阅读说明：本技术 可溶中子毒物的加料装置 (Feeding device for soluble neutron poison ) 是由 陈琪 吴志强 侯留东 陈勇 李思凡 赵启桐 逯迎春 于 2020-11-20 设计创作，主要内容包括：本发明公开了一种可溶中子毒物的加料装置,包括：配制槽；计量槽,包括：计量槽槽体、核测量仪,计量槽槽体与配制槽连接,核测量仪用于通过核物理的方法测量计算计量槽槽体内的可溶中子毒物的浓度；控制器,用于接收核测量仪测量计算的可溶中子毒物的浓度,根据化学法检测到的计量槽槽体内的可溶中子毒物浓度、核测量仪测量计算计量槽槽体内的可溶中子毒物的浓度,控制计量槽槽体出料口与反应器之间的连接管线上的第一阀门的开闭。本发明采用可溶中子毒物的加料装置控制核临界安全,提高了反应器的处理能力,降低甚至解除核临界安全对设备几何尺寸的限制,这将有利于降低设备室和热室的高度,降低厂房投资、运行成本。(The invention discloses a feeding device for soluble neutron poison, which comprises: preparing a groove; a metering tank, comprising: the system comprises a metering tank body and a nuclear measuring instrument, wherein the metering tank body is connected with a preparation tank, and the nuclear measuring instrument is used for measuring and calculating the concentration of soluble neutron poison in the metering tank body by a nuclear physics method; and the controller is used for receiving the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument, controlling the opening and closing of the first valve on the connecting pipeline between the discharge port of the metering tank body and the reactor according to the concentration of the soluble neutron poison in the metering tank body detected by a chemical method and the concentration of the soluble neutron poison in the metering tank body calculated by the nuclear measuring instrument. The invention adopts the feeding device of soluble neutron poison to control the nuclear critical safety, improves the processing capacity of the reactor, reduces and even eliminates the limitation of the nuclear critical safety on the geometric dimension of the equipment, which is beneficial to reducing the heights of the equipment chamber and the hot chamber and reducing the factory building investment and the operation cost.)

1. A soluble neutron poison loading apparatus, comprising:

the preparation tank is used for preparing a soluble neutron poison solution;

a metering tank, comprising: the system comprises a metering tank body and a nuclear measuring instrument connected with the metering tank body and used for detecting the concentration of soluble neutron poison in the metering tank body, wherein the metering tank body is connected with a preparation tank, the nuclear measuring instrument is used for measuring and calculating the concentration of the soluble neutron poison in the metering tank body by a nuclear physics method, and a discharge port of the metering tank body for feeding materials to a reactor is arranged on the metering tank body;

and the controller is used for receiving the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument, calculating the concentration of the soluble neutron poison in the measuring tank body according to the concentration of the soluble neutron poison in the measuring tank body detected by a chemical method and the concentration of the soluble neutron poison in the measuring tank body measured and calculated by the nuclear measuring instrument, and controlling the opening and closing of a first valve on a connecting pipeline between the discharge port of the measuring tank body and the reactor.

2. The soluble neutron poison charging device according to claim 1, wherein the controller is further configured to control the opening and closing of the second valve on the connection pipeline between the preparation tank and the body of the metering tank according to the concentration of the soluble neutron poison in the preparation tank detected by a chemical method, and the controller controls the opening of the second valve if the concentration of the soluble neutron poison in the preparation tank reaches a preset concentration.

3. The apparatus according to claim 2, wherein the controller is configured to perform at least two sampling analyses based on the chemical method to determine the concentration of the soluble neutron poison in the dispensing tank, and the results of the sampling analyses are uniform.

4. The device for feeding a soluble neutron poison according to any one of claims 1 to 3, wherein the controller controls the first valve to open if the concentration of the soluble neutron poison in the tank body of the metering tank detected by a chemical method and the concentration of the soluble neutron poison calculated by the nuclear measuring instrument are both preset concentrations.

5. The apparatus according to claim 4, wherein the controller is configured to detect the concentration of the soluble neutron poison in the tank according to a chemical method by at least two sampling analyses, and the results of the sampling analyses are uniform.

