Nuclear power plant primary loop water pressure test sampling device and method

Abstract

The application is suitable for the field of liquid sampling test, and discloses a nuclear power plant primary loop water pressure test sampling device and method, which comprises a water supply unit, a water supply sampling unit, a clamping unit and a sample loading unit; the water supply unit supplies liquid into the water supply sampling unit; the clamping unit is arranged on an evaporator, and the clamping unit is provided with a through hole penetrating through the side wall of the evaporator; the water supply sampling unit comprises a water inlet valve, a water outlet valve, a flow meter and a water pump, the flow meter is connected with the clamping unit through a pipeline, and the pipeline penetrates through the side wall of the evaporator and extends into the evaporator; the water supply unit, the water inlet valve, the flow meter and the clamping unit are connected through the pipeline to form a first water circuit, the first water circuit is used for supplying water into the evaporator, and the clamping unit, the flow meter, the water pump and the water outlet valve are connected through the pipeline to form a second water circuit, the second water circuit is used for extracting liquid in the evaporator into the sample loading unit.

Description

Technical Field

[0001] This invention relates to the field of liquid sampling and testing, and more particularly to a sampling device and method for primary loop hydraulic pressure testing in nuclear power plants. Background Technology

[0002] Nuclear reactor units typically have a primary loop and a secondary loop. The liquid in the primary loop is in direct contact with the reactor and generally contains high levels of radiation. The secondary loop is located inside the evaporator and exchanges heat with the primary loop liquid through an external supply of purified water. During the primary loop hydrostatic test, the secondary loop of the evaporator must be filled with water according to RSE-M specifications. Then, water from the secondary loop is extracted for radiation testing to check for any leaks in the primary loop caused by the hydrostatic test.

[0003] Currently, the common practice is to cut open the drain pipe of the APG system in the evaporator and install water sampling equipment for water sampling and testing. However, since this area is a high-radiation-dose area, personnel have to enter and exit the high-radiation-dose area of ​​the control zone several times during the test to carry out secondary circuit water filling, sampling, drainage and sample delivery. This results in high labor costs, a large collective radiation dose, and the removal of the water intake and intake device, pipe weld restoration and radiographic inspection after the water pressure test. This is extremely time-consuming and hinders other projects, leading to an extension of the overall project duration. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sampling device and method for primary circuit hydrostatic testing in nuclear power plants, which aims to solve the problems in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem includes: a water supply unit, a water supply sampling unit, a clamping unit, and a sample loading unit; the water supply unit supplies liquid to the water supply sampling unit; the clamping unit is disposed on the evaporator, and the clamping unit has a through hole penetrating the side wall of the evaporator; the water supply sampling unit includes an inlet valve, an outlet valve, a flow meter, and a water pump, the flow meter is connected to the clamping unit through a pipe, the pipe passes through the side wall of the evaporator and extends into the evaporator; the water supply unit, the inlet valve, the flow meter, and the clamping unit are connected through a pipe to form a first water path, the first water path being used to supply water to the evaporator; the clamping unit, the flow meter, the water pump, and the outlet valve are connected through a pipe to form a second water path, the second water path being used to extract liquid from the evaporator into the sample loading unit.

[0006] In one embodiment, the clamping unit includes a base and a sealing member. The base is disposed at the through hole, and the sealing member is detachably connected to the base. The sealing member is used to seal the through hole.

[0007] In one embodiment, the sealing member is bolted to the base, and a sealing gasket is provided between the sealing member and the base.

[0008] In one embodiment, the sample clamping unit includes an inner sampling bucket and an outer bucket, the inner sampling bucket being connected to the water outlet valve, and the inner sampling bucket being disposed inside the outer bucket.

[0009] In one embodiment, the water pump is a manual water pump.

[0010] In one embodiment, the first water path and the second water path share the pipe through which the flow meter is connected to the clamping unit.

[0011] In one embodiment, the water supply unit is positioned higher than the inlet valve, flow meter, and clamping unit, and the water supply unit supplies water to the inlet valve by means of gravitational potential energy.

