Device for measuring content of dissolved hydrogen in pressurized water reactor primary loop coolant

Abstract

The utility model discloses a device for measuring the content of dissolved hydrogen in a pressurized water reactor primary loop coolant, which comprises a cabinet, the cabinet is provided with a measuring chamber, and a hydrogen analyzer is arranged in the measuring chamber; each hydrogen analyzer is connected with a sample feeding pipeline and a sample discharging pipeline; the first end of the sample introduction pipeline penetrates through the cabinet, the second end of the sample introduction pipeline is connected with an inlet of the hydrogen analyzer, and the part, located in the cabinet, of the sample introduction pipeline is provided with a first adjusting valve, a first pressure gauge and a flow meter; the first end of the sample outlet pipeline penetrates through the cabinet, the second end of the sample outlet pipeline is connected with an outlet of the hydrogen analyzer, and at least one second pressure gauge is arranged at the part, located in the cabinet, of the sample outlet pipeline. The device for measuring the content of dissolved hydrogen in the pressurized water reactor primary loop coolant is provided with the first regulating valve, the first pressure gauge, the flowmeter and the second pressure gauge, so that the sample water flow and the measurement back pressure of the hydrogen analyzer can be read and regulated, and the measurement accuracy of the hydrogen analyzer is improved. A sample outlet pipeline is arranged, so that radioactive samples can be recycled.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a device for measuring the dissolved hydrogen content in the primary coolant of a pressurized water reactor. Background Technology

[0002] According to the technical specifications for water chemistry in nuclear power plants, the dissolved hydrogen content in the primary coolant must be controlled within a certain range during pressurized water reactor operation. In both power operation and cold shutdown modes, a suitable hydrogen content effectively inhibits the irradiation decomposition of the primary coolant, prevents hydrogen embrittlement of the zirconium alloy in the nuclear fuel, and protects the pressure boundary materials of the primary coolant from corrosion. Accurate measurement of the dissolved hydrogen concentration in the reactor's primary coolant is a prerequisite and necessary condition for tracking and adjusting the hydrogen concentration, and is closely related to the safe operation of the nuclear power plant.

[0003] Methods for measuring dissolved hydrogen in the primary loop of a pressurized water reactor include using a hydrogen analyzer. However, hydrogen analyzers are typically standalone devices, requiring on-site connection of pipelines to the sampling system. They lack adjustable valves and flow meters, making it difficult to quickly and accurately control the flow rate, thus affecting the accuracy of the measurement results. Furthermore, the back pressure of the sample water in the portable hydrogen analyzer cannot be monitored, and the pressure cannot be quickly and accurately controlled, further impacting the accuracy of the measurement results. When using a hydrogen analyzer, the reactor primary loop coolant sample water flowing through it is directly discharged into the air and then treated as chemical wastewater, thus failing to achieve direct recovery and reuse of the primary loop coolant. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device for measuring the dissolved hydrogen content in the primary coolant of a pressurized water reactor.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a device for measuring the dissolved hydrogen content in the primary coolant of a pressurized water reactor, including a cabinet, wherein the cabinet is provided with a measuring chamber, and at least one hydrogen analyzer is provided in the measuring chamber; each hydrogen analyzer is connected to an inlet pipe and an outlet pipe;

[0006] The first end of the sample inlet pipe passes through the cabinet, and the second end of the sample inlet pipe is connected to the inlet of the hydrogen analyzer. The portion of the sample inlet pipe located in the cabinet is equipped with at least one first regulating valve, at least one first pressure gauge, and at least one flow meter. The first end of the sample outlet pipe passes through the cabinet, and the second end of the sample outlet pipe is connected to the outlet of the hydrogen analyzer. The portion of the sample outlet pipe located in the cabinet is equipped with at least one second pressure gauge.

[0007] In some embodiments, the first end of the sample inlet line is provided with a first quick connector;

[0008] The first end of the sample outlet pipeline is equipped with a second quick connector.

[0009] In some embodiments, the dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor further includes a nitrogen supply pipeline;

[0010] The nitrogen supply pipeline includes a main nitrogen supply pipeline and several branch nitrogen supply pipelines. The branch nitrogen supply pipelines are installed in the measurement chamber for corresponding connection with the hydrogen analyzer. The first end of the main nitrogen supply pipeline passes through the cabinet, and the second end of the main nitrogen supply pipeline is connected to the branch nitrogen supply pipelines.