6. The device for charging a soluble neutron poison according to claim 1, wherein the preparation tank includes a first annular groove, a second annular groove disposed at the periphery of the first annular groove, and the nuclear measuring instrument is disposed on the outer wall of the second annular groove, wherein the first annular groove is used for filling a filler for absorbing neutrons, and the second annular groove is used for containing the prepared soluble neutron poison solution.

7. The device for feeding soluble neutron poison according to any one of claims 1 to 3, 5 and 6, characterized in that the metering tank body is a flat tank.

8. The feeding device for the soluble neutron poison according to any one of claims 1 to 3, 5 and 6, wherein the preparation tank comprises a preparation tank body and a first bubbling stirring pipe arranged in the preparation tank body, and the first bubbling stirring pipe is used for bubbling and stirring the soluble neutron poison solution in the preparation tank body;

and a second bubbling stirring pipe is arranged in the tank body of the metering tank and is used for bubbling and stirring the soluble neutron poison solution in the tank body of the metering tank.

9. The device for charging a soluble neutron poison according to any one of claims 1 to 3, 5, 6, characterized in that it further comprises:

the first storage tank is used for storing water, and an outlet of the first storage tank is connected with the preparation tank;

the second storage tank is used for storing acid, and an outlet of the first storage tank is connected with the preparation tank;

and the third storage tank is used for storing soluble neutron poison, and the outlet of the first storage tank is connected with the preparation tank.

10. The apparatus for charging a soluble neutron poison according to claim 9, further comprising:

the first air lifter is arranged on a connecting pipeline between the preparation tank and the tank body of the metering tank, and the first air lifter is used for lifting the soluble neutron poison solution into the tank body of the metering tank;

and the second air lifter is arranged on a connecting pipeline between the discharge port of the metering tank body and the reactor, and is used for lifting the soluble neutron poison solution into the reactor.

Technical Field

The invention belongs to the technical field of nuclear fuel post-treatment, and particularly relates to a feeding device for soluble neutron poison.

Background

In the process of treating the spent fuel assembly of the nuclear power station by the PUREX water method, firstly, the spent fuel is cut into short sections with certain length, and nitric acid and UO2 pellets in the short sections of the fuel are subjected to dissolution reaction in a reactor. Since fissile nuclides such as U235 and Pu239 exist during dissolution, critical safety issues must be considered. At present, the critical safety control is carried out by adopting good geometry and solid neutron poison in China, and the treatment capacity is limited by the size of equipment.

With the development of the technology in the field of post-treatment, the initial enrichment degree and the fuel consumption of U235 in the spent fuel assembly are higher and higher, the requirement on the treatment capacity of a reactor is higher and higher, and the critical safety control requirement cannot be met by adopting a method of geometric dimension or solid neutron poison. The soluble neutron poison can greatly reduce and even remove the limit of critical safety on the size of equipment, and the processing capacity is improved. Therefore, more and more foreign aftertreatment plants are using soluble neutron poisons to control critical safety, such as the THORP plant in the United kingdom and the Baville plant in the United states. At present, the foreign soluble neutron poison charging method aiming at the reactor is simpler, and the prepared soluble neutron poison solution is directly added into the reactor. The soluble neutron poison has a plurality of using points, so that the discharging direction of the soluble neutron poison is not unique, and the risk of material stringing exists.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a feeding device of soluble neutron poison aiming at the defects in the prior art, after the soluble neutron poison enters a metering tank, the concentration of the soluble neutron poison in the feed liquid added into a reactor can be determined, and the critical safety of the reactor is ensured.

