JPH0533998Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a top plate sealed structure of a radioactive waste storage container for storing waste cans filled with radioactive waste, etc.

"Prior Art and Its Problems" In general, low-level radioactive waste generated in nuclear power plants and the like can be easily handled by, for example, being packed in drums (waste cans). The waste contained in the waste can is stored in a storage facility provided within the plant.

However, the above-mentioned processing method has the following problems that need to be solved.

In other words, with the increase in low-level radioactive waste generated within plants, it is becoming difficult to secure storage facilities within the plants.

Therefore, the construction of a dedicated stocking area has been proposed, and the idea is to transport the waste cans to the stocking area, but some of these waste cans are thought to be corroded, so If the waste cans are removed from the plant, there is a risk that the environment including the transport route of the waste cans and the storage location at the destination of the waste cans will be contaminated. Therefore, it is desired to develop a container for transportation that can contain these waste cans and store them in a storage area as is. In addition, storage containers used for such purposes must not only not leak radiation, but also have impact resistance in case of accidents during transportation, as well as storage containers. Durability and water permeability are required so that radioactivity does not leak out at the site.

Conventionally, as a storage container for storing the waste can,
A concrete container with a developed upper part is provided, waste cans containing low-level radioactive waste are stored in the container, and after filling the gaps between these waste cans with mortar, etc., a concrete lid is attached. Place it,
A storage method has been proposed in which the concrete container and the concrete lid are joined together using an adhesive or the like.

However, in such concrete-structured storage containers, the top plate is sealed with adhesive, etc., so it is difficult to obtain sufficient sealing properties, and the solution is said to be poor in impact resistance. I have a problem that needs to be addressed.

``Means for Solving Problems'' Therefore, in this invention, in the top panel of a container that stores waste cans filled with radioactive waste, etc., the top plate of the container is sealed, and the bottomed cylindrical steel container body is opened at the top. A concrete layer is formed along the outer periphery of the bottom plate and the peripheral wall of the container, and the upper end of the concrete layer formed along the peripheral wall is formed to protrude above the upper end surface of the container body, and a top plate is placed inside the concrete layer. A part of the concrete casting space is formed, and a part of reinforcing reinforcing bars buried vertically in the concrete layer is projected into this concrete casting space, and the concrete casting space is formed at the upper end of the container body. A flange portion exposed to the installation space is provided, a steel lid body that closes the upper opening of the container body is welded onto the flange portion, and reinforcing reinforcing bars that protrude into the concrete placement space are bent and placed on the lid body. The lid is wrapped in reinforcing reinforcing bars, and concrete is poured onto the lid.

``Function'' The storage space of the waste can filled with radioactive waste, etc. is sealed by the steel container body and the steel lid, and the outer periphery of these is covered with concrete. By wrapping the buried reinforcing steel with the reinforcing steel on the lid, the integration of the concrete layer around the container body and the concrete cast on the top plate is strengthened, improving the impact resistance of the storage container. and durability is improved, and its sealing performance is improved.

"Embodiment" An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the storage container before sealing, and as shown in FIG. A concrete layer 3 is formed, and the upper opening of the container body 2 is covered with a steel lid 4.
The basic structure is completed by covering the cover body 4 with concrete 5 and pouring concrete 5 on top of the cover body 4.

The container body 2 has a cylindrical shape with an open top and a bottom, and has an inner diameter and a depth equal to the height of the waste cans 6 so that a plurality of waste cans 6 (four in the illustrated example) can be accommodated therein. waste can 6
It is set larger than the outer diameter of the surrounding area.
As shown in FIG. 3, a flange portion 10 on which the lid body 4 is placed is formed at the upper end of the container body 2 using an angle material.

In addition, the bottom plate part 2a and the peripheral wall part 2 of the container body 2
As shown in FIGS. 2 to 6, reinforcing steel members 11 extending in the longitudinal direction and arranged in parallel at intervals along the width direction are integrally provided in b, and these reinforcing steel members 11 are provided with a lattice. Reinforcement reinforcing bars 12 arranged in a shape are integrally connected.

The reinforcing steel material 11 is bent into a mountain shape in which peaks and valleys alternately continue in an uneven manner along its longitudinal direction, and the valleys (protrusions on the valley side) are connected to the outer surface of the container body 2. A part of the reinforcing reinforcing steel 12 is placed along the peak (projection on the peak side) of this reinforcing steel material 11, and is fixed together by a method such as welding. It is connected to the upper part by a method such as welding.

