JPH08189985A - Reactor shield wall - Google Patents

Abstract

PURPOSE: To facilitate opening/closing work of an opening by providing a hollow plug container placed inside a shield wall body so as to extend in the horizontal direction of the opening, a pair of moving plugs which is formed of a radiation shielding material and move between the opening and the plug container, and a radiation shielding material. CONSTITUTION: When the closure of an opening 23 is relieved for periodical inspection of a vessel 1, each of moving plugs 29 in the left and right formed of a radiation shielding material 31 is horizontally moved toward a club container part 24 and the plug 29 is contained in the container part 24 to open the opening 23. Then the heat insulating material 21 of piping 10 is removed, an inspection robot is loaded to perform inspection and cleaning. After completion of the inspection and cleaning, heat insulating material 21 is mounted on the piping 10, the left and right plugs 29 contained in the container part 24 are moved toward the opening 23, and the opening 23 is closed by the plugs 29. Therefore, the plugs 29 do not project to outside nor inside of the shield body 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor shield wall provided in a reactor containment facility.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a reactor containment facility. Reference numeral 1 is a reactor pressure vessel, 2 is a reinforced concrete reactor vessel main body having a steel plate liner, and the reactor pressure vessel 1 is The reactor pressure vessel 1 is supported by a cylindrical pedestal 3 provided upright inside the reactor containment body 2.
A control rod drive mechanism (not shown) and the like are installed in the lower dry well 4 surrounded by the pedestal 3 below.

In addition, inside the reactor containment body 2,
A diaphragm 5 extending substantially horizontally from the inner wall of the reactor containment body 2 to the upper end of the pedestal 3 is integrally provided, and the inner wall of the reactor containment body 2 below the diaphragm 5 and the outer peripheral surface of the pedestal 3 are provided. Water 7 is stored in the suppression chamber 6 between the diaphragm 5 and the diaphragm 5.
Various equipment (not shown) is installed in the upper dry well 8 surrounded by the inner wall of the reactor containment body 2 above.

Further, a shield wall body 9 is provided at an upper end portion of the pedestal 3 so as to circumferentially surround the vicinity of the core portion of the reactor pressure vessel 1. The shield wall body 9 allows the reactor pressure to be increased. Radiation emitted from the core of the container 1 to the upper dry well 8 is shielded.

The pipe 10 such as a main steam pipe connected to the reactor pressure vessel 1 is connected to an external device (not shown) of the reactor containment vessel main body 2 through the upper dry well 8 and therefore shielded. In order to insert the pipe 10 into the wall body 9,
Opening 1 penetrating the shield wall body 9 substantially horizontally in its radial direction
1 is provided.

A shield plug device as shown in FIGS. 7 and 8 is provided in the opening 11.

Reference numeral 12 denotes a pair of right and left steel plugs (γ-ray shielding plugs). The steel plugs 12 have a mortar-shaped cross section 13 which can be fitted onto the pipe 10 covered with the heat insulating material 21. Are formed so that they can be fitted into the opening 11 so as to be located on the left side and the right side of the pipe 10.

In the state where the steel plug 12 is fitted into the opening 11, the upper and lower parts on the left side of the outer surface of the steel plug 12 located on the left side when viewed from the outside of the shield wall body 9 and the outside of the shield wall body 9. Steel plug 1 located on the right side when viewed from
Arms 14 are fixed to the upper and lower portions on the right side of the outer surface of the armature 2.

Further, support shafts 16 extending substantially vertically are provided near the left and right edges of the opening 11 as seen from the outside of the shield wall body 9 via the bracket 15 to the outside of the shield wall body 9. It is pivoted on the side.

Further, the arms 14 of the left and right steel plugs 12
Are fixed to the left and right support shafts 16, and the pair of steel plugs 12 provided in the opening 11 can be opened and closed like the double doors about the support shafts 16 respectively.

Reference numeral 17 denotes a pair of upper and lower steel plugs (gamma ray shielding plugs). The steel plugs 17 are made of both steels of the opening 11 before the steel plug 12 is fitted into the opening 11. Between the parts where the plug 12 is to be fitted, the pipe 1
It is adapted to be fitted from the outside of the shielding wall main body 9 so as to be positioned above and below 0.

Reference numeral 18 denotes a pair of left and right concrete plugs (neutron ray shielding plugs). The concrete plugs 18 are located on the left and right sides of the pipe 10 from the inside of the shielding wall body 9 to the opening 11. It is formed into a shape that can be fitted into.