[0012] This invention also discloses a sampling method for primary loop hydraulic pressure testing in nuclear power plants, comprising the following steps:

[0013] Step S1: Open the water inlet valve, and the water supplied by the water supply unit flows through the water inlet valve, flow meter, and clamping unit, and finally flows into the evaporator;

[0014] Step S2: After observing that the flow meter has reached the specified inlet water volume, close the inlet valve;

[0015] Step S3: Start the water pump and open the drain valve. The liquid in the evaporator flows through the flow meter, the water pump and the drain valve, and finally flows into the sample loading unit.

[0016] Step S4: After observing that the flow meter has reached the specified water output, close the water outlet valve, remove the sample loading unit, and complete the sampling.

[0017] In one embodiment, before step S1, the clamping unit needs to be opened to expose the through hole and the connection to the pipe.

[0018] In one implementation, if the water output exceeds the capacity of the sample loading unit, the water outlet valve must be shut off immediately.

[0019] The present invention has the following advantages: a clamping unit is installed on the side wall of the evaporator, and the clamping unit has a hole in the side wall of the evaporator, which can be directly connected to the inside of the evaporator through a hose. The water supply sampling unit can perform remote filling, water discharge and sampling. Users can reduce the number of times they enter and exit high radiation dose areas. Since it is not necessary to cut the evaporator drain pipe every time, the time for welding repair and radiographic testing of the evaporator drain pipe is reduced, which greatly improves the efficiency of the project. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0021] Figure 1 This is an overall diagram of a sampling device for a primary loop hydrostatic test in a nuclear power plant, according to one embodiment of the present invention.

[0022] Figure 2 This is a front view of the clamping unit of the sampling device for the primary loop hydrostatic test of a nuclear power plant in one embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the clamping unit of the sampling device for the primary loop hydrostatic test of a nuclear power plant in one embodiment of the present invention;

[0024] Figure 4 This is a flowchart of a sampling method for a primary loop hydraulic test in a nuclear power plant, according to one embodiment of the present invention.

[0025] Attached Figure Captions

[0026] 100. Water supply unit; 110. Evaporator; 200. Water supply sampling unit; 210. Inlet valve; 220. Outlet valve; 230. Water pump; 240. Flow meter; 300. Clamping unit; 310. Through hole; 320. Bolt; 330. Base; 340. Sealing component; 350. Sealing gasket; 400. Inner sampling tank; 410. Outer tank. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0028] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0029] Figures 1 to 3 This invention illustrates a sampling device for primary circuit hydraulic pressure testing in a nuclear power plant, according to one embodiment of the present invention. This device can be used for sampling and investigation of hydraulic pressure tests within an evaporator 110 of a nuclear power plant. It may include a water supply unit 100, a water supply sampling unit 200, a clamping unit 300, and a sample loading unit. The water supply unit 100 supplies liquid to the water supply sampling unit 200. The clamping unit 300 is mounted on the evaporator 110 and has a through hole 310 penetrating the side wall of the evaporator 110. The water supply sampling unit 200 includes an inlet valve 210, an outlet valve 220, a flow meter 240, and a pump 230. The flow meter 240 is connected to the clamping unit 300 via a pipe that passes through the side wall of the evaporator 110 and extends into the evaporator 110. The water supply unit 100, inlet valve 210, flow meter 240, and pump 230 are also described. The flow meter 240 and the clamping unit 300 are connected by a pipe to form a first water path, which is used to supply water to the evaporator 110. The clamping unit 300, the flow meter 240, the water pump 230 and the outlet valve 220 are connected by a pipe to form a second water path, which is used to extract liquid from the evaporator 110 into the sample loading unit. The clamping unit 300 is installed on the side wall of the evaporator 110. The clamping unit 300 has an opening in the side wall of the evaporator 110 and can be directly connected to the inside of the evaporator 110 through a hose. The water supply and sampling unit 200 can perform remote filling, water discharge and sampling. Users will find that this reduces the number of times they enter and exit high radiation dose areas. Since it is not necessary to damage the drain pipe of the evaporator 110 every time, the time for welding repair and radiographic testing of the drain pipe of the evaporator 110 is reduced, which greatly improves the efficiency of the project.

