A dissolution device and method for nuclide migration test in underground laboratory

Abstract

The present invention belongs to the technical field of underground laboratory nuclide migration test, and specifically relates to a dissolution device and method for underground laboratory nuclide migration test. The dissolution device is used for a long-term dissolution test of nuclides in groundwater in an underground laboratory nuclide migration test, and the groundwater is groundwater obtained from a borehole at the location of an underground laboratory for deep geological safety disposal of high-level radioactive waste. The dissolution device is cylindrical in shape and matches the borehole in the underground laboratory, and includes a dissolution tank (3) connected to the groundwater and a sample bottle (12) connected to the dissolution tank (3). The dissolution tank (3) is also connected to a source liquid tank (13) for underground laboratory nuclide migration test; the dissolution tank (3) is used to obtain a dissolution solution of the nuclides, and the dissolution solution is sent to the sample bottle (12) and the source liquid tank (13); the present invention can be used for a long-term dissolution test of nuclides in low-oxygen groundwater in a real geological environment, and automatically collects test samples under low-oxygen conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of underground laboratory nuclide migration test, and in particular relates to a dissolution device and method for underground laboratory nuclide migration test. Background Art

[0002] Before the implementation of deep geological disposal of high-level radioactive waste, safety analysis and evaluation of the pre-selected site and deep geological disposal repository are required. The construction of underground laboratories and field tests can provide the most direct technical and experience support for the design, construction, operation and safety evaluation analysis of deep geological disposal repository. Solubility experiment is one of the important topics in the research of deep geological safe disposal of high-level radioactive waste, involving the source term of nuclide migration. In ordinary laboratories, general dissolution experiments are very convenient to operate manually, but in underground laboratories, conducting nuclide solubility determination experiments in underground laboratories requires long-term closed technology and automatic sampling technology. The development of dissolution devices and methods in the field monitoring equipment of underground laboratory nuclide migration tests makes long-term dissolution tests of nuclides in undisturbed groundwater possible, and the data obtained will provide a scientific basis for the safety evaluation of deep geological safe disposal repository for high-level radioactive waste. At present, there are no such devices and methods in China. Summary of the invention

[0003] The object of the present invention is to provide a device capable of carrying out a long-term dissolution test of nuclides in real undisturbed groundwater, automatically collecting test samples under hypoxic conditions, and making nuclide solubility determination data more reliable.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is a dissolution device for underground laboratory nuclide migration test, which is used for long-term dissolution test of nuclides in groundwater in underground laboratory nuclide migration test, wherein the groundwater is groundwater obtained from a borehole at the location of an underground laboratory for deep geological safety disposal of high-level radioactive waste, wherein the outer shape is a cylinder, matching the borehole in the underground laboratory, and is installed in the long-term monitoring equipment of nuclide migration in the underground laboratory, including a dissolution tank connected to the groundwater and a sample bottle connected to the dissolution tank, and the dissolution tank is also connected to a source liquid tank for the underground laboratory nuclide migration test; the dissolution tank is used to obtain a dissolution solution of the nuclides, and the dissolution solution is sent into the sample bottle and the source liquid tank; the dissolution solution is obtained by dissolving a solid phase containing the nuclides placed in advance by the groundwater in the dissolution tank.

[0005] Furthermore, the dissolution tank is connected to the original groundwater inlet through a first pipeline, and the groundwater enters the dissolution tank through the original groundwater inlet via the first pipeline. A first solenoid valve is provided on the first pipeline, and the first solenoid valve is a two-position two-way solenoid valve.

[0006] Furthermore, the dissolution tank is connected to the switching valve via a fifth pipeline, the switching valve is connected to the source liquid tank via a seventh pipeline, and the switching valve is connected to the sample bottle via an eighth pipeline.

[0007] Furthermore, a fourth solenoid valve and an injection pump are arranged in series on the fifth pipeline; the fourth solenoid valve is a two-position two-way solenoid valve, which is close to the dissolution tank.

