Pipeline structure for charging pump of nuclear power station and giving consideration to emergency boron injection

Abstract

The utility model discloses a nuclear power station charging pump and emergency boron injection pipeline structure, which comprises a main charging pipeline, a circulating pipeline, a main output pipeline and a main boron injection pipeline, and the main charging pipeline is sequentially connected with a first isolating valve, the main boron injection pipeline, a first charging pump, the main output pipeline, a second isolating valve and a volume control box; the circulating pipeline is sequentially connected with the concentrated boron box, the main output pipeline, the third isolating valve, the circulating pump and the concentrated boron box to form a circulating pipeline; the main output pipeline is also connected with a fourth isolating valve, and the main boron injection pipeline is also connected with a fifth isolating valve; the emergency boron injection function is executed through the first charging pump, the first charging pump is in a normally-open state when the unit is normally filled with water, and the circulating pump is in a normally-open state or an intermittent-open state, so that long-time standby application of power equipment is avoided, and investment of related periodic tests and inspection is reduced. The equipment utilization rate is high, and part of pipelines can execute different functions under different working conditions, so that the arrangement space is more compact, and reactor type miniaturization is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant reactor operation, in particular to a pipeline structure for a nuclear power plant charging pump to concurrently perform emergency boron injection. Background Technique

[0002] Under the design basis conditions, the reactor control rods are inserted to complete reactivity control and maintain the subcritical state of the reactor core. However, in the accident condition of anticipated transient without scram (ATWS) in a nuclear power plant, such as when the control rods are stuck, emergency boron injection becomes an important means to control reactivity, maintain the subcritical state of the reactor core, and ensure a safe shutdown. Representative units in the prior art for realizing the emergency boron injection function are CPR, Hualong, and AP1000.

[0003] The CPR unit uses the direct boronization pipeline or the emergency boron injection pipeline in the reactor boron and water make-up system (REA) to perform the emergency boron injection function. The boric acid part of the REA system includes a boric acid solution preparation tank, three boric acid solution storage tanks, and four boric acid solution transfer pumps. An electric heater and a stirrer are provided in the boric acid solution preparation tank to prevent boric acid crystallization. In the ATWS accident condition, the electric isolation valve REA210VB on the direct boronization pipeline is opened, and the boric acid solution from the boric acid transfer pump is sent into the charging pump inlet through the direct boronization pipeline to realize the emergency boron injection function. In the accident situation where the normal boronization pipeline and the direct boronization pipeline are unavailable, the emergency boronization pipeline is put into operation, and REA205VB can be opened locally to inject the boric acid solution into the charging pump inlet to realize the emergency boron injection function.

[0004] The safety function of the Hualong unit in response to the ATWS accident condition is ensured by the emergency boron injection system (RBS). The RBS system is provided with three independent series each with a 100% capacity, meeting the single failure criterion. Two series are arranged in the fuel building, and one series is arranged in the safety building C to meet physical isolation. Each 100% capacity RBS series consists of a boric acid tank, a piston pump, and connecting pipelines. The piston pump injects the boric acid solution into a loop of the RCP through the containment isolation valve and the RCPB isolation valve. The RBS pump needs to be periodically tested. The periodic test pipeline is a full-flow pipeline, which is connected from the pump outlet to the corresponding boric acid tank. The pump can also periodically stir the boric acid tank through this return pipeline. Since it is a piston pump with a high head, a safety valve is provided at the pump outlet for overpressure protection. The part of the RBS injection pipeline in the reactor building is insulated and traced to prevent boron crystallization. A flow measurement instrument is provided at the pump outlet, and the operator can monitor whether the flow rate meets the minimum flow rate for safe boronization in the main control room. If the requirement is not met, this series can be isolated. During the normal operation of the power plant, the RBS system is in a standby state or undergoes periodic tests. In the ATWS accident condition, the RBS system automatically starts for emergency boron injection.

