CN217640674U - Shielding device for overhauling in radioactive environment - Google Patents

Abstract

The utility model relates to a spent fuel aftertreatment field especially relates to a shield assembly that is used for radioactive environment to overhaul down. The shielding device is a shielding tool arranged outside the through-the-earth valve; the through-the-ground valve comprises a valve rod, a valve body, a valve head and a valve core from top to bottom; the top of the shielding tool is provided with an opening, and the bottom of the shielding tool is connected with a flange; two groups of top access holes are symmetrically arranged at the upper end of the side wall of the shielding tool by taking the valve rod as a symmetry axis, and the positions of the top access holes are aligned with the valve rod; the lower extreme of shielding frock lateral wall uses the valve rod to set up one and keeps in bag and a set of bottom access hole as symmetry axis symmetry, the position of bottom access hole and bag of keeping in is unanimous with the valve head level. The utility model discloses a shield assembly simple structure, the maintenance of the maintainer of being convenient for wear the ground valve, reduce radiation harm to the human body.

Description

A shielding device for maintenance in radioactive environment

technical field

The utility model relates to the field of spent fuel reprocessing, in particular to a shielding device used for maintenance in a radioactive environment.

Background technique

The ground-penetrating globe valve is a globe valve that passes through the radiation protection shielding layer through a transmission device. It is a special valve that operates under certain radiation levels and corrosive environmental conditions. It is an important equipment for controlling process media in spent fuel reprocessing plants. Because the penetrating valve is installed in the high radiation dose place, it is mainly distributed in the first maintenance hall, the second maintenance hall, and the process pump room. The environmental radiation level, aerosol content and surface pollution are high, and the maintenance is difficult.

In the previous maintenance process of the ground-penetrating valve, the ground-penetrating valve was in direct contact with the surrounding environment without any shielding measures. The maintenance personnel must wear gas masks to perform the maintenance of the ground-penetrating valve, which would cause great harm to the surrounding environment or human health.

Utility model content

The technical problem to be solved by the utility model is to provide a shielding device for maintenance in a radioactive environment, which has a simple structure, is convenient for maintenance personnel to maintain the ground penetrating valve, and reduces the harm of radiation to the human body.

The utility model provides a shielding device used for maintenance in a radioactive environment, which is a shielding tooling arranged outside a ground-penetrating valve;

The ground penetration valve includes a valve stem, a valve body, a valve head and a valve core from top to bottom;

The top of the shielding tooling is provided with an opening, and the bottom is connected to a flange; the upper end of the sidewall of the shielding tooling is symmetrically provided with two sets of top access holes with the valve stem as the axis of symmetry, and the positions of the top access holes are aligned with the valve stem; A temporary storage bag and a set of bottom inspection holes are symmetrically arranged on the lower end of the side wall of the shielding tool with the valve stem as the axis of symmetry, and the positions of the bottom inspection holes and the temporary storage bag are consistent with the level of the valve head.

Preferably, the vertical height of the top access hole and the bottom access hole is 1100mm.

Preferably, both the top access hole and the bottom access hole are externally connected with rubber gloves to form a closed space.

Preferably, the temporary storage bag is sized to accommodate the valve head.

Preferably, the size of the temporary storage bag is Ф200mm x 400mm.

Preferably, each group of the top access holes is two holes; each group of bottom access holes is two holes.

Preferably, the shielding tool is cylindrical.

Compared with the prior art, the shielding device of the present invention for maintenance in a radioactive environment has the following beneficial effects:

(1) It isolates the high-dose ground-penetrating valve from direct contact with the environment during maintenance to avoid direct environmental pollution;

(2) The shielding device forms a sealed state during maintenance, thereby reducing the pollution and exceeding the standard after maintenance by the maintenance personnel;

(3) It replaces the maintenance personnel with gas masks for maintenance, which improves the maintenance efficiency of the maintenance personnel;

(4) It can be used repeatedly, and it is easy to handle, and it is not easy to generate radioactive waste, which is more economical and more scientific.

Description of drawings

Fig. 1 shows the structural schematic diagram of the shielding device used for maintenance under the radioactive environment of the present invention;

In the figure,

1-shield tooling, 2-through valve, 3-valve stem, 4-valve body, 5-valve head, 6-spool, 7-top access hole, 8-temporary storage bag, 9-bottom access hole, 10 - Flange.

Detailed ways

In order to further understand the present utility model, the embodiments of the present utility model are described below in conjunction with the examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present utility model, rather than limit the present utility model.

The utility model device should have the following technical requirements:

(1) Each component of the device should have high strength, overall reliability and safety.

(2) All components should be rationally designed to facilitate on-site installation and use.

(3) During use, the shielding device should be convenient and easy to use, which can greatly improve the maintenance efficiency.