[0008] Furthermore, it also includes a waste liquid pool connected to the dissolution pool, a peristaltic pump and a second solenoid valve are arranged in series between the dissolution pool and the waste liquid pool; the dissolution pool is connected to the second solenoid valve through a second pipeline, the second solenoid valve is connected to the waste liquid pool through a third pipeline, the peristaltic pump is arranged on the second pipeline, and the second solenoid valve is a two-position three-way solenoid valve.

[0009] Furthermore, the second solenoid valve is also connected to the dissolution tank through a fourth pipeline.

[0010] Furthermore, it also includes a nitrogen device, which is connected to the switching valve through a ninth pipeline and is also connected to the dissolution tank through a tenth pipeline. A third solenoid valve is provided on the tenth pipeline, and the third solenoid valve is a two-position two-way solenoid valve.

[0011] Furthermore, the switching valve is connected to the waste liquid pool via a sixth pipeline.

[0012] To achieve the above objectives, the present invention also discloses a dissolution method for an underground laboratory nuclide migration test using a dissolution device for an underground laboratory nuclide migration test as described above, comprising the following steps:

[0013] Step S1, injecting the groundwater into the dissolution tank;

[0014] Step S2, performing a nuclide dissolution test in the dissolution tank and sampling the dissolved liquid in the dissolution tank;

[0015] Step S3, the dissolving tank injects the dissolving liquid into the source liquid tank.

[0016] further,

[0017] The step S1 includes: installing the dissolution device into the underground laboratory nuclide migration long-term monitoring equipment, placing the solid phase material containing the nuclide in the dissolution tank in advance, opening the first solenoid valve and the second solenoid valve, pumping the groundwater in the original groundwater inlet into the dissolution tank through the peristaltic pump, draining the excess groundwater into the waste liquid tank, and then closing all valves;

[0018] The step S2 includes: opening the third solenoid valve and the fourth solenoid valve, and extracting the dissolved liquid in the dissolved pool by using the syringe pump; closing the fourth solenoid valve and the third solenoid valve, switching the switching valve to the position of the waste liquid pool, discharging a portion of the dissolved liquid extracted by the syringe pump into the waste liquid pool, and then switching the switching valve to the position of the sample bottle, and discharging another portion of the dissolved liquid remaining in the syringe pump into the sample bottle; switching the switching valve to the position of the waste liquid pool, using the nitrogen provided by the nitrogen device to blow out the residual liquid in the switching valve, resetting the switching valve to complete the sampling operation, and the dissolved liquid in the sample bottle is used for concentration measurement, and the sampling operation is performed regularly until the concentration of the nuclide in the dissolved liquid is stabilized;

[0019] The step S3 includes: after the nuclide dissolution test is completed and the concentration of the nuclide in the dissolved solution is stabilized, the third solenoid valve and the fourth solenoid valve are opened, and a quantitative amount of the dissolved solution in the dissolved solution pool is extracted by the injection pump; the fourth solenoid valve and the third solenoid valve are closed, the switching valve is switched to the position of the source liquid pool, and the dissolved solution in the injection pump is discharged into the source liquid pool; the switching valve is switched to the position of the waste liquid pool, and the residual liquid in the switching valve is blown out by the nitrogen provided by the nitrogen device, and the switching valve is reset.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention is used for long-term dissolution test of nuclides in hypoxic groundwater in real geological environment, and automatically collects test samples under hypoxic conditions. The data obtained will provide a scientific basis for the safety evaluation of deep geological safe disposal repository for high-level radioactive waste.

