Inspection method of dangerous cargo bulk container for loading depleted uranium waste liquid

Abstract

The invention discloses an inspection method of a dangerous cargo bulk container for loading and transporting depleted uranium waste liquid, and relates to the technical field of radioactive container inspection, and the method comprises the following steps: S1, adding a drop test and a stacking test to a commercially available qualified dangerous cargo bulk container according to GB11806-2019 Safety Transport Regulation for Radioactive Articles; and S2, if the test result is qualified, determining that the dangerous cargo bulk container is an IP-2 cargo package meeting the requirements of GB11806-2019 Safety Transport Regulations for Radioactive Articles, and the dangerous cargo bulk container can be used for loading and transporting depleted uranium waste liquid. The method provided by the invention can be used for transporting the depleted uranium waste liquid only by using II-type dangerous cargo packaging containers produced by qualified manufacturers on the market to carry out falling and stacking tests and meet the requirements of GB11806-2019 Safety Transport Regulations for Radioactive Articles on IP-2 cargo packages, so that the container design and test cost is reduced, and the container research and development period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive container inspection, and in particular relates to an inspection method for a dangerous goods bulk container used for transporting depleted uranium waste liquid. Background Art

[0002] Depleted uranium waste liquid belongs to Class I low specific activity materials (LSA-I) among radioactive materials. When transporting depleted uranium waste liquid under non-exclusive use conditions, its transport containers should meet the requirements of IP-2 cargo packages in GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials". Currently, there are no special transportation containers in China. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide an inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid. The dangerous goods bulk containers that pass the inspection method meet the requirements of IP-2 cargo packages in GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials" and can be used to transport depleted uranium waste liquid without developing special radioactive material transport containers.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A method for inspecting a dangerous goods bulk container for transporting depleted uranium waste liquid comprises the following steps:

[0006] S1. According to GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials", drop tests and stacking tests are added to qualified bulk containers of dangerous goods on the market;

[0007] S2. If the test results are qualified, it is determined that the dangerous goods bulk container is an IP-2 cargo package that meets the requirements of GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials" and can be used to transport depleted uranium waste liquid.

[0008] Furthermore, in the above-mentioned inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid, the commercially available qualified dangerous goods bulk containers in step S1 meet the manufacturing and testing requirements for intermediate bulk containers in the United Nations Recommendations on the Transport of Dangerous Goods.

[0009] Furthermore, as mentioned above, for the inspection method of dangerous goods bulk containers used to transport depleted uranium waste liquid, the United Nations Recommendations on the Transport of Dangerous Goods has six test requirements for medium bulk containers, namely: bottom lifting test, stacking test, airtight test, hydraulic test, drop test and vibration test. Containers that pass the six tests are judged to be qualified dangerous goods bulk containers.

[0010] Further, in the above-mentioned inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid, the specific method of the drop test added in step S1 is:

[0011] At room temperature, fill the container to be tested with a test liquid of not less than 98% of its full capacity, and then reduce the temperature to -18°C or below (the test liquid should remain in liquid state at this temperature). The time interval from the test container leaving the state adjustment point to the implementation of the test shall not exceed 5 minutes;

[0012] The test container target platform is a hard, inelastic, smooth and horizontal plane. The test container falling posture is to ensure that the fulcrum is at the most vulnerable part of the bottom of the container. The drop height is 1.6 meters. Each test container sample falls once, and at least one container should fall on the edge where the drain valve is located at the bottom of the container. The gravity line of the test container sample should pass through the impact point of the fall; after the fall is completed, the test container sample needs to be lifted off the ground and kept for 5 minutes.

[0013] Furthermore, in the above-mentioned inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid, the drop test qualification standard added in step S1 is: the test result shows that there is no loss of the contents in the container and no leakage from the seal.

[0014] Further, in the above-mentioned inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid, the specific method of the stacking test added in step S1 is:

[0015] Place the bottom of the container to be tested on a horizontal hard ground, and then stack the test load for at least 24 hours. The load applied to the container should be at least 5 times the total maximum allowable mass of the same number of samples stacked on it during transportation.

[0016] Furthermore, in the inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid as described above, the qualified standard for the stacking test added in step S1 is: the test results show that there is no loss of the container contents and no permanent deformation that affects safe transportation.