The technical scheme adopted for solving the technical problem of the invention is to provide a feeding device for soluble neutron poison, which comprises:

the preparation tank is used for preparing a soluble neutron poison solution;

a metering tank, comprising: the system comprises a metering tank body and a nuclear measuring instrument connected with the metering tank body and used for detecting the concentration of soluble neutron poison in the metering tank body, wherein the metering tank body is connected with a preparation tank, the nuclear measuring instrument is used for measuring and calculating the concentration of the soluble neutron poison in the metering tank body by a nuclear physics method, and a discharge port of the metering tank body for feeding materials to a reactor is arranged on the metering tank body;

and the controller is used for receiving the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument, calculating the concentration of the soluble neutron poison in the measuring tank body according to the concentration of the soluble neutron poison in the measuring tank body detected by a chemical method and the concentration of the soluble neutron poison in the measuring tank body measured and calculated by the nuclear measuring instrument, and controlling the opening and closing of a first valve on a connecting pipeline between the discharge port of the measuring tank body and the reactor.

Preferably, the controller is further configured to control opening and closing of a second valve on a connection line between the preparation tank and the tank body of the metering tank according to the concentration of the soluble neutron poison in the preparation tank detected by a chemical method, and the controller controls the second valve to open if the concentration of the soluble neutron poison in the preparation tank reaches a preset concentration.

Preferably, the controller is configured to detect the concentration of the soluble neutron poison in the dispensing tank by at least two sampling analyses according to the chemical method, and the results of the sampling analyses are uniform.

Preferably, the controller controls the first valve to open if the concentration of the soluble neutron poison in the tank body of the metering tank detected by a chemical method and the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument are preset concentrations.

Preferably, the controller detects the concentration of the soluble neutron poison in the tank body of the metering tank by a chemical method according to at least two sampling analysis, and the sampling analysis results reach uniformity.

Preferably, the preparation tank comprises a first annular groove and a second annular groove arranged on the periphery of the first annular groove, and the nuclear measuring instrument is arranged on the outer wall of the second annular groove, wherein the first annular groove is used for filling a filler for absorbing neutrons, and the second annular groove is used for containing the prepared soluble neutron poison solution.

Preferably, the metering tank body is a flat tank.

Preferably, the preparation tank comprises a preparation tank body and a first bubbling stirring pipe arranged in the preparation tank body, and the first bubbling stirring pipe is used for bubbling and stirring the soluble neutron poison solution in the preparation tank body;

and a second bubbling stirring pipe is arranged in the tank body of the metering tank and is used for bubbling and stirring the soluble neutron poison solution in the tank body of the metering tank.

Preferably, the feeding device for the soluble neutron poison further comprises:

the first storage tank is used for storing water, and an outlet of the first storage tank is connected with the preparation tank;

the second storage tank is used for storing acid, and an outlet of the first storage tank is connected with the preparation tank;

and the third storage tank is used for storing soluble neutron poison, and the outlet of the first storage tank is connected with the preparation tank.

Preferably, the feeding device for the soluble neutron poison further comprises:

the first air lifter is arranged on a connecting pipeline between the preparation tank and the tank body of the metering tank, and the first air lifter is used for lifting the soluble neutron poison solution into the tank body of the metering tank;

and the second air lifter is arranged on a connecting pipeline between the discharge port of the metering tank body and the reactor, and is used for lifting the soluble neutron poison solution into the reactor.

Compared with the prior art, the invention has the beneficial effects that:

(1) the feeding device for the soluble neutron poison is adopted to control the nuclear critical safety, the processing capacity of the reactor is improved, the limitation of the nuclear critical safety on the geometric dimension of the equipment is reduced and even eliminated, the diameter of the reactor can be increased, the height of the reactor can be reduced, the heights of the equipment chamber and the hot chamber can be reduced, and the investment and the operation cost of a factory building can be reduced.

(2) After the soluble neutron poison enters the metering tank, the concentration of the soluble neutron poison in the feed liquid added into the reactor can be determined, and the critical safety of the reactor is ensured.

(3) The discharging of the metering tank has unique directivity to the reactor, and the concentration of soluble neutron poison is reduced due to the problems of material mixing and the like on process arrangement, so that the critical accident of the reactor is caused.

Drawings

FIG. 1 is a schematic view of the structure of a soluble neutron poison loading apparatus in example 2 of the present invention;

FIG. 2 is a front view of a formulating tank in example 2 of the present invention;

FIG. 3 is a top view of a dispensing tank in example 2 of the present invention;

FIG. 4 is a front view of a measuring tank in example 2 of the present invention.

