KR101057403B1 - Radioactive waste storage drum - Google Patents

Abstract

The present invention relates to a radioactive waste storage drum for storing radioactive waste generated in a nuclear power plant or the like, in particular, waste resin,

A cylindrical body 11 in which radioactive waste is stored therein; A lower plate 12 attached to a position spaced upward from the lower end of the body 11 by a predetermined degree; An upper plate 13 installed at an upper end of the body 11 and having an insertion hole 13 'formed at the center thereof; An injection tube 14 attached to the upper plate 13 to be connected to the insertion hole 13 '; A flange 15 attached to an upper end of the injection tube 14 and having a groove 15 ′ inserted into the ring 16 for packing; A lid 17 covering an upper surface of the flange 15; And a pair of clamping members 18 coupled and sealed by the fastening member in a state in which the edges of the flange 15 and the lid 17 are wrapped.

The radioactive waste storage drum of the present invention satisfies both domestic and international radioactive waste storage container manufacturing standards such as impact resistance, pressure resistance, and compression resistance to safely store radioactive waste.

Nuclear power, power plant, waste, drum

Description

Radioactive Waste Storage Drum {Strorage Drum for Radioactive Waste}

The present invention relates to a radioactive waste storage drum for storing radioactive wastes, particularly waste resins, generated in a nuclear power plant, etc., in particular, which can satisfy both impact resistance, pressure resistance, and compression resistance required by standards for radioactive waste storage containers at home and abroad. A radioactive waste storage drum.

In general, radioactive waste is an unnecessary radioactive material generated in the process of using nuclear energy in a nuclear power plant and the like, and wastes, nuclear fission products, cooling water, cooling gas, etc., generated from a nuclear power plant or a workshop or laboratory dealing with radioactive materials. Leaks;

 In the disposal and disposal of such radioactive waste, it is legally stipulated that the effect on the surrounding natural radioactivity by it should be less than 1/10 of the maximum allowable dose.

The treatment of radioactive waste differs depending on the condition of the waste, which is explained as follows.

First, the gaseous waste is stored in an airtight tank, and when the radioactivity falls below the reference value, the gaseous waste is filtered through a high performance filter (HEPA filter) and discharged to the atmosphere. At this time, after confirming that the concentration of radioactive material in the air is 1/10 or less of the maximum allowable concentration, a method of discharging from the exhaust facility is used. Filtration removes more than 99.99% of gaseous waste, and the filter used for filtration is treated as a solid waste at the end of its life.

In addition, liquid waste is collected in a storage tank at a weight concentration of ppb (1 billion or less) and recycled to clean water using an evaporator. The waste is made into a stable solid and sealed by storing it in an iron drum. At this time, the wastewater with low radioactivity and low miscellaneous salt may be filtered and released after diluting with a large amount of mixed wastewater.

Finally, solid waste can be divided into incombustibles and combustibles. The combustibles are incinerated and then made into ash, solidified in concrete, and then stored in drums with incombustibles. Combustibles are compressed or solidified with a hardener and placed in an iron drum and stored in a sealed power plant or storage.

With the recent increase in the use of nuclear power, the problem of disposal of wastes generated from nuclear power plants has emerged as an important task.

The radioactive waste treatment methods include a full-layer disposal method of digging shallow soil and stacking waste drums, and a deep disposal method of stacking waste drums by digging caves deep in the ground or in the mountains or under the sea.

Such a radioactive waste treatment plant should be constructed in a hard rock or geologically stable area without the risk of earthquakes, no ground subsidence, and no groundwater flow. It should also be avoided in densely populated areas or areas where resources can be developed, and where there are many substances that can conduct heat well from waste.

Since the radioactive waste is stored in an iron drum or the like, the storage container in which the radioactive waste is stored is prescribed to satisfy specific conditions. That is, the contents of the container should be 1400L or more and there should be no deformation of the container even when lifting three times the contents.

In addition, there should be no deformation even in the load of 10 Ton, and it should be a remote control type structure that fastening, handling and movement can be operated by automated equipment. In addition, the deformation of the appearance should be minimized at the time of disposal, and the upper lid should be kept airtight after the contents are injected.

However, there is a problem that the general iron drum currently in use is susceptible to external shock and difficult to meet the above strict conditions. In particular, it is pointed out that the strength of the upper portion and the lower portion of the body is weak.

In order to solve this problem, the thickness of the iron drum may be increased, but in this case, the manufacturing cost of the drum increases and the weight of the drum increases, making the drum transport and storage inconvenient.

In addition, it is desirable to store as much radioactive waste as possible in the drum, but there is a problem that the storage amount is limited.

