Method and system for removing impurities in high-temperature and high-pressure irradiation test loop

Abstract

The invention discloses a method and a system for removing impurities in a high-temperature and high-pressure irradiation test loop. The system comprises a first resin bed, a second resin bed, a third resin bed, a fourth resin bed, valves and pipelines, one or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are connected in series or in parallel through the valves and the pipelines; wherein the first resin bed is loaded with nuclear-grade hydrogen type cation resin, the second resin bed is loaded with nuclear-grade hydrogen-oxygen type anion resin, the third resin bed is loaded with lithium type resin and boron type resin, and the fourth resin bed is loaded with lithium type resin and boron type resin. The four resin beds are connected in series or in parallel, so that the content of different impurities can be reduced to a limited range.

Description

Technical Field

[0001] The present invention relates to the field of nuclear technology, and in particular to a method and system for removing impurities in a high-temperature and high-pressure irradiation test loop. Background Art

[0002] The high temperature and high pressure irradiation test loop simulates the state of the primary loop of a pressurized water reactor during normal operation, creates a high temperature and high pressure nuclear test environment like the primary loop, and is used for irradiation test of fuel elements, materials, etc. During the irradiation test of the high temperature and high pressure irradiation test loop, due to the corrosion of materials, the migration of corrosion products, and the release of impurity elements in the materials, the impurity elements in the loop water quality will gradually accumulate. When the accumulation reaches a certain level, the water quality will deviate, and at this time, the various parameters of the impurity elements in the water quality will exceed the operating limit of the water quality. Therefore, how to remove impurities in the high temperature and high pressure irradiation test loop has become a technical problem that needs to be solved urgently by technicians in this field. Summary of the invention

[0003] An embodiment of the present application provides a method and system for removing impurities in a high-temperature and high-pressure irradiation test loop. The system includes four resin beds that can be connected in series and in parallel. By connecting the four resin beds in different series or parallel modes, the content of different impurities can be reduced to a limit range.

[0004] In a first aspect, the present application provides an impurity removal system in a high-temperature and high-pressure irradiation test loop, comprising: a first resin bed, a second resin bed, a third resin bed, a fourth resin bed, valves and pipelines; one or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are arranged in series or in parallel through the valves and pipelines; wherein the first resin bed is loaded with a nuclear-grade hydrogen-type cation resin, the second resin bed is loaded with a nuclear-grade hydroxide-type anion resin, the third resin bed is loaded with a lithium-type resin and a boron-type resin, and the fourth resin bed is loaded with a lithium-type resin and a boron-type resin.

[0005] In some embodiments, the 7Li abundance of the lithium-type resin in the third resin bed and the fourth resin bed is greater than 99.9%.

[0006] In some embodiments, the mass ratio of the lithium type resin to the boron type resin in the third resin bed and the fourth resin bed is 1.5-2.

[0007] In some embodiments, the boron type resin is obtained by transforming a nuclear grade hydroxide type anion resin by eluting with a boric acid solution.

[0008] In some embodiments, the pipeline includes a main water inlet pipe, a first sub-water inlet pipe, a second sub-water inlet pipe, a third sub-water inlet pipe, a fourth sub-water inlet pipe, a main water outlet pipe, a first sub-water outlet pipe, a second sub-water outlet pipe, a third sub-water outlet pipe, a fourth sub-water outlet pipe, a first auxiliary pipe, a second auxiliary pipe and a third auxiliary pipe; the valve includes a first water inlet valve, a second water inlet valve, a third water inlet valve, a fourth water inlet valve, a fifth water inlet valve, a first water outlet valve, a second water outlet valve, a third water outlet valve, a first auxiliary valve, a second auxiliary valve and a third auxiliary valve;

[0009] One end of the first resin bed is connected to one end of the first sub-water inlet pipe; the other end of the first resin bed is connected to one end of the first sub-water outlet pipe; one end of the second resin bed is connected to one end of the second sub-water inlet pipe; the other end of the second resin bed is connected to one end of the second sub-water outlet pipe; one end of the third resin bed is connected to one end of the third sub-water inlet pipe; the other end of the third resin bed is connected to one end of the third sub-water outlet pipe; one end of the fourth resin bed is connected to one end of the fourth sub-water inlet pipe; the other end of the fourth resin bed is connected to one end of the fourth sub-water outlet pipe;

