A VVER nuclear island equipment cooling water dosing and purification system and method

Abstract

The present invention belongs to the technical field of cooling water dosing and purification, and specifically relates to a VVER nuclear island equipment cooling water dosing and purification system and method. The present invention includes a slow-release agent box, a dosing pump 1, a dosing pump 2, a sampling valve, a one-channel dosing system inlet valve, a one-channel nuclear island equipment cooling water pump 1, a one-channel nuclear island equipment cooling water pump 2, a cooling water pump 1 outlet check valve, a cooling water pump 2 outlet check valve, a cooling water pump 1 outlet electric valve, a cooling water pump 2 outlet electric valve, a cooling water pump 1 inlet electric valve, a cooling water pump 2 inlet electric valve, a two-channel dosing system inlet valve, a two-channel dosing system and a filter outlet main valve, and a filter outlet valve. The present invention can maintain the concentration of copper ions and the like in the cooling water of the nuclear island equipment within a normal range, thereby ensuring the safe and reliable operation of the VVER type unit.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling water dosing and purification, and in particular relates to a VVER nuclear island equipment cooling water dosing and purification system and method. Background Art

[0002] At present, when VVER units at home and abroad are actually running, the nuclear island equipment cooling water system is sampled and analyzed, and it is found that the copper content in the system medium is relatively high, and the copper concentration is between 200ug / L-1000ug / L. Due to the high electrode charge of copper, it will cause corrosion of stainless steel materials and other structural materials, and the corrosion products of metals and copper are easily adsorbed on the surface of the corroded metal, which accelerates the corrosion of stainless steel heat exchange tubes. In order to reduce the concentration of copper ions in the cooling water system of nuclear island equipment, it is necessary to add chemical drugs such as slow-release agents to the cooling water system of nuclear island equipment. However, at present, VVER units lack relevant systems that can effectively add drugs to the cooling water of nuclear island equipment. Therefore, it is urgent to develop a system for adding drugs and purifying the cooling water of nuclear island equipment of VVER units to maintain the concentration of copper ions and other substances in the cooling water of nuclear island equipment within the normal range, thereby ensuring the safe and reliable operation of VVER units. Summary of the invention

[0003] The object of the present invention is to provide a system and method for adding medicine to and purifying cooling water of nuclear island equipment of a VVER type unit, so as to maintain the concentration of copper ions and the like in the cooling water of the nuclear island equipment within a normal range, thereby ensuring the safe and reliable operation of the VVER type unit.

[0004] The technical solution adopted by the present invention is:

[0005] A VVER nuclear island equipment cooling water dosing and purification system comprises a slow-release agent box, a dosing pump 1, a dosing pump 2, a sampling valve, a one-channel dosing system inlet valve, a one-channel nuclear island equipment cooling water pump 1, a one-channel nuclear island equipment cooling water pump 2, a cooling water pump 1 outlet check valve, a cooling water pump 2 outlet check valve, a cooling water pump 1 outlet electric valve, a cooling water pump 2 outlet electric valve, a cooling water pump 1 inlet electric valve, a cooling water pump 2 inlet electric valve, a two-channel dosing system inlet valve, a two-channel dosing system and filter outlet main valve, and a filter outlet valve. The slow-release agent box is used to store and configure slow-release agents for use in four channels of the VVER nuclear island equipment cooling water system; the slow-release agent box is connected to the parallel dosing pump 1 and the dosing pump 2 through a pipeline, and the dosing pump 1 and the dosing pump 2 are standby for each other and are used to provide system dosing. power; a sampling valve is provided on the connecting pipeline, and the sampling valve is used to sample the solution in the slow-release agent box to conduct chemical analysis to see if it is qualified; the other ends of the parallel dosing pump 1 and dosing pump 2 are connected to the one-channel dosing system inlet valve and the two-channel dosing system inlet valve through pipelines respectively, and the one-channel dosing system inlet valve is connected to two pipelines respectively, and the two pipelines are respectively provided with a one-channel nuclear island equipment cooling water pump 1, a cooling water pump 1 outlet check valve, and a cooling water pump 1 outlet electric valve, a one-channel nuclear island equipment cooling water pump 2, a cooling water pump 2 outlet check valve, and a cooling water pump 2 outlet electric valve, and the two pipelines are also respectively provided with a cooling water pump 1 inlet electric valve and a cooling water pump 2 inlet electric valve; the other end of the two-channel dosing system inlet valve is respectively connected to the two-channel dosing system and the filter outlet main valve and the filter outlet valve.

