Boron injection system and method

Abstract

The invention provides a boron injection system and method, and relates to the technical field of nuclear power, and the system comprises an active injection unit which comprises a first boric acid tank and a pump, the outlet of the first boric acid tank is connected with the inlet of the pump, and the outlet of the pump is connected with a reactor core through a first pipeline; the passive injection unit comprises a second boric acid tank, a high-pressure gas storage tank and a first control valve, the second boric acid tank comprises a first inlet and an outlet, the first inlet of the second boric acid tank is connected with the high-pressure gas storage tank through the first control valve, and the outlet of the second boric acid tank is connected with the reactor core through a second pipeline. The boron injection system provided by the embodiment of the invention can inject boric acid into the reactor core under the condition of no power supply, and is relatively high in reliability and safety.

Description

Technical Field

[0001] The present application relates to the field of nuclear power technology, and in particular to a boron injection system and method. Background Art

[0002] When an accident occurs in the core of a nuclear power plant, boric acid usually needs to be injected to control the core reaction. At present, the boron injection system usually adopts an active boron injection system, which uses a pump to drive the boric acid injection into the core. In the absence of power supply, the pump in the active boron injection system cannot be started, making it difficult to inject boric acid into the core.

[0003] It can be seen that the existing boron injection system can only inject boric acid into the core when there is power supply, and its reliability and safety are relatively low. Summary of the invention

[0004] The embodiments of the present application provide a boron injection system and method to solve the problem that the existing boron injection system can only inject boric acid into the core when there is power supply, and its reliability and safety are low.

[0005] In order to solve the above technical problems, the present application is implemented as follows;

[0006] In a first aspect, an embodiment of the present application provides a boron implantation system, the system comprising:

[0007] An active injection unit comprises a first boric acid tank and a pump, wherein the outlet of the first boric acid tank is connected to the inlet of the pump, and the outlet of the pump is connected to the core through a first pipeline;

[0008] The passive injection unit includes a second boric acid tank, a high-pressure gas storage tank and a first control valve, wherein the second boric acid tank includes a first inlet and an outlet, the first inlet of the second boric acid tank is connected to the high-pressure gas storage tank through the first control valve, and the outlet of the second boric acid tank is connected to the core through a second pipeline.

[0009] In a second aspect, an embodiment of the present application provides a boron implantation method, which is applied to the system described in the first aspect, and the method includes:

[0010] When the boron injection system is powered by electricity and the boric acid in the second boric acid tank does not need to be injected into the core, the first pipeline is opened, and the boric acid in the first boric acid tank is injected into the core through the pump and the first pipeline;

[0011] When there is no electricity supply to the boron injection system, the first control valve is opened and the second pipeline is connected, and the boric acid in the second boric acid box is injected into the core through the second pipeline under the action of the gas pressure output by the high-pressure gas storage tank.

[0012] In the embodiment of the present application, a boron injection system is provided including an active injection unit and a passive injection unit. The active injection unit can inject boric acid into the core when there is power supply, and the passive injection unit can inject boric acid into the core under the action of the gas pressure of the high-pressure gas storage tank when there is no power supply. It can be seen that the boron injection system in the embodiment of the present application can also inject boric acid into the core when there is no power supply, and its reliability and safety are relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0014] Figure 1 A schematic diagram of a boron injection system provided in an embodiment of the present application;

[0015] Figure 2 One of the state diagrams of a boron implantation system provided in an embodiment of the present application;

[0016] Figure 3 The second state diagram of a boron implantation system provided in an embodiment of the present application;

[0017] Figure 4 The third state diagram of a boron implantation system provided in an embodiment of the present application;

[0018] Figure 5 A fourth state diagram of a boron implantation system provided in an embodiment of the present application;

[0019] Figure 6 A fifth state diagram of a boron implantation system provided in an embodiment of the present application;

[0020] Figure 7 A sixth state diagram of a boron implantation system provided in an embodiment of the present application;

[0021] Figure 8 This is the seventh state diagram of a boron implantation system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] See also Figure 1 , Figure 1 is a schematic diagram of a boron injection system provided by an embodiment of the present invention, such as Figure 1 As shown, the system comprises:

[0024] The active injection unit comprises a first boric acid tank 11 and a pump 12, wherein the outlet of the first boric acid tank 11 is connected to the inlet of the pump 12, and the outlet of the pump 12 is connected to the core 30 through a first pipeline;

[0025] The passive injection unit includes a second boric acid tank 21, a high-pressure gas storage tank 22 and a first control valve 23. The second boric acid tank 21 includes a first inlet and an outlet. The first inlet of the second boric acid tank 21 is connected to the high-pressure gas storage tank 22 through the first control valve 23, and the outlet of the second boric acid tank 21 is connected to the core 30 through a second pipeline.

