JPH0458599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for storing high level solid waste.

Methods exist for containing and packaging high-level solid waste from motive power waste treatment facilities for treatment.

Conventionally, as shown in FIG. 2, high-level solid waste A' is first sealed in a metal can a by a manipulator and inserted into a steel shielded container b.

Next, the shielded container b is transported by a crane or the like, placed on a steel pallet d in advance, and placed inside a reinforced concrete container c with an open top.

Thereafter, the opening of the reinforced concrete container c is reinforced with reinforcing bars e, and the reinforced concrete c containing the shielding container b is filled with concrete f, and after hardening, it is transported by a forklift or the like and stored in stacks.

Such conventional high-level solid waste storage methods have room for improvement in several respects, as listed below.

(b) Since there is nothing to cover the top of the steel shielding container b, which is open at the top, radiation control during transportation and installation work until it is installed in the reinforced concrete container c becomes complicated.

(b) The filled concrete f may crack due to drying shrinkage at the contact surface with the shielding container b, and since a portion of the filled concrete f is exposed to the outside, there is a risk of rainwater infiltrating in the long term. There is.

(c) Containers P' containing high-level solid waste A' in the above method are stacked with an earthen concrete floor B.
A steel pallet d is required on top of the container P', and since the weight of the container P' is large, the conventional steel pallet d can only be stacked in two stages.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for storing high-level solid waste that is more superior in terms of safety and workability than conventional methods.

Next, the method of storing high-level solid waste according to the present invention will be explained, but before that, the container used in the present invention will be explained. (Figure 1) (a) Metal can and shielding container The metal can 1 is a well-known container capable of enclosing high-level solid waste A.

The shielding container 2 is a well-known steel box-shaped container with an open top.

The shielding container 2 is sized to have enough depth and width around it when the metal can 1 is stored therein.

(b) Primary container The primary container 3 is a box made of reinforced concrete, and has sufficient depth when the shielding container 2 is stored inside.

(c) Secondary container The secondary container 4 is a reinforced concrete box with an open top that houses the primary container 3.

The size of the container should be such that there is sufficient depth and width when the primary container 3 is stored.

Furthermore, a protruding portion 41 is provided on the external bottom surface, which protrudes in an area slightly smaller than the bottom surface.

Further, on the upper opening side, there is a lid receiving part 43 having a flange protruding inward to receive a lid 42 to be described later.

Furthermore, hooks for hanging work and leveling are attached to the upper and lower exteriors of the secondary container 4.

(d) Lid The lid 42 is a plate made of reinforced concrete that closes the opening of the secondary container 4.

A recess 44 is provided on the upper surface of the secondary container 4 in which a protrusion 41 protruding from the bottom of the secondary container 4 is fitted.

Further, a plurality of vertically penetrating grout holes 45 are formed in the plate-shaped lid 42.

Next, a method for storing high-level solid waste using each of the above-mentioned members will be explained.

(B) Storage in the primary container The metal can 1 containing the high-level solid waste A is inserted into the shielded container 2 using a known simple crane or the like.

Then, the shielding container 2 is installed in the primary container 3 with the opening facing upward, and is filled with concrete 5.

Concrete 5 is shielded container 2 in primary container 3
and the metal can 1 and into the primary container 3 and harden.

(c) Storing in the secondary container The primary container 3 filled with concrete 5 is installed in the secondary container 4.

After that, the lid body 42 is attached to the lid receiving part 43 of the secondary container 4.
It is placed on top of the secondary container 4 to close the opening of the secondary container 4.

At this time, the lid 42 is positioned so that the recess 44 faces the outside of the secondary container 4.

If high-level solid waste A is expected to generate heat, a pipe may be installed between the primary container 3 and the secondary container 4 and connected to the outside through the grout hole 45 to circulate cold water. It is also conceivable to cool it down.

(c) Grout injection Inject grout material 6 such as mortar from the grout hole 45 of the lid 42 into the second hole closed by the lid 42.
Next, the hollow part of the container 4 and the grout hole 45 are filled.

(d) Storage of containers in stacks (Fig. 1) Containers P ₁ and P ₂ are stacked on top of container P placed on concrete floor B using a forklift or the like.

At this time, the protrusion 41 on the bottom of the containers fits into the recess 44 of the lid 42, creating stable stacking.

Since the present invention is as described above, the following effects can be expected.

(b) When transporting and installing high-level solid waste in the final secondary container, the opening of the shielding container is already blocked with concrete and the shielding performance is improved. radiation management is easy.

It is also possible to save labor in the transportation equipment within the processing facility.

(b) Since the concrete is already filled when installed in the primary container, and the secondary container is further stored and filled with grout, the shielding performance is further improved.

Further, since the concrete in direct contact with the metal can is surrounded by a secondary container closed with grout and a lid, rainwater cannot penetrate.

(c) It has good shielding performance, so it can be installed directly on a concrete floor.

Therefore, there is no need to use steel pallets that have a limited load weight, so multi-level stacking is possible.
It is economical and increases storage capacity.

(d) A protrusion and a recess are provided on the bottom of the secondary container and the top of the lid so that they fit together, allowing stable stacking.

(e) If the container has a lid, the lid must be fastened to the container with bolts, etc. while avoiding radiation from the radioactive waste contained in the container.

To perform this work, a manipulator that can perform complex tasks remotely is required.

In contrast, in the present invention, since the primary container is of the top-opening type without a lid, radiation can be quickly blocked by placing concrete that functions as a lid material inside the primary container.

Therefore, radioactive waste can be stored efficiently and economically without the need for a manipulator.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a container according to the present invention, and FIG. 2 is an explanatory diagram of a conventional high-level solid waste container. 1...metal can, 2...shielding container, 3...
Primary container, 4... Secondary container, 5... Concrete, 6... Grout material, A... High level solid waste, P... Container.

Claims (1)

[Claims] 1. A first step of using a top-opening shielded container for storing high-level solid waste, storing high-level solid waste in the shielding container, and placing the high-level solid waste in the first container. a second step of accommodating the shielding container and filling the primary container with concrete; and accommodating the primary container in a secondary container with a convex portion on the bottom surface and grouting the secondary container. A third step of filling the secondary container with a material, and a fourth step of installing the upper opening of the secondary container with a top lid having a recessed portion corresponding to the convex portion of the secondary container on its upper surface. How to store high-level solid waste.