In the past, when the floor penetrating valve was repaired, the high-dose floor penetrating valve was exposed to the environment and caused contamination of the environment and personnel. In this design, the floor penetrating valve is wrapped in a certain closed space, so that the floor penetrating valve can be connected with the surrounding environment and maintenance. Personnel are isolated, so that the ultra-high aerosol cannot be leaked in the closed maintenance container all the time, and it does not affect the maintenance and operation of maintenance personnel, that is, a shielding tooling that is convenient to use and can be reused is designed.

The embodiment of the present utility model discloses a shielding device for maintenance in a radioactive environment. As shown in FIG. 1 , it is a shielding tool 1 arranged outside the ground penetrating valve 2 ; the shielding tool 1 covers the ground penetrating valve 2 , preferably, the shielding tooling 1 is cylindrical;

The ground penetration valve 1 includes a valve stem 3, a valve body 4, a valve head 5 and a valve core 6 from top to bottom;

The top of the shielding tooling 1 is provided with an opening, and the bottom is connected to a flange;

The upper end of the side wall of the shielding tool 1 is symmetrically provided with two sets of top access holes 7 with the valve stem as the axis of symmetry, and the positions of the top access holes 7 are aligned with the valve stem 3; A temporary storage bag 8 and a group of bottom access holes 9 are symmetrically arranged for the axis of symmetry, and the positions of the bottom access holes 9 and the temporary storage bag 8 are consistent with the level of the valve head 5 .

The top opening of the shielding tooling 1 is the connection hole of the crane lifting lug. When the crane lifting lug extends into the shielding tooling, the connection port and the crane suspension rod are sealed with adhesive tape.

The bottom of shielding tooling 1 is flange 10, which must be bolted to the embedded flange on the ground when used.

Both the top access hole and the bottom access hole are externally connected with rubber gloves to form a closed space, and the rubber gloves are used for maintenance during maintenance.

For ease of operation, each set of said top access holes is preferably two holes; each set of bottom access holes is two holes.

Preferably, the vertical height of the top access hole and the bottom access hole is 1100mm.

The temporary storage bag is sized to accommodate the valve head. The size of the temporary storage bag is Ф200mm x 400mm.

The specific workflow of using this device is as follows:

As shown in the picture, place the tool in the upper left corner or the upper right corner of the glove; put the spare parts that need to be replaced and the sealed bag into the temporary storage bag, and set aside the transparent tape of the required boom and shielding device;

Note: To overhaul the manual ground penetrating valve, only the valve head needs to be replaced, and the previous step of fixing can be omitted;

After removing the actuator, install the matching lifting ring (M16) screws;

Pass the lower end of the sealing device and the inner hole of the sealing flange, and use the compression sleeve to fasten the bolts to connect with the bolt holes on the ground, so as to achieve the effect of no leakage of aerosol;

Fold the ground penetrating valve sealing device to the ground, and make the M16 lifting lugs close to the upper port of the sealing device;

Extend the self-made extended hook into the upper end of the sealing device, connect it with the M16 lifting lug, and seal the upper end of the sealing device and the self-made hook with transparent tape to achieve the sealing effect as much as possible;

Connect the self-made hook with the double ten-ton crane hook and start lifting;

After lifting the ground penetrating valve completely out of the hole, slowly tilt the ground penetrating valve to the ground, and cover the hole with a cover to prevent tools from accidentally falling into the hole, and start maintenance;

During the maintenance process, the replaced valve head is put into the sealing bag that was placed in the temporary storage bag of the sealing device in advance.

The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present utility model, some improvements and modifications can also be made to the present utility model, and these improvements and modifications also fall into the protection of the claims of the present utility model. within the range.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A shielding device for overhauling in a radioactive environment is characterized in that the shielding device is a shielding tool arranged outside a through-the-earth valve;

the through-the-ground valve comprises a valve rod, a valve body, a valve head and a valve core from top to bottom;

the top of the shielding tool is provided with an opening, and the bottom of the shielding tool is connected with a flange; two groups of top access holes are symmetrically arranged at the upper end of the side wall of the shielding tool by taking the valve rod as a symmetry axis, and the positions of the top access holes are aligned with the valve rod; the lower extreme of shielding frock lateral wall uses the valve rod to set up one and keeps in bag and a set of bottom access hole as symmetry axis symmetry, the position of bottom access hole and bag of keeping in is unanimous with the valve head level.

2. The shielding apparatus for servicing in a radioactive environment of claim 1, wherein said top access opening is 1100mm from a vertical height of the bottom access opening.

3. The shielding device for radioactive environment service of claim 1, wherein the top and bottom service holes are externally connected with rubber gloves to form a closed space.

4. The shielding apparatus for radiological access according to claim 1, wherein said temporary storage bag is sized to receive a valve head.

5. The shielding device for overhauling in radioactive environment as recited in claim 4, wherein the size of the temporary storage bag is Φ 200mm x 400mm.

6. The shielding apparatus for servicing in a radioactive environment of claim 1, wherein each set of said top access openings is two openings; each group of bottom access holes is two holes.

7. The shielding apparatus for service in a radioactive environment according to claim 1, wherein said shielding tool is cylindrical.

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