[0011] In some embodiments, each of the nitrogen supply branch lines is provided with at least one second regulating valve and at least one third pressure gauge.

[0012] In some embodiments, the first end of the nitrogen supply main pipeline is provided with a third quick connector.

[0013] In some embodiments, the cabinet includes two side panels disposed opposite each other and a rear side panel connecting the two side panels, the two side panels and the rear side panel defining the measurement chamber;

[0014] The cabinet also includes a protective cover, which is L-shaped and includes a first plate and a second plate that are vertically connected. The first plate is rotatably connected to the upper edge of the rear side plate, and the first plate and / or the second plate are provided with a viewing window.

[0015] In some embodiments, the dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor further includes a support rod, the two ends of which are respectively connected to the first plate and the side plate.

[0016] In some embodiments, the outer side of the cabinet is also provided with a cable storage container.

[0017] In some embodiments, the cabinet further includes a tool storage compartment located below the measurement compartment and separated from the measurement compartment.

[0018] In some embodiments, the bottom of the cabinet is provided with a movable component.

[0019] The present invention offers the following advantages: The dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor, by incorporating a first regulating valve, a first pressure gauge, a flow meter, and a second pressure gauge, allows for the reading and adjustment of the sample water flow rate and measurement back pressure of the hydrogen analyzer, thereby improving the measurement accuracy of the hydrogen analyzer. Furthermore, the inclusion of a sample outlet pipeline enables the recovery of radioactive samples. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the present utility model 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 this utility model 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 one of the structural schematic diagrams of the dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor in some embodiments of this utility model;

[0022] Figure 2 This is the second detailed schematic diagram of the device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor in some embodiments of this utility model;

[0023] Figure 3 This is the third schematic diagram of the structure of the dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor in some embodiments of this utility model;

[0024] Figure 4 This is the fourth schematic diagram of the structure of the dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor in some embodiments of this utility model;

[0025] Figure 5 This is a partial structural schematic diagram of the device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor in some embodiments of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the sample and gas-liquid phase separator glove box of the primary loop of the nuclear sampling system in some embodiments of this utility model. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model 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 component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0028] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "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 utility model can be understood according to the specific circumstances.

[0029] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0030] See Figures 1 to 5 This utility model discloses a device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor, which includes a cabinet 10. The cabinet 10 can be a generally square columnar structure, for example, a generally rectangular columnar structure. The cabinet 10 can be made of a metal material, such as stainless steel.

[0031] The cabinet 10 includes a measurement chamber A and a tool storage chamber B located below and separated from the measurement chamber A. The cabinet 10 may include two opposite side panels 11 and a rear side panel 12 connecting the two side panels 11. The two side panels 11 and the rear side panel 12 define the measurement chamber A. The two side panels 11 may include a left side panel and a right side panel. The cabinet 10 also includes a connecting panel between the two side panels. The cabinet 10 includes a bottom plate and a partition, with the partition located above the bottom plate. The partition defines the inner cavity of the cabinet 10 into an upper measuring chamber A and a lower tool storage chamber B. The measuring chamber A is used to place measuring instruments, and the tool storage chamber B is used to store tools (e.g., spare parts and maintenance tools for the hydrogen analyzer 20). The tool storage chamber B has a door panel that can be connected to the side plate 11. The door panel may have a handle and / or a lock.

[0032] Of course, in some embodiments, the tool storage chamber B may not be provided, and the two side plates 11, the rear side plate 12, and the bottom plate together define the measuring chamber A. Preferably, the bottom of the measuring chamber A may also be provided with a leak-proof baffle to prevent the spread of pollution. Alternatively, the bottom of the measuring chamber A may be provided with a storage tank or storage container, and the hydrogen analyzer 20 is placed in the storage tank or storage container. When the sample water leaks, it can be collected in the storage tank or storage container, preventing leakage and spread.

[0033] In some embodiments, the cabinet 10 further includes a protective cover 13, which is L-shaped and includes a first plate 131 and a second plate 132 connected vertically. The first plate 131 is rotatably connected to the upper edge of the rear side panel 12, for example, by a hinge, a pivot, or a rotating shaft. When the protective cover 13 is in the closed state, the first plate 131 is disposed opposite to the bottom plate or partition, and the second plate 132 is disposed opposite to the rear side panel 12.