[0006] The interior of the sustained-release agent box is provided with a stirrer and an electric heater. The stirrer is used to stir the chemicals in the sustained-release agent box to accelerate the dissolution of the chemicals; the electric heater is used to sample the solution in the sustained-release agent box to conduct chemical analysis to determine whether it is qualified.

[0007] The bottom of the slow-release agent box is provided with an emptying valve, and the emptying valve is used for emptying the slow-release agent box.

[0008] The two sides of the dosing pump 1 and the dosing pump 2 are respectively provided with a dosing pump 1 inlet manual valve and a dosing pump 1 outlet manual valve, a dosing pump 2 inlet manual valve and a dosing pump 2 outlet manual valve; the dosing pump 1 inlet manual valve and the dosing pump 1 outlet manual valve are used for the isolation of the dosing pump 1; the dosing pump 2 inlet manual valve and the dosing pump 2 outlet manual valve are used for the isolation of the dosing pump 2 (5).

[0009] The one-channel dosing system inlet valve is used to control the dosing of one-channel nuclear island equipment cooling water pump one and one-channel nuclear island equipment cooling water pump two; one-channel nuclear island equipment cooling water pump one and one-channel nuclear island equipment cooling water pump two are standby for each other and are used to provide cooling water power for one-channel nuclear island equipment; the cooling water pump one outlet check valve is used to prevent backflow of the one-channel nuclear island equipment cooling water pump one outlet pipeline; the cooling water pump two outlet check valve is used to prevent backflow of the one-channel nuclear island equipment cooling water pump two outlet pipeline; the cooling water pump one outlet electric valve and the cooling water pump one inlet electric valve are used to isolate the one-channel nuclear island equipment cooling water pump one; the cooling water pump two outlet electric valve and the cooling water pump two inlet electric valve are used to isolate the one-channel nuclear island equipment cooling water pump two.

[0010] The filter outlet valve is connected to the discharge flexible joint and the post-purification flexible joint, and the filter outlet valve serves as the boundary of the purification system.

[0011] The discharge flexible joint and the post-purification flexible joint are connected to the resin collector through the second connecting hose, and the resin collector is connected to the two-channel filter through the filter outlet valve. The resin collector is used to capture leaked resin when the purification system and the two-channel filter are damaged.

[0012] The two-channel filter is provided with a filter exhaust valve.

[0013] The other end of the two-channel filter is connected to the water filling soft joint and the pre-purification soft joint through the filter inlet valve and the connecting hose 1.

[0014] The two-channel dosing system and the filter outlet main valve are connected in sequence with the two-channel nuclear island equipment cooling water pump, the outlet electric valve and the inlet valve of the two-channel nuclear island equipment cooling water pump.

[0015] An inlet electric valve of the two-channel nuclear island equipment cooling water pump is arranged between the two-channel dosing system and the filter outlet main valve and the two-channel nuclear island equipment cooling water pump.

[0016] The other end of the inlet valve is connected to the front purification soft joint.

[0017] The water filling flexible joint is connected to the demineralized water through a flushing valve.

[0018] A method for adding medicine using cooling water of a VVER nuclear island equipment comprises the following steps:

[0019] Step 1, preparing a sustained-release agent solution;

[0020] Step 1.1, calculate the mass of the slow-release agent or TTA reagent and the mass of the deionized water to be added to the slow-release agent tank;

[0021] Step 1.2, start the agitator;

[0022] Step 1.3, start the electric heater;

[0023] Step 1.4: After observing that the reagent is completely dissolved, turn off the stirrer and the electric heater;

[0024] Step 2: Confirm the initial state;

[0025] Step 2.1, confirm that the cooling water pump 1 of the one-channel nuclear island equipment or the cooling water pump 2 of the one-channel nuclear island equipment is in operation;

[0026] Step 2.2, confirm that the sustained-release agent solution has been prepared;

[0027] Step 2.3, confirm that the status of related valves meets the requirements;

[0028] Step 3, start dosing pump 1 or dosing pump 2 to add medicine;

[0029] Step 4: Take samples from the sampling valve for analysis. When the water quality is qualified, close the dosing pump 1 or the dosing pump 2, and the dosing process is completed.

