KR100473389B1 - A container for storing and shipping radioactive materials - Google Patents

Abstract

The present invention relates to a container for storing radioactive material, in particular a packaging and transport container capable of safely transporting a hydrogen transport vessel (HTV) stored in the form of metal hydride for a long distance. The transport container configuration of the present invention consists of a secondary storage container for the leakage of the primary storage container in which the radioactive material is stored, and a drum container for external shock and fire. Secondary storage container of the present invention is characterized in that the spring device that can act as a shock absorber is installed on the inner wall and the upper, the inner bottom surface is provided with a metallic shock absorbing plate that can absorb the shock. And the drum container of the present invention is characterized in that the three layers in the order of the thermal insulation and the cushioning material in the order of ceramic fibers for high-temperature insulation, cross-linked PE (polyethylene) foam for low-temperature buffering and thermal insulation, and urethane foam for thermal insulation buffer. In particular, at the lower end of the drum container was configured a shock absorbing layer consisting of a rigid hard plate, a soft cross-linked PE foam, a hard ceramic board and a soft cross-linked PE foam to absorb the impact energy.

Description

A CONTAINER FOR STORING AND SHIPPING RADIOACTIVE MATERIALS}

The present invention relates to a transport container capable of safely transporting radioactive material, and in particular, the storage and transport container proposed by the present invention includes a hydrogen transport vessel (HTV; hydrogen transport vessel) in which tritium is stored in the form of metal hydride. And mounted on the aircraft, etc., it is suitable to move long distance safely. In addition, the storage and transport container proposed in the present invention is also suitable as a transport container for dangerous substances that should not leak even a small amount to the outside.

In domestic heavy-duty nuclear power plants, tritium, a radioactive substance, is produced in small quantities every year, and the tritium generated needs to be collected and safely transferred to other places outside the power plant area, such as temporary storage or waste disposal sites. Therefore, there has been a demand for the development of a transport container that can safely transport the tritium packaging and storage container due to the necessity.

Tritium to be transported in the present invention is stored in the form of a metal hydride in the HTV, the radiation dose of more than 1,080 Ci, the transport container corresponds to the type B transport container specified in the 2001-23 Korean Science and Technology Notice . Therefore, in order to use the type B container, it is required to go through the verification test for the normal conditions of transportation specified in domestic and foreign laws and regulations, and to carry out the verification test for the severe accident condition such as the vehicle overturning or the storage house fire. You have to go through. The main proof test items for Type B containers include impact tests such as a 9m drop test and a 1m rod drop (bar diameter 15cm, height 20cm) and a flame test that can withstand 30 minutes in an 800 ° C flame. These tests are carried out sequentially in a single container, and the transport container, which has been subjected to impact and flame testing, is finally left to stand for one week in the harsh external environment of 38 ° C and -40 ° C. In addition, a submersion test should be conducted to withstand 8 hours in 15m water in a separate transport container. Type B containers, which have been subjected to the various safety tests mentioned above, must have impact resistance, heat resistance and strict airtightness.

In general, the transport container for transporting the HTV is composed of a secondary sealing container surrounding the HTV and a steel drum for insulation and buffering. Known carriers for HTV are known as H1616 carriers from the Sandia Report (SANDIA91-2204) produced by Sandia National Laboratory, and HTV carriers developed by the Canadian Institute of Nuclear Research (AECL). Looking at the characteristics of the secondary storage container and the final outer drum surrounding the HTV in the conventional transport container in detail as follows.

First, the container of the outer steel drum generally uses a drum of low carbon steel. The drum is an open type with a lid, and after closing the secondary container, the drum lid is tightly closed with a locking ring. Between the drum inner wall and the secondary container is filled with an empty space with a heat insulating material and a buffer material to protect the inner container. Looking at the dangerous goods transport container shown in H1616 or US Pat. No. 4,100,860, it can be seen that polyurethane foam is widely used as a thermal insulation and cushioning material. Polyurethane foam is a material having better thermal insulation properties and excellent shock-absorbing effect than other organic foams such as styrene foam and phenolic foam. Therefore, polyurethane foam is widely used as a cushioning material in the packaging of various articles, and polyurethane foam is also commonly used for thermal insulation and cushioning in drums. However, polyurethane foam is not good thermal stability, it is pyrolyzed at a high temperature of more than 200 ° C. gas is likely to occur. Therefore, good results cannot be expected in a fire safety test at 800 ° C. To overcome this, the polyurethane foam is generally filled with a high temperature insulating film made of ceramic fibers on the drum inner shell of the urethane foam. Another disadvantage of polyurethane foam is that it is difficult to use as a cushioning material at temperatures below -30 ° C, such as in cold winters. Therefore, urethane foam is not a suitable buffer material at the weather resistance test of -40 ° C.