[0005] In the AP1000 unit, the emergency makeup water and boration are carried out by the passive core makeup and boration subsystem of the passive core cooling system (PXS) in the dedicated safety facilities. This system mainly consists of two core makeup tanks (CMT), two accumulator tanks, and a refueling water storage tank inside the containment. The two CMTs are located above the reactor coolant loops. During normal operation, the makeup tanks are filled with cold boric acid water. Each CMT is connected to the direct injection line of the pressure vessel through a letdown injection line, and there is another pressure balance line connected to the cold leg of the coolant system. Under normal conditions, the pressure in the CMT is the same as that in the reactor coolant system (RCS). The temperature of the boric acid water in the CMT is lower than that of the cold leg. Under accident conditions, the driving force generated by gravity and the density difference caused by temperature injects boric acid water into the reactor coolant system to carry out makeup water and boration.

[0006] For the above three units, CPR, Hualong, and AP1000, the system equipment and pipelines all consider redundancy. While ensuring safety, it leads to problems such as excessive equipment, cumbersome corresponding control strategies, complex pipelines, large occupied space, and being not conducive to the miniaturization of the reactor type. And during the normal operation of the unit, the relevant power equipment is in a shutdown state. If the shutdown time is too long, regular tests and inspections are required. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a pipeline structure for the charging pump of a nuclear power plant that also takes into account emergency boric acid injection.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a pipeline structure for the charging pump of a nuclear power plant that also takes into account emergency boric acid injection, including a main charging pipeline, a circulation pipeline, a main output pipeline, and a main boric acid injection pipeline. The main charging pipeline is sequentially connected with a first isolation valve, a main boric acid injection pipeline, a first charging pump, the main output pipeline, a second isolation valve, and a volume control tank; the circulation pipeline is sequentially connected with a concentrated boric acid tank, the main output pipeline, a third isolation valve, a circulation pump, and the concentrated boric acid tank to form a circulation pipeline;

[0009] A fourth isolation valve is also connected to the main output pipeline, and a fifth isolation valve is also connected to the main boric acid injection pipeline;

[0010] During normal water filling, the first isolation valve, the first charging pump, and the second isolation valve are in an open state, and the fourth isolation valve and the fifth isolation valve are in a closed state; at the same time, the circulation pump and the third isolation valve are in an open state or intermittently opened, so that the boric acid solution in the concentrated boric acid tank continuously circulates or intermittently circulates in the circulation pipeline;

[0011] During emergency boric acid injection, the first isolation valve, the second isolation valve, the circulation pump, and the third isolation valve are in a closed state, and the fourth isolation valve, the first charging pump, and the fifth isolation valve are in an open state.

[0012] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a secondary charging pipeline, a second charging pump, a sixth isolation valve, and a seventh isolation valve. The sixth isolation valve, the second charging pump, and the seventh isolation valve are sequentially connected to the secondary charging pipeline and are arranged in parallel with the first charging pump.

[0013] The secondary charging pipeline is arranged between the first isolation valve and the second isolation valve, and both ends of the secondary charging pipeline are connected to the main charging pipeline.

[0014] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a secondary boron injection pipeline and an eighth isolation valve. The eighth isolation valve is connected to the secondary boron injection pipeline. The secondary boron injection pipeline is arranged between the sixth isolation valve and the second charging pump and is connected to the secondary charging pipeline.

[0015] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a secondary output pipeline and a ninth isolation valve. The secondary output pipeline is sequentially connected to the main output pipeline, the ninth isolation valve, and the main output pipeline, and the ninth isolation valve is arranged in parallel with the fourth isolation valve.

[0016] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a main degassing pipeline and a tenth isolation valve. The main degassing pipeline is sequentially connected to the volume control tank, the tenth isolation valve, and the main charging pipeline.

[0017] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a secondary degassing pipeline. Both ends of the secondary degassing pipeline are respectively connected to the main degassing pipeline and the secondary charging pipeline, and the secondary degassing pipeline is connected in series with the tenth isolation valve.