[0030] It is understandable that the evaporator 110 is located in an environment with high temperature, humidity and radiation, which is not suitable for engineers to stay in for a long time. Therefore, the pipe length between the clamping unit 300 and the flow meter 240 is relatively long, which can be extended to an area with a relatively good working environment for sampling.

[0031] In one specific embodiment, the flow meter 240 is a non-contact flow meter 240. The non-contact flow meter 240 can detect the flow rate without direct contact with the liquid, thus avoiding damage to the flow meter 240 from high-temperature and high-radiation liquids.

[0032] In one specific embodiment, the flow meter 240 is an ultrasonic flow meter 240. It is only necessary to attach the ultrasonic flow meter 240 to the pipeline for detection, which is simple to operate and has high accuracy.

[0033] In one specific embodiment, the flow meter 240 is a mechanical flow meter 240, because it does not contain corresponding electronic components and can still work normally in high radiation and high temperature working environments.

[0034] In one specific embodiment, the inlet valve 210, the outlet valve 220, the flow meter 240, and the water pump 230 are integrated into one device.

[0035] In one specific embodiment, the sample loading unit is equipped with a radiation detection device. When the sample loading unit is filled with a radioactive liquid, the radiation detection device automatically detects the radiation content of the liquid.

[0036] Figure 1 and Figure 3 The clamping unit 300, as shown in one embodiment, may include a base 330 and a sealing member 340. The base 330 is disposed at the through hole 310, and the sealing member 340 is detachably connected to the base 330. The sealing member 340 is used to block the through hole 310. When sampling is required, the sealing member 340 is opened, and the pipe enters the evaporator 110 through the through hole 310. When sampling is not required, the pipe is removed from the through hole 310, and the sealing member 340 is put back into the through hole 310.

[0037] In a specific embodiment, the base 330 is welded onto the evaporator 110.

[0038] Figure 1 and Figure 3 The clamping unit 300 is shown in one embodiment to include a plug 340 connected to a base 330 by bolts 320, and a sealing gasket 350 is provided between the plug 340 and the base 330 to prevent leakage between the plug 340 and the base 330.

[0039] In one specific embodiment, the sealing element 340 is a cover plate made of non-transparent material, which is fixed to the base 330 by bolts 320. Transparent items are not allowed to be brought into the nuclear power facility.

[0040] Figure 1 The sample clamping unit shown in one embodiment may include an inner sampling container 400 and an outer container 410. The inner sampling container 400 is connected to a water outlet valve 220 and is disposed inside the outer container 410. The inner sampling container 400 is used to hold the sampled liquid, and the outer container 410 is used to prevent spilled liquid from flowing onto the ground.

[0041] Understandably, the shape of the sampling inner container 400 depends on actual needs and design requirements, and can be a normal beaker shape, bottle shape, etc.

[0042] Figure 1 The water pump 230 is shown in one embodiment and may be a manual water pump 230. The manual water pump 230 can be used to pump water manually. When the water volume is less than 10 liters, using the manual water pump 230 can save on the power supply requirements and reduce the total cost. In addition, the manual water pump 230 can be stopped at any time, which is simpler to operate and more controllable than the electric water pump 230.

[0043] Figure 1 The loading unit 330 is shown in one embodiment to include a pipe connecting the first water path and the second water path to the clamping unit 300 via a shared flow meter 240.

[0044] Figure 1 The loading unit 330 is shown in one embodiment to include a water supply unit 100 positioned above the inlet valve 210, the flow meter 240 and the clamping unit 300, with the water supply unit 100 supplying water to the inlet valve 210 by means of gravitational potential energy.

[0045] Figure 4 This invention illustrates a sampling method for a primary loop hydraulic test in a nuclear power plant, which may include:

[0046] Step S1: Open the inlet valve 210. The water supplied by the water supply unit 100 flows through the inlet valve 210, the flow meter 240, the clamping unit 300, and finally flows into the evaporator 110.

[0047] Step S2: After observing that the flow meter 240 has reached the specified inlet water volume, close the inlet valve 210;

[0048] Step S3: Start the water pump 230, open the drain valve, and the liquid in the evaporator 110 flows through the flow meter 240, the water pump 230 and the drain valve, and finally flows into the sample loading unit.

