JP2905687B2 - Glove box with multiple panels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glove box for handling radioactive materials such as nuclear fuel materials and spent nuclear fuel in a sealed state.

[0002]

2. Description of the Related Art Conventionally, when handling radioactive materials such as nuclear fuel materials and spent nuclear fuel, the handling is performed in a sealed glove box so that workers are not exposed to radioactivity. .

[0003] Such a glove box is usually provided with stainless steel flooring, side plates, frames, gloves, glove ports, a transparent panel disposed at a predetermined position for observing the inside, and the like. ing.

FIG. 2 is a sectional view showing a main part of such a conventional glove box. In this glove box, a glove 21 for handling an object to be handled such as a radioactive substance inside is attached to a predetermined position of a container wall constituting a container (main body) 20. The glove 21 is made of a flexible material (for example, neoprene rubber or the like) so that the object to be handled inside can be reliably handled.

The glove 21 is hermetically attached to a cylindrical glove port 22 so as not to impair the airtightness of the inside of the container 20, and the portion of the vessel wall where the glove port 22 is provided is: A transparent panel made of a transparent material (for example, an acrylic resin plate with a thickness of 10 mm) so that an operator can handle the object while visually observing the inside.
23.

[0006] Each transparent panel 23 is fixed to a joining member (frame) 24 made of a channel material or the like by means of screws or stud bolts (not shown).
The glove port 22 and the transparent panel 23 are also air-tightly joined to each other, and are kept air-tight.

[0007]

However, in the above-mentioned conventional glove box, the scattered radioactive substance powder adheres to the transparent panel 23 or accumulates on the protrusions such as the glove port 22 and the joining member 24. As a result, fine cracks and physical scratches are generated on the surface of the transparent panel 23 due to radiation deterioration or the like, and the transparency is reduced. For this reason, it is difficult to visually check the inside of the glove box from the outside, and there is a problem that the work when handling the object to be handled from the outside via the glove 21 is hindered.

Further, when the deterioration of the transparent panel 23 further proceeds, there is a problem that the transparent panel 23 is damaged and the sealing property is impaired.

The present invention has been made to solve the above problems, and has a glove box capable of easily maintaining the transparency of the transparent panel, a deterioration of the transparent panel, and a transparency of the transparent panel. An object of the present invention is to provide a glove box capable of holding a glove.

[0010]

In order to achieve the above object, a glove box according to the present invention is characterized in that a radioactive substance such as a nuclear fuel substance and a spent nuclear fuel is sealed from the outside.
In a glove box that is handled through a glove made of a flexible material in a container partially made of a transparent panel, a multi-layer structure in which a portion formed of a transparent panel of the container is arranged by stacking a plurality of transparent panels. In addition, by adopting a structure that allows only the inner transparent panel to be removed or replaced, only the inner transparent panel can be removed when the transparency of the inner transparent panel is reduced due to radiation deterioration. In this case, the transparency of the multi-layered transparent panel as a whole is ensured by replacement, and the visibility from the outside is maintained.

[0011] In the multi-layered transparent panel, the outer transparent panel maintains airtightness, and the inner transparent panel has a disposition structure giving priority to ease of removal and replacement.

Further, in order to prevent the accumulation of radioactive material which causes radiation deterioration of the transparent panel, irregularities such as a joint between the innermost transparent panels and a joint between the innermost transparent panel and the glove port are prevented. The structure is characterized in that irregularities are hardly formed on the inner surface of the container by covering a portion which is likely to occur with a covering member.

[0013]

In the glove box of the present invention, since the portion composed of the transparent panels has a multiplex structure in which a plurality of transparent panels are arranged in an overlapping manner, radiation deterioration caused by attachment and deposition of radioactive substances, etc. Degradation mainly occurs on the inner transparent panel. Therefore, if the transparent panel becomes cloudy or physically scratched due to radiation deterioration, etc., it is necessary to remove or replace only the inner transparent panel to ensure the transparency of the multi-layered transparent panel as a whole. And visibility from the outside can be maintained. In addition, by removing only the inner transparent panel from the innermost one of the transparent panels having the multiplex structure, the transparency of the entire transparent panel can be efficiently secured over a long period of time.

In the multi-layered transparent panel, the outer transparent panel maintains the airtightness, and the inner transparent panel has an inner transparent panel with an arrangement structure giving priority to ease of removal and replacement. By easily removing or replacing the panel, it is possible to more efficiently secure the transparency of the entire transparent panel having the multiple structure.