[0018] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a first flowmeter. The first flowmeter is connected to the main boron injection pipeline.

[0019] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a second flowmeter. The second flowmeter is connected to the secondary boron injection pipeline.

[0020] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes an eleventh isolation valve. The eleventh isolation valve is arranged between the secondary boron injection pipeline and the main charging pipeline and is connected to the secondary charging pipeline.

[0021] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant also taking into account emergency boron injection further includes a medicine box, a medicine injection pipeline, and a twelfth isolation valve. The medicine injection pipeline is sequentially connected to the medicine box, the twelfth isolation valve, and the main charging pipeline, and the medicine injection pipeline is arranged between the first charging pump and the second isolation valve.

[0022] By implementing the present utility model, the following beneficial effects are achieved:

[0023] The pipeline structure of the charging pump of the nuclear power plant of the present utility model also taking into account emergency boron injection includes a main charging pipeline, a circulation pipeline, a main output pipeline, and a main boron injection pipeline. The main charging pipeline is sequentially connected with a first isolation valve, a main boron injection pipeline, a first charging pump, the main output pipeline, a second isolation valve, and a volume control tank; the circulation pipeline is sequentially connected to a concentrated boron tank, the main output pipeline, a third isolation valve, a circulation pump, and the concentrated boron tank to form a circulation pipeline; a fourth isolation valve is further connected to the main output pipeline, and a fifth isolation valve is further connected to the main boron injection pipeline; during normal water filling, the first isolation valve, the first charging pump, and the second isolation valve are in an open state, and the fourth isolation valve and the fifth isolation valve are in a closed state; meanwhile, the circulation pump and the third isolation valve are in an open state or intermittently opened, so that the boric acid solution in the concentrated boron tank continuously circulates or intermittently circulates in the circulation pipeline; during emergency boron injection, the first isolation valve, the second isolation valve, the circulation pump, and the third isolation valve are in a closed state, and the fourth isolation valve, the first charging pump, and the fifth isolation valve are in an open state. The first charging pump is used to perform the emergency boron injection function. During normal water filling of the unit, the first charging pump is in an open state, and the circulation pump is in an open state or intermittently opened, avoiding long-term standby of power equipment and reducing the investment in relevant regular tests and inspections. During normal water filling, the water in the volume control tank is filled into the unit through the main charging pipeline; during emergency boron injection, the boric acid solution in the concentrated boron tank sequentially flows through part of the circulation pipeline, the main output pipeline, the main charging pipeline, and the main boron injection pipeline for emergency boron injection. The equipment utilization rate is high, and some pipelines can perform different functions under different working conditions, making the layout space more compact and facilitating the miniaturization of the reactor type. Description of the Drawings

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0025] Figure 1 is a schematic diagram of the pipeline structure of the charging pump of the nuclear power plant of the present utility model in one embodiment also taking into account emergency boron injection. Detailed Embodiments

[0026] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed embodiments of the present utility model will now be described in detail with reference to the drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model 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 a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a chemical connection; it can be a direct connection or an indirect connection 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 by specific circumstances.

[0030] See also Figure 1 An embodiment of the utility model discloses a pipeline structure for a charging pump in a nuclear power plant and emergency boron injection, which can improve the problems of increased equipment, low space utilization, and redundancy of pipelines and equipment while ensuring the safety and reliability of the system.

