External physical decontamination device for nuclear reactor

Abstract

The utility model relates to an external physical decontamination device for a nuclear reactor, in particular to an external physical decontamination device for a nuclear reactor, which comprises a box body, a hoisting opening is arranged at the upper end of the box body, a partition plate is fixedly connected to the inner side of the box body, a pipeline mounting layer is arranged at the lower end of the partition plate on the inner side of the box body, and a pipeline is arranged in the pipeline mounting layer. An inlet valve is mounted in the pipeline mounting layer, a circulating pump is mounted at one end of the inlet valve, a connecting pipeline is fixedly connected to one end of the circulating pump, a pump outlet valve is fixedly connected to one end of the connecting pipeline, and a buffer tank is fixedly connected to the outer side of the connecting pipeline; a circulating pump is used for driving a coolant of a primary loop system of a reactor to sequentially pass through a filter for circulating series washing, suspended activated corrosion products in the coolant and loose activated corrosion products adhered to the inner wall of the primary loop system are filtered out, and the radiation level in a reactor building and the irradiation dose of in-service inspection, maintenance and refueling workers are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of external physical decontamination devices for nuclear reactors, in particular to an external physical decontamination device for nuclear reactors. Background Art

[0002] At present, most of my country's nuclear reactors are pressurized water reactors, using deionized water as coolant. Most of the equipment, pipelines, and valves in the reactor's primary loop system are metal products. Under the long-term erosion and scouring of the reactor's high-temperature, high-pressure cooling water, the inner surfaces of the equipment, pipelines, and valves in the primary loop system have some peeling to form corrosion products, which are suspended in the coolant and activated by neutrons when the coolant passes through the reactor core activation section, and eventually become activated corrosion products. With the increase in the service life of nuclear reactors, the activated corrosion products in the reactor and the primary loop system continue to accumulate, causing the spatial dose level in the reactor building to increase. At the same time, the deposition of activated corrosion products on the surface of the primary loop equipment will reduce the heat transfer efficiency and equipment performance, and severely damage the sealing surface, resulting in sealing failure. In addition, activated corrosion products will enter the radioactive waste treatment facilities with the discharge and maintenance of reactor radioactive wastewater, causing wastewater facility pollution and equipment failure.

[0003] In order to ensure the inherent safety of facilities and equipment and reduce the radiation dose of personnel engaged in in-service inspection, maintenance and material replacement, it is necessary to control the accumulated corrosion products in the primary loop system of the reactor and decontaminate the primary loop system by physical methods. Utility Model Content

[0004] The main purpose of the utility model is to provide a nuclear reactor external physical decontamination device, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A nuclear reactor external physical decontamination device comprises a box body, characterized in that: a lifting port is provided at the upper end of the box body, a partition plate is fixedly connected to the inner side of the box body, a pipeline installation layer is provided at the lower end of the inner partition plate of the box body, an inlet valve is installed inside the pipeline installation layer, a circulation pump is installed at one end of the inlet valve, a connecting pipe is fixedly connected to one end of the circulation pump, a pump outlet valve is fixedly connected to one end of the connecting pipe, a circulating pump voltage measuring point is installed on the inner side of the pump outlet valve, a circulating pump current measuring point is installed inside the pump outlet valve, a main circuit flow measuring point is installed on the inner side of the connecting pipe, a plurality of sampling valves are installed on the outer side of the connecting pipe, and the outer side of the connecting pipe is provided with a plurality of sampling valves. A buffer tank is fixedly connected to the side, a liquid collecting tank is installed inside the pipeline installation layer, and a liquid level measuring point of the liquid collecting tank is installed on the inner side of the liquid collecting tank; an equipment installation layer is opened at the upper end of the inner partition plate of the box body, a valve room is opened on the inner side of the equipment installation layer, and a fan is installed inside the valve room; a primary filter is fixedly connected to one side of the fan, and primary filtration pressure difference measuring points are installed on both the front and rear sides of the primary filter; a high-efficiency filter is fixedly connected to the other side of the primary filter, and high filtration pressure difference measuring points are installed on both the front and rear sides of the high-efficiency filter; a control room is opened on the inner side of the equipment installation layer, and a control system is installed inside the control room; an exhaust outlet is opened at the front end of the equipment installation layer.