[0010] The other end of the first sub-water inlet pipe, the other end of the second sub-water inlet pipe, the other end of the third sub-water inlet pipe and the other end of the fourth sub-water inlet pipe are respectively connected to the main water inlet pipe;

[0011] The first water inlet valve is arranged on the first sub-water inlet pipe; the second water inlet valve is arranged on the second sub-water inlet pipe; the third water inlet valve is arranged on the third sub-water inlet pipe; the fourth water inlet valve is arranged on the fourth sub-water inlet pipe;

[0012] A fifth water inlet valve is provided on the main water inlet pipe after the position communicating with the fourth sub-water inlet pipe;

[0013] The other end of the first sub-water outlet pipe, the other end of the second sub-water outlet pipe, the other end of the third sub-water outlet pipe and the other end of the fourth sub-water outlet pipe are respectively connected to the main water outlet pipe;

[0014] The main water outlet pipe is provided with a first water outlet valve between a position connected with the first sub-water outlet pipe and a position connected with the second sub-water outlet pipe; the main water outlet pipe is provided with a second water outlet valve between a position connected with the second sub-water outlet pipe and a position connected with the third sub-water outlet pipe; the main water outlet pipe is provided with a third water outlet valve between a position connected with the third sub-water outlet pipe and a position connected with the fourth sub-water outlet pipe;

[0015] The first auxiliary valve is arranged on the first auxiliary pipe; the second auxiliary valve is arranged on the second auxiliary pipe; the third auxiliary valve is arranged on the third auxiliary pipe;

[0016] One end of the first auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the first sub-water inlet pipe and the position where the main water inlet pipe is connected to the second sub-water inlet pipe; the other end of the first auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the first sub-water outlet pipe and the first water outlet valve;

[0017] One end of the second auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the second sub-water inlet pipe and the position where the main water inlet pipe is connected to the third sub-water inlet pipe; the other end of the second auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the second sub-water outlet pipe and the second water outlet valve;

[0018] One end of the third auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the third sub-water inlet pipe and the position where the main water inlet pipe is connected to the fourth sub-water inlet pipe; the other end of the third auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the third sub-water outlet pipe and the third water outlet valve.

[0019] In a second aspect, the present application provides a method for removing impurities in a high temperature and high pressure irradiation test loop, which is applied to a system, comprising:

[0020] When it is detected that the boron ions in the boron-lithium water in the test loop exceed the standard, the boron-lithium water is controlled to enter the second resin bed and the third resin bed connected in series, or to enter the second resin bed and the fourth resin bed connected in series; when the anions other than boron ions in the boron-lithium water in the test loop exceed the standard, the flow rate of the boron-lithium water is controlled to increase, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel;

[0021] When Li in boron-lithium water in the test circuit is detected + When the content exceeds the standard, the boron-lithium water is controlled to enter the first resin bed and the third resin bed connected in series, or to enter the first resin bed and the fourth resin bed connected in series;

[0022] When the boron-lithium water in the test circuit is detected to remove Li + When the cations other than the above are exceeded, the flow rate of the boron-lithium water is controlled to be increased, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel.

[0023] In some embodiments, when no excessive ions are detected in the test loop, the boron lithium water is controlled to enter the third resin bed or the fourth resin bed at a flow rate not less than a preset flow rate; the preset flow rate is the total volume of the test loop divided by 24 hours.

[0024] In some embodiments, the second water inlet valve, the second auxiliary valve, the third water inlet valve and the third water outlet valve are controlled to be opened, and the first water inlet valve, the first auxiliary valve, the first water outlet valve, the second water outlet valve, the fourth water inlet valve, the third auxiliary valve and the fifth water inlet valve are controlled to be closed;

[0025] The step of controlling boron-lithium water to enter the second resin bed and the fourth resin bed connected in series includes: controlling the first water inlet valve, the first water outlet valve, the second auxiliary valve, the third water inlet valve, and the third water outlet valve to open, and controlling the second water inlet valve, the fourth water inlet valve, the second water outlet valve, the third auxiliary valve, the fifth water outlet valve, and the first auxiliary valve to close.