[0026] It should be noted that the embodiments of the present application Figures 2 to 8 Schematic diagram of the boron injection system in different states. Figures 2 to 8 The valves in the figure are all filled with black shadows, indicating that the valve is in a closed state, and boric acid or airflow cannot pass through the valve. The valves not filled with black shadows in the figure indicate that the valve is in an open state, and boric acid or airflow can pass through the valve. For example, Figure 2 The outlet valve in is not filled with black shading, then Figure 2 The outlet valve in the first boric acid tank 11 is in an open state, and the boric acid in the first boric acid tank 11 can pass through the outlet valve; Figure 2 The containment isolation valve 43 in the figure is filled with black shadow, the containment isolation valve 43 is in a closed state, and boric acid cannot pass through the containment isolation valve 43.

[0027] The boron injection system in the embodiment of the present application belongs to the safety system of the nuclear power plant. During the normal operation of the power plant, the boron injection system is in a standby state. Figure 2 , Figure 2 It is a schematic diagram of the boron injection system in a standby state. The pump 12 in the active injection unit is in a shutdown standby state. Neither the active injection unit nor the passive injection unit injects boric acid into the core 30 .

[0028] The first boric acid tank 11 is used to store boric acid. The distance between the first boric acid tank 11 and the pump 12 in the active control unit may be relatively far, and the outlet of the first boric acid tank 11 may be connected to an outlet valve to control whether the boric acid in the first boric acid tank 11 can flow into the pump 12.

[0029] When there is power supply, the pump 12 can drive the boric acid in the first boric acid tank 11 to be injected into the core 30 in the reactor pressure vessel. As an example, the pump 12 can be a reciprocating piston pump 12, and the pump 12 can be a high-lift and low-flow piston pump 12, which can realize the Reactor Coolant Pressure Boundary (RCPB) water pressure test function. The inlet of the pump 12 can be connected to the pump front valve, and the outlet of the pump 12 can be connected to the third control valve 14 (i.e. Figure 2 By setting it in this way, when the pump 12 needs to be repaired or replaced, the pump front valve and the pump rear valve can be closed to improve the safety of repairing the pump or replacing the pump.

[0030] The first pipeline is provided with a control valve (i.e. Figures 2 to 8 The main isolation valve in the first pipeline is used to control the on-off of the first pipeline. When the main isolation valve in the first pipeline is in a closed state, the first pipeline is disconnected, and the boric acid in the first boric acid tank 11 cannot be injected into the core 30 through the first pipeline.

[0031] The second boric acid tank 21 is also used to store boric acid, and the boric acid concentration in the first boric acid tank 11 may be the same as or different from the boric acid concentration in the second boric acid tank 21. The passive injection unit may also be provided with some instruments to measure some parameters in the second boric acid tank 21, such as a pressure gauge, a liquid level gauge, and a thermometer.

[0032] The second pipeline is provided with a control valve (i.e. Figures 2 to 8 The isolation valve 26 on the second pipeline is used to control the on-off of the second pipeline. The outlet of the second boric acid tank 21 is connected to the isolation valve 26. When the isolation valve 26 is in a closed state, the boric acid in the second boric acid tank 21 cannot be injected into the core 30 through the second pipeline. A first check valve 27 can also be set on the second pipeline. The first check valve 27 can effectively prevent the boric acid from flowing into the second boric acid tank 21 through the isolation valve 26 of the second pipeline and the outlet of the second boric acid tank 21.

[0033] The high-pressure gas storage tank 22 is a passive driving gas source, and the high-pressure gas storage tank 22 is connected to the first control valve 23, and the first control valve 23 is an adjustable pressure reducing valve. When the first control valve 23 is opened, the first control valve 23 can be adjusted to an injection pressure, so that the second boric acid tank 21 can inject boric acid into the core 30 through the second pipeline under the effect of the gas pressure output by the high-pressure gas storage tank 22. Among them, the passive injection unit can also be provided with some instruments to measure some parameters in the high-pressure gas storage tank 22, such as a pressure gauge.