[0007] Preferably, the other end of the pump outlet valve is fixedly connected to two groups of primary filters, the two groups of primary filters are respectively fixedly connected to four groups of secondary filters, the four groups of secondary filters are all fixedly connected to third-stage filters, the four groups of third-stage filters are commonly fixedly connected to an outlet valve, and the outlet valve is installed on the inner side of the exhaust port.

[0008] Preferably, a filter pressure difference measuring point is installed at both the front and rear ends of the two groups of first-stage filters, and the upper ends of the two groups of first-stage filters are fixedly connected with a first-stage filter isolation valve, and the front and rear ends of the four groups of second-stage filters are installed with a second-stage filter pressure difference measuring point, and the upper ends of the four groups of second-stage filters are respectively fixedly connected with two groups of second-stage filter isolation valves, and the front and rear ends of the four groups of third-stage filters are installed with a third-stage filter pressure difference measuring point, and the upper ends of the four groups of third-stage filters are respectively fixedly connected with two groups of third-stage filter isolation valves.

[0009] Preferably, the other end of the outlet valve is fixedly connected to a water supply valve, which is connected to the deionized water system in the plant. The other end of the outlet valve is fixedly connected to the inlet of the reactor primary loop system, and the inlet of the inlet valve is fixedly connected to the outlet of the reactor primary loop system.

[0010] Preferably, a buffer tank liquid level measuring point is fixedly connected to the inner side of the buffer tank near the upper end, a buffer tank pressure measuring point is fixedly connected to the inner side of the buffer tank near the upper end, a safety valve is fixedly connected to the upper end of the buffer tank, an exhaust valve is fixedly connected to the upper end of the buffer tank, the other end of the exhaust valve is fixedly connected to a nitrogen switch valve, the other end of the nitrogen switch valve is fixedly connected to a nitrogen storage tank, and the nitrogen storage tank is fixedly connected to the partition plate.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The nuclear reactor external physical decontamination device: The decontamination device can be connected to the reactor primary loop system as a bypass of the system without unloading, filter out the activated corrosion products in the reactor and the primary loop system, realize the physical decontamination of the reactor primary loop system, and reduce the radioactivity level in the reactor building. By setting a safety valve and a nitrogen filling device on the buffer tank, the pressure of the decontamination loop can be kept stable and the system operation can be guaranteed to be safe. The reactor and the primary loop system are decontaminated by filtering, without chemical residues and corrosion, and the impact on the primary loop system and equipment is small. After filtration, the coolant returns to the primary loop system through the outlet valve, and less radioactive waste liquid is generated, which reduces the pressure of secondary waste treatment compared with chemical decontamination. The filter element is made of powder metallurgy to prevent the filter material from entering the loop system. The box interface is consistent with the standard container for easy transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a system diagram of a nuclear reactor external physical decontamination device loop system filtering and decontamination device of the utility model;

[0015] Figure 2 This is a filter arrangement diagram of a filter decontamination device for a nuclear reactor external physical decontamination device loop system of the utility model;

[0016] Figure 3 This is a front elevation view of a filter and decontamination device of a loop system of an external physical decontamination device for a nuclear reactor according to the utility model;

[0017] Figure 4 It is a rear front view of a filtering and decontamination device of a loop system of an external physical decontamination device for a nuclear reactor according to the utility model.

[0018] Figure 5 It is a top view of a filtering and decontamination device of a loop system of an external physical decontamination device for a nuclear reactor of the utility model;

[0019] Figure 6 This is a front view of a box of a nuclear reactor external physical decontamination device of the utility model;

[0020] Figure 7 This is a measuring point diagram of a filtering and decontamination device of a loop system of an external physical decontamination device for a nuclear reactor according to the utility model.