[0026] In some embodiments, the step of controlling the boron lithium water to enter the first resin bed and the third resin bed connected in series comprises: controlling the first water inlet valve, the first water outlet valve, the second auxiliary valve, the third water inlet valve, the third auxiliary valve and the fifth water outlet valve to be opened, and controlling the second water inlet valve, the fourth water inlet valve, the second water outlet valve, the third water outlet valve and the first auxiliary valve to be closed;

[0027] The steps of controlling the boron-lithium water to enter the first resin bed and the fourth resin bed in series include:

[0028] The first water inlet valve, the first water outlet valve, the second water outlet valve, the third auxiliary valve and the fourth water inlet valve are controlled to open, and the second water inlet valve, the third water inlet valve, the fifth water inlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve are controlled to close.

[0029] In some embodiments, the step of controlling the boron lithium water to enter the third resin bed and the fourth resin bed connected in series comprises: controlling the third water inlet valve, the fourth water inlet valve and the third auxiliary valve to be opened, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to be closed;

[0030] The step of controlling boron lithium water to enter the third resin bed and the fourth resin bed connected in parallel includes: controlling the third water inlet valve, the fourth water inlet valve and the third water outlet valve to open, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the first auxiliary valve, the second auxiliary valve and the third auxiliary valve to close.

[0031] The present application provides a method and system for removing impurities in a high-temperature and high-pressure irradiation test loop, the system comprising a first resin bed, a second resin bed, a third resin bed, a fourth resin bed, a valve and a pipeline; one or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are arranged in series or in parallel through the valve and the pipeline; wherein the first resin bed is loaded with a nuclear-grade hydrogen-type cation resin, the second resin bed is loaded with a nuclear-grade hydroxyl-type anion resin, the third resin bed is loaded with a lithium-type resin and a boron-type resin, and the fourth resin bed is loaded with a lithium-type resin and a boron-type resin. By connecting the four resin beds in different series or parallel ways, it is possible to reduce the content of different impurities to a limited range and minimize the harm to the materials and fuel cladding. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of an impurity removal system in a high-temperature and high-pressure irradiation test loop provided according to some embodiments is exemplified. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the technical solution of the present application is described in detail below through specific implementation methods.

[0034] Key chemical parameters of water quality in the high temperature and high pressure irradiation test loop, such as fluoride, chlorine, sulfate (F - , Cl - 、SO4 2- ) will accelerate uniform corrosion and stress cracking corrosion (SCC). Excessive amounts of calcium, magnesium and silicon (Ca, Mg, Si) will increase the risk of fouling on the surface of fuel elements, thereby affecting the performance of the fuel and even causing power deviation. + ) causes metal corrosion, which reduces the strength and hardness of the metal and reduces the safety performance of the pipeline. In addition, some corrosion products released from the surface of the primary circuit system will be deposited on the surface of the fuel element, and some nuclides in the deposits will be activated (such as 60 Co. 137 Cs), and then released, migrated and deposited outside the core, resulting in increased radiation levels. Therefore, the excessive B and Li + 、F - , Cl - 、SO4 2- , Ca, Mg, Si, Na + , 60 Co. 137 Removing impurity elements such as Cs is one of the key technologies in testing fuel elements.

[0035] In order to solve the above-mentioned technical problems, an embodiment of the present application provides an impurity removal system in a high-temperature and high-pressure irradiation test loop, wherein the system includes four resin beds that can be connected in series and in parallel. By connecting the four resin beds in different series or parallel modes, the content of different impurities can be reduced to a limit range.

[0036] Figure 1 A schematic structural diagram of an impurity removal system in a high-temperature and high-pressure irradiation test loop provided according to some embodiments is exemplified.