[0022] 2. The dissolution device in the present invention is in the shape of an elongated cylinder, which matches the borehole in the underground laboratory and is suitable for long-term experimental research in the underground laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a dissolution device for underground laboratory nuclide migration test described in a specific embodiment of the present invention;

[0024] In the figure: 1-original groundwater inlet, 2-first solenoid valve (two-position three-way solenoid valve), 3-dissolution tank, 4-peristaltic pump, 5-second solenoid valve (two-position three-way solenoid valve), 6-waste liquid tank, 7-nitrogen device, 8-third solenoid valve (two-position two-way solenoid valve), 9-fourth solenoid valve (two-position two-way solenoid valve), 10-injection pump, 11-switching valve, 12-sample bottle, 13-source liquid tank, 14-first pipeline, 15-second pipeline, 16-third pipeline, 17-fourth pipeline, 18-fifth pipeline, 19-sixth pipeline, 20-seventh pipeline, 21-eighth pipeline, 22-ninth pipeline, 23-tenth pipeline. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 As shown, the present invention provides a dissolution device (hereinafter referred to as the dissolution device) for underground laboratory nuclide migration test, which is used for long-term dissolution test of nuclides in groundwater in underground laboratory nuclide migration test. The groundwater is groundwater obtained from a borehole at the location of an underground laboratory for deep geological safety disposal of high-level radioactive waste. The dissolution device is arranged in an underground laboratory nuclide migration long-term monitoring device for underground laboratory nuclide migration test. The shape is a cylinder, which matches the borehole in the underground laboratory, and includes a dissolution tank 3 connected to the groundwater and a sample bottle 12 connected to the dissolution tank 3. The dissolution tank 3 is also connected to a source liquid tank 13 for underground laboratory nuclide migration test; the dissolution tank 3 is used to obtain a dissolution solution of the nuclides, and the dissolution solution is sent into the sample bottle 12 and the source liquid tank 13; the dissolution solution is obtained by dissolving a solid phase containing nuclides placed in advance by the groundwater in the dissolution tank 3.

[0027] The dissolution tank 3 is connected to the original groundwater inlet 1 through the first pipeline 14. The groundwater enters the dissolution tank 3 through the original groundwater inlet 1 via the first pipeline 14. The first solenoid valve 2 is provided on the first pipeline 14. The first solenoid valve 2 is a two-position two-way solenoid valve.

[0028] The dissolution tank 3 is connected to the switching valve 11 through the fifth pipeline 18 , the switching valve 11 is connected to the source liquid tank 13 through the seventh pipeline 20 , and the switching valve 11 is connected to the sample bottle 12 through the eighth pipeline 21 .

[0029] A fourth solenoid valve 9 and an injection pump 10 are arranged in series on the fifth pipeline 18 ; the fourth solenoid valve 9 is a two-position two-way solenoid valve and is close to the dissolution tank 3 .

[0030] It also includes a waste liquid pool 6 connected to the dissolution pool 3, and a peristaltic pump 4 and a second solenoid valve 5 are arranged in series between the dissolution pool 3 and the waste liquid pool 6; the dissolution pool 3 is connected to the second solenoid valve 5 through a second pipeline 15, and the second solenoid valve 5 is connected to the waste liquid pool 6 through a third pipeline 16, the peristaltic pump 4 is arranged on the second pipeline 15, and the second solenoid valve 5 is a two-position three-way solenoid valve.

[0031] The second solenoid valve 5 is also connected to the dissolution tank 3 via a fourth pipeline 17 .

[0032] It also includes a nitrogen device 7, which is connected to the switching valve 11 through a ninth pipeline 22 and is also connected to the dissolution tank 3 through a tenth pipeline 23. A third solenoid valve 8 is provided on the tenth pipeline 23, and the third solenoid valve 8 is a two-position two-way solenoid valve.

[0033] The switching valve 11 is connected to the waste liquid tank 6 via a sixth pipeline 19 .

[0034] The present invention also discloses a dissolution method for an underground laboratory nuclide migration test for a dissolution device for an underground laboratory nuclide migration test as described above, comprising the following steps:

[0035] Step S1, injecting groundwater into the dissolution tank 3;

[0036] Step S2, performing a nuclide dissolution test in the dissolution tank 3 and sampling the dissolved liquid in the dissolution tank 3;

[0037] Step S3 , the dissolving tank 3 injects the dissolving liquid into the source liquid tank 13 .