[0017] Compared with the prior art, the inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid provided by the present invention has the following beneficial effects:

[0018] Based on the comparative study of the Class II dangerous goods packaging test in the United Nations Recommendations on the Transport of Dangerous Goods and the IP-2 cargo package test in GB11806-2019 Regulations for the Safe Transport of Radioactive Materials, the present invention innovatively proposes that there is no need to specially carry out the design, manufacture, test, and production of IP-2 transport containers suitable for loading depleted uranium wastewater. Only Class II dangerous goods packaging containers produced by qualified manufacturers on the market can be used for drop and stacking tests and meet the requirements of GB11806-2019 Regulations for the Safe Transport of Radioactive Materials for IP-2 cargo packages. After that, this type of container can be filed with the regulatory department and the transportation of depleted uranium waste liquid can be carried out. The method provided by the present invention reduces the cost of container design and testing, saves the container research and development cycle, and is also applicable to the filing of containers of the other three types of liquid radioactive materials in the regulatory department. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides a flowchart of a method for inspecting a bulk container of dangerous goods for transporting depleted uranium waste liquid in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Dangerous goods bulk containers that can hold depleted uranium waste liquid are designed for medium-risk materials and meet the "Manufacturing and testing requirements for medium-sized bulk containers in Chapter 6.5 of the United Nations Recommendations on the Transport of Dangerous Goods". The present invention provides an inspection method for dangerous goods bulk containers (belonging to Class II dangerous goods packaging) used as containers for transporting depleted uranium waste liquid. Dangerous goods bulk containers that pass the inspection method meet the requirements of IP-2 cargo packages in GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials" and can be used to transport depleted uranium waste liquid without the need to develop special radioactive material transport containers.

[0022] Dangerous goods bulk containers need to prove that they meet the IP-2 cargo packages required by GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials". Two more tests are required on top of the six tests in the "United Nations Recommendations on the Transport of Dangerous Goods".

[0023] In the "Manufacturing and testing requirements for intermediate bulk containers in Chapter 6.5 of the United Nations Recommendations on the Transport of Dangerous Goods", there are 6 tests that need to be carried out, including: bottom lifting test, stacking test, airtight test, hydraulic test, drop test and vibration test. The specific description of each test is as follows:

[0024] (1) Bottom lifting test

[0025] The bottom lifting test is to fill the container with water not less than 98% of its full capacity at room temperature, and apply a load to the container to 1.25 times its maximum permissible total mass, and the load should be evenly distributed. The container is then lifted and lowered twice by a forklift.

[0026] The passing standard for the bottom lifting test is: there is no loss of contents in the test results, and there is no permanent deformation that affects safe transportation.

[0027] (2) Stacking test

[0028] The stacking test is carried out in accordance with GB / T4857.3-2008 "Basic Tests for Packaging and Transport Packages Part 3: Static Load Stacking Test Method". The bottom of the container is placed on a horizontal hard ground, and then a uniformly distributed superimposed test load is applied for at least 24 hours. The load applied to the container should be at least 1.8 times the total maximum allowable mass of the same number of samples stacked on it during transportation.

[0029] Load application method: Place an appropriate load on a flat plate or a replica plate at the bottom of the sample box, and stack the flat plate on the container being tested.

[0030] The passing standard for the stacking test is: there is no loss of contents in the test results, and there is no permanent deformation that affects safe transportation.

[0031] (3) Airtightness test

[0032] The airtightness test is carried out according to GB / T 17344-1998 "Airtightness test method for packaging containers". The container is inflated to 20kPa and the container is completely immersed in a water tank or the detection solution is brushed on the outer surface of the container to observe whether bubbles are generated. The test lasts for 10 minutes. The leakage of the container is determined by checking whether bubbles are generated.

[0033] The passing standard for the airtight test is: no leakage in the test results.

[0034] (4) Hydraulic test

[0035] Fill the container with water, connect the pressure gauge to the pressure pump, and fix it to the tank mouth or other suitable position through the connecting parts. Pressurize the container to reach the test pressure of 100kPa, and maintain the pressure for 10 minutes. It is necessary to use water to continuously and gradually add to the required test pressure, and it must be ensured that the pressure in any part of the container is not lower than the specified test pressure. During the test, the container shall not be subject to any mechanical constraints.

[0036] The hydraulic test pass standard is: there is no leakage in the test results and there is no permanent deformation that affects safe transportation.

[0037] (5) Drop test

[0038] Fill the container with test liquid of not less than 98% of its full capacity at room temperature, then reduce the temperature of the container and its test liquid to -18°C or below (the test liquid should remain liquid at this temperature), and the time interval from the test container leaving the state adjustment point (-18°C) to the implementation of the test shall not exceed 5 minutes.

[0039] The test container target is a hard, inelastic, smooth and horizontal plane. The test container is dropped to ensure that the point of force is at the most vulnerable part of the bottom of the container. The drop height is 1.6 meters. Each test container sample is dropped once, and at least one container should fall on the edge where the drain valve is located at the bottom of the container. The gravity line of the test container sample should pass through the impact point of the drop. After the drop is completed, the test container sample needs to be lifted off the ground and kept for 5 minutes.

[0040] The pass standard of the drop test is: no loss of contents in the test results. The sample after the drop test should be safe for rescue transportation or disposal. If a small amount of contents leaks from the seal after the drop, it should be judged as qualified as long as there is no further leakage.