[0037] exist Figure 1 The system comprises: a first resin bed 1, a second resin bed 2, a third resin bed 3, a fourth resin bed 4, a valve 5 and a pipeline 6; one or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are arranged in series or in parallel through the valve and the pipeline; wherein the first resin bed is loaded with a nuclear-grade hydrogen-type cation resin, the second resin bed is loaded with a nuclear-grade hydroxide-type anion resin, the third resin bed is loaded with a lithium-type resin and a boron-type resin, and the fourth resin bed is loaded with a lithium-type resin and a boron-type resin.

[0038] In some embodiments, the 7Li abundance of the lithium type resin in the third resin bed and the fourth resin bed is greater than 99.9%. In some embodiments, the mass ratio of the lithium type resin to the boron type resin in the third resin bed and the fourth resin bed is 1.5-2. In some embodiments, the boron type resin is obtained by eluting a nuclear grade hydroxide type anion resin with a boric acid solution. In the embodiment of the present application, at least two mixed beds are loaded, namely the third resin bed and the fourth resin bed, one of which can be used as a backup device to avoid only one mixed bed. If there is a problem with the mixed bed, the system cannot operate.

[0039] The system in the embodiment of the present application is composed of four resin beds. The first resin bed is loaded with nuclear grade hydrogen type cation resin, the second resin bed is loaded with nuclear grade hydroxide type anion resin, and the third and fourth resin beds are loaded with lithium ( 7 The mixed bed is composed of boron type and lithium type resin (Li abundance>99.9%). The mass ratio of boron type to lithium type resin in the mixed bed is controlled between 1.5 and 2.0. The resin beds in the system can be operated in series or in parallel.

[0040] Nuclear grade hydrogen type cationic resin: Strong acid type cationic resin is required, and the resin brand model is Zhejiang Zhengguang Resin ZGCNR50.

[0041] Nuclear grade hydroxide anion resin: Strong base anion resin is required, and the resin brand model is Zhejiang Zhengguang Resin ZGCNR170.

[0042] lithium( 7Li abundance>99.9%) type resin: Strong acid type cationic resin is required, the resin brand model is Zhejiang Zhengguang resin 7 Li ZGCNR50, which must meet 7 Li abundance>99.9% is due to 6 Li is irradiated with neutrons to obtain tritium ( 3 H), tritium is a beta radiator with a long half-life and is difficult to separate, so it is not suitable for pH adjustment.

[0043] Boron type resin: obtained by transforming nuclear grade hydroxide type anion resin by eluting with boric acid solution.

[0044] In some embodiments, the pipeline 6 includes a main water inlet pipe 601, a first sub-water inlet pipe 602, a second sub-water inlet pipe 603, a third sub-water inlet pipe 604, a fourth sub-water inlet pipe 605, a main water outlet pipe 606, a first sub-water outlet pipe 607, a second sub-water outlet pipe 608, a third sub-water outlet pipe 609, a fourth sub-water outlet pipe 610, a first auxiliary pipe 611, a second auxiliary pipe 612 and a third auxiliary pipe 613; the valve 5 includes a first water inlet valve 501, a second water inlet valve 502, a third water inlet valve 503, a fourth water inlet valve 504, a fifth water inlet valve 505, a first water outlet valve 506, a second water outlet valve 507, a third water outlet valve 508, a first auxiliary valve 509, a second auxiliary valve 510 and a third auxiliary valve 511.

[0045] One end of the first resin bed is connected to one end of the first sub-water inlet pipe; the other end of the first resin bed is connected to one end of the first sub-water outlet pipe; one end of the second resin bed is connected to one end of the second sub-water inlet pipe; the other end of the second resin bed is connected to one end of the second sub-water outlet pipe; one end of the third resin bed is connected to one end of the third sub-water inlet pipe; the other end of the third resin bed is connected to one end of the third sub-water outlet pipe; one end of the fourth resin bed is connected to one end of the fourth sub-water inlet pipe; the other end of the fourth resin bed is connected to one end of the fourth sub-water outlet pipe;

[0046] The other end of the first sub-water inlet pipe, the other end of the second sub-water inlet pipe, the other end of the third sub-water inlet pipe and the other end of the fourth sub-water inlet pipe are respectively connected to the main water inlet pipe;