[0034] The first plate 131 and / or the second plate 132 are provided with viewing windows. For example, the first plate 131 is provided with a first viewing window 1311, or the second plate 132 is provided with a second viewing window 1321, or the first plate 131 is provided with a first viewing window 1311 and the second plate 132 is provided with a second viewing window 1321. The settings can be selected according to actual needs. Staff can observe the instruments and equipment in the measurement room A through the viewing windows.

[0035] like Figures 1 to 2 As shown, in some embodiments, a handle 1322 may be provided on the outer side of the second plate 132, which facilitates the opening or closing of the protective cover 13 by the staff.

[0036] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor further includes a support rod 14, the two ends of which are respectively connected to the first plate 131 and the side plate 11. The support rod 14 includes, but is not limited to, a hydraulic rod or a pneumatic rod, and can be used to assist in supporting the protective cover 13, so that the protective cover 13 remains in the open state.

[0037] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the measurement chamber A is equipped with at least one hydrogen analyzer 20, for example, two hydrogen analyzers 20. Of course, the number and installation location of the hydrogen analyzers 20 can be selected according to actual needs, and no specific limitation is made here. The hydrogen analyzer 20 can be, but is not limited to, a portable hydrogen analyzer. The hydrogen analyzer 20 and related pipelines are housed in the cabinet 10. When the hydrogen analyzer is connected to the primary loop system for measurement, the primary loop coolant flowing through the hydrogen analyzer 20 is pressurized. Even if the instrument is placed in the external environment, it will not leak into the environment even if there is a splash of radioactive liquid, effectively reducing the risk of personnel contamination.

[0038] like Figure 2 , Figure 3 and Figure 5 As shown, each of the hydrogen analyzers 20 is further connected to an inlet pipe 30 and an outlet pipe 40. The first end of the inlet pipe 30 passes through the cabinet 10, for example, the first end of the inlet pipe 30 passes through the rear panel 12 of the cabinet 10.

[0039] The second end of the sample inlet line 30 is connected to the inlet of the hydrogen analyzer 20. The portion of the sample inlet line 30 located in the cabinet 10 is equipped with at least one first regulating valve 31, at least one first pressure gauge 32, and at least one flow meter 33. The first regulating valve 31 may be, but is not limited to, a needle valve, and can be used to regulate the sample flow rate, etc. The flow meter 33 has a range of 0–40 L / h.

[0040] like Figure 2 , Figure 3 and Figure 5 As shown, the first end of the sample outlet pipe 40 passes through the cabinet 10, for example, the first end of the sample outlet pipe 40 passes through the rear side panel 12 of the cabinet 10. The first end of the sample outlet pipe 40 is connected to the system return water line to realize sample water recovery.

[0041] like Figure 2 , Figure 3 and Figure 5As shown, the second end of the sample outlet pipeline 40 is connected to the outlet of the hydrogen analyzer 20. The portion of the sample outlet pipeline 40 located in the cabinet 10 is equipped with at least one second pressure gauge 41, with a range of 0–1.0 MPa. Furthermore, the sample outlet pipeline 40 may also be equipped with a control valve or pressure regulating valve to adjust the sample water flow rate, velocity, and water pressure downstream of the hydrogen analyzer 20. The control valve includes, but is not limited to, a needle valve.

[0042] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the first end of the sample inlet line 30 is provided with a first quick connector 34, and the first end of the sample outlet line 40 is provided with a second quick connector 42. Quick plug-in connection can be achieved by configuring quick connectors.

[0043] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor further includes a nitrogen supply pipeline 50. The nitrogen supply pipeline 50 includes a main nitrogen supply pipeline 51 and several branch nitrogen supply pipelines 52. The branch nitrogen supply pipelines 52 are installed in the measuring chamber A for corresponding connection with the hydrogen analyzer 20. The first end of the main nitrogen supply pipeline 51 passes through the cabinet 10, for example, through the rear panel 12 of the cabinet 10, to connect with the nuclear power plant's nitrogen supply system and continuously supply gas to the hydrogen analyzer 20. The first end of the main nitrogen supply pipeline 51 is provided with a third quick connector 511 for quick connection with the nuclear power plant's nitrogen supply system connector.

[0044] like Figure 2 , Figure 3 and Figure 5 As shown, when there are two nitrogen supply branch lines 52, the second end of the main nitrogen supply line 51 can be connected to the first valve port of the three-way valve 512, and the two nitrogen supply branch lines 52 are respectively connected to the second and third valve ports of the three-way valve 512. Of course, the three-way valve 512 may not be provided, and no specific limitation is made here.

