CN220709964U

CN220709964U - Reactor boron recovery system

Info

Publication number: CN220709964U
Application number: CN202322159045.0U
Authority: CN
Inventors: 陈文彬; 梁维江; 张雷
Original assignee: Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Current assignee: Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Priority date: 2023-08-10
Filing date: 2023-08-10
Publication date: 2024-04-02
Anticipated expiration: 2033-08-10

Abstract

The utility model relates to the technical field of reactor boron and water supply systems, and discloses a reactor boron recovery system which comprises a middle box circulation loop and a boron injection device. The boron injection device comprises a container, a stirrer for stirring boron solution in the container, a pump, a first connecting pipe and a second connecting pipe; the boron solution in the container is injected into the middle box circulation loop through the first connecting pipe and the second connecting pipe, and the boron solution in the container enters the first loop after being diluted by the middle box circulation loop; therefore, the boron abundance of a loop can be indirectly regulated through the boron injection device and the middle box circulation loop in the overhaul period or the daily period, so that various potential safety hazards caused by directly injecting high-concentration enriched boron solution into a heap during the overhaul period are avoided; in the daily period, a preposed dilution link of a middle box circulation loop is added, and the controllability of a primary loop boron abundance adjusting process is better; the stirrer may be used to stir the boron solution in the vessel to accelerate the dissolution of solid boron and prevent precipitation.

Description

Reactor boron recovery system

Technical Field

The utility model relates to the technical field of reactor boron and water supply systems, in particular to a reactor boron recovery system.

Background

In a nuclear power plant, as a unit operates, a condition that the primary boron abundance of a loop is reduced occurs, and thus the safety margin is reduced. To solve this problem, it is necessary to implant a boron solution into a circuit to increase the boron abundance of the circuit. In the prior art, there are two ways to increase the abundance of primary boron: directly injecting high-concentration boron-enriched solution into the heap tank during overhaul and when the heap tank is full of water; during the day, a high concentration boron-rich solution is injected into the reactor boron and water make-up system (REA). The reactor boron and water make-up system is directly connected to a circuit and provides boron solution directly to the circuit.

However, during the overhaul period, the safety hazards such as personnel falling and foreign matter introduction into the heap tank exist when the high-concentration boron-enriched solution is directly injected into the heap tank; during daily life, the reactor boron and water make-up system directly supplies the boron solution to the primary loop, and the direct injection of high-abundance boron solution into the reactor boron and water make-up system easily causes the boron abundance of the reactor boron and water make-up system to exceed the standard, thereby affecting the reactivity control of the primary loop, and the poor controllability of the primary loop boron abundance adjustment process needs improvement.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a reactor boron recovery system.

The technical scheme adopted for solving the technical problems is as follows: the reactor boron recovery system comprises an intermediate tank circulation loop and a boron injection device connected with the intermediate tank circulation loop;

the boron injecting device comprises a container for containing boron solution, a stirrer for stirring the boron solution in the container, a pump, a first connecting pipe and a second connecting pipe;

the stirrer is arranged on the container;

the pump is arranged on one side of the container;

the first connecting pipe is connected between the container and the pump; the second connecting pipe is connected between the pump and the intermediate tank circulation loop.

Preferably, the intermediate tank circulation loop comprises an intermediate tank circulation pump, and the second connecting pipe is connected between the pump and an outlet of the intermediate tank circulation pump;

the boron injection device further comprises a first control valve arranged on the second connecting pipe.

Preferably, the boron implantation device further comprises a moving base;

the movable base comprises a main body and a roller connected to the bottom of the main body;

the container is disposed on the body.

Preferably, the body is a frame structure.

Preferably, the first connection tube comprises a first portion and a second portion;

the first part of the first connecting pipe and the container are integrally formed;

the second portion of the first connecting tube is connected between the first portion of the first connecting tube and the pump.

Preferably, the boron injecting apparatus further comprises a second control valve connected between the first portion and the second portion of the first connecting tube.

Preferably, the second portion of the first connection tube is a corrugated hose.

Preferably, the bottom of the container is provided with a water outlet; the boron injection device also comprises a drain pipe and a drain valve; one end of the drain pipe is connected with a drain outlet of the container.

Preferably, the first connection tube is a corrugated hose.

Preferably, the second connection pipe is a metal pipe.