[0047] The first water inlet valve is arranged on the first sub-water inlet pipe; the second water inlet valve is arranged on the second sub-water inlet pipe; the third water inlet valve is arranged on the third sub-water inlet pipe; the fourth water inlet valve is arranged on the fourth sub-water inlet pipe;

[0048] A fifth water inlet valve is provided on the main water inlet pipe after the position communicating with the fourth sub-water inlet pipe;

[0049] The other end of the first sub-water outlet pipe, the other end of the second sub-water outlet pipe, the other end of the third sub-water outlet pipe and the other end of the fourth sub-water outlet pipe are respectively connected to the main water outlet pipe;

[0050] The main water outlet pipe is provided with a first water outlet valve between a position connected with the first sub-water outlet pipe and a position connected with the second sub-water outlet pipe; the main water outlet pipe is provided with a second water outlet valve between a position connected with the second sub-water outlet pipe and a position connected with the third sub-water outlet pipe; the main water outlet pipe is provided with a third water outlet valve between a position connected with the third sub-water outlet pipe and a position connected with the fourth sub-water outlet pipe;

[0051] The first auxiliary valve is arranged on the first auxiliary pipe; the second auxiliary valve is arranged on the second auxiliary pipe; the third auxiliary valve is arranged on the third auxiliary pipe;

[0052] One end of the first auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the first sub-water inlet pipe and the position where the main water inlet pipe is connected to the second sub-water inlet pipe; the other end of the first auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the first sub-water outlet pipe and the first water outlet valve;

[0053] One end of the second auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the second sub-water inlet pipe and the position where the main water inlet pipe is connected to the third sub-water inlet pipe; the other end of the second auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the second sub-water outlet pipe and the second water outlet valve;

[0054] One end of the third auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the third sub-water inlet pipe and the position where the main water inlet pipe is connected to the fourth sub-water inlet pipe; the other end of the third auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the third sub-water outlet pipe and the third water outlet valve.

[0055] The present application also provides a method for removing impurities in a high-temperature and high-pressure irradiation test loop, which is applied to a system and includes:

[0056] When it is detected that the boron ions in the boron-lithium water in the test loop exceed the standard, the boron-lithium water is controlled to enter the second resin bed and the third resin bed connected in series, or to enter the second resin bed and the fourth resin bed connected in series;

[0057] When the anions other than boron ions in the boron-lithium water in the test loop exceed the standard, the flow rate of the boron-lithium water is controlled to increase, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel;

[0058] When Li in boron-lithium water in the test circuit is detected + When the content exceeds the standard, the boron-lithium water is controlled to enter the first resin bed and the third resin bed connected in series, or to enter the first resin bed and the fourth resin bed connected in series;

[0059] When the boron-lithium water in the test circuit is detected to remove Li + When the cations other than the above are exceeded, the flow rate of the boron-lithium water is controlled to be increased, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel.

[0060] In the embodiment of the present application, when it is detected that there is an excess of ions in the test loop, the boron lithium water is controlled to enter the resin bed in series or in parallel. In some embodiments, after the boron lithium water is controlled to enter the resin bed in series or in parallel and runs for a period of time, the anion content and the cation content in the boron lithium water in the test loop are re-detected to see whether they exceed the standard. If there is an excess, the boron lithium water is controlled to enter the resin bed in series or in parallel again.

[0061] In some embodiments, when no excess ions are detected in the test loop, the boron lithium water is controlled to enter the third resin bed or the fourth resin bed at a preset flow rate not less than that; the preset flow rate is the total volume of the test loop divided by 24 hours. In this embodiment, the flow rate of the boron lithium water is determined by the amount of the third resin bed or the fourth resin bed used to purify the loop volume at least once a day. In some embodiments, the loop volume can be purified three or four times a day.

[0062] During normal operation of the loop, the lithium borate water passes through the third resin bed or the fourth resin bed. Exemplarily, the total volume of the test loop is 1000 L, and the preset flow rate is 41.67 L / h.