[0045] The second end of the main nitrogen supply line 51 is connected to the nitrogen supply branch line 52, which is used to connect to the hydrogen sensor of the hydrogen analyzer 20. Figure 3 As shown, the end of the nitrogen supply branch line 52 may be provided with an interface 523, which can be connected to the hydrogen sensor of the hydrogen analyzer 20 through a connecting pipe (such as a flexible hose).

[0046] like Figure 2 , Figure 3 and Figure 5As shown, each nitrogen supply branch line 52 is equipped with at least one second regulating valve 521 and at least one third pressure gauge 522. The second regulating valve 521 can be used for pressure regulation and reduction. Generally, the nitrogen inlet pressure is 2.0 MPa, while the range of the hydrogen analyzer 20 is 0–0.1 MPa, requiring appropriate pressure reduction. The second regulating valve 521 can also be used for opening or closing; for example, when a nitrogen supply branch line 52 is not supplying gas, the second regulating valve 521 can be closed. The third pressure gauge 522 can be used to monitor the gas supply pressure.

[0047] In some embodiments, the outer side of the cabinet 10 is also provided with a pipeline storage container 60, which can be disposed on the rear side panel 12. The pipeline storage container 60 can be used to store the sample inlet pipeline 30, sample outlet pipeline 40, and nitrogen supply main pipeline 51 located outside the cabinet 10. The sample inlet pipeline 30, sample outlet pipeline 40, and nitrogen supply main pipeline 51 can all be metal flexible hoses, such as metal corrugated pipes.

[0048] In some embodiments, the bottom of the cabinet 10 is provided with a movable component 70 to facilitate the movement of the dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor. The movable component 70 may include a number of casters, including but not limited to casters or casters.

[0049] like Figure 2 As shown, in some embodiments, the cabinet 10 may also be provided with several waterproof interfaces 80, which may be located on the side panel 11. These waterproof interfaces 80 can be used to connect to the hydrogen analyzer 20. Through a channel converter, each waterproof interface 80 can function as a single interface, simultaneously providing power supply and signal transmission, allowing for flexible switching of usage modes according to the unit's operating conditions. Of course, in some embodiments, the waterproof interface 80 may not be provided; this is not specifically limited here.

[0050] The sampling method was optimized based on the original design of the nuclear sampling system. A simplified flow chart of the primary loop sample and analyzer chamber is shown below. Figure 6 As shown. Sample water from different locations in the reactor primary loop can be diverted from the analyzer chamber via a 7363WV to the dissolved hydrogen content measuring device in the primary loop coolant of the pressurized water reactor. The first end of the sample inlet pipe 30 is connected to the 7363WV, and the first end of the sample outlet pipe 40 is connected to the 7362WV. After the sample water flows through the hydrogen analyzer 20 (such as a portable hydrogen analyzer), it returns to the primary loop sample recovery tank via the 7362WV. The flow rate is regulated by the first regulating valve 31, and the back pressure is monitored by the first pressure gauge 32 and the second pressure gauge 41.

[0051] Nitrogen is supplied by the SGN nitrogen system via 7228WV and 7228VZ, and the outlet pressure of the second regulating valve 521 can be controlled at 40–60 kPa. The sample water return capacity control tank allows for the recycling of the reactor's primary coolant, preventing waste. The SGN system provides a continuous nitrogen supply, eliminating the cumbersome operation of periodically priming the hydrogen analyzer's cylinders via an external high-pressure nitrogen cylinder.

[0052] Understandably, this device for measuring the dissolved hydrogen content in the primary coolant of a pressurized water reactor has the following beneficial effects:

[0053] (1) Before the sample is injected, open the protective cover 13 and confirm that there are no leaks in the pipeline, connectors, hydrogen analyzer 20, etc. Adjust the sample water flow rate and pressure, then lower the protective cover 13 and continue to measure. The protective cover 13 has a transparent window, so the reading can be taken without opening the protective cover 13.

[0054] (2) The sample water flow rate and pressure are adjustable and monitored. Based on experience, the sample water flow rate and measurement back pressure have a significant impact on the dissolved hydrogen measurement results. By setting the first regulating valve 31, the first pressure gauge 32, the flow meter 33, and the second pressure gauge 41, the sample water flow rate and measurement back pressure of the hydrogen analyzer 20 can be read and adjusted. In actual use, the sample water flow rate and measurement back pressure can be controlled within the optimal range, thereby improving the measurement accuracy of the hydrogen analyzer 20.