In addition, it is pointed out that the steel drum currently in use has a weak airtightness between the flange and the lid.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to provide a radioactive waste storage drum that can satisfy the strict specifications of domestic and international regulations, such as impact resistance and pressure resistance and compression resistance required for radioactive waste storage have.

In addition, the present invention is to remove the air present in the gap between the radioactive waste during the storage of radioactive waste, in particular waste resin, so that the resin polymer can be injected into the radioactive waste quickly to minimize the gap between the radioactive waste and increase the storage amount The purpose is to provide a radioactive waste storage drum.

In addition, an object of the present invention is to provide a radioactive waste storage drum with enhanced strength of the upper and lower portions of the body that are easily deformed by external impact.

In addition, an object of the present invention is to provide a radioactive waste storage drum which reinforces the strength of the injection tube protruding to the upper side of the top plate so that the injection tube is not deformed or damaged by external force.

It is also an object of the present invention to provide a radioactive waste storage drum capable of reducing the weight of the lid covering the top of the flange.

Another object of the present invention is to provide a radioactive waste storage drum having a clamping member capable of minimizing its thickness while strongly sealing the flange and the lid.

The present invention for achieving the above object is a cylindrical body in which radioactive waste is stored; A lower plate attached to a position spaced upward from the lower end of the body to some extent; An upper plate installed at an upper end of the body and having an insertion hole formed at a center thereof; An injection tube attached to the upper plate to extend into the insertion hole; A flange attached to an upper end of the injection tube and having a groove into which a ring for packing is inserted; A lid covering an upper surface of the flange; And a pair of clamping members coupled to and closed by the fastening member while surrounding the edges of the flange and the lid.

In addition, the radioactive waste storage drum of the present invention further includes a suction member installed inside the body for extracting air from the inside of the body, wherein the suction member includes a vertical tube installed at the center of the body and the bottom of the body. It is characterized by consisting of a plurality of horizontal tubes installed radially on the surface and provided with a plurality of holes, and a distributor for connecting the vertical tube and the horizontal tube.

In addition, according to the radioactive waste storage drum of the present invention, the round bar is coupled to the lower edge of the body and the edge of the upper plate, respectively.

In addition, according to the radioactive waste storage drum of the present invention, the upper plate is characterized in that a plurality of reinforcing members for supporting the injection tube is installed.

In addition, according to the radioactive waste storage drum of the present invention, the lid is characterized in that the thickness of the central portion is formed thinner than the edge portion.

In addition, according to the radioactive waste storage drum of the present invention, the outer peripheral surface of the clamp is formed to be inclined upward, the edge of the lid is formed to be inclined downward, characterized in that inserted into the wedge-shaped groove formed on the inner peripheral surface of the clamping member at the same time. .

The radioactive waste storage drum of the present invention can satisfy both domestic and overseas strict radioactive waste storage container manufacturing standards such as impact resistance, pressure resistance, and compression resistance, so that radioactive waste can be safely stored.

Further, according to the radioactive waste storage drum of the present invention, since the air present in the voids between the radioactive wastes stored using the suction member is removed, the voids between the radioactive wastes are minimized and the amount of radioactive wastes stored is increased. It works.

In addition, according to the radioactive waste storage drum of the present invention, since the round bar is installed on the upper and lower edge portions of the body, the strength of the upper and lower ends of the body is improved, there is an effect that does not easily deform.

In addition, according to the radioactive waste storage drum of the present invention, by reinforcing the injection tube protruding above the upper plate with a reinforcing member there is an effect that can prevent deformation or damage of the injection tube.

In addition, according to the radioactive waste storage drum of the present invention, by reducing the thickness of the center portion of the lid compared to the edge of the lid supported by the clamping member, there is an effect that can reduce the weight of the lid while ensuring sufficient pressure resistance.

Further, according to the radioactive waste storage drum of the present invention, by forming a wedge-shaped groove in the inner peripheral surface of the clamping member and forming the edge of the flange and the lid to the inclined surface, it is possible to minimize the thickness of the clamping member while maintaining the airtight between the flange and the lid It can be effective.

Hereinafter, with reference to the accompanying drawings illustrating a radioactive waste storage drum of the present invention.

1 is an exploded perspective view of a radioactive waste storage drum according to the present invention, FIG. 2 is a cross-sectional view of the radioactive waste storage drum according to the present invention, FIG. 3 is a detailed view of part "A" of FIG. 2, and FIG. Appearance perspective view of a radioactive waste storage drum.