[0063] In some embodiments, the step of controlling the boron-lithium water to enter the second resin bed and the third resin bed in series includes: controlling the second water inlet valve, the second auxiliary valve, the third water inlet valve and the third water outlet valve to be opened, and controlling the first water inlet valve, the first auxiliary valve, the first water outlet valve, the second water outlet valve, the fourth water inlet valve, the third auxiliary valve and the fifth water inlet valve to be closed. In other embodiments, the step of controlling the boron-lithium water to enter the second resin bed and the third resin bed in series includes: controlling the second water inlet valve, the second auxiliary valve, the third water inlet valve, the third auxiliary valve and the fifth water inlet valve to be opened, and controlling the first water inlet valve, the first auxiliary valve, the first water outlet valve, the second water outlet valve, the fourth water inlet valve and the third water outlet valve to be closed.

[0064] In some embodiments, the step of controlling the boron lithium water to enter the second resin bed and the fourth resin bed connected in series includes: controlling the second water inlet valve, the second water outlet valve, the third auxiliary valve and the fourth water inlet valve to open, and controlling the first water inlet valve, the third water inlet valve, the fifth water inlet valve, the first water outlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to close.

[0065] In some embodiments, the step of controlling the boron lithium water to enter the first resin bed and the third resin bed in series includes: controlling the first water inlet valve, the first water outlet valve, the second auxiliary valve, the third water inlet valve, and the third water outlet valve to be opened, and controlling the second water inlet valve, the fourth water inlet valve, the second water outlet valve, the third auxiliary valve, the fifth water outlet valve, and the first auxiliary valve to be closed. In other embodiments, the step of controlling the boron lithium water to enter the first resin bed and the third resin bed in series includes: controlling the second water inlet valve, the second water outlet valve, the third auxiliary valve, and the fourth water inlet valve to be opened, and controlling the first water inlet valve, the third water inlet valve, the fifth water inlet valve, the first water outlet valve, the third water outlet valve, the first auxiliary valve, and the second auxiliary valve to be closed.

[0066] The step of controlling boron lithium water to enter the first resin bed and the fourth resin bed connected in series includes: controlling the first water inlet valve, the first water outlet valve, the second water outlet valve, the third auxiliary valve and the fourth water inlet valve to open, and controlling the second water inlet valve, the third water inlet valve, the fifth water inlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to close.

[0067] In some embodiments, the step of controlling boron lithium water to enter the third resin bed and the fourth resin bed connected in series includes: controlling the third water inlet valve, the fourth water inlet valve and the third auxiliary valve to open, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to close.

[0068] In some embodiments, the step of controlling boron lithium water to enter the third resin bed and the fourth resin bed connected in parallel includes: controlling the third water inlet valve, the fourth water inlet valve and the third water outlet valve to open, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the first auxiliary valve, the second auxiliary valve and the third auxiliary valve to close.

[0069] By using the system in the embodiment of the present application and the method applied to the system, the anion content can be reduced to 5ug / L; the concentration of calcium in the cations can be reduced to 10ug / L, the concentration of magnesium can be reduced to 5ug / L, the concentration of silicon can be reduced to 20ug / L, and the concentration of sodium can be reduced to less than 4ug / L; the method in the embodiment of the present application has been verified through loop operation, and the removal of impurity elements is reliable, which is suitable for the control of impurity elements in boron-lithium alkaline water quality for fuel element irradiation testing.

[0070] In summary, the present invention provides a method and system for removing impurities in a high-temperature and high-pressure irradiation test loop, the system comprising a first resin bed, a second resin bed, a third resin bed, a fourth resin bed, a valve and a pipeline; one or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are arranged in series or in parallel through the valve and the pipeline; wherein the first resin bed is loaded with a nuclear-grade hydrogen-type cation resin, the second resin bed is loaded with a nuclear-grade hydroxide-type anion resin, the third resin bed is loaded with a lithium-type resin and a boron-type resin, and the fourth resin bed is loaded with a lithium-type resin and a boron-type resin. By connecting the four resin beds in different series or parallel ways, it is possible to reduce the content of different impurities to a limited range.