On the other hand, the secondary storage container mainly uses a metal container with a lid, and after the HTV is built in, the lid is tightly sealed by tightening the container with a plurality of bolts with a gasket or a rubber O-ring. In the secondary storage vessel, a connection valve for sampling the internal gas is installed in the lid of the secondary storage vessel, as shown in H1616 or US Pat. No. 4,972,087, to check for internal HTV leakage.

If you look at the packaging for HTV used by the Canadian Atomic Energy Research Institute (AECL), the Type B packaging in US 5,998,800, the radioactive waste packaging in US 4,972,087, and the dangerous goods packaging in US 4,100,860, Despite the fact that it is a specially designed transport container for virtual accidents, it is rare to use a device or material specifically designed for thermal insulation or cushioning inside the secondary storage container inside the drum. The H1616 is exceptionally designed to protect the HTV from external shocks by filling a piece of aluminum tube inside the secondary reservoir. Therefore, if the drum's outer shell is partially torn or punctured due to excessive external impact, the insulation and buffering function of the drum container cannot be expected. Is raised.

It is an object of the present invention to provide a container for the storage and transport of novel radioactive materials for solving the above problems.

In the present invention, in order to compensate for the shortcomings of the above-described polyurethane foam inside the steel drum at low temperatures, a crosslinked polyethylene (PE) foam having excellent low-temperature buffering capability was introduced between the ceramic insulating layer and the urethane foam layer. Cross-linked PE foam has the advantage of excellent buffering function at a low temperature of -70 ° C, even though it can withstand relatively high temperatures of about 120 ° C. Cross-linked PE foam has excellent elasticity and excellent shock absorbing effect. In order to absorb the impact energy in the bottom of the container subjected to a strong shock in preparation for the 9m free fall test or the 1m free fall test, a solid shock absorbing plate, a soft organic foam, a hard ceramic board, and a soft organic foam are used. A shock absorbing layer was made. When the shock absorbing plate and the ceramic board are subjected to a strong shock, they are deformed to absorb energy sufficiently. In addition, the ceramic board has an advantage that can be used as a heat insulating reinforcement.

On the other hand, in consideration of the above problems of the secondary storage container, it was intended to enhance the cushioning and insulating function without increasing the volume of the secondary storage container. As a solution, in the present invention, a small buffer spring is installed between the secondary storage container and the HTV in the inner wall and the upper end of the secondary storage container. The installation of the spring device also has the advantage of suppressing heat transfer by forming an empty space between the primary storage container and the secondary storage container. In addition, by installing a metallic shock absorbing plate on the bottom surface of the secondary storage container to absorb the impact energy in the fall to absorb the impact energy applied to the container itself.

As described above, the present invention relates to a type B transport container capable of safely transporting a radioactive material, for example, a tritium-filled HTV in the form of metal hydride, and corresponds to a special transport container for external shock and fire accidents. In the present invention, the shock and heat resistance at low or high temperature of the buffer and the heat insulating material in the outer drum of the existing transport container, while reinforcing the heat storage and cushioning function to the secondary storage container is characterized by its features.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration of the present invention.

1 is a cross-sectional view showing the structure of an overall transport container, wherein the transport container according to the present invention is a cylindrical primary hydrogen transport container for storing B-type radioactive material, specifically tritium- occluded metal tritide, that is, HTV (3). Is built in the center, and the secondary storage container (2) of cylindrical shape that serves as a sealing against leakage of HTV surrounds the HTV, and in case of an accident or fire, a shock-absorbing and insulating drum container ( 1) surrounds the secondary storage container (2). Therefore, at the time of conveyance, all three combined containers are mounted on the transport vehicle and connected to the fixed device and transported. The present invention relates to a secondary storage container (2) for the HTV (3) and a drum container (1), the final packaging container, the HTV shown in Figure 1 is applied to the prototype model of the Korea Atomic Energy Research Institute (KAERI) as an example. .