[0021] In the figure: 1. Inlet valve; 2. Circulation pump; 3. Buffer tank; 4. Safety valve; 5. Exhaust valve; 6. Nitrogen switch valve; 7. Nitrogen storage tank; 8. Pump outlet valve; 9. Primary filter isolation valve; 10. Primary filter; 11. Secondary filter isolation valve; 12. Secondary filter; 13. Thirdary filter isolation valve; 14. Thirdary filter; 15. Water supply valve; 16. Outlet valve; 17. Liquid collection tank; 18. Sampling valve; 19. Fan; 20. Primary filter; 21. High efficiency filter; 22. Control system; 23. Box; 2301 , pipeline installation layer; 2302, equipment installation layer; 2303, lifting port; 2304, valve room; 2305, control room; 2306, exhaust outlet; 24, partition board; 25, connecting pipeline; 26, circulating pump voltage measuring point; 27, circulating pump current measuring point; 28, buffer tank liquid level measuring point; 29, buffer tank pressure measuring point; 30, main circuit flow measuring point; 31, first filter pressure difference measuring point; 32, second filter pressure difference measuring point; 33, third filter pressure difference measuring point; 34, primary filter pressure difference measuring point; 35, high filter pressure difference measuring point; 36, collecting tank level measuring point. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] The utility model provides Figure 1-7The shown device is an external physical decontamination device for a nuclear reactor, wherein a lifting port 2303 is provided at the upper end of a box body 23, a partition plate 24 is fixedly connected to the inner side of the box body 23, a pipe installation layer 2301 is provided at the lower end of the inner partition plate 24 of the box body 23, an inlet valve 1 is installed inside the pipe installation layer 2301, a circulating pump 2 is installed at one end of the inlet valve 1, a connecting pipe 25 is fixedly connected to one end of the circulating pump 2, a pump outlet valve 8 is fixedly connected to one end of the connecting pipe 25, a circulating pump voltage measuring point 26 is installed on the inner side of the pump outlet valve 8, a circulating pump current measuring point 27 is installed inside the pump outlet valve 8, a main circuit flow measuring point 30 is installed on the inner side of the connecting pipe 25, a plurality of sampling valves 18 are installed on the outer side of the connecting pipe 25, a buffer tank 3 is fixedly connected to the outer side of the connecting pipe 25, and the pipe installation layer 2301 is provided with a plurality of sampling valves 18, a buffer tank 3 is fixedly connected to the outer side of the connecting pipe 25, and a plurality of sampling valves 18 are installed on the outer side of the connecting pipe 25. A liquid collecting tank 17 is installed inside 2301, and a liquid collecting tank liquid level measuring point 36 is installed on the inner side of the liquid collecting tank 17. An equipment installation layer 2302 is opened at the upper end of the inner partition plate 24 of the box body 23, and a valve room 2304 is opened on the inner side of the equipment installation layer 2302. A fan 19 is installed inside the valve room 2304, and a primary filter 20 is fixedly connected to one side of the fan 19. Primary filter pressure difference measuring points 34 are installed on the front and rear sides of the primary filter 20. A high-efficiency filter 21 is fixedly connected to the other side of the primary filter 20. High-efficiency filter pressure difference measuring points 35 are installed on the front and rear sides of the high-efficiency filter 21. A control room 2305 is opened on the inner side of the equipment installation layer 2302, and a control system 22 is installed inside the control room 2305. An exhaust outlet 2306 is opened at the front end of the equipment installation layer 2302.

[0024] In this embodiment, the other end of the pump outlet valve 8 is fixedly connected to two groups of primary filters 10, the two groups of primary filters 10 are respectively fixedly connected to four groups of secondary filters 12, the four groups of secondary filters 12 are all fixedly connected to the tertiary filters 14, and the four groups of tertiary filters 14 are commonly fixedly connected to the outlet valve 16, and the outlet valve 16 is installed on the inner side of the exhaust port 2306.

[0025] Specifically, the primary filter 10, the secondary filter 12 and the tertiary filter 14 are divided into three stages, two filter circuits, and a total of ten units to maximize the decontamination process.

[0026] In this embodiment, a filter pressure difference measuring point 31 is installed at both the front and rear ends of the two groups of first-level filters 10, and the upper ends of the two groups of first-level filters 10 are fixedly connected with a first-level filter isolation valve 9, and the front and rear ends of the four groups of second-level filters 12 are installed with a second filter pressure difference measuring point 32, and the upper ends of the four groups of second-level filters 12 are respectively fixedly connected with two groups of second-level filter isolation valves 11, and the front and rear ends of the four groups of third-level filters 14 are installed with a third filter pressure difference measuring point 33, and the upper ends of the four groups of third-level filters 14 are respectively fixedly connected with two groups of third-level filter isolation valves 13.