[0031] The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection includes a main charging pipeline 1, a circulation pipeline 3, a main output pipeline 4, and a main boron injection pipeline 6. The main charging pipeline 1 is successively connected with a first isolation valve V1, the main boron injection pipeline 6, a first charging pump P1, the main output pipeline 4, a second isolation valve V2, and a volume control tank 8. The volume control tank 8 is used to absorb the volume change of the primary coolant circuit that the pressurizer cannot absorb and degas, and provide water source for the first charging pump P1. The main charging pipeline 1 is used to fill water into the reactor coolant system. The circulation pipeline 3 is successively connected with a concentrated boron tank 9, the main output pipeline 4, a third isolation valve V3, a circulation pump P3, and the concentrated boron tank 9 to form a circulation pipeline. The concentrated boron tank 9 is filled with boric acid solution with a concentration of 8000 ppm to 9000 ppm. The circulation pipeline 3 is used to circulate the boric acid solution. A fourth isolation valve V4 is also connected to the main output pipeline 4, and the main output pipeline 4 is used to output the boric acid solution to the main charging pipeline 1. A fifth isolation valve V5 is also connected to the main boron injection pipeline 6, and the main boron injection pipeline 6 is used to inject boric acid solution into the primary coolant circuit.

[0032] During normal water filling, that is, during the normal operation of the unit, the first isolation valve V1, the first charging pump P1, and the second isolation valve V2 are in the normally open state, and the fourth isolation valve V4 and the fifth isolation valve V5 are in the normally closed state. The water in the volume control tank 8 can be filled into the reactor coolant system through the main charging pipeline 1. At the same time, the circulation pump P3 and the third isolation valve V3 are in the normally open state or intermittently opened state, so that the boric acid solution in the concentrated boron tank 9 continuously circulates or intermittently circulates in the circulation pipeline 3. Preferably, the circulation pump P3 adopts a centrifugal pump, which is used for the recirculation of the boric acid solution in the concentrated boron tank 9 to ensure the uniformity of the boric acid solution and avoid its crystallization. It can be understood that in some embodiments, the third isolation valve V3 can be in the normally open state, and the circulation pump P3 can be in the normally open state or intermittently opened state. In other embodiments, the third isolation valve V3 can be in the intermittently opened state, and the circulation pump P3 is synchronously in the intermittently opened state.

[0033] During emergency boron injection, that is, under the accident condition of ATWS, the first isolation valve V1, the second isolation valve V2, the circulation pump P3, and the third isolation valve V3 are in the normally closed state, and the water filling can be stopped. The fourth isolation valve V4, the first charging pump P1, and the fifth isolation valve V5 are in the normally open state. The boric acid solution in the concentrated boron tank 9 flows through part of the circulation pipeline 3, the main output pipeline 4, the main charging pipeline 1, and the main boron injection pipeline 6 in sequence through the first charging pump P1 for emergency boron injection.

[0034] It can be understood that to improve the line safety, the number of the first isolation valve V1 and the second isolation valve V2 can be set to one, two, or more respectively, and the present utility model does not make any limitation here.

[0035] The pipeline structure of the charging pump in the nuclear power plant of the present utility model that also serves as an emergency boron injection function. During the normal operation of the unit, the first charging pump P1 does not perform the emergency boron injection function and is only used to normally fill water into the reactor coolant system. Under the accident condition of ATWS, the first charging pump P1 serves as the power source for emergency boron injection and also serves as an emergency boron injection pump, and can inject sufficient boric acid solution into the primary loop to ensure subcriticality of the reactor core, avoid the occurrence of severe accidents, and improve the safety of the nuclear power unit.

[0036] In some embodiments, the pipeline structure of the charging pump in the nuclear power plant that also serves as an emergency boron injection function further includes a secondary charging pipeline 2, a second charging pump P2, a sixth isolation valve V6, and a seventh isolation valve V7. The sixth isolation valve V6, the second charging pump P2, and the seventh isolation valve V7 are sequentially connected on the secondary charging pipeline 2 and are arranged in parallel with the first charging pump P1. The secondary charging pipeline 2 is arranged between the first isolation valve V1 and the second isolation valve V2, and both ends of the secondary charging pipeline 2 are connected to the main charging pipeline 1. The second charging pump P2 serves as a standby pump for water filling. During the normal water filling period of the first charging pump P1, the second charging pump P2 is in a normally closed state, and the sixth isolation valve V6 and the seventh isolation valve V7 are in a normally open state. If the first charging pump P1 fails or has other problems resulting in insufficient transportation capacity, the second charging pump P2 is opened to assist in water filling. It can be understood that the second charging pump P2 can also serve as the power source for emergency boron injection. The sixth isolation valve V6 is closed, and the eighth isolation valve V8 and the second charging pump P2 are opened to assist in emergency boron injection.