[0030] A method for utilizing a cooling water purification system of a VVER nuclear island equipment comprises the following steps:

[0031] Step 1: Confirm the initial state;

[0032] Step 1.1: The VVER nuclear island equipment cooling water dosing and purification system is not in the dosing condition;

[0033] Step 1.2: The second channel of the cooling water system of the VVER nuclear island equipment is in standby mode;

[0034] Step 1.3, confirm that the status of related valves meets the requirements;

[0035] Step 2, filling the filter with water;

[0036] Step 2.1, open the filter inlet valve, and connect the connecting hose 1 between the filter inlet valve and the front purification soft joint;

[0037] Step 2.2, open the flushing valve to fill water into the two-channel filter;

[0038] Step 2.3: When the filter exhaust valve continuously discharges water, close the exhaust valve;

[0039] Step 3, open the filter outlet valve to start flushing the resin;

[0040] Step 4: After flushing for a certain period of time, take samples for analysis. If qualified, close the flushing valve and the purification process is completed.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention provides a system and method for adding chemicals to and purifying cooling water for nuclear island equipment of a VVER type unit, which can achieve effective adjustment of the water quality of cooling water for nuclear island equipment of the VVER type unit. The adjustment method is safe and reliable, reduces the risk of chemical injury to human body, saves manpower and material resources, and greatly reduces the risk of leakage of primary circuit medium to cooling water of nuclear island equipment of the VVER type unit due to copper ion corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A system for adding medicine and purifying cooling water for nuclear island equipment of a VVER type unit provided by the present invention;

[0044] In the figure: 1-slow-release agent box, 2-agitator, 3-electric heater, 4-dosing pump 1, 5-dosing pump 2, 6-sampling valve, 7-dosing pump 1 inlet manual valve, 8-dosing pump 2 inlet manual valve, 9-dosing pump 1 outlet manual valve, 10-dosing pump 2 outlet manual valve, 11-drain valve, 12-one-channel dosing system inlet valve, 13-one-channel nuclear island equipment cooling water pump 1, 14-one-channel nuclear island equipment cooling water pump 2, 15-cooling water pump 1 outlet check valve, 16-cooling water pump 2 outlet check valve, 17-cooling water pump 1 outlet electric valve, 18-cooling water pump 2 outlet electric valve, 19-cooling water pump 1 inlet electric valve, 20-cooling water pump 2 inlet electric valve Valve, 21-two-channel dosing system inlet valve, 22-two-channel dosing system and filter outlet main valve, 23-two-channel nuclear island equipment cooling water pump, 24-two-channel nuclear island equipment cooling water pump outlet electric valve, 25-two-channel nuclear island equipment cooling water pump inlet electric valve, 26-inlet valve, 27-desalted water, 28-flushing valve, 29-water filling soft joint, 30-pre-purification soft joint, 31-connecting hose 1, 32-filter inlet valve, 33-filter exhaust valve, 34-two-channel filter, 35-filter outlet valve, 36-resin collector, 37-connecting hose 2, 38-discharge soft joint, 39-post-purification soft joint, 40-filter outlet valve. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] like Figure 1 As shown, a VVER nuclear island equipment cooling water dosing and purification system provided by the present invention includes a slow-release agent box 1, an agitator 2, an electric heater 3, a dosing pump 1 4, a dosing pump 2 5, a sampling valve 6, a dosing pump 1 inlet manual valve 7, a dosing pump 2 inlet manual valve 8, a dosing pump 1 outlet manual valve 9, a dosing pump 2 outlet manual valve 10, an emptying valve 11, a one-channel dosing system inlet valve 12, a one-channel nuclear island equipment cooling water pump 1 13, a one-channel nuclear island equipment cooling water pump 2 14, a cooling water pump 1 outlet check valve 15, a cooling water pump 2 outlet check valve 16, a cooling water pump 1 outlet electric valve 17, a cooling water pump 2 outlet electric valve 18, a cooling water pump 1 inlet electric valve 19. Cooling water pump second inlet electric valve 20, two-channel dosing system inlet valve 21, two-channel dosing system and filter outlet main valve 22, two-channel nuclear island equipment cooling water pump 23, two-channel nuclear island equipment cooling water pump outlet electric valve 24, two-channel nuclear island equipment cooling water pump inlet electric valve 25, inlet valve 26, desalted water 27, flushing valve 28, water filling flexible joint 29, pre-purification flexible joint 30, connecting hose one 31, filter inlet valve 32, filter exhaust valve 33, two-channel filter 34, filter outlet valve 35, resin collector 36, connecting hose two 37, discharge flexible joint 38, post-purification flexible joint 39, filter outlet valve 40.