[0027] Specifically, an isolation valve is provided on each filter stage to isolate the single-stage filter. The filter is equipped with powder metallurgy filter elements of different specifications to prevent filter materials from entering the loop system. The filter elements of the first-stage filter isolation valve 9, the second-stage filter isolation valve 11 and the third-stage filter isolation valve 13 are made of metal powder metallurgy, and the filter materials will not enter the reactor primary loop system to damage the equipment.

[0028] In this embodiment, the other end of the outlet valve 16 is fixedly connected to the water supply valve 15, and the water supply valve 15 is connected to the deionized water system in the factory. The other end of the outlet valve 16 is fixedly connected to the inlet of the reactor primary loop system, and the inlet of the inlet valve 1 is fixedly connected to the outlet of the reactor primary loop system.

[0029] Specifically, the external physical decontamination device of the nuclear reactor primary loop system is connected externally, and the inlet valve 1 and the outlet valve 16 are respectively connected to the reactor outlet and inlet through the water supply valve 15 to establish an external filtering loop for the reactor primary loop.

[0030] In this embodiment, a buffer tank liquid level measuring point 28 is fixedly connected to the inner side of the buffer tank 3 near the upper end, a buffer tank pressure measuring point 29 is fixedly connected to the inner side of the buffer tank 3 near the upper end, a safety valve 4 is fixedly connected to the upper end of the buffer tank 3, an exhaust valve 5 is fixedly connected to the upper end of the buffer tank 3, the other end of the exhaust valve 5 is fixedly connected to a nitrogen switch valve 6, the other end of the nitrogen switch valve 6 is fixedly connected to a nitrogen storage tank 7, and the nitrogen storage tank 7 is fixedly connected to the partition plate 24.

[0031] Specifically, the decontamination system established between the external physical decontamination device of the primary loop system of the nuclear reactor and the primary loop of the reactor ensures the stability of the system pressure through the buffer tank 3 and the nitrogen storage tank 7. The buffer tank pressure measuring point 29 and the buffer tank liquid level measuring point 28 monitor the status of the buffer tank 3 in real time, and the safety valve 4 ensures the internal air pressure.

[0032] Working principle: Install the external physical decontamination device of the primary loop system of the nuclear reactor in place at an appropriate location in the reactor building, connect the inlet valve 1 to the outlet of the primary loop system of the reactor, connect the outlet valve 16 to the inlet of the primary loop system of the reactor, connect the water supply valve 15 to the deionized water system in the building, and connect the outlet of the collecting tank 17 to the wastewater collection system of the building.

[0033] The exhaust valve 5 and sampling valve 18 above the buffer tank 3 are in an open state. The water supply valve 15 is opened to use the deionized water system in the plant to fill the external physical decontamination device of the nuclear reactor primary loop system with water. After the water output from the exhaust valve 5 and sampling valve 18 is stable, the valves are closed to complete the filling and exhaust of the device.

[0034] Adjust the outlet pressure in the nitrogen storage tank 7 to the specified pressure, open the nitrogen switch valve 6 to inflate the system, and stop inflating after the liquid level in the buffer tank 3 drops to the specified height.

[0035] Open the inlet valve 1 and the outlet valve 16, start the circulation pump 2, extract the cooling water of the reactor primary loop system, and then filter it through the primary filter 10, the secondary filter 12, and the tertiary filter 14 in turn. After filtering, the cooling water returns to the reactor primary loop system through the outlet valve 16. At the same time, start the fan 19, purify the air in the box 23 through the primary filter 20 and the high-efficiency filter 21, and then discharge it out of the box 23. During the operation, each measuring point monitors the operating status of the system and displays it on the control system 22. When the data is abnormal, turn off the circulation pump 2 and stop running.