[0034] Considering that the active injection unit utilizes the pump 12 to drive the boric acid injection into the core 30, and its boric acid injection efficiency is higher, when the boric acid injection system has power supply, if an accident occurs in the core 30 and boric acid needs to be injected urgently to control the reactivity of the core 30, the active injection unit is started first, that is, the pump 12 is controlled to start first to control the boric acid in the first boric acid tank 11 to be injected into the core 30; then consider whether it is necessary to start the passive injection unit, that is, consider whether it is necessary to control the boric acid in the second boric acid tank 21 to be injected into the core 30.

[0035] Specifically, if an accident occurs in the core 30 and boric acid needs to be injected urgently to control the reactivity of the core 30, when there is power supply in the boron injection system, the first boric acid tank 11 in the active injection unit is put into operation, and whether the second boric acid tank 21 in the passive injection unit is put into operation is determined according to the working conditions. Figure 3 , Figure 3 Schematic diagram of only putting the first boric acid tank 11 into operation and not putting the second boric acid tank 21 into operation. Figure 3 As shown: when the first boric acid tank 11 in the active injection unit is put into operation and the second boric acid tank 21 in the passive injection unit is not put into operation, the main isolation valve in the first pipeline is opened to make the first pipeline conductive, and the boric acid in the first boric acid tank 11 is injected into the core 30 through the pump 12 and the first pipeline.

[0036] See also Figure 4 , Figure 4 Schematic diagram of only the second boric acid tank 21 being put into operation. If an accident occurs in the core 30 and boric acid needs to be injected urgently to control the reactivity of the core 30, in the case where there is no electricity supply to the above-mentioned boron injection system, Figure 4 As shown, the first control valve 23 is opened, adjusted to an injection pressure, and the second pipeline is connected (the isolation valve 26 on the second pipeline is opened), and the boric acid in the second boric acid tank 21 is injected into the core 30 through the second pipeline under the action of the gas pressure of the high-pressure gas storage tank 22.

[0037] In the embodiment of the present application, a boron injection system is provided including an active injection unit and a passive injection unit. The active injection unit can inject boric acid into the core 30 when there is power supply, and the passive injection unit can inject boric acid into the core 30 under the action of the gas pressure of the high-pressure gas storage tank 22 when there is no power supply. It can be seen that the boron injection system in the embodiment of the present application is a boron injection system combining active and passive, which can also inject boric acid into the core 30 when there is no power supply, and has high reliability and safety.

[0038] Optionally, the second boric acid tank 21 is disposed inside the containment vessel.

[0039] The reactor pressure vessel including the core 30 is arranged in the containment. Considering the limited boron injection efficiency of the passive injection unit, the second boric acid tank 21 is arranged in the containment. This can make the distance between the second boric acid tank 21 and the core closer, so that the boric acid in the second boric acid tank 21 can be injected into the core 30 through a shorter pipeline, which is beneficial to improving the boron injection effect and shortening the time for the reactivity of the core 30 to reach the control target.

[0040] In some embodiments, when the second boric acid tank 21 is disposed inside the containment, the high-pressure gas tank 22 in the passive injection unit may be disposed inside the containment or outside the containment. If the high-pressure gas tank 22 is disposed inside the containment, the length of the driving pipeline connected to the high-pressure gas tank 22 can be reduced, thereby driving the second boric acid tank injection more quickly; if the high-pressure gas tank 22 is disposed outside the containment, the high-pressure gas tank 22 does not need to occupy the space inside the containment, and the risk that the high-pressure gas tank 22 may cause to the inside of the containment can be avoided.

[0041] Optionally, the second boric acid tank 21 further includes a second inlet, and the outlet of the pump 12 is further connected to the second inlet of the second boric acid tank 21 via a third pipeline, and the third pipeline is provided with a second control valve 24 .