[0049] Step S4: After the flow meter 240 reaches the specified outflow rate, close the outlet valve 220, remove the sample loading unit, and complete the sampling.

[0050] Figure 2 and Figure 3 In one embodiment, step S1 may include opening the clamping unit 300 before step S1 to expose the through hole 310 for connection with the pipe.

[0051] Figure 4 In one embodiment, step S4 may include immediately closing the water outlet valve 220 if the water output exceeds the capacity of the sample loading unit to prevent water from overflowing onto the ground and causing radiation pollution.

[0052] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A sampling device for hydrostatic testing of the primary loop of a nuclear power plant, wherein the primary loop of the nuclear power plant includes an evaporator (110), characterized in that, include: Water supply unit (100), water supply sampling unit (200), clamping unit (300) and sample loading unit; The water supply unit (100) supplies liquid into the water supply sampling unit (200); The clamping unit (300) is disposed on the evaporator (110), and the clamping unit (300) is provided with a through hole (310) penetrating the side wall of the evaporator (110); The water supply sampling unit (200) includes an inlet valve (210), an outlet valve (220), a flow meter (240), and a pump (230). The flow meter (240) is connected to the clamping unit (300) via a pipe, which passes through the side wall of the evaporator (110) and extends into the evaporator (110). The water supply unit (100), the inlet valve (210), the flow meter (240), and the clamping unit (300) are connected by a pipe to form a first water path, which is used to supply water to the evaporator (110). The clamping unit (300), the flow meter (240), the pump (230), and the outlet valve (220) are connected by a pipe to form a second water path, which is used to extract liquid from the evaporator (110) into the loading sample unit.

2. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 1, characterized in that, The clamping unit (300) includes a base (330) and a sealing member (340). The base (330) is disposed at the through hole (310). The sealing member (340) is detachably connected to the base (330) and is used to seal the through hole (310).

3. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 2, characterized in that, The sealing element (340) is connected to the base (330) by bolts (320), and a sealing gasket (350) is provided between the sealing element (340) and the base (330).

4. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 1, characterized in that, The sample clamping unit includes an inner sampling bucket (400) and an outer bucket (410). The inner sampling bucket (400) is connected to the water outlet valve (220), and the inner sampling bucket (400) is disposed inside the outer bucket (410).

5. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 1, characterized in that, The water pump (230) is a manual water pump (230).

6. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 1, characterized in that, The first water path and the second water path share the same flow meter (240) and the pipe connecting the clamping unit (300).

7. The sampling device for primary loop hydrostatic testing in a nuclear power plant according to claim 1, characterized in that, The water supply unit (100) is positioned higher than the inlet valve (210), flow meter (240) and clamping unit (300), and the water supply unit (100) supplies water to the inlet valve (210) by means of gravitational potential energy.

8. A sampling method for primary circuit hydrostatic testing in a nuclear power plant, applied to the sampling device for primary circuit hydrostatic testing in a nuclear power plant as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Open the water inlet valve (210), and the water supplied by the water supply unit (100) flows through the water inlet valve (210), flow meter (240), clamping unit (300), and finally flows into the evaporator (110); Step S2: After observing that the flow meter (240) has reached the specified inlet water volume, close the inlet valve (210); Step S3: Start the water pump (230), open the outlet valve (220), and the liquid in the evaporator (110) flows through the flow meter (240), the water pump (230) and the outlet valve (220) and finally flows into the sample loading unit; Step S4: After observing that the flow meter (240) has reached the specified water output, close the water outlet valve (220), remove the sample loading unit, and complete the sampling.

9. The sampling method for primary loop hydraulic test in a nuclear power plant according to claim 8, characterized in that, Before step S1, the clamping unit (300) needs to be opened to expose the through hole (310) and the connection with the pipe.

10. The sampling method for primary loop hydrostatic testing in a nuclear power plant according to claim 8, characterized in that, In step S4, if the water output exceeds the capacity of the sample loading unit, the water outlet valve (220) must be closed immediately.

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