[0036] After the reactor primary loop system is filtered, the circulation pump 2, the inlet valve 1, and the outlet valve 16 are closed in sequence to discharge the residual cooling water in the device to the liquid collecting tank 17, and finally to the waste liquid collection system in the plant.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A nuclear reactor external physical decontamination device, comprising a housing (23), characterized in that: The upper end of the box body (23) is provided with a lifting opening (2303), the inner side of the box body (23) is fixedly connected with a partition plate (24), the lower end of the inner partition plate (24) of the box body (23) is provided with a pipeline installation layer (2301), an inlet valve (1) is installed inside the pipeline installation layer (2301), one end of the inlet valve (1) is installed with a circulation pump (2), one end of the circulation pump (2) is fixedly connected with a connecting pipeline (25), and the connecting pipeline (25) is connected to the inner side of the box body (23). 5) is fixedly connected to one end of a pump outlet valve (8), a circulating pump voltage measuring point (26) is installed on the inner side of the pump outlet valve (8), a circulating pump current measuring point (27) is installed inside the pump outlet valve (8), a main circuit flow measuring point (30) is installed on the inner side of the connecting pipe (25), a plurality of sampling valves (18) are installed on the outer side of the connecting pipe (25), a buffer tank (3) is fixedly connected to the outer side of the connecting pipe (25), and the inner side of the pipe installation layer (2301) is provided with a flow rate measuring point of the main circuit (30). A liquid collecting tank (17) is installed at the inner side of the liquid collecting tank (17), a liquid level measuring point (36) of the liquid collecting tank is installed at the inner side of the liquid collecting tank (17), an equipment installation layer (2302) is provided at the upper end of the inner partition plate (24) of the box body (23), a valve room (2304) is provided at the inner side of the equipment installation layer (2302), a fan (19) is installed inside the valve room (2304), a primary filter (20) is fixedly connected to one side of the fan (19), and the primary filter (20) ) are installed with primary filtration pressure difference measuring points (34) on both the front and rear sides, a high efficiency filter (21) is fixedly connected to the other side of the primary filter (20), and high filtration pressure difference measuring points (35) are installed on both the front and rear sides of the high efficiency filter (21), a control room (2305) is opened on the inner side of the equipment installation layer (2302), a control system (22) is installed inside the control room (2305), and an exhaust port (2306) is opened at the front end of the equipment installation layer (2302).

2. The nuclear reactor external physical decontamination device according to claim 1, characterized in that: The other end of the pump outlet valve (8) is fixedly connected to two groups of primary filters (10), the two groups of primary filters (10) are respectively fixedly connected to four groups of secondary filters (12), the four groups of secondary filters (12) are all fixedly connected to tertiary filters (14), the four groups of tertiary filters (14) are commonly fixedly connected to an outlet valve (16), and the outlet valve (16) is installed on the inner side of the exhaust port (2306).

3. A nuclear reactor external physical decontamination device according to claim 2, characterized in that: A filter pressure difference measuring point (31) is installed at both the front and rear ends of the two groups of the first-stage filters (10); the upper ends of the two groups of the first-stage filters (10) are fixedly connected to a first-stage filter isolation valve (9); the front and rear ends of the four groups of the second-stage filters (12) are installed with a second-stage filter pressure difference measuring point (32); the upper ends of the four groups of the second-stage filters (12) are respectively fixedly connected to two groups of second-stage filter isolation valves (11); the front and rear ends of the four groups of the third-stage filters (14) are installed with a third-stage filter pressure difference measuring point (33); the upper ends of the four groups of the third-stage filters (14) are respectively fixedly connected to two groups of third-stage filter isolation valves (13).

4. The nuclear reactor external physical decontamination device according to claim 2, characterized in that: The other end of the outlet valve (16) is fixedly connected to a water supply valve (15), and the water supply valve (15) is connected to a deionized water system in a plant. The other end of the outlet valve (16) is fixedly connected to an inlet of a reactor primary loop system, and the inlet of the inlet valve (1) is fixedly connected to an outlet of the reactor primary loop system.

5. The nuclear reactor external physical decontamination device according to claim 1, characterized in that: A buffer tank liquid level measuring point (28) is fixedly connected to a position on the inner side of the buffer tank (3) near the upper end, a buffer tank pressure measuring point (29) is fixedly connected to a position on the inner side of the buffer tank (3) near the upper end, a safety valve (4) is fixedly connected to the upper end of the buffer tank (3), an exhaust valve (5) is fixedly connected to the upper end of the buffer tank (3), the other end of the exhaust valve (5) is fixedly connected to a nitrogen switch valve (6), the other end of the nitrogen switch valve (6) is fixedly connected to a nitrogen storage tank (7), and the nitrogen storage tank (7) is fixedly connected to the partition plate (24).

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