[0042] In this embodiment, the boric acid in the first boric acid tank 11 can be injected into the second sulfuric acid tank through the pump 12 and the third pipeline. A second control valve 24 is provided on the third pipeline, and the second control valve 24 is used to control the flow of boric acid passing through the third pipeline, including the size of the flow and the presence or absence of the flow. The second control valve 24 can be a flow regulating shut-off valve.

[0043] If an accident occurs in the core 30 and boric acid needs to be injected urgently to control the reactivity of the core 30, the first boric acid tank 11 in the active injection unit is put into operation under the condition that there is power supply in the boron injection system, and whether the second boric acid tank 21 in the passive injection unit is put into operation is determined according to the working conditions. Figure 4 , Figure 4 The schematic diagram of putting the first boric acid tank 11 and the second boric acid tank 21 into operation is as follows: the pump 12 is started, the second control valve 24 is opened, and the third pipeline between the outlet of the pump 12 and the second inlet of the second boric acid tank 21 is connected; the isolation valve 26 in the second pipeline is connected to make the second pipeline connected, and the boric acid in the first boric acid tank 11 is injected into the second boric acid tank 21 through the pump 12 and the third pipeline; under the action of the pressure of the boric acid injected into the first boric acid tank 11, the second boric acid tank 21 injects boric acid into the core 30 through the second pipeline.

[0044] It should be noted that a second check valve 28 may be provided on the third pipeline, and the second check valve 28 is provided between the second control valve 24 and the second inlet of the second boric acid tank 21 , and the second check valve 28 is used to prevent the boric acid in the second boric acid tank 21 from flowing into the second control valve 24 through the second inlet.

[0045] Based on the above, in the case where both the first boric acid tank 11 and the second boric acid tank 21 need to be put into operation, the boric acid in the first boric acid tank 11 can be injected into the second boric acid tank 21 through the pump 12 and the third pipeline. Under the pressure of the injected boric acid, the second boric acid tank 21 can inject boric acid into the core 30 through the second pipeline. It is easy to understand that the high-pressure gas tank 22 usually needs to be supplemented with gas after use. In the embodiment of the present application, when there is an electrical supply in the boron injection system, if the second boric acid tank 21 in the non-energy system needs to be put into operation, it is not necessary to use the gas pressure in the high-pressure gas tank 22, so there is no need to supplement the gas in the high-pressure gas tank 22, which is conducive to improving the flexibility of the boron injection system.

[0046] Optionally, the third pipeline is also provided with a mixing valve 25, wherein the first end of the mixing valve 25 is connected to the second control valve 24, the second end of the mixing valve 25 is connected to the second inlet of the second boric acid tank 21, and the third end of the mixing valve 25 is connected to the boron supply system.

[0047] In this embodiment, the third end of the mixing valve 25 is connected to the boron supply system, and the boron supply system can supply boric acid to the second boric acid tank 21 through the mixing valve 25 and the second inlet of the second boric acid tank 21. Specific supply modes include the following:

[0048] Mode 1: Start the boron supply system, which directly supplies boric acid to the second boric acid tank 21 .

[0049] Mode 2: When the second boric acid tank 21 is under high pressure, the pump 12 in the active system and the boron supply system can cooperate to complete the replenishment of boric acid water in the second boric acid tank 21. Figure 6 , under the high pressure state of the second boric acid tank 21, the pump 12 in the active system is started, the boron supply system is started, and the second control valve 24 in the third pipeline is opened. The pump 12 drives the boric acid in the first boric acid tank 11 to pass through the mixing valve 25 in the third pipeline. Driven by the boron, the flow rate of the boric acid in the first boric acid tank 11 flowing through the mixing valve 25 is relatively fast; the boric acid in the boron supply system is mixed with the boric acid in the first boric acid tank 11 through the mixing valve 25. After mixing, the flow rate of the boric acid can still be relatively fast, so that the boric acid can flow into the second boric acid tank 21.

[0050] It should be noted that the inlet of the first boric acid tank 11 in the active injection unit can also be connected to the boron supply system to replenish boric acid to the first boric acid tank 11. In some embodiments, the boric acid concentration in the second boric acid tank 21 is higher than the boric acid concentration in the first boric acid tank 11. In this embodiment, the boric acid concentration of the boron supply system connected to the second boric acid tank 21 can be set to be greater than the boric acid concentration of the boron supply system connected to the first boric acid tank 11.