Radioactive waste storage drum according to the present invention, as shown in Figures 1 to 4, the cylindrical body 11, the radioactive waste is stored therein; A lower plate 12 attached to a position spaced upward from the lower end of the body 11 by a predetermined degree; An upper plate 13 installed at an upper end of the body 11 and having an insertion hole 13 'formed at the center thereof; An injection tube 14 attached to the upper plate 13 so as to be connected to the insertion hole 13 '; A flange 15 attached to an upper end of the injection tube 14 and having a groove 15 ′ formed therein for inserting a packing ring 16 into an upper surface thereof; A lid 17 covering an upper surface of the flange 15; A pair of clamping members (18) coupled and sealed by a fastening member (not shown) while surrounding the edges of the flange (15) and the lid (17); Round bars 19 coupled to the bottom edge of the body 11 and the edge of the top plate 13, respectively; It is installed in the body 11 and the suction (Suction) member 20 for extracting the air in the body (11); consists of.

Here, the suction member 20 is a plurality of vertical pipes 21 installed in the center of the body 11 and a plurality of holes 22 'provided radially at the bottom of the body 11. It consists of a horizontal tube 22, a distributor (23) for connecting the vertical tube 21 and the horizontal tube (22). In addition, a plurality of reinforcing members 14 ′ supporting the injection tube 14 are radially installed on the upper plate 13.

In addition, the lid 17 is preferably formed to be thinner than the thickness of the center portion of the edge portion. In addition, the outer circumferential surface of the flange 15 is formed to be inclined upward, and the edge of the lid 17 is formed to be inclined downward, and is simultaneously inserted into a wedge-shaped groove 18 ′ formed in the inner circumferential surface of the clamping member 18.

In addition, the pair of clamping members 18 are formed with a screw portion to which the fastening screw is fastened at least one of the two fastening holes into which the fastening member is inserted so that the coupling force is increased when they are coupled to each other by the fastening member. More preferred.

The radioactive waste storage drum of the present invention configured as described above is manufactured through the following process.

First, a flat plate is rolled into a cylindrical shape and welded to produce a body 11 having a thickness of 4.5 mm, an outer diameter of 1400 mm, and a height of 1086 mm. Subsequently, the lower plate 12 of a disc shape is welded at a position spaced 150 mm from the lower end of the body 11, and a vertical tube 21, a distributor 23, and a plurality of horizontal tubes are formed inside the body 11. Install a suction member (20) consisting of (22).

Subsequently, an upper plate 13 formed of an original plate having a diameter of 1420 mm is provided at the upper end of the body 11 with an insertion hole 13 ′ having a diameter of 570 mm, and the insertion hole of the upper plate 13 is welded. An injection tube 14 having an inner diameter of 571 mm is welded around 13 ', and then a flange 15 having a diameter of 780 mm and a thickness of 25 mm is attached to the upper surface of the injection tube 14. At this time, a cylindrical groove 15 'is formed in the center of the upper surface of the flange 15, and the packing ring 16 is inserted.

In addition, a cover 17 having the same diameter and thickness as the flange 15 may be manufactured to cover the flange 15, and a pair of clamping members may be disposed on the outside of the flange 15 and the lid 17. 18 to install the flange 15 and the lid 17 to be coupled.

At this time, the edges of the flange 15 and the lid 17 are formed in an inclined surface so that both can be inserted into the wedge-shaped grooves 18 'formed on the inner circumferential surface of the clamping member 18. Accordingly, the total thickness of the clamping member 18 may be equal to the sum of the thickness of the flange 15 and the thickness of the lid 17, and the clamping member 18 may be the flange 15 or the lid. It can be prevented from protruding from (17).

In addition, the lid 17 is to cut the center portion except the edge portion in contact with the flange 15 to have only about half the thickness of the edge portion. This is to reduce the total weight of the lid 17 while increasing the thickness of the edge portion where a large load is applied.

In addition, by installing round bars 19 on the lower edge of the body 11 and the edge of the upper plate 13, reinforcement of the weak part to the external impact. In addition, a plurality of reinforcing members 14 'are radially installed on the upper plate to reinforce the injection pipe 14.

The radioactive waste storage drum of the present invention configured as described above was tested as follows.

First, it was confirmed that the size test results for measuring the dimensions of each part, including the body 11 using a tape measure, satisfies the prescribed capacity. Then, after filling 98% or more of water into the body 11, it was confirmed that no water leakage occurred in a hydraulic test that was pressurized to 15psi with water and checked for leakage for 5 minutes.

In addition, the body 11 was filled with more than 98% of water, the lid 17 was closed, and then dropped in a 45-degree angle to the concrete floor at a height of 1.2 m.

Then, after pressurizing to 7.0 psi with compressed air, the test liquid was applied to the weld joint and tested for airtightness for 5 minutes, and the result was confirmed to be good.

In addition, the penetrating portion of the lid 17, the portion close to the clamping member 18 or the thin portion of the container, such as a thin portion of the container 32 mm in diameter, 6kg by dropping the rod at 1.0m to check the penetration The test was carried out and the results were also confirmed to be good.