[0049] The slow-release agent tank 1 is used for storing and dispensing the slow-release agent, which is shared by the four channels of the cooling water system of the VVER nuclear island equipment; the agitator 2 is used for agitating the chemicals in the slow-release agent tank 1 to accelerate the dissolution of the chemicals; the electric heater 3 is used for sampling the solution in the slow-release agent tank 1 to determine whether it is qualified by chemical analysis; the dosing pump 1 4 and the dosing pump 2 5 are standby for each other and are used to provide power for the system to dosing; the sampling valve 6 is used for sampling the solution in the slow-release agent tank 1 to determine whether it is qualified by chemical analysis; the dosing pump 1 inlet manual valve 7 and the dosing pump 1 outlet manual valve 9 are used for isolating the dosing pump 1 4; the dosing pump 2 inlet manual valve 8 and the dosing pump 2 outlet manual valve 10 are used for isolating the dosing pump 2 5; the drain valve 11 is used for draining the slow-release agent tank 1; the one-channel dosing system inlet valve 12 is used to control the one-channel dosing system. The cooling water pump 13 of the one-channel nuclear island equipment and the cooling water pump 2 14 of the one-channel nuclear island equipment are added; the cooling water pump 13 of the one-channel nuclear island equipment and the cooling water pump 2 14 of the one-channel nuclear island equipment are standby for each other and are used to provide cooling water power for the one-channel nuclear island equipment; the cooling water pump 1 outlet check valve 15 is used to prevent the backflow of the outlet pipeline of the one-channel nuclear island equipment cooling water pump 13; the cooling water pump 2 outlet check valve 16 is used to prevent the backflow of the outlet pipeline of the one-channel nuclear island equipment cooling water pump 2 14; the cooling water pump 1 outlet electric valve 17 and the cooling water pump 1 inlet electric valve 19 are used to isolate the cooling water pump 13 of the one-channel nuclear island equipment; the cooling water pump 2 outlet electric valve 18 and the cooling water pump 2 inlet electric valve 20 are used to isolate the cooling water pump 2 14 of the one-channel nuclear island equipment; the two-way The inlet valve 21 of the two-channel dosing system is used to control the dosing of the two-channel nuclear island equipment cooling water pump 23; the outlet main valve 22 of the two-channel dosing system and the filter is used to control the two-channel dosing system and the purification system to be connected to the two-channel nuclear island equipment cooling water pump 23; the two-channel nuclear island equipment cooling water pump 23 is used to provide cooling water power for the two-channel nuclear island equipment, and the slow-release agent in the slow-release agent box 1 passes through the two-channel dosing system inlet valve 21, the two-channel dosing system and the filter outlet main valve 22, the outlet electric valve 24 of the two-channel nuclear island equipment cooling water pump, the inlet valve 26, the front purification soft joint 30, and the connecting hose 31 to the two-channel filter 34 for purification, and then circulates through the post-purification soft joint 39; the outlet electric valve 24 and the two-channel nuclear island equipment cooling water pump The inlet electric valve 25 of the channel nuclear island equipment cooling water pump is used to isolate the two-channel nuclear island equipment cooling water pump 23; the inlet valve 26 is used to control the medium in the purification system to flow to the two-channel filter 34; the desalted water 27, the flushing valve 28, the water filling soft joint 29, and the connecting hose 31 form a water filling system, which is used to control the desalted water to fill the two-channel filter 34; the filter inlet valve 32 and the filter outlet valve 35 are used to isolate the two-channel filter 34; the filter exhaust valve is used to exhaust the two-channel filter 34; the two-channel filter 34 is used to purify the cooling water circulating in the two channels of the nuclear island equipment cooling water system, remove corrosion products, and ensure the quality of the cooling water; the resin collector 36 is used to capture the leaked resin when the purification system and the two-channel filter 34 are damaged;The connecting hose 2 37 and the discharge flexible joint 38 are used for draining the water filling system; the filter outlet valve 40 serves as the boundary of the purification system. ;