Note that the reinforcing steel material 11 of the bottom plate portion 2a is
The reinforcing steel members 11 of the peripheral wall portion 2b extend in the vertical direction of the container body 2 and are arranged in parallel at intervals in the width direction.

Further, reinforcing reinforcing bars 12 extending in the vertical direction within the reinforcing reinforcing bars 12 disposed on the peripheral wall portion 2b of the container body 2
protrudes above the upper end of the container body 2 by a predetermined length. These reinforcing bars 12 are arranged so as to surround the upper opening of the container body 2, as shown in FIG. 1, and furthermore, as shown in FIG. As shown in FIG. 3, when it is driven in, it is bent in the middle and wraps with the reinforcing reinforcing bar 12 disposed on the lid body 4.

On the other hand, a part of the upper end 3a of the concrete layer 3 formed along the peripheral wall 2b of the container body 2 protrudes above the upper end surface of the container main body 2 (in the illustrated example, the upper end surface of the flange portion 10), A concrete casting space S for the top plate portion is formed inside the space.

Next, as shown in FIG. 3, the lid 4 that closes the upper opening of the container body 2 is placed with its peripheral edge on the flange 10 of the container body 2, and these peripheral edges and the flange 10 are connected. By welding, it is firmly fixed to the container body 2. Further, on the upper outer circumferential surface of the lid body 4, bent reinforcing steel members 11 having a chevron shape are provided in a lattice-like manner in the front, back, left and right directions, similar to the reinforcing steel members 11 of the bottom plate portion 2a of the container body 2. Further, a reinforcing reinforcing bar 12 is connected to the reinforcing steel material 11 by welding or the like, as shown in FIG. The reinforcing bars 12 thus arranged in a lattice pattern on the lid 4 are connected to the reinforcing bars 12 that protrude into the concrete placement space S from the upper end of the concrete layer 5.

In the figure, the symbol 15 indicates hanging fittings embedded in the four corners of the upper surface of the concrete layer 3, and the symbol 16 indicates a gap formed in the upper end surface of the concrete layer 3, which is provided for the purpose of avoiding the thermal effects on the concrete when the lid is welded.

Next, the operation of the embodiment configured as described above, the processing procedure for the waste can 6, etc. will be explained below.

To seal the waste can 6 inside the storage container 1, first, as shown in FIG. Store the waste can 6,
After filling the gaps between these waste cans 6 with mortar or the like, the upper opening of the waste cans 6 is covered with a lid 4, the peripheral edge of which is overlapped with the flange 10, and welded along the peripheral edge.

Next, the reinforcing bars 12 protruding from the upper end of the concrete layer 3 are bent onto the lid 4 and wrapped around the reinforcing bars 12 of the lid 4, so that the concrete 5 is placed on the lid 4 as shown in FIG. to be poured.
When the concrete 5 is poured in this manner, the concrete 5 flows into the opening formed between the reinforcing steel material 11 and the lid body 4 and becomes integrated with the reinforcing steel material 11, the reinforcing reinforcing bars 12, etc., thereby preventing the concrete 5 from peeling off. Ru. Moreover, since the reinforcing steel 11 acts to disperse cracks in the concrete 5 rather than expanding them, the unifying effect can be further strengthened, and its durability and impact resistance can be improved. I can do it.

In addition, after the concrete 5 hardens, the reinforcing reinforcing bars 12 buried in the concrete layer 3 are fixed in a state where they are wrapped around the reinforcing reinforcing bars 12 on the lid 4. Integration with concrete 5 to be placed is further strengthened,
The impact resistance and durability of the storage container are improved, and the sealability thereof is also improved.

In addition, the storage container 1 with the waste can 6 sealed in this way is, for example, attached to the hanging fitting 15 via a shackle with a binding cable, suspended by a crane or the like, loaded onto a trailer, etc., and placed on the trailer. It is then transported to a predetermined storage location (trench) and stored.