The utility model has at least the following beneficial effects: the boron solution in the container is injected into the middle box circulation loop through the first connecting pipe and the second connecting pipe, and the boron solution in the container enters a loop through other systems after being diluted by the middle box circulation loop; therefore, the boron abundance of a loop can be indirectly regulated through the boron injection device and the middle box circulation loop in the overhaul period or the daily period, so that various potential safety hazards caused by directly injecting high-concentration enriched boron solution into a heap during the overhaul period are avoided; in the daily period, a preposed dilution link of a middle box circulation loop is added, and the controllability of a primary loop boron abundance adjusting process is better; the stirrer may be used to stir the boron solution in the vessel to accelerate the dissolution of solid boron and prevent precipitation.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a boron injection apparatus of a reactor boron recovery system according to an embodiment of the present utility model;

fig. 2 is a schematic system connection diagram of a reactor boron recovery system according to an embodiment of the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

The terms "first," "second," and the like are used merely for convenience in describing the present technology and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," or the like may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Fig. 1-2 illustrate a reactor boron recovery system (TEP) including a middle tank circulation loop 9, a boron injection device connected to the middle tank circulation loop 9, in accordance with an embodiment of the present utility model. The boron injecting device comprises a container 1, a stirrer 2, a pump 3, a first connecting pipe 41 and a second connecting pipe 42. The intermediate tank circulation circuit 9 includes three intermediate storage tanks 7, one intermediate tank circulation pump 8, and piping, valves, and the like connecting the intermediate storage tanks 7 and the intermediate tank circulation pump 8.

The container 1 is used for holding a boron solution. Specifically, natural solid boron is poured into the container 1, and desalted water is injected into the container 1 to dissolve, thereby obtaining a desired boron solution. Boron solutions with different concentrations can be obtained according to different desalted water-solid boron ratios. A stirrer 2 is provided on the container 1, and the stirrer 2 is used to stir the boron solution in the container 1 to accelerate the dissolution of solid boron, prevent precipitation, and uniform the boron solution. Further, the stirrer 2 may be provided at the top of the container 1, and stirring members such as a stirring rod or a stirring paddle of the stirrer 2 may be protruded into the container 1 from the top opening of the container 1 to stir the boron solution in the container 1. The stirrer 2 may be energized by connecting a cable reel.

The pump 3 is arranged on one side of the container 1. The first connecting tube 41 is connected between the container 1 and the pump 3. A second connection pipe 42 is connected between the pump 3 and the reactor boron recovery system. The boron solution in the container 1 flows through the first connecting pipe 41 and the second connecting pipe 42 in order and then enters the intermediate tank circulation loop 9.

In the nuclear power system, REA is directly connected with a loop, and boron solution is directly supplied to the loop so as to control the reactivity of the loop; PTR is a loop auxiliary system which is connected with a loop and bears the nuclear power safety function, and ensures the durable cooling of a spent fuel element storage pool, the water injection, the drainage and the purification of a reactor refueling pool. The intermediate tank circulation loop 9 is normally a small part of TEP (reactor boron recovery system); TEP is used to store, filter, purify, etc. the boron water from a circuit, and then to inject it into other systems of the nuclear power plant for reuse in the circuit. Specifically, three intermediate storage tanks 7 of the intermediate tank circulation circuit 9 receive boron water from a circuit, and after purifying and filtering the received boron water, REA (reactor boron and water make-up system) and PTR (reactor refueling water basin and spent fuel basin cooling and treatment system) are respectively injected through related equipment and pipelines, and the process is powered by an intermediate tank circulation pump 8.

According to the utility model, a part of the TEP (terminal equipment) is modified into the middle tank circulation loop 9, and an interface is additionally arranged on the middle tank circulation loop 9 to be connected with a boron injection device, so that the boron abundance of the loop is indirectly regulated. Specifically, in a nuclear power plant, the intermediate tank circulation loop 9 is indirectly connected with a loop through other systems, for example, the intermediate tank circulation loop 9 is connected with REA through an online valve, when REA boron solution is insufficient, the relevant online valve is opened, and the intermediate tank circulation loop 9 supplements the REA with boron solution. Meanwhile, the intermediate tank circulation loop 9 is also connected with the PTR through an on-line valve, and the intermediate storage tank 7 of the intermediate tank circulation loop 9 transfers water to the equipment (PTR 001 BA) of the PTR during the overhaul of the nuclear power plant.

Therefore, during overhaul, the boron solution in the container 1 of the utility model is injected into the middle box circulation loop 9 and then enters a loop after being diluted by PTR, the boron abundance in the reactor boron recovery system and PTR can be timely detected during the overhaul, the injected boron solution is quantitatively controlled according to a boron abundance calculation formula, and after the boron solution meets the relevant standard, an on-line valve is opened to inject the diluted boron solution into the loop. Compared with the mode of directly injecting the boron solution into the heap pool, the utility model utilizes the boron injection device to inject the boron solution into the middle box circulation loop 9, adds two front dilution links of the middle box circulation loop 9 and the PTR, and realizes indirect adjustment of the boron abundance of a loop.

