KR100967391B1 - Dedicated transferring container for receiving and transferring radioactive waste HIC - Google Patents

Abstract

The present invention relates to a radioactive waste transport container, and specifically includes a dedicated transport container for transporting a radioactive waste storage container, such as a high-integrity container (HIC), or a shock absorbing device coupled to upper and lower portions of a transport container to mitigate an impact. It relates to a dedicated transport container. The dedicated transport container includes a container body; A lid coupled to the top of the container body; A plurality of securing devices protruding from the outer surface of the container body; And a lifting engagement device formed on the outer surface of the container body, wherein the lid comprises a circular flange and an o-ring formed on the lower face of the flange.

 Radioactive waste containers, shock absorbers, gas inlets, detection holes, high soundness containers, lifting straps, trunnion

Description

Dedicated transferring container for receiving and transferring radioactive waste HIC

The present invention relates to a radioactive waste transport container, and more particularly, to a dedicated transport container including a high transport container (HIC) or a transport container including a shock absorbing device coupled to upper and lower parts of the transport container to mitigate impact. will be.

To transport radioactive waste to a disposal facility, the radioactive waste must be loaded and transported in a transport container that meets legal standards to protect against radiation exposure to the carrier and to minimize nuclide leakage into the ecosystem against fictitious transport accidents. Doing.

The radioactive waste transport container shall be designed and manufactured to satisfy the transport regulations and technical level prescribed by the National Atomic Energy Act, the Enforcement Decree, and the Enforcement Regulations for the safety of workers and the public. Transport containers should be used after safety has been proved by various tests.

A prior art related to a radioactive waste container is Patent Application No. 10-1990-0004338, "Storage Module of Nuclear Waste Package and Its Manufacturing Method". Prior application inventions propose concrete storage modules for storing and receiving nuclear waste at various radiation levels in order to be stored at the disposal site of the waste and safely handled by the operator. The storage module includes a container having a sidewall, a bottom and an interior space and made of a moldable material for storing a nuclear waste package therein. And the storage module is formed integrally with the liner to extend along the outside of the wall of the liner and to be embedded within the sidewall of the liner, with a seamless liner having walls and bottoms lying on the interior surface of the bottom and bottom of the container in the same shape as the interior space. Has a rib of.

Prior art related to containers for waste resin conveyance is patent application No. 10-1998-0705974 "containers for transporting, storing and containing fuel assemblies". The invention proposes a transport container and a cask for storing and transporting used nuclear waste. The transport container consists of a plurality of independent sleeves arranged in uniform form and fixed inside the cylindrical shell. The shipping container also includes a plate of neutron absorbing material located on the inner sidewalls of each of the plurality of sleeves to maintain a cleavage reaction in the container below the required reference level. The prior art all propose containers related to the storage and transport of nuclear waste, but patent application No. 10-1990-0004338 relates to a storage module for storage and does not disclose a transport container. Patent Application No. 10-1998-0705974 proposes a transport container but has a disadvantage that the proposed container is not suitable for being used as a transport container for transporting a storage container such as an HIC container.

As such, the prior invention relates to a storage module or a container, and does not disclose a container for the purpose of receiving and transporting a transport container. Radioactive waste is stored and stored in certain storage containers after it is generated. In addition, if it is necessary to transport radioactive waste from the storage site to the treatment plant, a transport container for accommodating the storage container is required. The present invention proposes a dedicated container for receiving and transporting the storage container as described above.

An object of the present invention is to combine the upper and lower portions of a dedicated transport container and the container to accommodate the storage container, such as a high-healthy container (HIC) having a radiation shielding effect and robustness suitable for transporting the shock to alleviate the impact It is to provide a dedicated transport container containing the device.

According to a preferred embodiment of the present invention, a radioactive waste transport container includes a container body; A lid coupled to the top of the container body; A plurality of securing devices protruding from the outer surface of the container body; And a lifting engagement device fastened to the outer surface of the container body, wherein the lid comprises a circular flange and an o-ring is formed on the lower face of the flange.

According to another suitable embodiment of the present invention, a gas inlet and a detection hole for checking whether the container body is sealed are formed in the lid.