Figure 2 is a cross-sectional view of the transport container according to the present invention, the material of the drum container (1) is preferably 304 stainless steel is used in order not to be easily broken by external impact. Stainless steel is advantageous in weathering test because it doesn't rust on the outer surface even after long time storage. The thickness of the stainless steel drum container 1 is preferably about 1 to 3 mm.

The inner shell of the drum container 1 is to surround the inside of the container with a high temperature heat insulating material 11 made of ceramic fibers. The ceramic insulation 11 surrounds the inner wall of the drum container 1 that receives the most heat during the 800 ° C flame test. Ceramic heat insulating material 11 is used that does not change the heat insulating properties even at temperatures of 1000 ° C. or more. In addition, the ceramic heat insulating material 11 is advantageous in the form of a fiber having flexibility to the external impact. The thickness of the ceramic insulation 11 may vary slightly depending on the size of the drum container (1), it is usually about 10 ~ 50mm. If the ceramic heat insulating material 11 is too thick, the organic foam layer may become thinner and the buffering function may be weakened.

The cross-linked PE foam 12 is installed inside the drum container 1 as a low-temperature heat insulating material and a buffer material after the ceramic heat insulating material 11. The crosslinked PE foam 12 has a higher thermal stability than general PE foam. The crosslinked PE foam 12 is suitable for reducing damage to the inner container by vibration even in a weather resistance test of -40 ° C. The cross-linked PE foam 12 is to use a foam sheet of about 10 ~ 20mm.

The urethane foam 13 finally fills the empty space between the secondary reservoirs 2 in the drum container 1. Although the urethane foam 13 is inferior in thermal stability, it is excellent in buffering and heat insulation characteristics at normal temperature. The urethane foam 13 may be molded from the outside and inserted into the drum container 1 in a modular form, or may be foamed in the drum container 1 through field work.

The secondary storage container 2 is not directly placed on the urethane foam 13, but a round groove is mounted on the crushed support plate 15. Since the lower part of the metallic secondary storage container (2) is rounded, it is possible to distribute the load of the secondary storage container (2) evenly on the bottom of the drum while supporting it, so that the bottom of the drum container (1) is locally deformed by impact. It serves to prevent. The supporting plate 15 is used that is resistant to mechanical impact, such as polypropylene. The thickness of the support plate 15 is not important, but 10 ~ 100mm or so is appropriate.

Since the lower end of the secondary storage container 2 is the site that can receive the strongest impact during the drop test, the shock absorbing layer 100 is placed to absorb the impact energy. The structure of the shock absorbing layer 100 is composed of a hard shock absorbing plate 16, a soft crosslinked PE foam 12, a hard ceramic board 14, and a soft crosslinked PE foam 12. When a strong shock is received, the hard shock absorbing plate 16 and the ceramic board 14 are deformed or damaged to absorb shock energy. On the other hand, the upper end of the drum container (1) also provided a shock absorbing plate (16) on the urethane foam (13) in preparation for the fall of the external heavy material. The shock absorbing plate 16 may be a large plywood or plastic plate having a good impact strength or a composite reinforced with fibers. As the plastic plate, thermoplastic plastics such as polypropylene, polycarbonate, low density polyethylene, and high density polyethylene capable of plastic deformation may be used. If the shock absorbing plate 16 is too thin, the strain energy is low, and if too thick, the deformation energy is transferred to the secondary storage container 2 without being deformed, so it is necessary to pay attention, preferably about 1 to 10 mm. A polycarbonate plate and a ceramic board plate 14 of about 10 to 50 mm are used.

On the other hand, the ceramic film board 14 used in the shock absorbing layer 100 also has the effect of reinforcing the high temperature insulation of the bottom of the drum container (1). Since the lower part of the drum container 1 is pressurized by the inner container, the ceramic heat insulating material 11 made of ceramic fibers installed on the bottom is compressed to reduce the thickness. In this case, the ceramic board 14, which is a high temperature insulating material resistant to compression, serves as a high temperature insulating material to complement the ceramic fiber layer. When the ceramic board 14 is formed on the ceramic fiber using an organic or inorganic binder, high temperature insulation is possible while being resistant to mechanical impact.