[0050] The present invention also provides a method for using a VVER nuclear island equipment cooling water dosing and purification system, wherein the dosing system comprises the following steps (taking a channel of a VVER nuclear island equipment cooling water system as an example):

[0051] Step 1, preparing a sustained-release agent solution;

[0052] Step 1.1, calculating the mass of the slow-release agent or TTA reagent and the mass of the deionized water to be added to the slow-release agent tank 1;

[0053] Step 1.2, start agitator 2;

[0054] Step 1.3, start the electric heater 3;

[0055] Step 1.4, after observing that the medicine is completely dissolved, turn off the stirrer 2 and the electric heater 3;

[0056] Step 2: Confirm the initial state;

[0057] Step 2.1, confirm that the cooling water pump 1 13 of the one-channel nuclear island equipment or the cooling water pump 2 14 of the one-channel nuclear island equipment is in operation;

[0058] Step 2.2, confirm that the sustained-release agent solution has been prepared;

[0059] Step 2.3, confirm that the status of related valves meets the requirements;

[0060] Step 3, start the dosing pump 1 4 or the dosing pump 2 5 to add medicine;

[0061] Step 4: Take samples from the sampling valve for analysis. When the water quality is qualified, close the dosing pump 1 4 or the dosing pump 2 5, and the dosing process is completed.

[0062] The present invention also provides a method for using a VVER nuclear island equipment cooling water dosing and purification system, wherein the purification system comprises the following steps (taking the second channel of the VVER nuclear island equipment cooling water system as an example):

[0063] Step 1: Confirm the initial state;

[0064] Step 1.1: The VVER nuclear island equipment cooling water dosing and purification system is not in the dosing condition;

[0065] Step 1.2: The second channel of the cooling water system of the VVER nuclear island equipment is in standby mode;

[0066] Step 1.3, confirm that the status of related valves meets the requirements;

[0067] Step 2, filling the filter with water;

[0068] Step 2.1, open the filter inlet valve 32, and connect the connecting hose 1 31 between the filter inlet valve 32 and the front purification soft joint 30;

[0069] Step 2.2, open the flushing valve 28 to fill water into the two-channel filter 34;

[0070] Step 2.3, when the filter exhaust valve 33 continuously discharges water, close the exhaust valve;

[0071] Step 3, open the filter outlet valve 35 to start flushing the resin;

[0072] Step 4: After flushing for a certain period of time, take samples for analysis. If the samples are qualified, close the flushing valve 28 and the purification process ends.

