. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A sampling test apparatus, characterized in that, The sampling and testing device includes: A pit simulation component (10) includes an inlet pipe (11) and a scale (12). The inlet pipe (11) is connected to one of the exhaust valves (1) at the end of the sampling pipeline (30) for injecting test liquid. The scale (12) is used to measure the height of the test liquid in the inlet pipe (11). The sampling assembly includes a vacuum structure, a sampling bottle (22), and a flow meter (23). The flow meter (23), the sampling bottle (22), and the vacuum structure are arranged sequentially along the flow direction of the test liquid on the sampling pipeline (30). The vacuum structure is used to provide a vacuum degree. The sampling bottle (22) is used for sampling. The flow meter (23) is used to detect the flow rate of the test liquid in the sampling pipeline (30). The vacuum structure includes an ejector (211), a water tank (212), and a centrifugal pump (213). The ejector (211) has a first inlet, a second inlet, and an outlet. The water tank (212) is connected to the centrifugal pump (213). The centrifugal pump (213) is connected to the first inlet of the ejector (211). The second inlet is connected to the sampling pipeline (30). The outlet is used for liquid outflow. The liquid inlet pipe (11) is a U-shaped pipe.

2. The sampling and testing apparatus according to claim 1, characterized in that, The sampling assembly also includes a first valve (24), which is located upstream of the flow meter (23) along the flow direction of the liquid in the sampling pipeline (30).

3. The sampling and testing apparatus according to claim 1, characterized in that, The sampling assembly also includes a first isolation valve (25) and a second isolation valve (26), which are respectively disposed at both ends of the sampling bottle (22).

4. The sampling and testing apparatus according to claim 1, characterized in that, The vacuum structure also includes a check valve (214), which is disposed between the centrifugal pump (213) and the ejector (211).

5. The sampling and testing apparatus according to claim 1, characterized in that, A funnel (111) is provided at the inlet of the liquid inlet pipe (11).

6. The sampling and testing apparatus according to claim 1, characterized in that, The sampling test device also includes a third isolation valve (31), which is located in the sampling pipeline (30) and is located on the side of the exhaust valve (1) away from the liquid inlet pipe (11).

7. The sampling and testing apparatus according to claim 1, characterized in that, The liquid inlet pipe (11) and the scale (12) are integrally formed.

8. The sampling test apparatus according to any one of claims 1-7, characterized in that, The sampling test device also includes a waste liquid storage tank (40), which is located downstream of the sampling component and is used to store waste liquid.

9. A test method applicable to the sampling test apparatus as described in any one of claims 1-8, characterized in that, The experimental method includes the following steps: S1: Connect the inlet pipe (11) to the exhaust valve (1) at the end of the sampling pipe (30); S2: Inject the test liquid into the inlet pipe (11) until the height indicated by the scale (12) reaches the preset height value; S3: Activate the vacuum structure and continuously inject the test liquid into the inlet pipe (11), and ensure that the height of the test liquid in the inlet pipe (11) is maintained at the preset height value; S4: Observe whether the real-time flow value of the flow meter (23) meets the sampling requirements. The flow meter (23) can monitor the flow rate of the test liquid in the sampling pipeline (30) in real time. The flow rate can be used to determine whether the sampling requirements are met, and can indicate whether the function of the sampling system can be realized.

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