JPS60183383A - Upper hatch for lining vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an upper hatch of a lined container that seals and shields an opening formed in the upper part of the lined container.

[Technical background of the invention and its problems] Recently, with the increase in the capacity of nuclear power generation equipment, various containers for storing radioactive waste, condensate, etc. have also become larger, and linings with high volumetric efficiency are being used instead of conventional tanks. container is used.

Similar to conventional tanks, this lined container also has a hatch formed in its upper part for inspection, repair, and carrying in equipment. This hatch is made of concrete from the viewpoint of radiation shielding, and there is a problem in that a complete sealing effect cannot be achieved due to problems with the precision of concrete molding.

Also, since it is made of concrete, the hatch is heavy,
There are problems in that it is difficult to handle, and it is difficult to decontaminate the underside of the hatch when it becomes radioactively contaminated by the storage liquid.

Fig. 1 and Fig. 2 show that the outside of the concrete hatch 1 is covered with a lining plate 2r:ffl, and the concrete
Line the opening 3 into which the hatch 1 is inserted with a lining plate/IT”
This shows an N-hatch, and by lining the concrete hatch 1 and the opening 3 in this way, the sealing effect can be enhanced.

However, with such a hatch, it is necessary to precisely fit the concrete hatch 1 and the opening 3, and it is very difficult to secure enough space for the packing 5 to be inserted between them. , which ultimately impairs economic efficiency.

If an even larger opening is required, a hatch with a split design is used depending on the lifting capacity of the lifting machine 6 of the T1 concrete hatch 1, but in this case, the seal structure becomes compound and the overall A good configuration becomes extremely difficult.

[Object of the invention] The present invention has been made in response to such conventional circumstances,
Its primary purpose is to provide a lined container top hatch with good sealing properties. 1: The second object is to provide a part hatch for a lined container that is easy to manufacture and handle and is lightweight. A third object is to provide an upper hatch for a lined container that is easy to decontaminate with little radioactive contamination.

[Summary of the Invention] That is, the present invention provides an upper hatch of a lined container that seals and shields an opening formed in the upper part of the lined container, and a concrete structure that is disposed in one part of one part and performs radiation shielding. This is a partial hatch of a lined container characterized by comprising a hatch and a leakage prevention 1F sealing device disposed at the lower part of the opening and sealing a part of the space.

[Embodiment of the Invention] 3- The details of the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 3 shows a lined container equipped with an upper hatch of a lined container according to an embodiment of the present invention.
No. 1 7 shows a lined container in which the bottom, side and large moons are each lined with lining plates 8.

This lining container 7 contains a radioactive waste liquid 9. A building frame 10 is disposed above the lining container 7, and a frontage portion 11 having a stepped portion is formed in the center of the building frame 10.

A concrete hatch 12 having radiation shielding and floor functions is disposed above the opening 11. A leak-preventing sealing lid 13 for sealing the opening 11 is disposed at the lower part of the frontage 11. Further, a lifting machine 6 is disposed above the opening 11.

FIG. 4 shows details of the hatch portion in FIG. 3. In the figure, reference numeral 12 indicates a concrete hatch placed above the opening 11. Opening 11
An annular holding frame 14 formed to protrude toward the opening 11 is fixed to the lower surface of the holding frame 14 . A sealing lid main body 15 is placed on this annular holding frame 14, and the sealing lid main body 15 and the holding frame 171I are coupled with bolts 16.

Further, a seal 1 is provided between the airtight lid body 15 and the holding frame 14.
7 has been inserted. A handle 18 for lifting the sealing lid body 15 is provided on the sealing lid body 15.

The upper hatch of the 1c-lined container constructed as described above is used, for example, as described below.

That is, first, the concrete hatch 12 is lifted by the lifting weight M6 and moved to a predetermined position.

Next, the upper surface of the sealing lid main body 15 is inspected to check for water leakage, gravel, foreign matter, etc., and if any of these are present, appropriate treatment such as replacing the seal 17 is taken. After this, the sealing lid main body 15 is moved to a predetermined position by the lifting machine 6 using the handle 18, and a predetermined operation or opening 11 is performed.
The equipment will be moved in and out using. Further, the opening 11 is closed in the reverse order of the operation of the child chain.

Furthermore, when the hatch is to be opened for a long period of time for periodic inspections or repairs, the concrete hatch 12 is not used and only the leak-preventing sealing lid 13 is used for the work.This improves work efficiency and safety. It is possible to improve the performance and prevent foreign matter from falling or flowing into the lining container 7.