3 is a view showing the appearance of the drum container (1), the drum lid 101 during transportation is fastened to the drum body 10 with a locking ring 17 on the rim so as not to open to external impact. And the inner side of the rim of the drum lid 101 in contact with the upper portion of the drum body 10 is surrounded by rubber packing (not shown) for sealing and preventing shock. In addition, an exhaust port 18 is provided in the drum lid 101 so that the internal combustion gas which can be generated during the fire test can escape. The exhaust port 18 is normally sealed with a thermoplastic polymer film to prevent ingress of foreign matter such as moisture or dust, and melted and exhausted when heated. Exhaust port 18 should be a structure that can be discharged only the combustion gas and the external flame does not enter the inside. On the other hand, the hook ring connecting portion 19 is attached to the upper outer wall of the drum container 1 so that the drum container 1 can be lifted using a crane or the like. And the bottom surface of the drum container (1) is installed in the annular bar 20 of about 5 ~ 20mm wide X 5 ~ 20mm in height so that the bottom surface does not directly touch the ground. The annular bar 20 also serves to mitigate the impact of the drop.

4 is a cross-sectional view of the secondary storage container 2 according to the present invention, the secondary storage container 2 is largely a metal upper plate 21, a cylindrical lower metal container 22, and a round dome shaped top cover ( 23). The metal upper plate 21 and the lower metal container 22 are sealed by tightening with a bolt 24 in the form of a flange. On the flange surface where the metal upper plate 21 and the lower metal container 22 contact, a gasket 25 for high temperature and high pressure is installed for strict sealing.

In the center of the upper surface of the metal upper plate 21 of the secondary storage container 2 of the present invention, a gas sampling valve 26 connected to the lower container 22 is attached. The gas sampling valve 26 checks whether the internal primary storage container 3 or HTV leaks radioactive material. In addition, the airtightness of the secondary storage container 2 can be confirmed by pressurizing the secondary storage container 2 through the gas sampling valve 26. Gas sampling valve 26 is used to withstand high temperature and high pressure in preparation for the fire test. A dome top cover 23 is provided to protect the gas sampling valve 26 from external impact. The upper cover 23 also requires airtightness in preparation for leakage of the gas sampling valve 26. The upper cover 23 is in close contact with the metal upper plate 21 by a plurality of bolts 27, and the one or two high-temperature rubber O-rings 28 are sealed therebetween. In addition, in order to check the airtightness of the rubber 0-ring 28, a leak-proof pinhole 29 is provided between the two O-rings 28 through the upper cover 21 to prevent leakage of radioactive material. To measure.

Inside the secondary storage container 2 of the present invention, a plurality of metallic shock absorbers for fixing the primary storage container or the HTV 3 are provided. The inner wall of the secondary storage container 2 is adapted to absorb external vibrations while fixing the primary storage container or the HTV 3 with a half-moon type side spring 30. The side piece spring 30 may also provide an insulation effect by securing an air layer between the primary storage container 3 and the secondary storage container 2. Half moon type spring 30 presented in the present invention is the upper portion is welded to the inner wall of the secondary storage container (2), the lower part is only half contact type inner spring of the secondary storage container (2) when the load is applied to the half moon type spring The lower part slides while the 30 is pressed. The number of half-moon-type springs 30 of the present invention may be fixed to the primary storage container 3. Preferably, 3 to 8 are respectively installed in the upper and lower sides along the inner wall of the secondary storage container (2).

The inner upper surface of the secondary storage container 2, that is, the lower surface of the center of the metal upper plate 21, is connected to and fixed to the fixing bolt 102 in which the one- or cross-shaped metallic leaf spring blade 31 is adjusted in height. It is. Leaf spring blade 31 serves to fix the primary storage container or HTV (3) and to absorb internal vibration. The leaf spring blade 31 is bent while pressing the upper end of the HTV 3. The height of the metal upper plate 21 and the leaf spring blade 31 adjusts the strength of the pressing of the HTV 3 by adjusting the connected bolt 102.