[0073] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0074] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A VVER nuclear island equipment cooling water dosing and purification system, characterized by: The invention comprises a slow-release agent box (1), a dosing pump 1 (4), a dosing pump 2 (5), a sampling valve (6), a one-channel dosing system inlet valve (12), a one-channel nuclear island equipment cooling water pump 1 (13), a one-channel nuclear island equipment cooling water pump 2 (14), a cooling water pump 1 outlet check valve (15), a cooling water pump 2 outlet check valve (16), a cooling water pump 1 outlet electric valve (17), a cooling water pump 2 outlet electric valve (18), a cooling water pump 1 inlet electric valve (19), a cooling water pump 2 outlet electric valve (19), a cooling water pump 3 outlet electric valve (20), a cooling water pump 3 outlet electric valve (21), a cooling water pump 3 outlet electric valve (22), a cooling water pump 3 outlet electric valve (23), a cooling water pump 3 outlet electric valve (24), a cooling water pump 3 outlet electric valve (25), a cooling water pump 3 outlet electric valve (26), a cooling water pump 3 outlet electric valve (27), a cooling water pump 3 outlet electric valve (28), a cooling water pump 3 outlet electric valve (29), a cooling water pump 3 outlet electric valve (30), a cooling water pump 3 outlet electric valve (31), a cooling water pump 3 outlet electric valve (32), a cooling water pump 3 outlet electric valve (33), a cooling water pump 3 outlet electric valve (34), a cooling water pump 3 outlet electric valve (35), a cooling water pump 3 outlet electric valve (36), a cooling water pump 3 outlet electric valve (37), a cooling water pump 3 outlet electric valve (38), a cooling water pump 3 outlet electric valve (39), a cooling water pump 3 outlet electric valve (40), a cooling water pump 3 outlet electric valve (41), a cooling water pump 3 outlet electric valve (42), a cooling water pump 3 outlet electric valve (43), a cooling water pump 3 outlet electric valve (44), a cooling water pump 3 outlet electric valve (45), a cooling water pump 3 outlet electric valve An inlet electric valve (20), a two-channel dosing system inlet valve (21), a two-channel dosing system and a filter outlet main valve (22), and a filter outlet valve (40); a slow-release agent tank (1) is used to store and configure a slow-release agent for use by four channels of a VVER nuclear island equipment cooling water system; the slow-release agent tank (1) is connected to a dosing pump 1 (4) and a dosing pump 2 (5) connected in parallel via a pipeline; the dosing pump 1 (4) and the dosing pump 2 (5) are mutually standby and are used to provide power for dosing the system; when connected A sampling valve (6) is provided on the pipeline, and the sampling valve (6) is used to sample the solution in the slow-release agent box (1) to perform chemical analysis to determine whether the solution is qualified. The other ends of the parallel dosing pumps 1 (4) and 2 (5) are respectively connected to a one-channel dosing system inlet valve (12) and a two-channel dosing system inlet valve (21) through pipelines. The one-channel dosing system inlet valve (12) is respectively connected to two pipelines. The one-channel nuclear island equipment cooling water pump 1 (13), a cooling water pump 1 outlet check valve (15), and a cooling water pump 1 outlet electric valve (17) are respectively provided on the two pipelines. The one-channel nuclear island equipment cooling water pump 2 (14), a cooling water pump 2 outlet check valve (16), and a cooling water pump 2 outlet electric valve (18) are respectively provided on the two pipelines. The cooling water pump 1 inlet electric valve (19) and the cooling water pump 2 inlet electric valve (20) are also respectively provided on the two pipelines. The other end of the two-channel dosing system inlet valve (21) is respectively connected to the two-channel dosing system and the filter outlet main valve (22) and the filter outlet valve (40).

2. A VVER nuclear island equipment cooling water dosing and purification system according to claim 1, characterized in that: The sustained-release agent box (1) is provided with a stirrer (2) and an electric heater (3) inside. The stirrer (2) is used to stir the chemical medicine in the sustained-release agent box (1) to accelerate the dissolution of the medicine. The electric heater (3) is used to take samples of the solution in the sustained-release agent box (1) to conduct chemical analysis to determine whether the solution is qualified.

3. A VVER nuclear island equipment cooling water dosing and purification system according to claim 1, characterized in that: The bottom of the slow-release agent box (1) is provided with a drain valve (11), and the drain valve (11) is used to drain the slow-release agent box (1).

4. A VVER nuclear island equipment cooling water dosing and purification system according to claim 1, characterized in that: The two sides of the dosing pump 1 (4) and the dosing pump 2 (5) are respectively provided with a dosing pump 1 inlet manual valve (7) and a dosing pump 1 outlet manual valve (9), a dosing pump 2 inlet manual valve (8) and a dosing pump 2 outlet manual valve (10); the dosing pump 1 inlet manual valve (7) and the dosing pump 1 outlet manual valve (9) are used to isolate the dosing pump 1 (4); the dosing pump 2 inlet manual valve (8) and the dosing pump 2 outlet manual valve (10) are used to isolate the dosing pump 2 (5).

5. A VVER nuclear island equipment cooling water dosing and purification system according to claim 1, characterized in that: The one-channel dosing system inlet valve (12) is used to control the dosing of one-channel nuclear island equipment cooling water pump one (13) and one-channel nuclear island equipment cooling water pump two (14); the one-channel nuclear island equipment cooling water pump one (13) and the one-channel nuclear island equipment cooling water pump two (14) are mutually standby and are used to provide cooling water power for the one-channel nuclear island equipment; the cooling water pump one outlet check valve (15) is used to prevent the backflow of the one-channel nuclear island equipment cooling water pump one (13) outlet pipeline; the cooling water pump two outlet check valve (16) is used to prevent the backflow of the one-channel nuclear island equipment cooling water pump two (14) outlet pipeline; the cooling water pump one outlet electric valve (17) and the cooling water pump one inlet electric valve (19) are used to isolate the one-channel nuclear island equipment cooling water pump one (13); the cooling water pump two outlet electric valve (18) and the cooling water pump two inlet electric valve (20) are used to isolate the one-channel nuclear island equipment cooling water pump two (14).