In the figure: 1-preparing a tank; 2-a metering tank; 3-measuring the trough body; 4-nuclear gauge; 5-a first valve; 6-a second valve; 7-a first annular groove; 8-a second annular groove; 9-a filler; 10-a first bubbling stirring tube; 11-a second bubbling stirring pipe; 12-a first call bank pipe; 13-a second calandria; 14-a first receptacle; 15-a second receptacle; 16-a third sump; 17-a first airlift; 18-a second airlift; 19-reactor.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

Example 1

The present embodiment provides a feeding device for a soluble neutron poison, including:

the preparation tank is used for preparing a soluble neutron poison solution;

a metering tank, comprising: the system comprises a metering tank body and a nuclear measuring instrument connected with the metering tank body and used for detecting the concentration of soluble neutron poison in the metering tank body, wherein the metering tank body is connected with a preparation tank, the nuclear measuring instrument is used for measuring and calculating the concentration of the soluble neutron poison in the metering tank body by a nuclear physics method, and a discharge port of the metering tank body for feeding materials to a reactor is arranged on the metering tank body;

and the controller is used for receiving the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument, calculating the concentration of the soluble neutron poison in the measuring tank body according to the concentration of the soluble neutron poison in the measuring tank body detected by a chemical method and the concentration of the soluble neutron poison in the measuring tank body measured and calculated by the nuclear measuring instrument, and controlling the opening and closing of a first valve on a connecting pipeline between the discharge port of the measuring tank body and the reactor.

Compared with the prior art, the invention has the beneficial effects that:

(1) the feeding device for the soluble neutron poison is adopted to control the nuclear critical safety, the processing capacity of the reactor is improved, the limitation of the nuclear critical safety on the geometric dimension of the equipment is reduced and even eliminated, the diameter of the reactor can be increased, the height of the reactor can be reduced, the heights of the equipment chamber and the hot chamber can be reduced, and the investment and the operation cost of a factory building can be reduced.

(2) After the soluble neutron poison enters the metering tank, the concentration of the soluble neutron poison in the feed liquid added into the reactor can be determined, and the critical safety of the reactor is ensured.

(3) The discharging of the metering tank has unique directivity to the reactor, and the concentration of soluble neutron poison is reduced due to the problems of material mixing and the like on process arrangement, so that the critical accident of the reactor is caused.

Example 2

As shown in fig. 1, the present embodiment provides a soluble neutron poison charging device, including:

the preparation tank 1 is used for preparing a soluble neutron poison solution;

a metering tank 2 comprising: the device comprises a metering tank body 3 and a nuclear measuring instrument 4 connected with the metering tank body 3 and used for detecting the concentration of soluble neutron poison in the metering tank body 3, wherein the metering tank body 3 is connected with a preparation tank 1, the nuclear measuring instrument 4 is used for measuring and calculating the concentration of the soluble neutron poison in the metering tank body 3 by a nuclear physics method, and a discharge port of the metering tank body 3 for feeding materials to a reactor 19 is arranged on the metering tank body 3;

and the controller is used for receiving the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument 4, calculating the concentration of the soluble neutron poison in the metering tank body 3 according to the concentration of the soluble neutron poison in the metering tank body 3 detected by a chemical method and the concentration of the soluble neutron poison in the metering tank body 3 measured and calculated by the nuclear measuring instrument 4, and controlling the opening and closing of the first valve 5 on a connecting pipeline between the discharge port of the metering tank body 3 and the reactor 19. The discharge port of the metering tank body 3 has only directivity to the reactor 19, that is, the metering tank body 3 has only one discharge port pointing to the reactor 19.

Preferably, the soluble neutron poison is gadolinium nitrate and/or chromium nitrate. The method for charging by using the charging device in the embodiment comprises the following steps: firstly, determining the concentration of the soluble neutron poison, adding the soluble neutron poison and the solvent into a preparation tank 1, uniformly mixing the soluble neutron poison and the solvent in the preparation tank 1, then feeding the mixture into a metering tank 2, and controlling the opening and closing of a first valve 5 through a controller to control the soluble neutron poison solution to enter a reactor 19.

