A packaging shell for containing uranium tetrafluoride container

Abstract

The present invention relates to a packaging shell for storing and transporting uranium tetrafluoride powder containers with an enrichment level not exceeding 20%. The packaging shell is cylindrical and consists of an upper shell and a lower shell. The upper and lower shells are hollow structures, each having an inner and outer metal shell. The inner and outer metal shells are filled with aluminum silicate fibers. An upper flange is welded to the outer metal shell of the upper shell, an upper pressure plate is welded to the inner and outer metal shells of the upper shell, a lower flange is welded to the outer and inner metal shells of the lower shell, and a lower pressure plate is welded to the inner and outer metal shells of the lower shell. The upper and lower shells are connected by fasteners via the upper and lower flanges. A sealing gasket A is installed between the upper and lower pressure plates, and a sealing gasket B is installed between the lower and upper flanges. Eyebolts are installed between the upper and lower flanges, and the eyebolts are welded to the upper flange. The bottom of the lower shell is a supporting and thermal insulation assembly. The packaging shell can also be used for storing and transporting uranium trioxide powder and uranium dioxide powder containers with an enrichment level not exceeding 20%.

Description

Technical Field

[0001] The present invention relates to a packaging shell for storing and transporting containers of uranium tetrafluoride (powder) with an enrichment level not exceeding 20%. The packaging shell can also be used for storing and transporting containers of uranium trioxide (powder) and uranium dioxide (powder) with an enrichment level not exceeding 20%. The packaging shell is suitable for road and rail transportation of the above three types of uranium compound (powder) product containers, and belongs to a transportation system for uranium compound powder with an enrichment level not exceeding 20%. Background Art

[0002] This packaging is primarily used for transporting uranium tetrafluoride (powder) between nuclear fuel element plants and users. According to the requirements for radioactive materials in GB11806-2019, "Regulations for the Safe Transport of Radioactive Materials," uranium tetrafluoride (powder) container transport packages must pass appropriate safety tests before they can be transported.

[0003] Currently, there are no packaging cases for the storage and transportation of uranium tetrafluoride (powder) containers with an enrichment level of no more than 20% internationally, and no packaging cases for the storage and transportation of uranium trioxide (powder) and uranium dioxide (powder) containers with an enrichment level of no more than 20% in my country. As a nuclear power, my country urgently needs to develop packaging cases with independent intellectual property rights to effectively drive the development of its nuclear industry. Summary of the Invention

[0004] The object of the present invention is to invent a packaging shell for storing and transporting uranium tetrafluoride (powder) containers with an enrichment content not exceeding 20%. The packaging shell can also be used for storing and transporting uranium trioxide (powder) and uranium dioxide (powder) containers with an enrichment content not exceeding 20%.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A packaging shell for containing a uranium tetrafluoride container, the packaging shell is cylindrical and consists of an upper shell and a lower shell. The upper shell and the lower shell are hollow structures, and both the inner and outer shells are metal shells. The inner and outer metal shells are filled with aluminum silicate fibers. The upper flange is welded to the outer metal shell of the upper shell, the upper pressure plate is welded to the inner and outer metal shells of the upper shell, the lower flange is welded to the outer metal shell of the lower shell, and the lower pressure plate is welded to the inner and outer metal shells of the lower shell. The upper shell and the lower shell are connected by fasteners through the upper flange and the lower flange. A sealing gasket A is installed between the upper and lower pressure plates, and a sealing gasket B is installed between the lower flange and the upper flange. Eye screws are installed on the upper flange and the lower flange, and the eye screws are welded to the upper flange. The bottom of the lower shell is a support and insulation component. The outer part of the support and insulation component is a steel plate, and the inner part is a steel ring. A non-metallic anti-collision pad is bonded to the inner part of the steel ring. The lower part of the support and insulation component is an insulation board, which is bonded to the support ring. The support ring is respectively welded to the inner and outer metal shells of the lower shell. A base is provided below the lower shell.

[0007] The filling density of the aluminum silicate fiber is 180±15% kg / m 3 .

[0008] The aluminum silicate fibers are cut into circular plates or rings and pressed into the filling area layer by layer. Local discontinuous areas are filled with loose blankets, and each layer of loose blanket needs to be compacted.