6. A VVER nuclear island equipment cooling water dosing and purification system according to claim 1, characterized in that: The filter outlet valve (40) is connected to the discharge flexible joint (38) and the post-purification flexible joint (39), and the filter outlet valve (40) serves as a boundary of the purification system.

7. A VVER nuclear island equipment cooling water dosing and purification system according to claim 6, characterized in that: The discharge flexible joint (38) and the post-purification flexible joint (39) are connected to the resin collector (36) via the second connecting hose (37). The resin collector (36) is connected to the two-channel filter (34) via the filter outlet valve (35). The resin collector (36) is used to capture leaked resin when the purification system and the two-channel filter (34) are damaged.

8. A VVER nuclear island equipment cooling water dosing and purification system according to claim 7, characterized in that: The two-channel filter (34) is provided with a filter exhaust valve (33).

9. A VVER nuclear island equipment cooling water dosing and purification system according to claim 8, characterized in that: The other end of the two-channel filter (34) is connected to the water filling flexible joint (29) and the pre-purification flexible joint (30) via a filter inlet valve (32) and a connecting hose 1 (31).

10. A VVER nuclear island equipment cooling water dosing and purification system according to claim 9, characterized in that: The two-channel dosing system and the filter outlet main valve (22) are connected in sequence to the two-channel nuclear island equipment cooling water pump (23), the outlet electric valve (24) of the two-channel nuclear island equipment cooling water pump, and the inlet valve (26).

11. A VVER nuclear island equipment cooling water dosing and purification system according to claim 10, characterized in that: An inlet electric valve (25) for the two-channel nuclear island equipment cooling water pump is provided between the two-channel dosing system and filter outlet main valve (22) and the two-channel nuclear island equipment cooling water pump (23).

12. A VVER nuclear island equipment cooling water dosing and purification system according to claim 11, characterized in that: The other end of the inlet valve (26) is connected to the pre-purification flexible joint (30).

13. A VVER nuclear island equipment cooling water dosing and purification system according to claim 12, characterized in that: The water filling flexible joint (29) is connected to the demineralized water (27) via a flushing valve (28).

14. A method for adding chemicals to cooling water of a VVER nuclear island equipment, based on a VVER nuclear island equipment cooling water adding and purification system as claimed in claim 13, characterized in that: The steps include: Step (1), preparing a sustained-release agent solution; Step (1.1), calculating the mass of the slow-release agent or TTA reagent and the mass of the deionized water to be added to the slow-release agent tank (1); Step (1.2), start the agitator (2); Step (1.3), starting the electric heater (3); After step (1.4), observing that the reagent is completely dissolved, turn off the stirrer (2) and the electric heater (3); Step (2), confirm the initial state; Step (2.1), confirm that the cooling water pump 1 (13) of the one-channel nuclear island equipment or the cooling water pump 2 (14) of the one-channel nuclear island equipment is in operation; Step (2.2), confirm that the sustained-release agent solution has been prepared; Step (2.3), confirm that the status of relevant valves meets the requirements; Step (3), start dosing pump 1 (4) or dosing pump 2 (5) to add medicine; Step (4), sampling and analysis are performed from the sampling valve. When the water quality is qualified, the dosing pump 1 (4) or the dosing pump 2 (5) is closed, and the dosing process is completed.

15. A method for utilizing a VVER nuclear island equipment cooling water purification system, based on the VVER nuclear island equipment cooling water dosing and purification system according to claim 13, characterized in that: The steps include: Step (1), confirm the initial state; Step (1.1), the VVER nuclear island equipment cooling water dosing and purification system is not in the dosing condition; Step (1.2), the second channel of the cooling water system of the VVER nuclear island equipment is in standby mode; Step (1.3), confirm that the status of relevant valves meets the requirements; Step (2), filling the filter with water; Step (2.1), open the filter inlet valve (32), and connect the connecting hose 1 (31) between the filter inlet valve (32) and the front purification soft joint (30); Step (2.2), opening the flushing valve (28) to fill the two-channel filter (34) with water; Step (2.3), when the filter exhaust valve (33) continuously discharges water, close the exhaust valve; Step (3), opening the filter outlet valve (35) to start flushing the resin; Step (4), after flushing for a certain period of time, sampling and analysis are performed. If the sample is qualified, the flushing valve (28) is closed and the purification process is completed.

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