The water used in the preparation tank 1 is widely available and may contain radioactivity, according to the principle that the water in the project sub-item is to be fully utilized.

Preferably, the controller is further configured to control the opening and closing of the second valve 6 on the connection line between the preparation tank 1 and the metering tank body 3 according to the concentration of the soluble neutron poison in the preparation tank 1 detected by the chemical method, and the controller controls the opening of the second valve 6 if the concentration of the soluble neutron poison in the preparation tank 1 reaches a preset concentration.

Preferably, the controller detects the concentration of the soluble neutron poison in the preparation tank 1 by a chemical method according to at least two sampling analysis, and the sampling analysis results reach uniformity.

Preferably, the controller controls the first valve 5 to open if the concentration of the soluble neutron poison in the metering tank body 3 detected by the chemical method and the concentration of the soluble neutron poison measured and calculated by the nuclear measuring instrument 4 are both preset concentrations.

Preferably, the controller detects the concentration of the soluble neutron poison in the metering tank body 3 by a chemical method according to at least two sampling analysis, and the sampling analysis results reach uniformity.

As shown in fig. 2 to 4, preferably, the preparation tank 1 includes a first annular groove 7 and a second annular groove 8 disposed at the periphery of the first annular groove 7, and the nuclear measuring instrument 4 is disposed on the outer wall of the second annular groove 8, wherein the first annular groove 7 is used for filling a filler 9 for absorbing neutrons, and the second annular groove 8 is used for containing a soluble neutron poison solution to be prepared. Specifically, the neutron absorbing filler 9 in this embodiment is boron-containing cement, which is used to ensure nuclear critical safety.

Preferably, the metering tank body 3 is a flat tank. The metering tank body 3 has simple structure and high liquid level therein, is convenient for monitoring the liquid level and can control the critical safety by geometric dimension.

Preferably, the preparation tank 1 comprises a preparation tank body and a first bubbling stirring pipe 10 arranged in the preparation tank body, and the first bubbling stirring pipe 10 is used for bubbling and stirring the soluble neutron poison solution in the preparation tank body;

and a second bubbling stirring pipe 11 is arranged in the metering tank body 3, and the second bubbling stirring pipe 11 is used for bubbling and stirring the soluble neutron poison solution in the metering tank body 3. The first bubbling stirring pipe 10 is used for stirring, so that the distribution of the feed liquid in the tank body of the preparation tank has uniformity. The tank body of the preparation tank is also provided with a first exhaling pipe 12 for exhausting. And a second bubbling stirring pipe 11 is arranged in the metering tank body 3, and the second bubbling stirring pipe 11 is used for bubbling and stirring the soluble neutron poison solution in the metering tank body 3. A second exhaust pipe 13 for exhausting is arranged in the measuring tank body 3.

Preferably, the feeding device for the soluble neutron poison further comprises:

a first storage tank 14 for storing water, an outlet of the first storage tank 14 being connected to the preparation tank 1;

a second storage tank 15 for storing acid, an outlet of the first storage tank 14 is connected with the preparation tank 1;

and a third storage tank 16 for storing soluble neutron poison, wherein the outlet of the first storage tank 14 is connected with the preparation tank 1.

Preferably, the feeding device for the soluble neutron poison further comprises:

the first air lifter 17 is arranged on a connecting pipeline between the preparation tank 1 and the metering tank body 3, and the first air lifter 17 is used for lifting the soluble neutron poison solution into the metering tank body 3;

and the second air lifter 18 is arranged on a connecting pipeline between the discharge hole of the metering tank body 3 and the reactor 19, and the second air lifter 18 is used for lifting the soluble neutron poison solution into the reactor 19.