According to another feature of the invention, the transport container further comprises a shock absorber coupled to the lid and the bottom of the container body.

The waste transport container according to the present invention for transporting a waste storage container such as a high integrity container (HIC) exclusively has a high radiation shielding effect and a high sealing property, which may be usefully applied to the storage and transport of the storage container. In addition, when a safety accident occurs, the impact buffer device coupled to the upper and lower parts of the transport container has an advantage of preventing damage to the waste storage container and the contents due to the impact.

The invention is described in detail below with reference to the accompanying drawings and by way of example. The examples presented are for clarity of understanding and it is obvious that the invention is not limited to the scope of the examples.

The radioactive waste transport container according to the present invention is a dedicated transport for storing and transporting high-concentration containers (HIC) or other low and medium-level radioactive waste storage containers with high intensity of radiation generated from a nuclear power plant or waste resin. Can be used as a container. Most radioactive waste from nuclear power plants is stored and stored in drum-type storage containers. The transport container should have a suitable shape to accommodate such a storage container and may have a cylindrical shape, for example. For transport to a disposal site or other storage location, the dedicated transport container must have a container handling means to facilitate loading and unloading of the transport container to a transport means, for example a transport vehicle. And in order to protect the dedicated container or storage container from the impact that may occur during the transport process, the dedicated transport container must have a fixing means capable of firmly fixing the dedicated container or the storage container. In addition, the dedicated transport container should have a structure that can minimize the exposure of workers during handling of the transport container in consideration of the radiological safety.

Dedicated transport containers according to the invention should basically have safety against radioactive coatings.

For example, the body and lid of a transport container are optimally suited to the criteria established through radiation shielding and structural analysis, based on the case where a high integrity container (HIC container) containing a concentrated waste liquid with the highest dose is contained in the container. It can be determined by the thickness of. As a reference, looking at the technical criteria for the analysis of radiation shielding according to the Ministry of Science and Technology, the radiation dose rate at the outer surface of the packaging should not exceed 10 mSv / h when the maximum quantity that can be transported is contained. It should also not exceed 2 mSv / h at the surface of the vehicle, 0.1 mSv / h at 2 meters from the surface of the vehicle and 0.02 mSv / h at the driver's seat when loaded on a transport vehicle. Structural design shall be assessed for structural integrity in accordance with normal transport and transport accident conditions specified in IAEA Safety Standard Series NO.TS-R-1, Transitional Notice No. 2001-23 and US 10 CFR Part 71. Above all, the containment boundary of the packaging shall be designed on the basis of the concept of radiological shielding of the contents and the prevention of contents leakage to ensure structural integrity in all possible cases. The transport container corresponds to a pressure vessel that causes internal pressure in an internal space forming a containment boundary. The structural integrity of the transport container shall be assessed by classifying the stresses calculated for each condition into the corresponding stress intensities such as primary film stress, primary bending stress and secondary stress and comparing with the stress limits for normal transport and transport accident conditions. Lifting devices and binding devices for transport vessels are to be interpreted as general criteria and their integrity can be assessed in comparison with the yield strength for each corresponding load. The load on the container can be divided into internal pressure, thermal load due to temperature gradient in case of fire, and impact load due to free fall and rupture conditions. These loading conditions are used to calculate the stresses that occur in each part of the packaging by overlapping initial loads such as atmospheric, solar and internally generated thermal conditions.

The transport container according to the present invention should have storage container acceptability, radiation stability and ease of handling as described above. Transport containers with such conditions are described in detail below.

1 shows an embodiment of a transport container 10 for transporting radioactive waste in accordance with the present invention.

Referring to FIG. 1, the transport container 10 according to the present invention includes a main body 11 for receiving a storage container such as, for example, a high-health container and an openable lid 12 for blocking the outside and the inside. do. In addition, shock absorbers 13 and 14 may be installed on the upper and lower portions of the transport container 10.

In the upper part of the main body 11, a plurality of coupling holes 111 are formed to fix the lid 12, and a plurality of securing devices 112 and a plurality of lifting binding devices 113 are formed in the wall of the main body 11; do.