[0037] Preferably, in order to prevent backflow, a first check valve V13 is provided between the first charging pump P1 and the main boron injection pipeline 6, and a second check valve V14 is provided between the second charging pump P2 and the seventh isolation valve V7.

[0038] In some embodiments, the pipeline structure of the charging pump in the nuclear power plant that also serves as an emergency boron injection function further includes a secondary boron injection pipeline 7 and an eighth isolation valve V8. The eighth isolation valve V8 is connected to the secondary boron injection pipeline 7. The secondary boron injection pipeline 7 is arranged between the sixth isolation valve V6 and the second charging pump P2 and is connected to the secondary charging pipeline 2. The secondary boron injection pipeline 7 serves as a standby pipeline for emergency boron injection. During the normal operation of the unit, the eighth isolation valve V8 is in a normally closed state.

[0039] In some embodiments, in order to strengthen the prevention of single valve failure, the pipeline structure of the charging pump in the nuclear power plant that also serves as the emergency boron injection line further includes an eleventh isolation valve V11. The eleventh isolation valve V11 is arranged between the secondary boron injection pipeline 7 and the main charging pipeline 1 and is connected to the secondary charging pipeline 2. During normal operation and when starting the first charging pump P1 for water filling, the sixth isolation valve V6 and the eleventh isolation valve V11 are in the normally open state. During normal operation and when starting the second charging pump P2 for water filling, since the sixth isolation valve V6 and the eleventh isolation valve V11 remain in the normally open state, the second charging pump P2 can be quickly started for water injection. Under the accident condition of ATWS and when starting the first charging pump P1 or the second charging pump P2 for emergency boron injection, the sixth isolation valve V6 and the eleventh isolation valve V11 are in the normally closed state. Or the opening and closing states of the sixth isolation valve V6 and the eleventh isolation valve V11 are determined according to actual needs.

[0040] In some embodiments, in order to monitor the boron injection situation, the pipeline structure of the charging pump in the nuclear power plant that also serves as the emergency boron injection line further includes a first flowmeter M1 and a second flowmeter M2. The first flowmeter M1 is connected to the main boron injection pipeline 6, and the second flowmeter M2 is connected to the secondary boron injection pipeline 7.

[0041] In some embodiments, the pipeline structure of the charging pump in the nuclear power plant that also serves as the emergency boron injection line further includes a secondary output pipeline 5 and a ninth isolation valve V9. The secondary output pipeline 5 is sequentially connected to the main output pipeline 4, the ninth isolation valve V9, and the main output pipeline 4, and the ninth isolation valve V9 is arranged in parallel with the fourth isolation valve V4. The secondary output pipeline 5 serves as a standby pipeline for outputting boric acid solution, and the ninth isolation valve V9 is opened or closed according to needs. During normal operation of the unit, the ninth isolation valve V9 is in the normally closed state.

[0042] In some embodiments, the pipeline structure of the charging pump in the nuclear power plant that also serves as the emergency boron injection line further includes a main degassing pipeline 10 and a tenth isolation valve V10. The main degassing pipeline 10 is sequentially connected to the volume control tank 8, the tenth isolation valve V10, and the main charging pipeline 1. The tenth isolation valve V10 is opened or closed according to whether degassing is required. Preferably, the main degassing pipeline 10 is connected to the upper part or the top position of the volume control tank 8. The main degassing pipeline 10 is used for degassing the main charging pipeline 1. The number of the tenth isolation valves V10 can include one, two, or more.