[0015] Further, a glove box in which the joint between the innermost transparent panels and the joint between the innermost transparent panel and the glove port are covered with a covering member so as to prevent the inner surface of the container from being roughened. In the above, since the deposition of radioactive material is less likely to occur, and the occurrence of radiation deterioration and the like of the transparent panel is reduced, clouding and physical damage to the transparent panel are suppressed. Furthermore, since the transparent panel has a multiplex structure, even if the transparent panel becomes cloudy or physically scratched due to radiation deterioration, etc., only the inner transparent panel is removed or replaced, so that the multiplex structure The transparency of the entire transparent panel can be secured. Therefore, it is possible to increase the interval at which the inner transparent panel is removed or replaced, and efficiently maintain visibility from the outside.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a glove box having multiple panels according to one embodiment of the present invention.

In this glove box, a glove 1 for handling an object to be handled such as a radioactive substance is hermetically sealed in a glove port 2 provided at a predetermined position on a vessel wall constituting a container (main body) 10. Installed. The glove 1 is formed of a flexible material such as neoprene rubber, for example, so that the object to be handled inside can be reliably handled.

A transparent panel of a multi-layered structure made of a transparent material is provided around a portion (wall) of the container 10 where the glove port 2 is disposed, so that an operator can work inside while visually observing the inside. That is, one outer transparent panel 3
a (a 10 mm thick acrylic resin plate) and two inner transparent panels 3b ₁ and 3b ₂ (3 to 5 mm thick acrylic resin plate). The structure of the transparent panel (multiple structure)
The structure is not limited to the triple structure as in the case of this embodiment, but may be a double structure, or a multiple structure of a quadruple structure or more.

Then, the transparent panels 3a, 3b ₁ , 3b
₂ are hermetically joined to each other by fixing them with screws or stud bolts (not shown) via joining members 4 and 5 made of channel material or the like.

More specifically, the outer transparent panels 3a adjacent to each other use a joint member 4 and a plate-like joint member 5 each having a U-shaped cross section, and a screw or a stud bolt ( It is hermetically joined by tightening with (not shown). The joining between the container wall 10a constituting the container 10 and the outer transparent panel 3a is also performed by tightening screws or stud bolts (not shown) via the packing 7.

The inner transparent panels 3b ₁ and 3b ₂ are:
It is attached to the joining member 4 with screws or stud bolts (not shown) via a flat frame plate (covering member) 8, and a rubber ring having a thickness of 1 to 2 mm is provided near the glove port 2. It is arranged by attaching to the glove port 2 via the sheet (covering member) 9 of the above.

The glove port 2 is hermetically mounted by sandwiching the outer transparent panel 3a between the glove port 2 and the flange 12 via the packing 7.

Further, the inner transparent panels 3b ₁ and 3b ₂ are attached to the vessel wall 10a constituting the container 10 by screws or stud bolts (not shown) via a flat frame plate (covering member) 11. It is done by occupying.

[0024] Note that the frame plate (cover member) 8, 11 and a ring-shaped seat (covering member) 9, joint and if the transparent panel 3b ₁ of the innermost of the container 10, the transparent panel 3b ₁ innermost a junction between the wall 10a of the container 10, and the inner and joint portion of the transparent panel 3b ₁ and the glove port 2 to cover, irregularities which radioactive material is deposited which is a factor leading to such radiation degradation of the transparent panel It has the function of preventing it from being formed.

That is, in the glove box having multiple panels according to this embodiment, of the transparent panels 3a, 3b ₁ and 3b ₂ having multiple structures, the outer transparent panel 3a is configured to maintain the airtightness, and the inner panel is provided with the inner panel. The transparent panels 3b ₁ and 3b ₂ have a structure that emphasizes the ease of removal and replacement, and are used at the junction between the innermost transparent panels 3b ₁ and the junction between the transparent panel 3b ₁ and the glove port. The treatment is performed so that no unevenness is formed.

[0026] Thus, in this glove box, hardly occurs deposition of radioactive material, the outer and inner transparent panel 3a, among 3b _1, 3b _2, in particular cloudy or physical scratches on the transparent panel 3b ₁ of the inner together be generated is suppressed, since the transparent panel 3a, 3b _1, 3b ₂ is a multiple structure, e.g., due to radiation degradation, cause clouding or physical scratches on the transparent panel 3b ₁ of the innermost even if, by removing the transparent panel 3b ₁ of the innermost, it is possible to easily restore the transparency of the overall transparent panel of multiple structure.