The securing device 112 is for fixing the carrying container 10 to a conveying means such as a vehicle, for example, and has a structure that can be coupled to a thin wire such as a chain or a wire. The lifting binding device 113 has a structure capable of fixing the transport container 10 to a lifting device (not shown). And shock absorbers 13 and 14 are installed to protect the transport container 10 from shocks that may occur during transport.

The lid 12 includes a plurality of corresponding engagement holes 121 for engagement with the body 11. The coupling holes 111 formed in the main body 11 and the corresponding coupling holes 121 formed in the lid 12 are engaged by fixing means such as bolts, for example, to seal the inside of the transport container 10 from the outside. If necessary, a sealing means such as a packing may be installed in the lid 12, and a sealing packing may be installed in each coupling means (not shown) for engaging the coupling hole 111 and the corresponding coupling hole 121. have.

The shock absorbers 13 and 14 coupled to the upper and lower portions of the transport container 10 may have a cylindrical shape in which one side of the transport container 10 may receive a lower portion of the transport container 10. The transport container 10 housed in the shock absorbers 13 and 14 can be firmly coupled by means of fastening, such as bolts. To this end, an appropriate number of binding holes (not shown) are formed in the shock absorbers 13 and 14, and corresponding coupling holes (not shown) are provided in the lower part of the corresponding lid 12 and the transport container 10. Can be formed.

The transport container 10 and the lid 12 should be made of a material that has resistance to shocks that may occur during the transport process and at the same time shields radiation from the storage container housed inside the transport container 10. . For example, the transport container 10 and the lid 12 may be made of carbon steel or special steel including manganese (Mn), chromium (Cr), nobelium (No), and tungsten (W).

The thickness of the main body 11 and the lid 12 may vary depending on the type of storage container accommodated therein. When the shielding analysis and the structural analysis are applied to satisfy the allowable radiation dose rate condition and the expected impact resistance described above, the thickness of the main body 11 may be 180 mm to 260 mm and preferably 210 to 230 mm. Although it may be designed differently according to the specification of the storage container, in general, if the inner diameter of the main body of the transport container 10 is 1000mm to 1500mm, the outer diameter will be 1180mm to 2020mm when applying the above-described thickness. The height of the body can be determined according to the height of the storage container and can generally be 1300 mm to 2000 mm. If the HIC container is accommodated, the transport container 10 may have the following specifications.

Body inner diameter of the storage container 10: 1340 mm

Body outer diameter of the storage container 10: 1780 mm

Thickness of the storage container 10: 220 mm

Height of storage container 10: 1670 mm

The lid 12 may be coupled to the body 11 in a form inserted from above. As described above for protection from shock or vibration, the lid 12 has a corresponding engagement hole 121 which can accommodate a fixing means such as a bolt together with the engagement hole 111 of the body 11. The lid 12 is coupled to the container body 10 by an insert engaging portion 122 having a diameter corresponding to the inner diameter of the container body 10. And the flange 123 is formed along the circumference of the insertion coupling portion 122 and the corresponding coupling hole 121 is formed to correspond to the coupling hole 111 of the container body 10 along the circumferential surface of the flange 123. Can be. The protruding height of the insert engagement portion 122 can be any height but can be 0.5 to 2 times the thickness of the container for ease of engagement and separation. And the flange 123 may extend larger than the outer diameter of the main body 11, but may preferably extend to the outer diameter of the container for convenience of handling. Therefore, the lid 12 has a cylindrical shape as a whole with the main body 11.

Hereinafter, each component will be described in detail.

2A, 2B, 2C and 2D show a plan view, a first cross section, a second cross section and a third cross section of the main body 11, respectively. The first, second and third cross-sectional views show cross-sectional views cut along different directions, respectively.