[0071] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed. The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application. The above are only preferred implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An impurity removal system in a high temperature and high pressure irradiation test circuit, characterized in that: include: a first resin bed, a second resin bed, a third resin bed, a fourth resin bed, valves and pipelines; One or more of the first resin bed, the second resin bed, the third resin bed and the fourth resin bed are arranged in series or in parallel through the valves and pipelines; wherein the first resin bed is loaded with nuclear grade hydrogen type cation resin, the second resin bed is loaded with nuclear grade hydroxide type anion resin, the third resin bed is loaded with lithium type resin and boron type resin, and the fourth resin bed is loaded with lithium type resin and boron type resin.

2. The system according to claim 1, characterized in that The 7Li abundance of the lithium-type resin in the third resin bed and the fourth resin bed is greater than 99.9%.

3. The system according to claim 1, characterized in that The mass ratio of the lithium type resin to the boron type resin in the third resin bed and the fourth resin bed is 1.5-2.

4. The system according to claim 1, characterized in that The boron type resin is obtained by transforming a nuclear grade hydroxide type anion resin by eluting with a boric acid solution.

5. The system according to claim 1, characterized in that The pipeline includes a main water inlet pipe, a first sub-water inlet pipe, a second sub-water inlet pipe, a third sub-water inlet pipe, a fourth sub-water inlet pipe, a main water outlet pipe, a first sub-water outlet pipe, a second sub-water outlet pipe, a third sub-water outlet pipe, a fourth sub-water outlet pipe, a first auxiliary pipe, a second auxiliary pipe and a third auxiliary pipe; the valve includes a first water inlet valve, a second water inlet valve, a third water inlet valve, a fourth water inlet valve, a fifth water inlet valve, a first water outlet valve, a second water outlet valve, a third water outlet valve, a first auxiliary valve, a second auxiliary valve and a third auxiliary valve; One end of the first resin bed is connected to one end of the first sub-water inlet pipe; the other end of the first resin bed is connected to one end of the first sub-water outlet pipe; one end of the second resin bed is connected to one end of the second sub-water inlet pipe; the other end of the second resin bed is connected to one end of the second sub-water outlet pipe; one end of the third resin bed is connected to one end of the third sub-water inlet pipe; the other end of the third resin bed is connected to one end of the third sub-water outlet pipe; one end of the fourth resin bed is connected to one end of the fourth sub-water inlet pipe; the other end of the fourth resin bed is connected to one end of the fourth sub-water outlet pipe; The other end of the first sub-water inlet pipe, the other end of the second sub-water inlet pipe, the other end of the third sub-water inlet pipe and the other end of the fourth sub-water inlet pipe are respectively connected to the main water inlet pipe; The first water inlet valve is arranged on the first sub-water inlet pipe; the second water inlet valve is arranged on the second sub-water inlet pipe; the third water inlet valve is arranged on the third sub-water inlet pipe; the fourth water inlet valve is arranged on the fourth sub-water inlet pipe; A fifth water inlet valve is provided on the main water inlet pipe after the position communicating with the fourth sub-water inlet pipe; The other end of the first sub-water outlet pipe, the other end of the second sub-water outlet pipe, the other end of the third sub-water outlet pipe and the other end of the fourth sub-water outlet pipe are respectively connected to the main water outlet pipe; The main water outlet pipe is provided with a first water outlet valve between a position connected with the first sub-water outlet pipe and a position connected with the second sub-water outlet pipe; the main water outlet pipe is provided with a second water outlet valve between a position connected with the second sub-water outlet pipe and a position connected with the third sub-water outlet pipe; the main water outlet pipe is provided with a third water outlet valve between a position connected with the third sub-water outlet pipe and a position connected with the fourth sub-water outlet pipe; The first auxiliary valve is arranged on the first auxiliary pipe; the second auxiliary valve is arranged on the second auxiliary pipe; the third auxiliary valve is arranged on the third auxiliary pipe; One end of the first auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the first sub-water inlet pipe and the position where the main water inlet pipe is connected to the second sub-water inlet pipe; the other end of the first auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the first sub-water outlet pipe and the first water outlet valve; One end of the second auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the second sub-water inlet pipe and the position where the main water inlet pipe is connected to the third sub-water inlet pipe; the other end of the second auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the second sub-water outlet pipe and the second water outlet valve; One end of the third auxiliary pipe is connected to the main water inlet pipe and is located between the position where the main water inlet pipe is connected to the third sub-water inlet pipe and the position where the main water inlet pipe is connected to the fourth sub-water inlet pipe; the other end of the third auxiliary pipe is connected to the main water outlet pipe and is located between the position where the main water outlet pipe is connected to the third sub-water outlet pipe and the third water outlet valve.