As described above, in the glove box of the above-described embodiment, the interval between the removal and replacement of the inner transparent panels 3b ₁ and 3b ₂ can be made longer to maintain the visibility from the outside efficiently. As it becomes possible,
Even if the transparent panel 3b ₁ of the inner, 3b ₂ in cloudy or physical wound occurs, and removed only inside the transparent panel 3b _1, 3b _2, by replacing or transparent panel of readily multiple structure Transparency as a whole can be restored, and visibility from the outside can be maintained.

It should be noted that the present invention is not limited to the above-described embodiment, and has a specific configuration of a multiplex structure including an outer transparent panel and an inner transparent panel, and the formation of irregularities on the inner surface of the container. Various applications and modifications can be made to the specific configuration for prevention, the connection structure between the glove port and the glove, and the like without departing from the gist of the invention.

Further, the present invention is not limited to a glove box for handling radioactive substances, but can also be applied to a glove box for handling substances such as poisonous substances and deleterious substances which should be handled tightly so as not to be scattered. .

[0030]

As described above, the glove box of the present invention has a multi-layer structure in which the transparent panel of the container is formed by stacking a plurality of transparent panels, and only the inner transparent panel is provided. By adopting a structure that can be removed and replaced, if the transparency of the inner transparent panel decreases due to radiation deterioration, etc., only the inner transparent panel is removed or replaced, and the multi-layer transparent Since the transparency of the entire panel is secured and the visibility from the outside is maintained, if the transparent panel becomes cloudy or physically scratched due to radiation deterioration, only the inner transparent panel can be removed. By replacing the transparent panel, the transparency of the entire transparent panel having a multi-layer structure can be secured, and visibility from the outside can be maintained. In addition, by removing only the inner transparent panel from the innermost one of the transparent panels having a multiplex structure, the transparency of the entire transparent panel can be efficiently secured over a long period of time.

Of the multi-layered transparent panels, the outer transparent panel maintains airtightness, and the inner transparent panel has an inner transparent panel with an arrangement structure giving priority to ease of removal and replacement. The panel can be easily removed or replaced, and the transparency of the entire transparent panel having a multiple structure can be more efficiently secured.

Further, the joint between the transparent panels on the inner surface of the container and the joint between the transparent panel and the glove port are covered with a covering member so as to prevent the inner surface of the container from being formed with irregularities. It is possible to suppress the occurrence of radiation deterioration during the operation. Therefore,
It is possible to increase the interval at which the inner transparent panel is removed or replaced, and more efficiently maintain visibility from the outside.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a glove box having a multiplex panel according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a conventional glove box.

[Explanation of symbols]

1 Glove 2 glove ports 3a transparent panel 3b ₁ of the outer, 3b ₂ inside the transparent panel 4, 5 bonding member 7 packing 8, 11 frame plate (cover member) 9 ring-shaped sheet (covering member) 10 container (main body) 10a Container wall 12 flange

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-66995 (JP, A) JP-A 1-156500 (JP, U) JP-A 57-153300 (JP, U) (58) Investigation Field (Int.Cl. ⁶ , DB name) B25J 21/02 G21F 7/03

Claims (3)

(57) [Claims] 1. A glove box for handling a radioactive material such as a nuclear fuel material or a spent nuclear fuel through a glove made of a flexible material in a container partially sealed from the outside and made of a transparent panel, The part composed of the transparent panels of the container has a multi-layered structure in which multiple transparent panels are arranged one on top of the other, and has a structure in which only the inner transparent panel can be removed or replaced. When the transparency of the inner transparent panel decreases due to deterioration, etc., only the inner transparent panel is removed or replaced to secure the transparency of the entire transparent panel with multiple structures and maintain visibility from the outside A glove box having multiple panels, characterized in that: 2. An air-tightness is maintained by an outer transparent panel of the multi-layered transparent panel, and an inner transparent panel is arranged so as to give priority to easy removal and replacement. A glove box having the multiple panel according to claim 1. 3. An uneven surface such as a joint between the innermost transparent panels and a joint between the innermost transparent panel and the glove port so as to prevent the deposition of radioactive material that causes radiation deterioration of the transparent panel. The glove box having a multi-panel according to claim 1 or 2, wherein a portion which is likely to be formed is covered with a covering member so that unevenness is hardly formed on an inner surface of the container.