The inner bottom of the secondary storage container 2 also has a metallic shock absorbing plate 32 that can act as a buffer. The edge of the shock absorbing plate 32 is fixed to the inside of the secondary storage container (2) by welding. Although the shock absorbing plate 32 normally supports the primary storage container 3 as a rigid body, strong impact energy is applied between the secondary storage container 2 and the primary storage container 3 as in the case of the 9m drop test. When delivered, it deforms while absorbing energy, and serves to reduce the energy delivered to the primary storage container (3). Preferably, the shock absorbing plate 32 has a circular disk shape and has three to four holes symmetrically circumferentially circumferentially, so that the shock absorbing plate 32 has a structure that is easily deformed by impact, and a strong and ductile material such as stainless steel is used. . Since the shock absorbing plate 32 is too thick, it does not deform and transfers the impact energy to the primary storage container 3 as it is, so attention is required. Therefore, it is preferable that the thickness is thinner than the inner wall of the secondary storage container (2). On the other hand, due to the shock absorbing plate 32 to form an empty space between the bottom of the primary storage container 3 and the secondary storage container (2) to have a heat insulating effect at the same time.

(Production example)

1. Production of HTV

The HTV used for the container used an HTV test container manufactured by the Korea Atomic Energy Research Institute (see FIG. 5). The appearance of HTV is 670mm in total height and 165mm in outer diameter and is made of SUS 316L.

2. Manufacture of secondary storage containers

Based on the HTV, a secondary storage container (see FIG. 6) was manufactured using STS 304. The main specifications are as follows. The lower container uses a stainless steel pipe for pipes (KS D3576 2OOA × Sch 2OS, OD; 216.3 T; 6.5 ID 203.3) and the lower side with a round cap (KS B 1541 2OOA × Sch 20, OD; 216.3 E; 101.6) Welded by welding type and prevented. The top of the vessel is welded to the stainless steel welded flange (KS B 1506 2OK insert welded flange hub flange (SOH) Type C 200) and the corresponding plugged flange (stainless steel welded flange; KS B 1506 2OK plugged flange ( BL) 2OO) to block the top. There are 12 bolts connecting the flange, and the size of KS nominal M22 is used STS304 of the same material. The gasket seat on the flange was the grooved gasket shown in KS B 1519. The gasket is made of Teflon material. Sampling valves installed on clogged flanges Male NPT 1/4 size was used as Bleed Va | ve (SS-BVM2-SH-C3). The top cover to protect the sampling valve has a round cap (KS B 1541 8OA × Sch 1O, OD; 89.1 E; 50.8) and a stainless steel welded flange (KS B 1506 1OK 80, insert welded flange plate flange (SOP)). It was constructed by welding. The top cover was secured with flange fastening bolts to the vessel top plate described above. Tightening bolt size was used as six KS M16 size. Two O-rings were used between the top cover and the container top flange, based on KS B 2799 G100 and G115. The material of the O-ring used was a high temperature rubber. The leaf spring installed above the inside of the container has a length; 178 mm, plate thickness; 2 mm, plate width; It was set as 30 mm. The leaf spring was welded to the center of the M12 bolt, and then screwed into the bolt hole of the upper plate. Half moon springs of the inner wall of the container are piece lengths; 7Omm piece thickness; 1 mm, piece width; A total of eight welded pieces were attached at the top and bottom of 10 mm, respectively. The bottom surface of the container is a diameter of the shock absorbing plate for holding the HTV; 13Omm, thickness; A 3mm stainless steel round plate was used, and the round plate edge was fixed by welding with the container. The circular plate has four holes with a diameter of 31 mm in the periphery.

3. Drum container production

Based on the secondary container, a transport drum (see FIG. 7), which is a final transport container, was manufactured using STS 304. The main specifications are as follows. The conveying drum was produced with an inner diameter of 57 mm, an inner height of 98 mm, and a thickness of 2 mm. And the lid thickness was about 1.5 mm. The drum lid was tightened to close the drum body using a lock ring. The locking ring is clamped on the inside of the top of the drum. A rubber gasket of width 1mm x height 5mm was attached to the bottom surface of the drum lid in contact with the drum body. The exhaust port was installed by making a 30 mm hole in the upper surface of the lid and welding a 5 mm long clogging tube, and then drilling five 5 mm diameter holes in the top of the clogging tube. An edge of the outer bottom of the drum was welded with an annular bar measuring 10 × 10 mm, leaving a space between the bottom of the drum and the ground. Then, in order to protect the annular bar, a STS 304 metal piece having a thickness of 2 mm and a height of 50 mm was welded and added around the bottom end of the outer surface of the container. In order to fix and lift the drum container, four hook rings 6mm thick, 8mm long and 5mm wide were installed on the top side of the drum, and hooks of 15mm diameter were drilled in the hook ring to allow hooks from outside.