[0038] Step S1 includes: installing the dissolution device into the long-term monitoring equipment for nuclide migration in the underground laboratory, placing solid phase materials containing nuclides in the dissolution tank 3 in advance, opening the first solenoid valve 2 and the second solenoid valve 5, pumping groundwater in the original groundwater inlet 1 into the dissolution tank 3 through the peristaltic pump 4, draining the excess groundwater into the waste liquid tank 6, and then closing all valves;

[0039] Step S2 includes: opening the third solenoid valve 8 and the fourth solenoid valve 9, and extracting the dissolved liquid in the dissolution tank 3 by using the syringe pump 10; closing the fourth solenoid valve 9 and the third solenoid valve 8, switching the switching valve 11 to the position of the waste liquid tank 6, discharging a part (a small amount) of the dissolved liquid extracted by the syringe pump 10 into the waste liquid tank 6 (completed by the syringe pump 10 itself), and then switching the switching valve 11 to the position of the sample bottle 12, and discharging the other part of the dissolved liquid remaining in the syringe pump 10 into the sample bottle 12 (completed by the syringe pump 10 itself); switching the switching valve 11 to the position of the waste liquid tank 6, using the nitrogen provided by the nitrogen device 7 to blow out the residual liquid in the switching valve 11, resetting the switching valve 11 to complete the sampling operation, and the dissolved liquid in the sample bottle 12 is used for concentration measurement, and the sampling operation is performed regularly until the concentration of the nuclide in the dissolved liquid is stable;

[0040] Step S3 includes: after the nuclide dissolution test is completed and the concentration of the nuclide in the dissolved solution is stabilized, the third solenoid valve 8 and the fourth solenoid valve 9 are opened, and a quantitative amount of dissolved solution in the dissolved solution pool 3 is extracted by the injection pump 10; the fourth solenoid valve 9 and the third solenoid valve 8 are closed, the switching valve 11 is switched to the position of the source liquid pool 13, and the dissolved solution in the injection pump 10 is discharged into the source liquid pool 13 (completed by the injection pump 10 itself); the switching valve 11 is switched to the position of the waste liquid pool 6, and the residual liquid in the switching valve 11 is blown out by the nitrogen provided by the nitrogen device 7, and the switching valve 11 is reset.

[0041] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the technical innovation scope of the present invention.

Claims

1. A dissolution device for underground laboratory nuclide migration test, used for long-term dissolution test of nuclides in groundwater in underground laboratory nuclide migration test, wherein the groundwater is groundwater obtained from a borehole at the location of an underground laboratory for deep geological safety disposal of high-level radioactive waste, and is characterized by: The device has a cylindrical shape, matches the borehole in the underground laboratory, and is installed in the long-term monitoring equipment for nuclide migration in the underground laboratory. The device comprises a dissolution tank (3) connected to the groundwater and a sample bottle (12) connected to the dissolution tank (3). The dissolution tank (3) is also connected to a source liquid tank (13) used for the nuclide migration test in the underground laboratory. The dissolution tank (3) is used to obtain a dissolution liquid of the nuclide, and the dissolution liquid is sent to the sample bottle (12) and the source liquid tank (13). The dissolution liquid is obtained by dissolving a solid phase containing the nuclide placed in advance by the groundwater in the dissolution tank (3). The dissolution tank (3) is connected to the original groundwater inlet (1) via a first pipeline (14); the groundwater enters the dissolution tank (3) via the original groundwater inlet (1) and the first pipeline (14); a first solenoid valve (2) is provided on the first pipeline (14); the first solenoid valve (2) is a two-position two-way solenoid valve; The dissolution pool (3) is connected to the switching valve (11) via a fifth pipeline (18), the switching valve (11) is connected to the source liquid pool (13) via a seventh pipeline (20), and the switching valve (11) is connected to the sample bottle (12) via an eighth pipeline (21); The fifth pipeline (18) is provided with a fourth solenoid valve (9) and a syringe pump (10) in series; the fourth solenoid valve (9) is a two-position two-way solenoid valve and is close to the dissolution tank (3); It also comprises a waste liquid pool (6) connected to the dissolution pool (3), a peristaltic pump (4) and a second solenoid valve (5) being arranged in series between the dissolution pool (3) and the waste liquid pool (6); the dissolution pool (3) is connected to the second solenoid valve (5) via a second pipeline (15), the second solenoid valve (5) is connected to the waste liquid pool (6) via a third pipeline (16), the peristaltic pump (4) is arranged on the second pipeline (15), and the second solenoid valve (5) is a two-position three-way solenoid valve; The second solenoid valve (5) is also connected to the dissolution tank (3) via a fourth pipeline (17); It also comprises a nitrogen device (7), the nitrogen device (7) being connected to the switching valve (11) via a ninth pipeline (22), and being connected to the dissolution tank (3) via a tenth pipeline (23), a third solenoid valve (8) being provided on the tenth pipeline (23), the third solenoid valve (8) being a two-position two-way solenoid valve.