[0009] The fasteners include bolts, nuts, and washers. A through hole with a diameter of 2 mm is opened at the tail of the bolt for lead sealing.

[0010] There is a height difference between the sealing gasket A and the sealing gasket B, forming a labyrinth sealing structure.

[0011] There is a height difference between the fastener and the top of the upper shell.

[0012] There are 6 steel plates.

[0013] A plurality of through holes are formed on the base.

[0014] The beneficial effects achieved by the present invention are:

[0015] The packaging shell can ensure that the UF4 transport container (including the packaging shell and the inner container of the material) remains in a safety critical state and meets the containment requirements after undergoing safety tests under normal and accident conditions specified in GB11806-2019 "Regulations on the Transport of Radioactive Materials".

[0016] The present invention aims to invent a packaging shell for storing and transporting uranium tetrafluoride (powder) containers with an enrichment level not exceeding 20%. This packaging shell can also be used to store and transport uranium trioxide (powder) and uranium dioxide (powder) containers with an enrichment level not exceeding 20%. This fills the gap in domestic and international packaging shells for such transport containers, ensuring my country's technological advancement in the storage and transportation of radioactive materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram A of the uranium tetrafluoride transport container packaging shell;

[0018] Figure 2 Schematic diagram B of the uranium tetrafluoride transport container packaging shell;

[0019] Figure 3 Schematic diagram of the labyrinth seal structure;

[0020] Figure 4 Schematic diagram A of the support insulation assembly;

[0021] Figure 5 Schematic diagram B for supporting thermal insulation components;

[0022] In the figure: 1, lower cladding 2, aluminum silicate fiber 3, sealing gasket A 4, sealing gasket B 5, fasteners 6, upper cladding 7, lifting screws 8, upper flange 9, lower flange 10, upper pressure plate 11, lower pressure plate 12, support and thermal insulation assembly 13, base 14, lead seal 15, steel plate 16, steel ring 17, thermal insulation board 18, non-metallic anti-collision pad 19, support ring. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The packaging shell is cylindrical and consists of an upper shell 6 and a lower shell 1. The upper shell 6 and the lower shell 1 are hollow structures. Both the inner and outer shells are metal shells. The interior is filled with 3# aluminum silicate fiber 2. The 3# aluminum silicate fiber has a buffering and thermal insulation effect. The filling density of the 3# aluminum silicate fiber in the upper and lower shells is 180±15% kg / m 3 .

[0025] When filling, the aluminum silicate fiber is cut into circular plates or rings according to the filling area, and then pressed into the filling area layer by layer. Local discontinuous areas are filled with loose blankets. Each time a layer of aluminum silicate fiber blanket is pressed in, it needs to be compacted with a special tool. After filling, the weight of the parts is weighed to ensure that the filling density meets the requirements.

[0026] The upper cladding 6 is composed of 3# aluminum silicate fiber 2, an upper flange 8, and an upper pressing plate 10. The upper flange 8 is welded to the outer metal shell of the upper cladding 6, and the upper pressing plate 10 is welded to the inner and outer metal shells of the upper cladding 6.

[0027] The lower cladding 1 is composed of 3# aluminum silicate fiber 2, lower flange 9, lower pressure plate 11, support ring assembly 12, and base 13. The lower flange 9 is welded to the outer metal shell of the lower cladding 1, and the lower pressure plate 11 is welded to the inner and outer metal shells of the lower cladding 1.

[0028] The upper shell 6 and the lower shell 1 are connected by upper flange 8 and lower flange 9 using fasteners 5, which include high-strength bolts, nuts, and washers. A through hole with a diameter of 2 mm is opened at the end of the bolt for the lead seal 14.

[0029] A sealing gasket A3 is installed between the upper pressing plate 10 and the lower pressing plate 11, and a high-temperature resistant sealing gasket B4 is installed between the lower flange 9 and the upper flange 8.

[0030] The upper and lower cladding shells 6 and 1 utilize a labyrinth seal structure. The upper and lower flanges 8 and 11 compress the high-temperature-resistant gasket A3, providing external sealing. Internally, the upper and lower pressure plates 10 and 11 compress the high-temperature-resistant gasket B4, providing internal sealing. The height difference between the inner and outer seals creates a labyrinth seal structure, ensuring excellent sealing and thermal insulation in the event of transport accidents (including falls and fires).