[0043] In some embodiments, the pipeline structure of the charging pump in the nuclear power plant that also serves as the emergency boron injection line further includes a secondary degassing pipeline 11. Both ends of the secondary degassing pipeline 11 are respectively connected to the main degassing pipeline 10 and the secondary charging pipeline 2, and the secondary degassing pipeline 11 is connected in series with the tenth isolation valve V10. The secondary degassing pipeline 11 is used for degassing the secondary charging pipeline 2.

[0044] In some embodiments, the pipeline structure of the charging pump of the nuclear power plant also taking into account emergency boron injection further includes a medicine box 12, a medicine injection pipeline 13, and a twelfth isolation valve V12. The medicine injection pipeline 13 is sequentially connected to the medicine box 12, the twelfth isolation valve V12, and the main charging pipeline 1, and the medicine injection pipeline 13 is arranged between the first charging pump P1 and the second isolation valve V2.

[0045] It can be understood that the first isolation valve V1, the second isolation valve V2, the third isolation valve V3, the fourth isolation valve V4, the fifth isolation valve V5, the sixth isolation valve V6, the seventh isolation valve V7, the eighth isolation valve V8, the ninth isolation valve, the tenth isolation valve V10, the eleventh isolation valve V11, the eleventh isolation valve V11, and the twelfth isolation valve V12 can be electric isolation valves or manual isolation valves respectively, and can be set according to actual needs. When operation is required, they can be opened and closed manually respectively. Preferably, in this embodiment, the seventh isolation valve V7 is a manual valve.

[0046] By implementing the present utility model, the following beneficial effects are achieved:

[0047] For the pipeline structure of the charging pump of the nuclear power plant of the present utility model that also takes into account emergency boron injection, the first charging pump P1 is used to perform the emergency boron injection function. When the unit is normally filled with water, the first charging pump P1 is in a normally open state, and the circulation pump P3 is in a normally open state or intermittently opened state, avoiding long-term standby of power equipment and reducing the investment in relevant regular tests and inspections. When filling water normally, the water in the volume control tank 8 is filled into the unit through the main charging pipeline 1; during emergency boron injection, the boric acid solution in the concentrated boron tank 9 flows through part of the circulation pipeline 3, the main output pipeline 4, the main charging pipeline 1, and the main boron injection pipeline 6 in sequence for emergency boron injection. The equipment utilization rate is high, and some pipelines can perform different functions under different working conditions, making the layout space more compact and facilitating the miniaturization of the reactor type.

[0048] It can be understood that the above embodiments only represent the preferred implementation modes of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model, that is, the embodiments described in "in some embodiments" can be freely combined with any of the above or below embodiments; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A pipeline structure for the charging pump of a nuclear power plant that also serves as an emergency boron injection line, characterized in that, It includes a main charging pipeline (1), a circulation pipeline (3), a main output pipeline (4) and a main boron injection pipeline (6). The main charging pipeline (1) is successively connected with a first isolation valve (V1), the main boron injection pipeline (6), a first charging pump (P1), the main output pipeline (4), a second isolation valve (V2) and a volume control tank (8); the circulation pipeline (3) is successively connected with a concentrated boron tank (9), the main output pipeline (4), a third isolation valve (V3), a circulation pump (P3) and the concentrated boron tank (9) to form a circulation pipeline; A fourth isolation valve (V4) is also connected to the main output pipeline (4), and a fifth isolation valve (V5) is also connected to the main boron injection pipeline (6); During normal water filling, the first isolation valve (V1), the first charging pump (P1) and the second isolation valve (V2) are in an open state, and the fourth isolation valve (V4) and the fifth isolation valve (V5) are in a closed state; meanwhile, the circulation pump (P3) and the third isolation valve (V3) are in an open state or intermittently opened, so that the boric acid solution in the concentrated boron tank (9) continuously circulates or intermittently circulates in the circulation pipeline (3); During emergency boron injection, the first isolation valve (V1), the second isolation valve (V2), the circulation pump (P3) and the third isolation valve (V3) are in a closed state, and the fourth isolation valve (V4), the first charging pump (P1) and the fifth isolation valve (V5) are in an open state.

