JPS5991394A - Method of fixing equipment - 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 [Field of Application of the Invention] The present invention relates to a method for installing equipment in a container without contaminating the atmosphere, and particularly relates to a method for installing equipment in an atomic couplant.

[Prior art]

For example, the installation of a primary sodium circulation pump in a fast breeder reactor using sodium as a coolant was carried out by the method shown in FIGS. 1 and 2.

In FIG. 1, the pump storage container 10 is connected to the roof slab 1.
2, an upper end 14 is identified, and a glove box 16 is installed on this upper end 14. A partition plate 18 is provided near the lower end of the glove box 16 to isolate the inside of the pump storage container 10 from the outside air 20.

The pump 22 is housed in a lead cask 24 and then suspended by an internal crane 26.

The cask 24 is then conveyed above the glove box 16 by a general conveyor 30 whose lower end is closed by a partition plate 28 .

After that, as shown in FIG. 2, the casters 24 and the glove box 16 are fully connected, and the nozzle 32°
, 40, 42, the inside of the cask 24, the inside of the glove box 16, and the inside of the pump storage container IO are exchanged with gas. After completing the gas replacement, open the partition plates 18 and 28,
The pump 22 is moved into the pump storage container 1 by the internal crane 26.
Suspend it within 0. However, this method has the following drawbacks.

(1) Since the pump 22 is transported by being housed in the cask 24, which also serves as a radiation shield when the pump 22 is pulled out, transporting heavy objects not only deteriorates work efficiency but also poses a danger. accompanies.

(2) To install the pump 22, the cask must be lowered onto the glove box 16 using the carrier 3o, and then the pump 22 must be lowered into the pump storage container 10 using the internal crane 26 inside the cask 24. , work is duplicated.

(3) After the pump 22 is installed, it is necessary to decontaminate the inside of the cask 24 to avoid contamination of the inside of the cask 24 with radioactive substances inside the reactor vessel.

[Purpose of the invention]

The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, and an object of the present invention is to provide a method for installing equipment that can easily install equipment that needs to be isolated from the atmosphere. .

[Summary of the invention]

The present invention covers equipment that needs to be installed in isolation from the outside air with a non-breathable flexible synthetic resin membrane, and connects the bag-shaped opening of the synthetic resin membrane to the equipment access area of the container in which the +N'+ device is installed. After the inside of the synthetic resin membrane and the equipment exit part are replaced with gas, the inside of the synthetic resin membrane and the equipment exit part are communicated with each other, and the equipment is installed in the container.

[Embodiments of the invention]

A preferred embodiment of the present invention will be explained in detail with reference to FIGS. 3 to 6. It should be noted that parts corresponding to those explained in the above-mentioned prior art will be given the same reference numerals and their explanation will be omitted.

The pump 2z whose maintenance has been completed in Fig. 3 is
Contaminants adhering to the surface of the pump 2z have been removed, and there is no need to be careful about radiation exposure during pump installation work.

However, the installation of the pump 22 in the pump storage container 10 (not shown in Figure 2, Figure 3) requires airtightness in order to prevent radioactive substances from scattering and to prevent active sodium from coming into contact with the outside air. Therefore, the pump 22t is suspended from the transporter 30 via a pump hanging device 44 provided on the upper part of the pump, and then placed inside a non-breathable flexible synthetic resin membrane formed in a cylindrical shape, for example, a vinyl tube 46. inserted. Vinyl tube 4
6 is sufficiently longer than the length of the pump 22, and its upper end is connected to the pump 22 airtightly with adhesive tape or the like at the upper surface sealing portion 50 of the 7 flange 4B of the pump 22, and is formed into a plastic bag 52. Ru. This plastic bag 52 is provided with a hose 54 made of flexible synthetic resin, for example vinyl, for gas replacement near the upper end. The lower portion of the plastic bag 52 is double-sealed near the lower end of the pump 22 and at the lower end of the plastic bag 52 using threads 56, 58, etc., respectively.

After sealing the insertion part of the pump 22 into the pump storage container 10 in the plastic bag 52 as described above, the pump 22 is transferred to the glove box 16 by the conveyor 30 as shown in FIG.
move above. Then, the pump 2 is moved by the conveyor 30.
2 is gradually lowered, and the plastic bag 52 is connected to the clove box 16, which is the exit part of the equipment. That is, the string 58 sealing the lower end of the plastic bag 52 is disassembled, and the F end of the plastic bag 52 is connected to the sealing portion 62 of the guide v60 attached to the upper end of the glove box 16 using adhesive tape or the like.