As described above, the waste can 6 is sealed in the storage container 2 which has a composite structure made of steel plates and concrete, and is protected by the storage container 2 which has excellent impact resistance and waterproof properties. , the top plate portion of the storage container 1 is covered with concrete 5,
And reinforcing reinforcing bars 1 buried in concrete layer 3
2 is wrapped around the reinforcing steel bars 12 on the lid body 4, thereby forming a concrete layer 3 on the outer periphery of the container body 2.
This strengthens the integration with the concrete 5 cast on the top plate and ensures that the sealed state is maintained, which improves safety when transporting the waste cans 6 and also improves storage. However, there is no risk that the storage area, etc., will be contaminated by radioactivity leakage.

Further, in the embodiment, since the hanging fitting 15 allows movement by a crane or the like, there is no disadvantage in terms of handling, and it is possible to reduce the transportation work and speed up the transportation processing work.

"Effect of the invention" As explained above, according to the invention, the upper end of the concrete layer formed along the peripheral wall of the bottomed cylindrical steel container body with an open top is lower than the upper end surface of the container body. A concrete casting space for the top plate is formed inside of the concrete casting space by protruding upward, and a part of reinforcing reinforcing bars buried vertically in the concrete layer is projected into this concrete casting space. , a flange portion exposed to the concrete placement space is provided at the upper end of the container body;
Welding a steel lid that closes the upper opening of the container body onto the flange portion, bending reinforcing bars protruding into the concrete placement space and wrapping them around the reinforcing bars disposed on the lid, and Since it is made by pouring concrete onto the lid, it exhibits the following excellent hardening properties.

It has a double structure of a steel container and a concrete layer covering its outer periphery, so unlike a simple concrete structure, it has excellent impact resistance and durability, and even if the outer concrete is subjected to impact etc. The internal container reliably maintains airtightness, thereby reliably preventing radioactive contamination of the route for transporting the waste can, thereby improving safety during transport.

By wrapping the reinforcing bars buried in the concrete layer with the reinforcing bars on the lid,
This strengthens the integration between the concrete layer around the container body and the concrete cast on the top plate, improving the impact resistance of the entire container, and also prevents organic substances such as adhesives from sealing the lid. Since no organic substances are used, there is no risk of deterioration of organic substances, and the applicability to long-term storage of radioactive waste cans can be improved.

Furthermore, the double structure of the steel container and concrete layer allows the storage container to satisfy not only durability and impact resistance, but also water permeability, so it can be used as a storage container for waste cans filled with radioactive waste. We can provide a suitable container, which not only has impact resistance in case of accidents during transportation, but also can reliably prevent the release of radioactivity at storage locations, and meets the requirements for durability and water permeability. can be satisfied.

Due to the above, excellent practicality can be exhibited especially as a storage container for corroded waste containers.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment of the present invention, in which Figure 1 is a perspective view of the storage container before sealing, Figure 2 is a sectional view thereof, and Figure 3 shows the structure of the top plate. 4 and 5 are a front view and a sectional view of the main parts shown, respectively.
The figure is a sectional view of the storage container, and FIG. 7 is a plan view showing the state in which the lid is attached. DESCRIPTION OF SYMBOLS 1... Storage container, 2... Container body, 2a... Bottom plate part, 2b... Peripheral wall part, 3... Concrete layer,
4...Lid body, 5...Concrete, 6...Waste can, 10...Flange part, 11...Reinforcement steel material, 1
2... Reinforcement reinforcing bars, 15... Hanging fittings, S... Concrete placement space.

Claims (1)

[Scope of utility model registration request] In the case where the top plate of a container for storing waste cans filled with radioactive waste, etc. is sealed, a concrete layer is placed along the outer periphery of the bottom plate and peripheral wall of the bottomed cylindrical steel container body with an open top. At the same time, the upper end of the concrete layer formed along the peripheral wall is formed to protrude above the upper end surface of the container body to form a space for placing concrete for the top plate inside, and furthermore, this concrete layer is A part of reinforcing reinforcing bars buried vertically in the concrete layer protrudes into the space, and a flange portion exposed to the concrete placement space is provided at the upper end of the container body, and a flange portion is provided on the flange portion. A steel lid that closes the upper opening of the container body is welded, and the reinforcing bars protruding into the concrete placement space are bent and wrapped around the reinforcing bars placed on the lid.
and a top plate sealed structure of the radioactive waste storage container, which is formed by pouring concrete onto the lid.