[0051] By the above arrangement, whether or not the second boric acid tank 21 is in a high pressure state, boric acid can be supplied to the second boric acid tank, which is beneficial to improving the flexibility of boron supply.

[0052] Optionally, the active injection unit is disposed outside the containment shell, and the system further comprises a first injection protection unit, and the outlet of the pump 12 is connected to the containment shell via the first injection protection unit.

[0053] The active injection unit has a high boric acid injection efficiency and can be arranged outside the containment. In order to improve the safety of the boron injection system, a first injection protection unit is arranged in the embodiment of the present application so that the boric acid can enter the containment only after passing through the first protection unit.

[0054] The first protection unit includes a first flow orifice plate 41, a first flow meter 42 and a containment isolation valve 43. When the active injection unit needs to input boric acid into the containment, the containment isolation valve 43 is in an open state. According to the flow orifice plate and the flow meter, the flow rate of the boric acid injected into the containment can be calculated, and then the flow rate of the boric acid can be reasonably adjusted to prevent the flow rate from being too large and detrimental to the safety of the containment, and to prevent the flow rate from being too small and detrimental to the boron injection effect.

[0055] In some embodiments, a third check valve 61 may be further provided in the containment shell. The first protection unit is connected to the third check valve 61 of the containment shell. The third check valve 61 is used to prevent boric acid from flowing from the containment shell to the first protection unit.

[0056] In the embodiment of the present application, the active injection unit is arranged outside the containment shell. By setting the system to also include a first injection protection unit, and the outlet of the pump 12 is connected to the containment shell through the first protection unit, it is beneficial to improve the safety of the boron injection system.

[0057] Optionally, the first pipeline and the second pipeline are merged into the core 30 through a fourth pipeline, and the system further includes a second injection protection unit arranged in the fourth pipeline.

[0058] The second injection protection unit may include a second flow orifice 51, a second flow meter 52 and a fifth control valve 53. The second flow orifice 51 and the second flow meter 52 are used to calculate the flow rate of boric acid injected into the core 30. The fifth control valve 53 may be a flow regulating shut-off valve, and the fifth control valve 53 is used to control the flow rate of boric acid entering the core 30, including the size of the boric acid flow rate and the presence or absence of the boric acid flow rate. The second injection unit may also include a fourth check valve 54, one end of the fourth check valve 54 is connected to the fifth control valve 53, and the other end is connected to the core 30, and the fourth check valve is used to prevent the boric acid in the core 30 from flowing out.

[0059] In the embodiment of the present application, the first pipeline and the second pipeline are arranged to merge into the core 30 through a fourth pipeline, and the fourth pipeline is arranged to include a second injection protection unit. On the one hand, the safety of the boron injection system can be improved; on the other hand, there is no need to respectively arrange a second injection protection unit in the first pipeline and another injection protection unit in the second pipeline, which is conducive to saving the cost of the boron injection system.

[0060] Optionally, the active control unit further includes:

[0061] The fifth pipeline, the outlet of the pump 12 is also connected to the fifth pipeline, the outlet of the pump 12 is connected to the inlet of the first boric acid tank 11 through the fifth pipeline, and the fifth pipeline is provided with a safety valve 13.

[0062] In the embodiment of the present application, the safety valve 13 can be automatically opened when the pressure reaches a predetermined value. As an example, the safety valve 13 can be an angle safety valve 13.

[0063] See also Figure 7 , Figure 7 The fifth pipeline is put into operation in the present embodiment. The fifth pipeline is put into operation in the case where the active injection unit is not required to inject boric acid into the core 30 (such as Figure 7 The pump back valve in the active injection unit is in a closed state), and the pump 12 of the active injection unit is mistakenly turned on. After the pump 12 of the active injection unit is mistakenly turned on, the boric acid output by the pump 12 flows to the safety valve 13. When the pressure applied by the boric acid to the safety valve 13 reaches a predetermined value, the safety valve 13 opens, and the boric acid flows into the first boric acid tank 11 through the safety valve 13 and the inlet of the first boric acid tank 11, thereby realizing the sub-circulation of the boric acid and improving the safety of the boron injection system.