2. A dissolution device for underground laboratory nuclide migration test as claimed in claim 1, characterized in that: The switching valve (11) is connected to the waste liquid pool (6) via a sixth pipeline (19).

3. A dissolution method for an underground laboratory nuclide migration test for a dissolution device for an underground laboratory nuclide migration test as claimed in claim 2, comprising the following steps: Step S1, injecting the groundwater into the dissolution tank (3); Step S2, performing a nuclide dissolution test in the dissolution tank (3), and sampling the dissolution liquid in the dissolution tank (3); Step S3, the dissolving tank (3) injects the dissolving liquid into the source liquid tank (13).

4. The dissolution method for underground laboratory nuclide migration test as claimed in claim 3, characterized in that: The step S1 includes: installing the dissolution device in the underground laboratory nuclide migration long-term monitoring equipment, placing the solid phase material containing the nuclide in the dissolution tank (3) in advance, opening the first solenoid valve (2) and the second solenoid valve (5), pumping the groundwater in the original groundwater inlet (1) into the dissolution tank (3) through the peristaltic pump (4), draining the excess groundwater into the waste liquid tank (6), and then closing all valves; The step S2 includes: opening the third solenoid valve (8) and the fourth solenoid valve (9), and using the syringe pump (10) to extract the dissolved liquid in the dissolved pool (3); closing the fourth solenoid valve (9) and the third solenoid valve (8), switching the switching valve (11) to the position of the waste liquid pool (6), discharging a portion of the dissolved liquid extracted by the syringe pump (10) into the waste liquid pool (6), and then switching the switching valve (11) to the position of the sample bottle (12), and discharging another portion of the dissolved liquid remaining in the syringe pump (10) into the sample bottle (12); switching the switching valve (11) to the position of the waste liquid pool (6), using the nitrogen provided by the nitrogen device (7) to blow out the residual liquid in the switching valve (11), resetting the switching valve (11) to complete the sampling operation, and the dissolved liquid in the sample bottle (12) is used for concentration measurement, and the sampling operation is performed regularly until the concentration of the nuclide in the dissolved liquid is stable; The step S3 includes: after the nuclide dissolution test is completed and the concentration of the nuclide in the dissolved solution is stabilized, the third solenoid valve (8) and the fourth solenoid valve (9) are opened, and a fixed amount of the dissolved solution in the dissolved pool (3) is extracted by using the injection pump (10); the fourth solenoid valve (9) and the third solenoid valve (8) are closed, the switching valve (11) is switched to the position of the source liquid pool (13), and the dissolved solution in the injection pump (10) is discharged into the source liquid pool (13); the switching valve (11) is switched to the position of the waste liquid pool (6), and the residual liquid in the switching valve (11) is blown out by using the nitrogen provided by the nitrogen device (7), and the switching valve (11) is reset.

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