When the connection between the plastic bag 52 and the glove box 16 is completed, the inside of the plastic bag 52 and the inside of the glove box 16 are replaced with argon gas or the like under the same conditions through the hose 54 and the nozzles 36, 38, etc. .

The pressure inside the plastic bag 52 and inside the glove box 16 after this gas replacement is set to be slightly higher than the pressure inside the pump storage container 10, so that when the partition plate 18 is opened, the contaminated gas inside the pump storage container is released into the glove box. 16 to prevent it from flowing into the interior.

After the gas 16 inside the plastic bag 52 and the glove box 16 has been completely removed, the hose 54 is sealed as shown in FIG. Let it escape. And the partition plate 18
is opened, and the pump 22f is gradually moved downward by the carrier 30, and the pump 22 is inserted into the pump storage device 10.

Other than this, the plastic bag 52 is adjusted so as to be located outside the glove box 16, as shown in FIG.

The pump installation work performed as described above eliminates the need for decontamination work inside the cask, which was required after the pump installation, and can reduce the radiation exposure of workers. Moreover, by making the plastic bags 5 and 2 transparent, visual inspection can be performed during pump installation work that requires high installation accuracy, and work efficiency can be improved. Additionally, there is no need to transport heavy items such as casks, making the work easier.

The plastic bag 52 has a double structure of an inner plastic bag 64 and an outer plastic bag 66 as shown in FIG.
By making the pressure inside the plastic bag 52 slightly lower than that of the outside air 20 and the inside of the plastic bag 52, damage to the plastic bag 52 can be easily discovered. That is, if the inner plastic bag 64 or the outer plastic bag 66 is damaged, argon gas or air flows into the space 68 and the space 68 expands, making it easy to detect and repair the damage to the plastic bag 62. can.

In the above example, vinyl was explained with a flexibility composite value of 1 fat, but the flexibility composite value (the fat may be a synthetic resin such as polyethylene, etc. Also, in the above example, the primary sodium I) l! Although I explained the installation of the pump in Section 1, it was only necessary to install equipment necessary for the operation of the reactor, such as fuel rods, control rods, and liquid level gauges.
It can be applied to the installation of equipment that needs to be installed without contaminating the air.

In order to remove the pump 22, the lower part of the plastic bag 52 is sealed after the pump 22 is pulled out above the cask 16, so that the pump 22 can be removed from the decontamination work area without contaminating the surrounding area. can be transported to

〔Effect of the invention〕

As explained above, according to the present invention, equipment that needs to be able to stand without contaminating the outside air is sealed in a non-ventilated soft synthetic 4i71 fat, and this non-soft synthetic □1lllJ fat and 12 ．． If you are lucky with money, such as the entrance and exit of the container where you can hold the dragon equipment,
By using iW, equipment can be easily installed.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of a conventional method for installing all the pumps, and FIG. 3 is a diagram showing a state in which the pump is housed in a vinyl enclosure according to an embodiment of the method for installing the pump according to the present invention. Fig. 4 is a diagram showing a plastic bag, glove box, and kepo in one unit according to an embodiment of the method for installing a 1gt machine according to the present invention, and Fig. 5 is a diagram according to an embodiment of the method for installing a 1gt machine according to the present invention. FIG. 6 is a partial sectional view of one embodiment of the plastic bag described in RJJL, which shows the pump installed in the pump storage container. DESCRIPTION OF SYMBOLS 10... Pump storage container, 16... Glove box, 22... Pump, 24... Cask, 32,3
4゜36.38,40.42...Nozzle, 50.62
...Seal IIs, 52...Plastic bag, 54...
・Small, 56.58...Thread, 64...Inner vinyl H, 66...Outer plastic bag. No. (I!1 No. 2: J1.3 No. 4 No. 5 Ward/8 No. 6

Claims (1)

[Scope of Claims] (1) A device installation method in which a device can be installed in a container that is isolated from the outside air, wherein at least the insertion portion of the device into the container is made of a flexible material with no air permeability. After it is sealed in a resin membrane and transported to the equipment exit section of the container, the bag-shaped opening of the synthetic resin membrane is connected to the equipment exit section of the container, and the interior of the synthetic resin arm and the four-charcoal machine inlet/output section are connected. 2. After directly exchanging the gas with the container, the synthetic resin connects the interior of the container with the equipment exit part, and the equipment is placed in the container. 2. 2. The equipment installation method according to claim 1, wherein the synthetic resin membrane is constructed with a double membrane, and the pressure in this gap is lower than that in the outside.