4. Installation of insulation and cushioning material

Insulation and a cushioning material were installed in the empty space between the said conveying drum container and a secondary container. First, ceramic fiber (Garam Co., Ltd., Kaowoo | Blanket 126OC) having a thickness of 25 mm and a diameter of 570 mm was placed on the bottom surface of the drum container. On the inner wall of the drum container, a ceramic fiber (Garam Co., Ltd., Kaowoo | Blanket 1260C) having a thickness of 25 mm was installed. On the ceramic fiber layer provided on the inner wall, a cross-linked PE foam sheet (Unification Industry Co., Ltd.) having a thickness of 20 mm was installed. A crosslinked PE foam sheet (Unification Industry Co., Ltd.) having a thickness of 20 mm and a diameter of 48 mm was also laid on the inner bottom. As one side of the crosslinked PE foam, a flame-treated silver foil was used. The ceramic board (Cera Board, Garam Co., Ltd.) of thickness 25mm and diameter 48Omm was laid on the crosslinked PE foam sheet of the bottom of a container. After the ceramic board was installed, a buffered crosslinked PE foam with a thickness of 20 mm and a diameter of 48 mm was laid. On the cross-linked PE foam, a polycarbonate plate for impact absorption of 5 mm in thickness and 48 mm in diameter was installed. On the polycarbonate plate, a square base plate of polypropylene thickness of 35 mm and a width of 35 mm was placed. The square base plate was used to be grooved to raise the round bottom of the secondary storage container with a depth of 35mm in the center. After placing the primary storage container or the secondary storage container with HTV on the backing plate, the foam was filled with urethane foam (Nambang Chemica | s Co. Ltd) up to 30 mm below the top of the drum container. The urethane foaming agent was foamed in situ as an A / B two-component type with a mixing ratio of 1: 1. The urethane foam-filled drum container was equipped with a 25 mm ceramic fiber, a 5 mm thick, 48 mm diameter polycarbonate plate for shock absorption, and closed with a drum lid.

5. Drop test

After filling the HeTV of about 1.5 atm inside the HTV of FIG. 5, the secondary storage container and the transport drum container were sequentially segregated. The steel wire connected to the large drop tower was connected to the hook hooks installed on the top four transport drum containers, and dropped freely at a height of 9 m. Free-falling drum container was again dropped on the 1m immersion (bong needle diameter 15cm, height 20cm). After the drop test, the drum container showed a slight deformation at the lower end of the drum and a few scratches on the bottom surface of the drum due to the needle needle, but there was no abnormality (see FIG. 8B).

The thermal insulation and cushioning material in the drum container after the drop test were disassembled and the insulation and the cushioning material at the bottom of the drum container which were the strongest impact were examined. The polypropylene backing plate installed under the secondary storage vessel was not damaged at all (see FIG. 9). The polycarbonate sheet for shock absorption was broken by the impact (see Fig. 9). A slight tear was observed in the crosslinked PE foam under the impact-absorbing polycarbonate plate. In the ceramic board, the area corresponding to the polypropylene support plate was pressed, and the ceramic fiber bond was weakened in the pressed area, thereby losing its rigidity. However, no significant cracks were seen in the ceramic board (see FIG. 10). The cross-linked PE foam installed at the bottom bottom showed no abnormality at all.

The characteristics of the radioactive material suit and the container according to the present invention discussed above can be summarized as follows.

First, the protective layer for buffering and insulating in the drum container is composed of a triple layer of ceramic fiber layer, cross-linked PE foam layer, urethane foam layer according to the thermal properties to make a good buffering and insulating at low and high temperatures. Then, the shock absorbing layer was configured to absorb the impact energy at the time of falling to the bottom of the drum container. In addition, a shock absorbing plate was installed at the top of the container in preparation for the fall of the external heavy material. Through this configuration has the advantage of further improving the buffering and insulating effect of the drum container.

Second, a spring was installed on the inner wall to allow for shock absorbing in the secondary storage container. In addition, the shock absorbing plate of the metal song was installed at the bottom of the secondary storage container to absorb the impact energy during the fall. These internal devices also have the advantage of enhancing the thermal insulation properties by forming an empty space between the primary storage container or the HTV and the secondary storage container.