Subsequently, a load test was carried out using a bucket having a load equivalent to 5 times the actual weight of the container (more than 10.0 tons) to test whether it was kept in a steady state without distortion by applying a load to the upper portion for 24 hours. Was found to be good.

Here, since the lid 17 is impossible to inject water or compressed air, in the above-described hydraulic test, drop test and airtight test, the same size as that of the lid 17 so that water or compressed air can be injected therein. A test lid (not shown) was used.

The radioactive waste storage drum of the present invention described above is particularly useful for treating waste resins. Waste resin here means radioactive waste from the liquid purification system of a power plant.

Hereinafter, a process of storing radioactive waste in a drum will be described.

First, the radioactive waste and the hardener are introduced into the main body 11 through the injection pipe 14 provided on the upper part of the main body 11, and then the suction member 20 installed in the main body 11 is opened. To suck the air inside the main body (11).

As a result, a larger amount of radioactive waste is stored inside the main body 11, while the air gap between the radioactive waste becomes smaller and the gap between the radioactive waste becomes smaller.

When the solidification of the radioactive waste is completed in the main body 11 through the above process, a lid is covered on the flange 15 provided on the upper surface of the injection tube 14, and the flange (using a clamping member 18) 15) and the lid 17 is integrally combined.

At this time, the radioactive waste inside the main body 11 by inserting a packing ring 16 into the groove 15 ′ provided on the upper surface of the flange 15 to hermetically seal between the flange 15 and the lid 17. Do not leak outside of this.

Subsequently, the flange 15 and the lid are installed by the clamping member 18 by installing a pair of clamping members 18 on the outside of the flange 15 and the lid 17 and mutually fastening them using the fastening members. (17) is to remain coupled.

At this time, the edge portions of the flange 15 and the lid 17 are each formed in an inclined surface to be inserted into the wedge-shaped groove 18 ′ of the clamping member 18. Accordingly, the coupling between the flange 15 and the lid 17 can be firmly maintained and the aesthetics of the clamping member 18 can be maintained without excessively increasing the thickness of the clamping member 18.

Although the preferred embodiment of the present invention has been described above, the scope of the present invention is not limited only to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

1 is an exploded perspective view of a radioactive waste storage drum according to the present invention.

2 is a cross-sectional view of the radioactive waste storage drum of the present invention.

3 is a detailed view of portion “A” of FIG. 2;

Figure 4 is an external perspective view of the radioactive waste storage drum of the present invention.

<Explanation of symbols for the main parts of the drawings>

11: body 12: bottom plate

13: top plate 13 ': insertion hole

14: injection tube 14 ': reinforcing member

15: Flange 15 ': Groove

16: packing ring 17: lid

18: clamping member 19: round bar

20: Suction 21: Vertical tube

22: Horizontal tube 23: Distributor

Claims (6)

A cylindrical body 11 in which various radioactive wastes are stored therein; A lower plate 12 attached to a position spaced upward from the lower end of the body 11 by a predetermined degree; An upper plate 13 installed at an upper end of the body 11 and having an insertion hole 13 'formed at the center thereof; An injection tube 14 attached to the upper plate 13 so as to be connected to the insertion hole 13 '; A flange 15 attached to an upper end of the injection tube 14 and having a groove 15 ′ formed therein for inserting a packing ring 16 into an upper surface thereof; A lid 17 covering an upper surface of the flange 15; And a pair of clamping members (18) coupled and sealed by the fastening member while surrounding the edges of the flange (15) and the lid (17). The method of claim 1, Is installed inside the body 11 further includes a suction member 20 for extracting the air in the body 11, The suction member 20 includes a vertical tube 21 installed at the center of the body 11 and a plurality of horizontal tubes radially installed at the bottom of the body 11 and provided with a plurality of holes 22 '. (22), and a distributor (23) characterized in that consisting of a distributor (23) connecting the vertical pipe (21) and the horizontal pipe (22). The method of claim 1, Radioactive waste storage drum, characterized in that the round bar 19 is coupled to the lower edge of the body (11) and the edge of the upper plate (13), respectively. The method of claim 1, A radioactive waste storage drum, characterized in that a plurality of reinforcing members (14 ') for supporting the injection pipe 14 is installed on the upper plate (13). The method of claim 1, The lid 17 is a radioactive waste storage drum, characterized in that the thickness of the central portion is formed thinner than the edge portion. The method of claim 1, The outer circumferential surface of the flange 15 is formed to be inclined upward, the edge of the lid 17 is formed to be inclined downward, and is simultaneously inserted into the wedge-shaped groove 18 'formed on the inner circumferential surface of the clamping member 18. Radioactive waste storage drum.

Images