[0064] See also Figure 7 A fifth check valve 17 can also be provided in the fifth pipeline. The safety valve 13 is connected to the inlet of the first boric acid tank 11 through the fifth check valve 17. The fifth check valve 17 is used to prevent the boric acid in the first boric acid tank 11 from flowing out of the fifth check valve 17 through the inlet of the first boric acid tank.

[0065] The above arrangement is helpful to improve the safety of the boron injection system.

[0066] Optionally, the active control unit further includes:

[0067] a third control valve 14, wherein the third control valve 14 is disposed between the outlet of the pump 12 and the first pipeline, and the third control valve 14 is connected to the outlet of the pump 12 and the first pipeline respectively;

[0068] The sixth pipeline, the third control valve 14 is also connected to the sixth pipeline, the third control valve 14 is connected to the inlet of the first boric acid tank 11 through the sixth pipeline, and the sixth pipeline includes a pressure reducing orifice 15 and a fourth control valve 16 connected in sequence.

[0069] The active control unit includes a third control valve 14 (i.e. Figures 2 to 8 The sixth pipeline in the embodiment of the present application is put into operation and is applied to the scenario of testing the pump 12 in the active injection unit and to the scenario of stirring the boric acid in the first boric acid tank 11. Among them, the above-mentioned test scenario and stirring scenario are scenarios in which the active injection unit does not need to inject boric acid into the core 30 but needs to start the pump 12.

[0070] The sixth pipeline includes a pressure reducing orifice plate 15 and a fourth control valve 16 connected in sequence. The fourth control valve 16 can be an isolation valve (i.e. Figures 2 to 8 The electric isolation valve in the sixth pipeline is opened when the sixth pipeline is put into operation. For details, please refer to Figure 8 , Figure 8 The fourth control valve 16 in the sixth pipeline is in a normally closed state (i.e., usually in a closed state). When the pump 12 needs to be tested, or the boric acid in the first boric acid tank 11 needs to be stirred, the pump 12 in the active unit is started and the fourth control valve 16 is opened. The boric acid output by the pump 12 flows into the first boric acid tank 11 through the rear valve of the pump 12, the pressure reducing orifice 15, the fourth control valve 16, and the inlet of the first boric acid tank 11. The boric acid flows into the first boric acid tank 11, thereby stirring the boric acid in the first boric acid tank 11.

[0071] The embodiment of the present application can meet the requirements of testing the pump 12 (for example, whether the test pump 12 can be used, etc.) through the above configuration, and can meet the requirements of stirring the boric acid in the first boric acid box 11, thereby reducing the risk of boric acid crystallization.

[0072] In some embodiments, the fourth control valve 16 may be connected to the inlet of the first boric acid tank 11 through the fifth check valve 17 .

[0073] In some embodiments, if the fifth pipeline and the sixth pipeline are set at the same time, when the sixth pipeline is put into operation, the pressure of the boric acid output by the pump 12 can be reasonably set to effectively avoid erroneous triggering of the fifth pipeline.

[0074] Optionally, the boric acid concentration of the second boric acid box 21 is greater than the boric acid concentration of the first boric acid box 11 .

[0075] The boric acid in the first boric acid tank 11 is injected into the core 30 through the pump 12, and its injection rate is faster than that of the second boric acid tank 21. In the embodiment of the present application, the boric acid concentration of the second boric acid tank 21 is set to be greater than that of the first boric acid tank 11. When the injection rate of the second boric acid tank 21 is slower, by increasing the concentration of boric acid injected into the core 30 by the second boric acid tank 21, the boric acid injection effect of the second boric acid tank 21 can be effectively improved, and the time for the reactivity of the core 30 to reach the control target can be shortened.

[0076] In some embodiments, an electric heating device may be provided in the second boric acid box 21 to maintain the temperature of the boric acid solution in the second boric acid box 21 and prevent the concentrated boric acid solution in the second boric acid box 21 from crystallizing.

[0077] The present application also provides a boron implantation method, which is applied to the boron implantation system described in any one of the above embodiments, and the method includes:

[0078] When the boron injection system is powered by electricity and the boric acid in the second boric acid tank does not need to be injected into the core, the first pipeline is opened, and the boric acid in the first boric acid tank is injected into the core through the pump and the first pipeline;

[0079] When there is no electricity supply to the boron injection system, the first control valve is opened and the second pipeline is connected, and the boric acid in the second boric acid box is injected into the core through the second pipeline under the action of the gas pressure output by the high-pressure gas storage tank.