6. A method for removing impurities in a high temperature and high pressure irradiation test circuit, applied to the system of claim 1, characterized in that: include: When it is detected that the boron ions in the boron-lithium water in the test loop exceed the standard, the boron-lithium water is controlled to enter the second resin bed and the third resin bed connected in series, or to enter the second resin bed and the fourth resin bed connected in series; When the anions other than boron ions in the boron-lithium water in the test loop exceed the standard, the flow rate of the boron-lithium water is controlled to increase, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel; When Li in boron-lithium water in the test circuit is detected + When the content exceeds the standard, the boron-lithium water is controlled to enter the first resin bed and the third resin bed connected in series, or to enter the first resin bed and the fourth resin bed connected in series; When the boron-lithium water in the test circuit is detected to remove Li + When the cations other than the above are exceeded, the flow rate of the boron-lithium water is controlled to be increased, and the boron-lithium water is controlled to enter the third resin bed and the fourth resin bed connected in series or in parallel.

7. The method according to claim 6, characterized in that When no excessive ions are detected in the test loop, the boron-lithium water is controlled to enter the third resin bed or the fourth resin bed at a flow rate not less than a preset flow rate; the preset flow rate is the total volume of the test loop divided by 24 hours.

8. The method according to claim 6, characterized in that The step of controlling the boron-lithium water to enter the second resin bed and the third resin bed connected in series comprises: controlling the second water inlet valve, the second auxiliary valve, the third water inlet valve and the third water outlet valve to be opened, and controlling the first water inlet valve, the first auxiliary valve, the first water outlet valve, the second water outlet valve, the fourth water inlet valve, the third auxiliary valve and the fifth water inlet valve to be closed; The step of controlling boron-lithium water to enter the second resin bed and the fourth resin bed connected in series includes: controlling the second water inlet valve, the second water outlet valve, the third auxiliary valve and the fourth water inlet valve to open, and controlling the first water inlet valve, the third water inlet valve, the fifth water inlet valve, the first water outlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to close.

9. The method according to claim 6, characterized in that The step of controlling the boron-lithium water to enter the first resin bed and the third resin bed connected in series comprises: controlling the first water inlet valve, the first water outlet valve, the second auxiliary valve, the third water inlet valve, and the third water outlet valve to be opened, and controlling the second water inlet valve, the fourth water inlet valve, the second water outlet valve, the third auxiliary valve, the fifth water outlet valve, and the first auxiliary valve to be closed; The step of controlling boron lithium water to enter the first resin bed and the fourth resin bed connected in series includes: controlling the first water inlet valve, the first water outlet valve, the second water outlet valve, the third auxiliary valve and the fourth water inlet valve to open, and controlling the second water inlet valve, the third water inlet valve, the fifth water inlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to close.

10. The method according to claim 6, characterized in that The step of controlling the boron-lithium water to enter the third resin bed and the fourth resin bed connected in series comprises: controlling the third water inlet valve, the fourth water inlet valve and the third auxiliary valve to be opened, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the third water outlet valve, the first auxiliary valve and the second auxiliary valve to be closed; The step of controlling boron lithium water to enter the third resin bed and the fourth resin bed connected in parallel includes: controlling the third water inlet valve, the fourth water inlet valve and the third water outlet valve to open, and controlling the first water inlet valve, the second water inlet valve, the fifth water inlet valve, the first water outlet valve, the second water outlet valve, the first auxiliary valve, the second auxiliary valve and the third auxiliary valve to close.

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