JPH032880Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a radioactive waste storage container used to store radioactive waste contaminated with radioactivity generated from nuclear power plants and the like.

(Prior Art) In order to store radioactive waste contaminated with radioactivity generated from nuclear power plants and the like, drums lined with heavy concrete and lined with heavy concrete have traditionally been used. This heavy concrete inner drum has a heavy concrete inner lid, and the worker engages the hook bolt with a single hook bolt locking nut buried in the center of the inner lid, and then hooks the wire. It was then hoisted up using a hoist, etc., and the inner lid was opened and closed.

(Problem that the invention aims to solve) However, in order to close the inner lid of such a heavy concrete inner drum after storing radioactive waste inside, two or more workers must perform slinging work at close positions. First, there was a high risk of exposure to radiation, and there were other problems, such as the inner lid tilting and being damaged because it was lifted with a single hook bolt.

(Means for solving the problems) The present invention solves the conventional problems as mentioned above,
It was completed for the purpose of a radioactive waste storage container that allows the inner lid to be opened and closed without fear of radiation exposure, and the inner lid will not be damaged. A steel plate for attracting electromagnets and a plurality of nuts for locking hook bolts are connected to the reinforcing bars, and an inner cover is fitted into the opening of a drum having a lining layer made of heavy concrete. It is something.

(Embodiment) Next, the present invention will be explained in detail with reference to the illustrated embodiment. Reference numeral 1 is an ordinary drum can containing 200 drums, and the inner surface has a lining layer 2 made of heavy concrete.
is formed. It is preferable to use heavy concrete that contains pyrite and has a specific gravity of 4 or more, and its thickness can be freely set depending on the nature of the radioactive waste to be stored inside. When storing rags etc. contaminated with radioactivity emitted from the air, a width of approximately 50 mm is sufficient. In addition, an inner lid locking part 3 with a tapered surface is formed on the upper end of the lining layer 2, and the inner lid locking part 3 has a tapered surface and a flat part following the tapered surface. It is preferable to apply a synthetic resin lining 4 to improve the performance. 5
is a disk-shaped inner cover, and the inner cover 5 has a steel plate 7 for attracting an electromagnet on the upper surface of the central part of a heavy concrete board 5a containing reinforcing bars 6 such as reinforcing bars.
The steel plate 7 is connected to the steel plate 7 and buried, and two to four hook bolt locking nuts 8 are installed around the steel plate 7.
The reinforcing bars 6 are connected to the reinforcing bars 6 by welding to the reinforcing bars 6 or directly to the reinforcing bars 6. The outer peripheral surface of the inner lid 5 is formed into a tapered surface corresponding to the tapered surface of the inner lid locking part 3, and furthermore, an L-shaped steel material is bent into a ring shape at the lower corner of the outer peripheral surface. A reinforced reinforcing material 9 is embedded to prevent damage to the inner lid 5. Such an inner lid 5 is fitted into the opening of the drum can 1 with its tapered surface brought into close contact with the tapered surface of the inner lid locking part 3, and an outer lid 11 made of a steel plate with a gasket 10 is attached from above. It is attached by a band 12 having a dogleg-shaped cross section to store radioactive waste. A metal fitting 14 having a bolt insertion hole 13 at the bottom is welded to each end of the band 12, and by tightening these metal fittings 14, 14 with a bolt 15, the band 12 is attached to the upper end curl portion 16 of the drum 1. can be fixed to. Furthermore, it is preferable to provide a synthetic resin lining 17 on the inner surface of the inner lid 5 to improve decontamination performance.

(Function) The device configured as described above stores radioactive waste contaminated with radioactivity generated from nuclear power plants etc. inside the drum can 1, and the drum can 1 made of steel plate.
and a heavy concrete lining layer 2 with excellent radiation shielding properties formed on its inner surface, and a heavy concrete inner cover fitted into the inner cover locking part 3 of the opening at the upper end. It is used to store radioactive waste while preventing leakage of radiation to the outside and scattering of the contents by the double structure of 5 and outer lid 11, but the one of the present invention is A steel plate 7 for electromagnet attraction is attached to the top surface of the lid 5 in connection with reinforcing bars 6, so the inner lid 5 is attracted by the electromagnet attached to an overhead crane or the like, and the inner lid is opened and closed in a stable posture. At this time, there is no need for workers to perform sling work as in the past, and remote control is possible, eliminating the risk of workers being exposed to radiation.Moreover, the steel plate 7
is connected to the reinforcing bars 6 of the inner cover 5, so the steel plate 7 will not separate from the inner cover 5 during lifting.
The work can be done safely. Furthermore, when used in a place where there is no equipment such as an electromagnetic overhead crane, stable lifting can be achieved by engaging the hook bolts with a plurality of hook bolt locking nuts 8. Furthermore, as in the illustrated embodiment, the outer peripheral surfaces of the inner cover locking part 3 and the inner cover 5 are tapered, and reinforcing material 9 is provided at the lower corner of the inner cover 5.
If it is assumed that the inner cover 5 is attached, centering will be automatically performed even if the centers of the inner cover 5 and the inner cover locking part 3 do not coincide when the inner cover 5 is lowered to close it. This makes the lid-closing work easier, and there is no fear that the lower corner portion of the inner lid 5 will be damaged.

(Effects of the invention) As is clear from the above explanation, this invention allows workers to open and close the inner lid without exposing themselves to radiation, and can also be used in locations without equipment such as electromagnetic overhead cranes. Moreover, it is possible to prevent the inner lid from tilting and damage, and its practical value is that it eliminates the problems of conventional radioactive waste storage containers of this type. It is extremely large.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view. DESCRIPTION OF SYMBOLS 1... Drum, 2... Lining layer, 3... Inner lid locking part, 5... Inner lid, 5a... Heavy concrete plate material, 6... Reinforcement bar, 7... Steel plate, 8... Hook bolt locking nut, 9...Reinforcement material.

Claims (1)

[Scope of claim for utility model registration] 1 Heavy concrete plate material 5a with 6 reinforcing bars
An opening of a drum 1 having a lining layer 2 made of heavy concrete has an inner lid 5 attached to the top surface with a steel plate 7 for electromagnet attraction and a plurality of hook bolt locking nuts 8 connected to the reinforcing bars 6. A radioactive waste storage container characterized by being fitted with a. 2 Inner lid locking part 3 with tapered surface at the upper end of lining layer 2
The radioactive waste storage container according to claim 1, wherein the outer circumferential surface of the inner lid 5 is formed into a tapered surface corresponding to the tapered surface. 3. The radioactive waste storage container according to claim 1 or 2, wherein the hook bolt locking nuts 8 are arranged around the steel plate 7, and the number thereof is 2 to 4. 4. The radioactive waste storage container according to claim 1, 2, or 3, wherein the lining layer 2 and the inner lid 5 are lined with synthetic resin. 5. The radioactive waste storage container according to claim 1 or 2 or 3 or 4, wherein the inner lid 5 has a reinforcing member 9 at its lower corner.