During daily periods (when the boron solution is needed to be replenished for a circuit except for the overhaul period), the boron solution in the container 1 of the utility model is diluted by the middle box circulation circuit 9 and then enters REA for dilution, and finally enters a circuit; and the injected boron solution can be quantitatively controlled according to a boron abundance calculation formula, and after the related standard is met, the on-line valve is opened to inject the diluted boron solution into a loop. Compared with the form of directly injecting the boron solution into REA, the boron injection device of the utility model indirectly adjusts the boron abundance of the primary loop after the boron solution is injected into the middle box circulation loop 9, and increases the front dilution link of the middle box circulation loop 9.

Therefore, a front dilution link is added to the regulation process of the boron abundance of the primary circuit during overhaul and daily period, so that the buffer space of the regulation process is increased, the controllability of the regulation process of the boron abundance of the primary circuit is better, and the risk of adverse effect on the control of the reactivity of the primary circuit is reduced.

In summary, the utility model has at least the following advantages:

the boron solution in the container 1 is injected into the middle box circulation loop 9 through the first connecting pipe 41 and the second connecting pipe 42, and the boron solution in the container 1 enters a loop through other systems after being diluted by the middle box circulation loop 9. The boron abundance of the primary loop can be indirectly regulated by the boron injection device and the middle box circulating loop 9 during the overhaul period or the daily period; various potential safety hazards caused by directly injecting high-concentration boron-enriched solution into a heap during overhaul are avoided; in the daily period, a dilution link of the middle box circulating loop 9 is added, and the controllability of a primary loop boron abundance adjusting process is better; a stirrer may be used to stir the boron solution in the container 1 to accelerate the dissolution of solid boron and prevent precipitation.

Specifically, the boron solution in the container 1 is injected into the middle tank circulation loop 9 through the first connecting pipe 41 and the second connecting pipe 42, and two front dilution links are added during overhaul, so that the boron abundance of a loop can be indirectly regulated through the boron injection device, the middle tank circulation loop 9 and the PTR in sequence, various potential safety hazards caused by directly injecting high-concentration enriched boron solution into a heap pool are avoided, and the boron abundance in the middle tank circulation loop 9 and the PTR can be detected and analyzed in time; in daily period, the boron solution in the container 1 is diluted by the middle box circulation loop 9, then enters REA to be diluted, and finally enters a loop, so that a pre-dilution link is added, and the controllability of the boron abundance adjusting process of the loop is better. The stirrer 2 may be used to stir the boron solution in the vessel 1 to accelerate the dissolution of solid boron, prevent precipitation, and homogenize the boron solution.

In the present embodiment, the intermediate tank circulation circuit 9 includes an intermediate tank circulation pump 8; a second connection pipe 42 is connected between the pump 3 and the outlet of the intermediate tank circulation pump 8. The boron injecting apparatus further includes a first control valve 51 provided on the second connection pipe 42. Further, the intermediate tank circulation circuit 9 further includes three intermediate storage tanks 7, and accordingly, the intermediate tank circulation pumps 8 are respectively connected to the respective intermediate storage tanks 7 to drive the flow of the liquid in the respective intermediate storage tanks 7. By adding an interface at the outlet of the TEP intermediate tank circulation pump 8 and connecting the second connecting pipe 42 to the outlet of the intermediate tank circulation pump 8, the boron injection device is connected to the intermediate tank circulation loop 9, and the equipment of the existing system can be reasonably utilized for reconstruction. The first control valve 51 is used for adjusting the on-off state between the second connecting pipe 42 and the middle tank circulating pump 8, and realizing the functions of isolation, flow regulation and the like.

In this embodiment, the boron implantation apparatus further includes a moving base 6. The moving base 6 includes a main body 61 and a roller 62 coupled to the bottom of the main body 61. The container 1 is provided on the main body 61 so as to facilitate the movement and transportation of the boron injecting device as the main body 61 is movable.

Further, the main body 61 is of a frame structure, thereby providing reliable support for the boron implantation device, minimizing the overall weight of the main body 61, facilitating the manufacture and transportation of the mobile base 6, and the like.

In the present embodiment, the first connection pipe 41 includes a first portion and a second portion. The first portion of the first connecting tube 41 is integrally formed with the container 1. The second portion of the first connecting tube 41 is connected between the first portion of the first connecting tube 41 and the pump 3.

Further, the boron implantation apparatus further includes a second control valve 52. The second control valve 52 is connected between the first portion and the second portion of the first connection pipe 41. The second control valve 52 includes connecting flanges on opposite sides thereof. Thereby, the connection flanges on opposite sides of the second control valve 52 are connected to the first and second portions of the first connection pipe 41, respectively.

Further, the second portion of the first connecting tube 41 is a bellows. The first portion of the first connecting tube 41 is integrally formed with the container 1, which may be a rigid tube. The first connecting pipe 41 is located at the inlet side of the pump 3 for connecting the container 1 with the pump 3, and has a small hydraulic pressure therein, so that a bellows hose can be preferably used for saving cost and facilitating disassembly.