2A, 2B and 2C, the main body 11 includes a plurality of engaging holes 111 formed at regular intervals along the upper thickness plane, and a plurality of securing devices 112 formed at regular intervals from an outer surface of the main body 11. ) And a lifting binding device 113 formed at regular intervals on the outside of the main body 11. The number of the coupling holes 111 or the spacing between the coupling holes 111 may be arbitrarily determined but may be 8 to 30. The engagement hole 111 and the fastening means can be made according to methods known in the art. As shown in FIG. 2B, the securing device 112 must have a structure that protrudes in a constant shape from the outer surface of the main body 11 and can accommodate a strapping means such as, for example, a wire line. For example, the securing device 112 may have a through hole 112a through which the binding means may pass and may further include a locking device (not shown) that secures the binding means to the through hole. As shown in FIG. 2B, a plurality of securing devices 112 may be formed on the outer surface of the body 11 at regular intervals at the same or different heights. The location and number of formations of the securing device 112 can be selected by any method available to one of ordinary skill in the art, but preferably such as top and bottom along the body 11 height as shown in FIG. 2B. Two can be installed in each of two locations. However, it is obvious that the present invention is not limited by these embodiments.

Unlike the fastening device 112, as shown in FIG. 2C, the lifting tune 113 may be fastened by several bolts to the surface of the main body 11. A lifting tune 113 can be used to load or unload a transport container to a transport means such as a vehicle, for example. For example, the transport container lifting device may be bound to a lifting junction outside the transport container to fix the transport container and load it on a vehicle. A lifting device can be coupled to a lifting binding 113 to secure the transport container to be movable by the lifting device. In FIG. 2C, the lifting engagement 113 is illustrated with a projection and several binding bolts 113a, but may be made in the form of several projections and fixtures as needed. The lifting engagement 113 can be made corresponding to the lifting device used but preferably two to five on the outer surface of the body 11 are formed in such a way that they can be balanced during the movement of the transport vessel. Can be.

If the lifting device is loaded or unloaded with a lifting container 113, for example made of carbon steel (SA182-F304) of 147 mm thickness and 170 mm diameter, the lifting bundle ( 113 may be fixed to the outside of the main body 11 by a plurality of bolts.

For lifting of the container, two lifting two sides 113 may be fastened to the outer side of the container. In one embodiment, the lifting binding device (trunnion) 113 may be formed of a carbon steel (SA182-F304) material of a thickness 147mm, diameter 170mm. A bolting is used to attach the lifting junction 113 to the side of the body of the container, the number of bolts can be two or more, preferably 16 bolts can be used.

2D illustrates the lower fixing hole 114 formed below the main body 11. The lower fixing hole 114 may be formed to fix the shock absorber described below to the main body 11. The lower fixing hole 114 can be any number but preferably six and the shock absorber can be fixed to the lower part of the body 11 by fixing means such as bolts.

Figures 3a, 3b, 3c and 3d show a plan view, a first cross section, a second cross section and a third cross section, respectively, of a lid of a transport container according to the invention. The first cross-sectional view is taken along the line A-A of FIG. 3A, the second cross-sectional view is taken along the line B-B of FIG. 3A, and the third cross-sectional view is taken along the line C-C of FIG. 3A.

Referring to FIG. 3A, the lid includes a corresponding coupling hole 31 corresponding to the coupling hole formed in the main body, a fixing hole 33 for fixing the shock buffer device described below to the lid, and a fixing container for fixing the lifting container to the lifting device. It may include a lifting coupling hole 34. Corresponding engagement holes 31 and fixing holes 33 are formed in the flange 123 along the circumference of the lid and the lifting engagement holes 34 can be formed in the central portion of the lid as shown in FIGS. 3B and 3C. have. The corresponding engagement hole 31 is formed through the flange 123. In contrast, the fixing hole 33 and the lifting coupling hole 34 may be formed in the center portion of the circumference of the flange 123 and the upper surface of the lid in the form of a groove having an appropriate depth, respectively. The lid shall be able to completely seal the inside of the body from the outside. For example, the M30 size bolt made of carbon steel may be fastened to the corresponding coupling hole 31 and the coupling hole (see FIG. 1) to couple the lid to the main body. In this case, an O-ring may be mounted along the circumference of the lower surface of the flange 123 on which the corresponding engagement hole 31 is formed to improve the sealing performance of the lid. The O-ring may be formed in one step to three steps with an elastic material such as silicone rubber, and preferably may be formed in two steps. The O-ring may be of a type known in the art and the thickness may be appropriately selected but preferably 8 to 20 mm.