[0055] (3) Optimization of purging nitrogen supply method. Based on the working principle of the hydrogen analyzer 20, a new nitrogen supply system is set up with a nitrogen supply pipeline 50 connected to the nitrogen system of the nuclear power plant, equipped with a second regulating valve 521 and a third pressure gauge 522. This system can replace the original hydrogen analyzer's built-in purging gas cylinder. This avoids the cumbersome operation of periodically filling the hydrogen analyzer cylinder with an external high-pressure nitrogen cylinder (>200 bar) and eliminates the safety risks associated with the use of high-pressure nitrogen.

[0056] (4) A sample outlet pipeline 40 is installed to enable the recovery of radioactive samples. Typically, hydrogen analyzers operate offline, making sample water unrecoverable. Since the primary coolant in nuclear power plants contains radioactivity, prolonged hydrogen analysis generates large amounts of radioactive waste liquid, increasing waste treatment costs and causing primary coolant loss. This pressurized water reactor primary coolant dissolved hydrogen content measuring device, with its sample outlet pipeline 40 installed according to the primary sampling system's process structure, allows for the recovery and reuse of sample water.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A device for measuring the dissolved hydrogen content in the primary coolant of a pressurized water reactor, characterized in that, Includes a cabinet (10), the cabinet (10) is provided with a measurement chamber (A), the measurement chamber (A) is provided with at least one hydrogen analyzer (20); each hydrogen analyzer (20) is connected to an inlet pipe (30) and an outlet pipe (40); The first end of the sample inlet pipe (30) passes through the cabinet (10), and the second end of the sample inlet pipe (30) is connected to the inlet of the hydrogen analyzer (20). The portion of the sample inlet pipe (30) located in the cabinet (10) is equipped with at least one first regulating valve (31), at least one first pressure gauge (32), and at least one flow meter (33). The first end of the sample outlet pipe (40) passes through the cabinet (10), and the second end of the sample outlet pipe (40) is connected to the outlet of the hydrogen analyzer (20). The portion of the sample outlet pipe (40) located in the cabinet (10) is equipped with at least one second pressure gauge (41).

2. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The first end of the sample inlet line (30) is provided with a first quick connector (34); The first end of the sample outlet pipeline (40) is provided with a second quick connector (42).

3. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The device for measuring dissolved hydrogen content in the primary coolant of the pressurized water reactor also includes a nitrogen supply pipeline (50); The nitrogen supply pipeline (50) includes a main nitrogen supply pipeline (51) and several nitrogen supply branch pipelines (52). The nitrogen supply branch pipelines (52) are installed in the measurement chamber (A) for corresponding connection with the hydrogen analyzer (20). The first end of the main nitrogen supply pipeline (51) passes through the cabinet (10), and the second end of the main nitrogen supply pipeline (51) is connected to the nitrogen supply branch pipelines (52).

4. The dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor according to claim 3, characterized in that, Each of the nitrogen supply branch lines (52) is provided with at least one second regulating valve (521) and at least one third pressure gauge (522).

5. The dissolved hydrogen content measuring device in the primary coolant of a pressurized water reactor according to claim 4, characterized in that, The first end of the nitrogen supply main pipeline (51) is provided with a third quick connector (511).

6. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The cabinet (10) includes two side panels (11) arranged opposite to each other and a rear side panel (12) connecting the two side panels (11), the two side panels (11) and the rear side panel (12) defining the measurement chamber (A); The cabinet (10) also includes a protective cover (13), which is L-shaped and includes a first plate (131) and a second plate (132) connected vertically. The first plate (131) is rotatably connected to the upper edge of the rear side plate (12), and the first plate (131) and / or the second plate (132) are provided with windows.

7. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 6, characterized in that, The dissolved hydrogen content measuring device in the primary coolant of the pressurized water reactor also includes a support rod (14), the two ends of which are connected to the first plate (131) and the side plate (11), respectively.

8. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The outer side of the cabinet (10) is also provided with a pipeline storage container (60).

9. The device for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The cabinet (10) also includes a tool storage compartment (B), which is located below the measuring chamber (A) and is separated from the measuring chamber (A).

10. The apparatus for measuring dissolved hydrogen content in the primary coolant of a pressurized water reactor according to claim 1, characterized in that, The bottom of the cabinet (10) is provided with a movable component (70).

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