[0041] (6) Vibration test

[0042] Fill the test container sample with water to not less than 98% of its full capacity, place the test container sample in the center of the test machine platform, and use a vertical sine curve with a double amplitude of 25 (1 ± 5%) mm (peak-to-peak value). The test should be carried out for 1 hour at the required amplitude, and the frequency used should cause a part of the bottom of the sample to momentarily leave the vibration platform during a period of each cycle, so that there is at least one gap between the bottom of the sample and the test platform to allow a metal sheet (1.6 mm thick, 50 mm wide) to be intermittently fully inserted.

[0043] The vibration test pass standard is: there is no leakage or rupture in the test results, and there is no damage or failure of the structural parts.

[0044] The medium-sized bulk containers that pass the above six tests are determined to be qualified dangerous goods bulk containers. When using commercially available qualified dangerous goods bulk containers to transport depleted uranium waste liquid, it is also necessary to prove that the container meets the IP-2 cargo package requirements of GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials", then two additional tests are required, namely:

[0045] 1. Drop test

[0046] The drop test method is consistent with the drop test method in "Chapter 6.5 Construction and Testing Requirements for Intermediate Bulk Containers" in the "United Nations Recommendations on the Transport of Dangerous Goods" mentioned above, but the pass standard of this drop test is more stringent, and the pass standard is: the test results show that there is no loss of the contents and no leakage from the seal.

[0047] 2. Stacking test

[0048] The stacking test is carried out in accordance with GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials". Specifically, the bottom of the container is placed on a horizontal hard ground, and then the stacking test load lasts for at least 24 hours. The load applied to the container should be at least 5 times the total maximum permitted mass of the same number of samples stacked on it during transportation.

[0049] The passing standard for the stacking test is: the test results show that there is no loss of contents and no permanent deformation that affects safe transportation.

[0050] The inspection method for dangerous goods bulk containers for shipping depleted uranium waste liquid provided by the present invention, based on the comparative study of the Class II dangerous goods packaging test of the United Nations Recommendations on the Transport of Dangerous Goods and the IP-2 cargo package test of GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials", innovatively proposes that there is no need to specially carry out the design, manufacture, test and production of IP-2 type transport containers suitable for loading depleted uranium waste water, and only Class II dangerous goods packaging containers produced by qualified manufacturers on the market are used. After the drop and stacking tests are carried out and the requirements of GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials" on IP-2 cargo packages are met, the type of container can be filed with the regulatory department to carry out the transportation of depleted uranium waste liquid. The method provided by the present invention reduces the cost of container design and testing, saves the container research and development cycle, and is also applicable to the filing of containers of the other three types of liquid radioactive materials in the regulatory department.

[0051] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for inspecting a dangerous goods bulk container for transporting depleted uranium waste liquid, comprising the following steps: S1. According to GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials", drop tests and stacking tests are added to qualified bulk containers of dangerous goods on the market; S2. If the test results are qualified, it is determined that the dangerous goods bulk container is an IP-2 cargo package that meets the requirements of GB11806-2019 "Regulations for the Safe Transport of Radioactive Materials" and can be used to transport depleted uranium waste liquid.

2. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 1, characterized in that: The commercially available qualified dangerous goods bulk container described in step S1 meets the manufacturing and testing requirements for intermediate bulk containers in the United Nations Recommendations on the Transport of Dangerous Goods.

3. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 2, characterized in that: The United Nations Recommendations on the Transport of Dangerous Goods have six test requirements for intermediate bulk containers, namely: bottom lifting test, stacking test, air tightness test, hydraulic test, drop test and vibration test. Containers that pass the six tests are judged to be qualified dangerous goods bulk containers.

4. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 3 is characterized in that: The specific method of the drop test added in step S1 is: At room temperature, fill the container to be tested with a test liquid of not less than 98% of its full capacity, and then reduce the temperature to -18°C or below (the test liquid should remain in liquid state at this temperature). The time interval from the test container leaving the state adjustment point to the implementation of the test shall not exceed 5 minutes; The test container target platform is a hard, inelastic, smooth and horizontal plane. The test container falling posture is to ensure that the fulcrum is at the most vulnerable part of the bottom of the container. The drop height is 1.6 meters. Each test container sample falls once, and at least one container should fall on the edge where the drain valve is located at the bottom of the container. The gravity line of the test container sample should pass through the impact point of the fall; after the fall is completed, the test container sample needs to be lifted off the ground and kept for 5 minutes.

5. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 4, characterized in that: The drop test pass standard added in step S1 is: the test result shows that there is no loss of the contents of the container and no leakage from the seal.

6. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 5, characterized in that: The specific method of the stacking test added in step S1 is: Place the bottom of the container to be tested on a horizontal hard ground, and then stack the test load for at least 24 hours. The load applied to the container should be at least 5 times the total maximum allowable mass of the same number of samples stacked on it during transportation.

7. The inspection method for dangerous goods bulk containers for transporting depleted uranium waste liquid according to claim 6, characterized in that: The qualified standard of the stacking test added in step S1 is: the test result shows that there is no loss of the container contents and no permanent deformation that affects safe transportation.

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