3A, a detection hole 32 is formed inside the circumferential surface on which the corresponding engagement hole 31 and the fixing hole 33 are formed. FIG. 3D shows the gas inlet 35 and detection hole 32 and FIG. 3E shows a detailed view of the detection hole 32.

The detection hole 32 is formed in the flange 123 and the gas injection hole 35 is formed in a portion corresponding to the inside of the main body. For example, a detection gas such as helium (He) gas is injected through the gas inlet 35, and the injected detection gas can be detected in the detection hole 32 depending on the sealing state. If the seal is incomplete, the detection gas injected from the nipple 322 formed in the detection hole 32 will be detected. On the other hand, if the detection gas is not detected in the nipple 322, it is determined that it is sufficiently sealed. When the sealing is completed, the nipple 322 is closed by the cap 321. The detection hole 32 may be installed at any position of the flange 123 but is preferably formed between the O-rings 36. 3E shows a two stage O-ring 36 along the periphery of the lower portion of the flange 123 and a detection hole 32 formed between the two stage O-rings. The gas inlet 35 may be made in any form capable of injecting the detection gas into the body and may be sealed by appropriate sealing means upon completion of the sealing inspection process.

Shock absorbers may be installed at the bottom and the lid of the transport container, respectively.

Figure 4 shows a cross-sectional view of one embodiment of the shock absorber.

The shock absorber 13 has a cylindrical shape with one side open, a plurality of engaging holes 41, an extension portion 42 surrounding a part of the main body of the carrying container, a stainless steel plate 43 in contact with a lid or a lower part of the main body, and The shock absorbing plate 44 is sequentially stacked from the steel plate 43 in a multilayer form. The extension portion 42 and the shock absorbing plate 44 may be made of wood for shock absorption, and in particular, the shock absorbing plate 44 may be formed of a multilayer of high shock absorbing wood such as spurs wood. And the extension portion 42 can be made of beech wood. The steel plate 43 is provided so that the impact is evenly distributed on the upper or lower body. The thickness of the steel plate 43 and the shock absorbing plate 44 may be appropriately selected, but the steel plate 43 may be 30 to 60 mm. The extension portion 42 may be appropriately selected in view of the overall height of the container body and may preferably have an extension height of 1/5 to 1/10 of the overall height. The engagement holes 41 may be formed in any suitable number to correspond to the fixing holes formed in the lid or the bottom surface along the circumferential surface. By fastening the fixing means such as a bolt to the fixing hole 41, the shock absorber 13 can be fixed to the lid or bottom surface of the transport container. 4 shows the shock absorber 13 coupled to the lid, but the shock absorber coupled to the bottom of the body can also be made in the same way.

The present invention has been described above in detail by using an embodiment. The presented embodiments are illustrative and can be made by those skilled in the art to various modifications and modifications to the disclosed embodiments without departing from the spirit of the invention. The scope of the invention is not limited by these variations and modifications, but only by the claims appended below.

1 shows an embodiment of a transport container 10 for transporting radioactive waste in accordance with the present invention.

2A, 2B, 2C and 2D show a plan view, a first cross section, a second cross section and a third cross section of the main body 11, respectively.

Figures 3a, 3b, 3c and 3d show a plan view, a first cross section, a second cross section and a third cross section, respectively, of a lid of a transport container according to the invention.

Figure 4 shows a cross-sectional view of one embodiment of the shock absorber.

Claims (3)

In the radioactive waste container, Container body; A gas inlet and a detection hole for checking whether the container body is sealed, and a lid coupled to an upper portion of the container body; A plurality of securing devices protruding from the outer surface of the container body; And A lifting binding device fastened to an outer surface of the container body, Wherein the lid comprises a circular flange and an O-ring is formed on the lower surface of the flange. The transport container for a radioactive waste according to claim 1, wherein a gas injection hole and a detection hole for checking whether the container body is sealed are formed in the lid. delete

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