FIG. 5 shows another embodiment of the present invention, in which the present invention is applied to a split hatch for large openings. That is, in this embodiment, the concrete hatches 20, 21, and 22 are divided into three parts depending on the capacity of the lifting machine 6 and the frequency of opening and closing.

Hatch 20 is the one that is most frequently removed, and can be used for booth C work or when general access is possible.Hatch 21 and 22 are used when a larger opening is required. It is removed depending on the size of the frontage required.

In this embodiment, the sealing lid main body 23, 24, and 25 is also divided into three parts corresponding to the hatches 20, 21, and 22. A small opening is formed in the sealing lid main body 23, and this small opening is sealed by a small sealing member M26. This small sealing M26 is used when only the hatch 20 is removed, and by leaving this small sealing lid 26 in between, the pressure inside the lining container γ can be made the same as the external pressure, and it is sealed! 23 to facilitate removal.

The sealing lid bodies 24, 25 are opened and closed in response to opening and closing of the hatches 21, 22, respectively. MarCN airtight lid body 23-2
4 and between 2/l and 25, a sealing lid reinforcing metal fitting 27 is provided. This sealing lid reinforcing metal fitting 27 is protected against heavy loads due to sloshing etc.
This prevents excessive stress from occurring on the surface.

That is, the inside of the lining container 7 is normally 50 w
Since the pressure is reduced by a pressure difference of about A Q, the airtight lid body 23.
A pressure as large as 8/TlI2 is acting on 24.25 on 50.

In the upper part 7 hatch of the lining container constructed as described above, since the hatch is divided, the hatch can be removed depending on the size of the opening required, and workability can be improved.

FIG. 6 shows still another embodiment of the present invention, in which the upper hatch sealing lid body 1 shown in FIG.
A through hole 30 is drilled in the center of 5, and a small sealing lid 33 equipped with a seal 31 and a handle 32 is disposed above the through hole 30.

In the upper hatch configured in this way, the pressure inside the lining container 7 can be made the same as the external pressure by opening the small seal m33, as in the upper hatch shown in FIG. The lid main body 15 can be easily removed.

[Effects of the Invention] As described above, according to the second hatch of the lined container of the present invention, the concrete hatch has a shielding function and the leak-preventing sealing lid has a sealing function. The sealing performance of the lined container can be greatly improved compared to the conventional one, and thereby leakage of radioactive substances from the lined container can be completely prevented.

Further, according to the upper hatch of the lined container of the present invention,
It becomes possible to easily divide the concrete hatch into a plurality of parts, and the weight per unit of the concrete hatch can be reduced. In general, the requirements for dimensional accuracy of concrete hatches are significantly relaxed compared to before.
Design, manufacturing, inspection, etc. become easier. Furthermore, since the concrete hatch and the opening are not contaminated with radioactive substances, the radiation exposure of workers can be reduced.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing the upper hatch of a conventional lined container, FIG. 2 is an enlarged vertical sectional view of the concrete hatch in FIG. 1, and FIG. FIG. 4 is a longitudinal cross-sectional view showing an enlarged upper hatch of the lined container of FIG. 3; FIG. 5 is a longitudinal cross-sectional view showing another embodiment of the upper hatch of the lined container of the present invention. The plan view and FIG. 6 are longitudinal sectional views showing still another embodiment of the present invention. 6... Lifting machine 7... Lining container 11...
......Opening 12.20.21.22 ...Concrete hatch 13 ......Leakage prevention seal 14.
......... Holding frame 15.23.2-1.25 ... Sealing device body 26 ...... Small sealing lid 27 ...
・・・・・・Reinforcement Hardware Agent Patent Attorney Suyama 4ji
]-11- Figure 1

Claims (1)

[Scope of Claims] <1) In an upper hatch of a lining container that seals and shields an opening formed in the upper part of the lining container, a concrete hatch is provided above the opening to shield radiation; and the opening 1. An upper hatch for a lined container, comprising: a leak-preventing sealing lid disposed at a lower part of the hatch for sealing the opening. (2) The leak-prevention sealing lid includes an annular holding frame that is formed to protrude toward the opening along the lower surface of the opening, and a sealing lid that is inserted into the opening and whose outer periphery is placed on the holding frame. The upper hatch of a lined container according to claim 1, comprising a main body and a seal inserted between the sealing lid main body and the holding frame. (3) The upper hatch of the lined container according to claim 1 or 2, wherein the leak-preventing sealing lid has a small opening that is sealed by the small sealing lid. (4)] The upper hatch of a lined container according to any one of claims 1 to 3, wherein the concrete hatch and the leak-preventing sealing lid are divided into a plurality of parts.