The preparation tank 1 is connected with a plurality of nozzles and process equipment, and comprises a first storage tank 14, a second storage tank 15 and a third storage tank 16. If the pressure of the medium in the process pipeline is too high or too low, the feed liquid can be mixed with air and water in the pipeline, so that the risk of material mixing is caused, and the concentration of the soluble neutron poison in the preparation tank 1 is reduced. Set up first air lifter 17 on the connecting line between preparation groove 1 and metering tank cell body 3, promote the feed liquid and get into metering tank 2, can prevent to cluster the material. The metering tank 2 is separately arranged in one room, the concentration of the soluble neutron poison is measured by a nuclear measuring instrument 4, and the controller meters and controls the discharge amount. And (3) carrying out sampling analysis for multiple times in the metering tank body 3 and combining with the nuclear measuring instrument 4 to determine the concentration and distribution uniformity and effectiveness of the soluble neutron poison, and ensuring that the concentration of the soluble neutron poison reaches a critical safety requirement value and then enters the reactor 19 through the second air lifter 18.

The concentration of the soluble neutron poison is important for the nuclear critical safety control of the reactor 19, in this embodiment, whether the concentration of the soluble neutron poison meets the nuclear critical safety control requirement is confirmed by two independent methods, the first method is to detect the concentration by a chemical method: the uniformity of concentration and distribution of soluble neutron poison was first determined. A sampling port is arranged in the preparation tank 1, after bubbling and stirring are carried out uniformly, the concentration of soluble neutron poison in the sampling feed liquid is measured by using a high-resolution mass spectrometer, a certain margin (for example, more than 3g/L) is ensured, and the soluble neutron poison can enter the metering tank 2 after sampling and analyzing for many times until the requirement is met.

A sampling port is also arranged in the metering tank 2, and sampling analysis is carried out again for a plurality of times before the reactor 19 is added to determine the concentration of the soluble neutron poison. If the concentration of the feed liquid sampled for multiple times is the same and is within a target range (for example, 0.3-3 g/L), the concentration and uniformity of the soluble neutron poison can be ensured, so that the feed liquid added into the reactor 19 can meet the nuclear critical safety requirement.

The second is the detection concentration of the nuclear measurement method: since the preparation tank 1 is an annular tank, the accuracy of the nuclear measuring device is affected by the boron-containing cement, and therefore the nuclear measuring instrument 4 is arranged on the outer wall of the second annular tank 8. A neutron source is arranged in the nuclear measuring instrument 4, the neutron number is measured according to the flux change condition of neutrons behind the measuring groove 2, and the neutron number is converted into the concentration of soluble neutron poison by an algorithm. The concentration and uniformity of the soluble neutron poison entering the reactor 19 are confirmed to meet the nuclear critical safety requirements by the two methods.

When the feed liquid is prepared in the preparation tank 1, a certain allowance is considered for the amount of the soluble neutron poison, and even if the soluble neutron poison is mixed after sampling and analyzing, the concentration of the soluble neutron poison can be further verified in the metering tank 2. When the sampling analysis and the nuclear measurement in the metering tank 2 meet the requirements, the charging process of the preparation tank 1 is stopped, and the feed liquid in the metering tank 2 enters the reactor 19 to participate in the reaction.

Compared with the prior art, the invention has the beneficial effects that:

(1) the feeding device for soluble neutron poison is adopted to control the nuclear critical safety, so that the processing capacity of the reactor 19 is improved, the limitation of the nuclear critical safety on the geometric dimension of the equipment is reduced and even eliminated, the diameter of the reactor 19 can be increased, the height of the reactor can be reduced, the heights of the equipment chamber and the hot chamber can be reduced, and the investment and the operation cost of a factory building can be reduced.

(2) After the soluble neutron poison enters the metering tank 2, the concentration of the soluble neutron poison in the feed liquid added into the reactor 19 can be determined, and the critical safety of the reactor 19 is ensured.

(3) The discharging of the metering tank 2 has unique directivity to the reactor 19, and the problem of material mixing and the like can be avoided in process arrangement to cause the concentration of soluble neutron poison to be reduced, thereby causing the critical accident of the reactor 19.

(4) The solution of the soluble neutron poison in the metering tank 2 is subjected to chemical sampling analysis and is measured by combining a nuclear measuring instrument 4, so that the distribution uniformity and effectiveness of the soluble neutron poison in the feed liquid after being added into the reactor 19 are ensured.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.