1 is a cross-sectional view showing the structure of an overall transport container,

2 is a cross-sectional view of the drum container according to the present invention,

3 is a view showing the appearance of the drum container,

4 is a cross-sectional view of the secondary storage container according to the present invention,

5 is a view showing an actual production example of the HTV,

6 is a view showing an actual production example of a secondary storage container,

7 is a view showing an actual production example of a drum container,

8a and 8b is a view showing the storage container and the dropped storage container installed in the crane for the 9m free fall test,

9 is a view showing a broken state of the polycarbonate shock absorbing plate installed in the lower drum container,

10 is a view showing a damaged state of the ceramic fiber board plate installed in the lower drum container,

11 is a view showing a modified view of the stainless steel shock absorbing plate installed in the lower secondary storage container.

Claims (13)

Primary storage container for storing radioactive material such as tritium in the form of metal hydride, secondary storage container which encloses the primary storage container in preparation for leakage of the primary storage container, and for external shock and fire And a drum container including a drum body and a drum lid surrounding the secondary storage container, wherein the secondary storage container and the drum container are provided with a radioactive material storage and transport container with a ceramic insulation and polyurethane foam interposed therebetween. , A radioactive material storage and transport container, characterized in that a layer of crosslinked polyethylene foam is formed between the ceramic insulation and polyurethane foam placed sequentially from the drum container side. The method of claim 1, A radioactive material storage and transport container, characterized in that the shock absorbing layer comprising the cross-linked polyethylene foam sequentially and the stress distribution support for supporting the secondary storage container from the lower surface side of the drum container. The method of claim 1, The ceramic insulation is provided throughout the inside of the drum container, the crosslinked polyethylene foam is provided on the inner wall and the lower surface side of the drum container, A radioactive material storage and transport container, characterized in that the shock absorbing layer comprising the cross-linked polyethylene foam sequentially and the stress distribution support for supporting the secondary storage container from the lower surface side of the drum container. The method of claim 3, wherein The shock absorbing layer is a radioactive material storage and transport container, characterized in that consisting of the cross-linked polyethylene foam, ceramic board board, cross-linked polyethylene foam, and the shock absorbing plate in the order from the lower surface side of the drum container. The method of claim 4, wherein The drum container is a radioactive material storage and transport container, characterized in that further comprising a shock absorbing plate on top of the ceramic insulating material provided on the upper side. The method according to any one of claims 1 to 5, The secondary storage container is a cylindrical metal container having a round cap shape at the lower end thereof, and is hermetically coupled to the metal container, and has a gas sampling valve for checking the leakage of radioactive material in the primary storage container and an upper cover protecting the gas sampling valve. A radioactive material storage and transport container, characterized in that consisting of a metal plate. The method of claim 1, And the secondary storage container supports the primary storage container, and has a shock absorbing plate capable of plastic deformation when an impact is applied to the lower portion of the inner space. The method of claim 6, The secondary storage container is a radioactive material storage and transport container, characterized in that for fixing the primary storage container and having a plurality of springs on its inner wall surface to absorb vibration. The method of claim 6, The secondary storage container is a radioactive material storage and transport container, characterized in that the buffer spring is provided on the lower portion of the metal upper plate to secure the empty space on the upper portion of the secondary storage container while fixing the primary storage container. The method of claim 8, Each of the plurality of springs is a half-moon type spring, and only one side is fixed to the secondary storage container radioactive material storage and transport container. The method of claim 9, The shock absorbing spring is a leaf spring, which is fixed to the upper storage container by abutting the upper portion of the primary storage container, absorbs internal vibrations, and is provided on the lower surface of the metal plate through screws to adjust the height. Containers for the storage and transport of radioactive material. The method according to claim 4 or 5, The shock absorbing plate is a plastic material capable of plastic deformation, the radioactive material storage and transport container, characterized in that the thermoplastic plastic, such as polypropylene, low density polyethylene, high density polyethylene. The method of claim 7, wherein The shock absorbing plate is made of the same material as the secondary storage container, welded to the inner wall of the secondary storage container, the radioactive material storage and transport container, characterized in that less than the secondary storage container.