CN217640674U

CN217640674U - Shielding device for overhauling in radioactive environment

Info

Publication number: CN217640674U
Application number: CN202220942157.6U
Authority: CN
Inventors: 高津宝; 石秀高; 何昌青; 田波; 王超; 胡俊; 关峪; 王荣
Original assignee: 404 Co Ltd China National Nuclear Corp
Current assignee: 404 Co Ltd China National Nuclear Corp
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-10-21
Anticipated expiration: 2032-04-22

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

Shielding device for overhauling in radioactive environment

Technical Field

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.

Background

The ground-penetrating stop valve is a stop valve which penetrates through a radiation protection shielding layer through a transmission device, is a special valve which operates under the conditions of certain radiation level and corrosive environment, and is important equipment for controlling process media in a spent fuel post-treatment plant. The through-the-ground valve is installed in a high radiation dosage place and is mainly distributed in a first overhaul hall, a second overhaul hall, a process pump room and the like. High environmental irradiation level, high aerosol content and surface pollution, and high difficulty in inspection and maintenance.

In the previous process of overhauling the through-the-ground valve, the through-the-ground valve is in direct contact with the ambient environment, no shielding measure is provided, and an overhauling person must wear an air mask to carry out the overhauling work of the through-the-ground valve, thereby causing great harm to the ambient environment and human health.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the shielding device for overhauling under the radioactive environment is simple in structure, and convenient for an overhauling person to overhaul the through-the-ground valve, so that the harm of radiation to a human body is reduced.

The utility model provides a shielding device for maintenance in radioactive environment, which 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.

Preferably, the top manhole is 1100mm apart from the bottom manhole vertical height.

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

Preferably, the staging bag is sized to receive the valve head.

Preferably, the size of the temporary storage bag is phi 200mm x 400mm.

Preferably, each set of said 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 utility model discloses a shielding device for overhauing under the radioactive environment has following beneficial effect:

(1) The high-dosage through-the-earth valve is isolated from directly contacting the environment during maintenance, so that direct environmental pollution is avoided;

(2) The shielding device forms a sealing state during maintenance, so that the phenomena of pollution and standard exceeding after maintenance by maintenance personnel are reduced;

(3) The maintenance of the maintenance personnel with the gas mask is replaced, and the maintenance efficiency of the maintenance personnel is improved;

(4) Can be repeatedly used, is convenient to treat, is not easy to generate radioactive waste, and is more economic and scientific.

Drawings

Fig. 1 shows a schematic structural view of the shielding device for radioactive environment maintenance of the present invention;

in the figure, the position of the upper end of the main shaft,

1-shielding tool, 2-through-the-earth valve, 3-valve rod, 4-valve body, 5-valve head, 6-valve core, 7-top access hole, 8-temporary storage bag, 9-bottom access hole and 10-flange.

Detailed Description

For further understanding of the present invention, embodiments of the present invention are described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the present invention.

The utility model discloses a device should possess following technical requirement:

(1) All parts of the device have high strength and high overall reliability and safety.

(2) Each part is designed reasonably, and is convenient for field installation and use.

(3) In the use, shield assembly should make things convenient for handy, can promote maintenance efficiency greatly.

In the past, when the through-the-ground valve is overhauled, the high-dosage through-the-ground valve is exposed in the environment to be overhauled to cause the pollution of the environment and personnel, the through-the-ground valve is wrapped in a certain closed space by the design, the through-the-ground valve is isolated from the surrounding environment and the maintainers, the ultrahigh aerosol of the through-the-ground valve cannot leak in a closed overhauling container all the time, the overhauling and operation of the maintainers are not influenced, and the shielding tool which is convenient to use and can be repeatedly used is designed.

The embodiment of the utility model discloses a shielding device for overhauling in radioactive environment, as shown in figure 1, it is a shielding tool 1 arranged outside a through-the-earth valve 2; the ground penetrating valve 2 is covered by a shielding tool 1, and preferably, the shielding tool 1 is cylindrical;

the through-the-ground valve 1 comprises a valve rod 3, a valve body 4, a valve head 5 and a valve core 6 from top to bottom;

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

two groups of top access holes 7 are symmetrically arranged at the upper end of the side wall of the shielding tool 1 by taking the valve rod as a symmetry axis, and the positions of the top access holes 7 are aligned with the valve rod 3; the lower extreme of 1 lateral wall of shielding frock uses the valve rod to set up one and keeps in bag 8 and a set of bottom access hole 9 as symmetry axis symmetry, bottom access hole 9 and the position of keeping in bag 8 are unanimous with 5 level of valve head.

The top of the shielding tool 1 is provided with a hole for connecting a crane lifting lug, and when the crane lifting lug extends into the shielding tool, the connecting port is sealed with the crane lifting rod by using adhesive tapes.

The bottom of the shielding tool 1 is provided with a flange 10, and the shielding tool is connected with a ground embedded flange through bolts during use.

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

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

The valve head can be installed to the size of the temporary storage bag. The size of the temporary storage bag is phi 200mm x 400mm.

The specific working flow of the device is as follows:

as shown, the tool is placed in the upper left or right hand glove; placing spare parts and sealing bags to be replaced into a temporary storage bag, and placing the needed suspender and the transparent adhesive tape of the shielding device on one side;

in the step of injection, the manual through-the-ground valve is maintained only by replacing the valve head, and the step of fixing can be omitted;

after the actuating mechanism is removed, a matched lifting ring (M16) screw is installed;

the lower end of the sealing device penetrates out of an inner hole of the sealing flange, and is connected with a ground bolt hole through a fastening bolt of a pressing sleeve, so that the aerosol does not leak;

folding the through-the-ground valve sealing device to the ground, and enabling the M16 lifting lug to approach an upper port of the sealing device;

extending the self-made lengthened lifting hook into the upper end of the sealing device, connecting the self-made lengthened lifting hook with the M16 lifting lug, and sealing the upper end of the sealing device and the self-made lifting hook by using a transparent adhesive tape to achieve a sealing effect as much as possible;

connecting a self-made lifting hook with a double ten-ton lifting hook, and starting lifting;

after the through-ground valve is completely lifted out of the hole, the through-ground valve is slowly inclined to the ground, the hole is covered by a cover plate, and tools are prevented from accidentally falling into the hole and starting to overhaul;

the valve head after the maintenance in-process is changed is packed into the sealing bag which is put in the temporary storage bag of the sealing device in advance, and the valve head is put back in the temporary storage bag after being packed, and is taken out after the valve head is put back in the temporary storage bag.

The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make 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 applied to 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

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;

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.