2. The pipeline structure of the charging pump of the nuclear power plant that also serves as the emergency boron injection, as claimed in claim 1, is characterized in that The pipeline structure of the nuclear power plant charging pump taking into account emergency boron injection further includes a secondary charging pipeline (2), a second charging pump (P2), a sixth isolation valve (V6) and a seventh isolation valve (V7). The sixth isolation valve (V6), the second charging pump (P2) and the seventh isolation valve (V7) are successively connected to the secondary charging pipeline (2) and are arranged in parallel with the first charging pump (P1); The secondary charging pipeline (2) is arranged between the first isolation valve (V1) and the second isolation valve (V2), and both ends of the secondary charging pipeline (2) are connected to the main charging pipeline (1).

3. The pipeline structure of the charging pump of the nuclear power plant that also serves as an emergency boron injection line according to claim 2, wherein The pipeline structure of the nuclear power plant charging pump taking into account emergency boron injection further includes a secondary boron injection pipeline (7) and an eighth isolation valve (V8). The eighth isolation valve (V8) is connected to the secondary boron injection pipeline (7). The secondary boron injection pipeline (7) is arranged between the sixth isolation valve (V6) and the second charging pump (P2) and is connected to the secondary charging pipeline (2).

4. The pipeline structure of the charging pump of a nuclear power plant that also serves as an emergency boron injection line according to claim 1, characterized in that, The pipeline structure of the nuclear power plant charging pump taking into account emergency boron injection further includes a secondary output pipeline (5) and a ninth isolation valve (V9). The secondary output pipeline (5) successively connects the main output pipeline (4), the ninth isolation valve (V9) and the main output pipeline (4), and the ninth isolation valve (V9) is arranged in parallel with the fourth isolation valve (V4).

5. The pipeline structure of the charging pump of the nuclear power plant that also serves as an emergency boron injection line according to claim 2, characterized in that, The pipeline structure of the nuclear power plant charging pump taking into account emergency boron injection further includes a main degassing pipeline (10) and a tenth isolation valve (V10). The main degassing pipeline (10) successively connects the volume control tank (8), the tenth isolation valve (V10) and the main charging pipeline (1).

6. The pipeline structure of the charging pump of a nuclear power plant that also serves as an emergency boron injection line according to claim 5, characterized in that, The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a secondary degassing pipeline (11). Two ends of the secondary degassing pipeline (11) are respectively connected to the main degassing pipeline (10) and the secondary charging pipeline (2), and the secondary degassing pipeline (11) is connected in series with the tenth isolation valve (V10).

7. The pipeline structure of the nuclear power plant charging pump that also serves as an emergency boron injection line according to claim 1, characterized in that, The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a first flowmeter (M1). The first flowmeter (M1) is connected to the main boron injection pipeline (6).

8. The pipeline structure of the charging pump of a nuclear power plant that also serves as an emergency boron injection line according to claim 3, characterized in that, The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a second flowmeter (M2). The second flowmeter (M2) is connected to the secondary boron injection pipeline (7).

9. The pipeline structure of the nuclear power plant's charging pump that also serves as an emergency boron injection line according to claim 3, characterized in that, The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes an eleventh isolation valve (V11). The eleventh isolation valve (V11) is arranged between the secondary boron injection pipeline (7) and the main charging pipeline (1), and is connected to the secondary charging pipeline (2).

10. The pipeline structure for the upper charging pump of a nuclear power plant to concurrently serve as an emergency boron injection line according to any one of claims 1-9, characterized in that, The pipeline structure of the charging pump of the nuclear power plant that also serves for emergency boron injection further includes a medicine tank (12), a medicine injection pipeline (13) and a twelfth isolation valve (V12). The medicine injection pipeline (13) is sequentially connected to the medicine tank (12), the twelfth isolation valve (V12) and the main charging pipeline (1), and the medicine injection pipeline (13) is arranged between the first charging pump (P1) and the second isolation valve (V2).

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