[0031] There is a height difference between the fastener 5 and the top of the upper shell 6, which protects the fastener 5 in the event of a drop due to a transportation accident.

[0032] The upper flange 8 and the lower flange are installed with eye screws 7, and the eye screws 7 are welded to the upper flange 8.

[0033] The bottom support and insulation assembly 12 is used to position the uranium tetrafluoride (powder) container during transportation. The support and insulation assembly 12 consists of six steel plates 15 on the outside and a steel ring 16 on the inside. A non-metallic crash pad 18 is bonded to the ring's interior. The lower portion of the ring is an insulation plate 17, which is bonded to a support ring 19. The support ring 19 is welded to the inner and outer metal shells of the lower cladding 1, respectively. The crash pad 18 and insulation plate 17 primarily protect the uranium tetrafluoride (powder) container, preventing scratches during transportation and overheating in the event of a fire. The support ring 19 strengthens the rigidity of the metal shell within the lower cladding 1, preventing excessive deformation of the inner shell during transportation accidents, thereby preventing criticality accidents.

[0034] A base 13 is provided below the lower cladding 1. The base 13 is provided with a plurality of through holes. During transportation, fasteners are installed here to fix the container to the transportation vehicle, thereby playing the role of fastening and fixing the transportation container.

[0035] The packaging shell designed in the present invention can be used for storing and transporting uranium tetrafluoride (powder) containers with an enrichment level not exceeding 20%, as well as uranium trioxide (powder) and uranium dioxide (powder) containers with an enrichment level not exceeding 20%. The packaging shell consists of upper and lower cladding parts, which are connected by fasteners through upper and lower flanges, with a high-temperature resistant sealing gasket installed between the upper and lower flanges.

[0036] The present invention is directed to a packaging shell for storing and transporting uranium tetrafluoride (powder) containers with an enrichment level not exceeding 20%. The packaging shell can also be used to store and transport uranium trioxide (powder) and uranium dioxide (powder) containers with an enrichment level not exceeding 20%. Through the structural design of the packaging shell, the overall safety and reliability of the container transportation are ensured.

Claims

1. A packaging shell for containing a uranium tetrafluoride container, characterized in that: The packaging shell is cylindrical and consists of an upper shell and a lower shell. The upper shell and the lower shell are hollow structures, and both the inside and the outside are metal shells. The inner and outer metal shells are filled with aluminum silicate fiber. The upper flange is welded to the outer metal shell of the upper shell, the upper pressure plate is welded to the inner and outer metal shells of the upper shell, the lower flange is welded to the outer metal shell of the lower shell, and the lower pressure plate is welded to the inner and outer metal shells of the lower shell. The upper shell and the lower shell are connected with fasteners through the upper flange and the lower flange. A sealing gasket A is installed between the upper pressure plate and the lower pressure plate, and a sealing gasket B is installed between the lower flange and the upper flange. The upper flange and the lower flange are installed with eye screws, and the eye screws are welded to the upper flange. The bottom of the lower shell is a support insulation component. The outside of the support insulation component is a steel plate, and the inside is a steel ring. A non-metallic anti-collision pad is bonded to the inside of the steel ring. The lower part of the support insulation component is an insulation board, and the insulation board is bonded to the support ring. The support ring is welded to the inner and outer metal shells of the lower shell respectively, and a base is provided under the lower shell.

2. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: The filling density of the aluminum silicate fiber is 180±15% kg / m 3 .

3. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: The aluminum silicate fibers are cut into circular plates or rings and pressed into the filling area layer by layer. Local discontinuous areas are filled with loose blankets, and each layer of loose blanket needs to be compacted.

4. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: The fasteners include bolts, nuts, and washers. A through hole with a diameter of 2 mm is opened at the tail of the bolt for lead sealing.

5. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: There is a height difference between the sealing gasket A and the sealing gasket B, forming a labyrinth sealing structure.

6. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: There is a height difference between the fastener and the top of the upper shell.

7. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: There are 6 steel plates.

8. The packaging shell for containing a uranium tetrafluoride container according to claim 1, characterized in that: A plurality of through holes are formed on the base.

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