Of course, in other embodiments, the first connecting tube 41 may be a separate unit. Specifically, the container 1 is provided with a liquid outlet, and the liquid outlet may be provided on a side surface of the container 1 and near a bottom of the container 1, so as to facilitate liquid discharge. The first connecting pipe 41 is integrally connected between the liquid outlet of the container 1 and the pump 3. Similarly, the first connecting tube 41 may be a corrugated tube, that is, the first connecting tube 41 is a corrugated tube as a whole.

Further, the second connection pipe 42 may be a metal pipe, unlike the first connection pipe 41. Since the second connection pipe 42 is located at the outlet side of the pump 3 and is used for communicating the pump 3 with the intermediate tank circulating pump 8 of the intermediate tank circulating loop 9, when the pump 3 works, the boron solution needs to be pumped into the reactor boron recovery system, and a situation of outputting higher liquid pressure exists, so that the second connection pipe 42 can be set as a metal pipe to meet the pressure-bearing requirement considering that higher pressure can be generated at the second connection pipe 42.

It should be noted that in different embodiments, there may be a plurality of cases: the first connection pipe 41 is a corrugated hose, and the second connection pipe 42 is not a metal pipe; alternatively, the first connection pipe 41 is not a corrugated hose, and the second connection pipe 42 is a metal pipe; alternatively, the first connection pipe 41 may be a corrugated hose, and the second connection pipe 42 may be a metal pipe.

In this embodiment, the bottom of the container 1 is provided with a drain opening. The reactor boron recovery system also comprises a drain pipe and a drain valve. One end of the drain pipe is connected with the drain outlet of the container 1, and the other end is communicated with the atmosphere. By controlling the opening and closing of the drain valve, the liquid in the container 1 is discharged from the drain pipe, and the container 1 can be conveniently and rapidly emptied when needed.

In this embodiment, the pump 3 is a pneumatic piston pump. The pneumatic piston pump has the functions of explosion prevention, corrosion resistance, precipitation prevention, low noise, energy conservation and the like. Of course, in other embodiments, other types of pumps 3 may be employed.

In this embodiment, the volume of the container 1 is 1m ³ . The volume of the container 1 was 1m by theoretical analysis and actual measurement ³ The method can meet the needs of most cases of a nuclear power plant on site. Of course, in other embodiments, the volume of the vessel 1 may be adjusted accordingly, depending on the particular nuclear power plant site situation and requirements.

In this embodiment, the container 1 is cylindrical. Of course, in other embodiments, the container 1 may be other shapes.

It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The reactor boron recovery system is characterized by comprising an intermediate tank circulation loop (9) and a boron injection device connected with the intermediate tank circulation loop (9);

the boron injection device comprises a container (1) for containing boron solution, a stirrer (2) for stirring the boron solution in the container (1), a pump (3), a first connecting pipe (41) and a second connecting pipe (42);

the stirrer (2) is arranged on the container (1);

the pump (3) is arranged at one side of the container (1);

the first connecting tube (41) is connected between the container (1) and the pump (3); the second connecting pipe (42) is connected between the pump (3) and the intermediate tank circulation circuit (9).

2. The reactor boron recovery system according to claim 1, wherein the intermediate tank circulation loop (9) comprises an intermediate tank circulation pump (8), the second connection pipe (42) being connected between the pump (3) and an outlet of the intermediate tank circulation pump (8);

the boron injection device further comprises a first control valve (51) arranged on the second connecting pipe (42).

3. The reactor boron recovery system of claim 1, wherein the boron implantation apparatus further comprises a mobile base (6);

the movable base (6) comprises a main body (61) and a roller (62) connected to the bottom of the main body (61);

the container (1) is arranged on the main body (61).

4. A reactor boron recovery system according to claim 3, wherein the body (61) is a frame structure.

5. The reactor boron recovery system of claim 1, wherein the first connection tube (41) comprises a first portion and a second portion;

a first portion of the first connecting tube (41) is integrally formed with the container (1);

the second part of the first connecting tube (41) is connected between the first part of the first connecting tube (41) and the pump (3).

6. The reactor boron recovery system of claim 5, wherein the boron injection apparatus further comprises a second control valve (52), the second control valve (52) being connected between the first portion and the second portion of the first connection tube (41).

7. The reactor boron recovery system of claim 5, wherein the second portion of the first connection tube (41) is a corrugated hose.

8. The reactor boron recovery system according to any one of claims 1 to 7, wherein the bottom of the vessel (1) is provided with a drain; the boron injection device also comprises a drain pipe and a drain valve; one end of the drain pipe is connected with a drain outlet of the container (1).

9. The reactor boron recovery system of any one of claims 1 to 7, wherein the first connection tube (41) is a corrugated hose.

10. The reactor boron recovery system of any one of claims 1 to 7, wherein the second connecting tube (42) is a metal tube.