[0080] Optionally, when there is electricity supply to the boron injection system and when it is necessary to inject the boric acid in the second boric acid tank into the core, the third pipeline between the outlet of the pump and the second inlet of the second boric acid tank is connected, and the second pipeline is connected;

[0081] The boric acid in the first boric acid tank is injected into the second boric acid tank through the pump and the third pipeline;

[0082] Under the action of the pressure of the boric acid injected from the first boric acid tank, the second boric acid tank injects boric acid into the core through the second pipeline.

[0083] Any of the boron implantation systems in the above embodiments can be applied to the boron implantation method in the embodiments of the present application, and can achieve the same technical effect. To avoid repetition, they will not be described here.

[0084] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A boron implantation system, characterized in that: The system comprises: An active injection unit comprises a first boric acid tank and a pump, wherein the outlet of the first boric acid tank is connected to the inlet of the pump, and the outlet of the pump is connected to the core through a first pipeline; The passive injection unit includes a second boric acid tank, a high-pressure gas storage tank and a first control valve, wherein the second boric acid tank includes a first inlet and an outlet, the first inlet of the second boric acid tank is connected to the high-pressure gas storage tank through the first control valve, and the outlet of the second boric acid tank is connected to the core through a second pipeline.

2. The system according to claim 1, characterized in that The second boric acid box is arranged inside the containment vessel.

3. The system according to claim 2, characterized in that The second boric acid tank also includes a second inlet, and the outlet of the pump is also connected to the second inlet of the second boric acid tank through a third pipeline, and the third pipeline is provided with a second control valve.

4. The system according to claim 3, characterized in that The third pipeline is also provided with a mixing valve, wherein a first end of the mixing valve is connected to the second control valve, a second end of the mixing valve is connected to the second inlet of the second boric acid tank, and a third end of the mixing valve is connected to a boron supply system.

5. The system according to any one of claims 2 to 4, characterized in that The active injection unit is arranged outside the containment shell. The system further comprises a first injection protection unit. The outlet of the pump is connected to the containment shell through the first injection protection unit.

6. The system according to any one of claims 1 to 4, characterized in that The first pipeline and the second pipeline are merged into the core through a fourth pipeline, and the system further includes a second injection protection unit arranged in the fourth pipeline.

7. The system according to claim 1, characterized in that The active control unit also includes: The fifth pipeline, the outlet of the pump is also connected to the fifth pipeline, the outlet of the pump is connected to the inlet of the first boric acid tank through the fifth pipeline, and the fifth pipeline is provided with a safety valve.

8. The system according to claim 1, characterized in that The active control unit also includes: a third control valve, the third control valve being disposed between the outlet of the pump and the first pipeline, and the third control valve being connected to the outlet of the pump and the first pipeline respectively; The sixth pipeline, the third control valve is also connected to the sixth pipeline, the third control valve is connected to the inlet of the first boric acid box through the sixth pipeline, and the sixth pipeline includes a pressure reducing orifice plate and a fourth control valve connected in sequence.

9. The system according to claim 1, characterized in that The boric acid concentration of the second boric acid box is greater than the boric acid concentration of the first boric acid box.

10. A boron implantation method, applied to the boron implantation system according to any one of claims 1 to 9, characterized in that: The method comprises: When the boron injection system is powered by electricity and the boric acid in the second boric acid tank does not need to be injected into the core, the first pipeline is opened, and the boric acid in the first boric acid tank is injected into the core through the pump and the first pipeline; When there is no electricity supply to the boron injection system, the first control valve is opened and the second pipeline is connected, and the boric acid in the second boric acid box is injected into the core through the second pipeline under the action of the gas pressure output by the high-pressure gas storage tank.

11. The method according to claim 10, characterized in that When the boron injection system is powered by electricity and the boric acid in the second boric acid tank needs to be injected into the core, the third pipeline between the outlet of the pump and the second inlet of the second boric acid tank is opened, and the second pipeline is opened; The boric acid in the first boric acid tank is injected into the second boric acid tank through the pump and the third pipeline; Under the action of the pressure of the boric acid injected from the first boric acid tank, the second boric acid tank injects boric acid into the core through the second pipeline.

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