Reference numeral 19 denotes a pair of upper and lower concrete plugs (neutron ray shielding plugs). The concrete plugs 19 are made of concrete of both openings 11 before the concrete plug 18 is fitted into the opening 11. The plug 18 is fitted from the outside of the shielding wall main body 9 so as to be located above and below the pipe 10 between the parts to be fitted.

The above-mentioned opening 11 is normally closed by the steel plugs 12 and 17 and the concrete plugs 18 and 19. However, when the reactor pressure vessel 1 is regularly inspected, the opening 11 is opened. When releasing the closing of 11, the both steel plugs 12 are opened around the support shaft 16, and then the steel plug 17 and the concrete plug 19 are
Carry out from the opening 11 to the outside of the shielding wall body 9, and then
The concrete plug 18 is temporarily placed on the workbench 20 provided inside the shield wall body 9 through the opening 11.

Further, the heat insulating material 21 covering the pipe 10
, And an inspection robot (not shown) is attached to the pipe 10, and the pipe 10 is subjected to ultrasonic flaw detection or X-ray inspection.
Conduct non-destructive inspection such as line transmission inspection and cleaning.

[0016]

However, since the conventional shield plug device has a structure in which the steel plug 12 opens and closes like a double door, the shield wall body 9 of the upper dry well 8 (see FIG. 6) is not provided. Devices and the like cannot be installed near the opening 11, that is, within the turning radius of the steel plug 12.

When the opening 11 is opened, the concrete plug 18 is temporarily placed on the workbench 20, so that the concrete plug 18 hinders the passage of the shield wall body 9 inward. Together with the steel plug 17 and the concrete plugs 18 and 19 for the opening 11.
It is not easy to attach and detach.

The present invention has been made in view of the above circumstances, and provides a reactor shield wall that improves the degree of freedom in the arrangement of equipment outside the shield wall body and does not hinder the passage inside the shield wall body. The purpose is to do.

[0019]

In order to achieve the above object, in the reactor shield wall of the present invention, a shield wall main body 22 erected so as to surround the reactor pressure vessel 1 and a reactor pressure vessel 1 are provided. An opening 23 provided in the shielding wall main body 22 so that the connected pipe 10 penetrates, a hollow plug storage portion 24 provided inside the shielding wall main body 22 so as to be continuous to the left and right of the opening 23, and radiation. And a pair of moving plugs 29 formed by a member for shielding radiation and arranged so as to be movable between the opening portion 23 and the plug housing portion 24, and each of the shielding wall main body 22 formed by a member for shielding radiation. Radiation shielding members 34 and 35 attached to a portion corresponding to the plug housing portion 24, and a semi-circular cutout 32 corresponding to the shape of the pipe 10 is provided in each moving plug 29.
Are provided at the ends facing each other.

A moving plug 29 is formed by a γ-ray shielding plug 30 made of a member for shielding γ-rays and a neutron ray shielding plug 31 made of a member for shielding neutron rays. Neutron beam shielding plug 31
And are separately or integrally configured so as to be movable between the opening 23 and the plug housing 24.

[0021]

In the nuclear reactor shield wall of the present invention, when the opening 23 is opened, the left and right moving plugs 29 that close the opening 23 are horizontally moved toward the plug housing 24. The movable plug 29 is housed in each plug housing 24 to open the opening 23.

On the other hand, when closing the opening 23, the left and right moving plugs 29 housed in the respective plug housings 24.
Is horizontally moved toward the opening 23, and the opening 23 is closed by each moving plug 29.

The moving plug 29 is replaced with the γ-ray shielding plug 30.
And the neutron ray shielding plug 31, the gamma ray shielding plug 30 and the neutron ray shielding plug 31
And are moved separately or integrally to open or close the opening 23.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of a reactor shield wall of the present invention, in which the same reference numerals as those in FIGS. 6 to 8 represent the same parts. .

Reference numeral 22 denotes a shield wall body, and the shield wall body 2
2 is composed of a steel hollow structure 22a that surrounds the vicinity of the core of the reactor pressure vessel 1 in the circumferential direction, and concrete 22b as a radiation shielding material that is filled throughout the inside of the steel hollow structure 22a. The workbench 20 is provided inside the shielding wall body 22 (see FIGS. 1 and 3, etc.).

In order to insert the pipe 10 connected to the reactor pressure vessel 1 into a predetermined portion of the shielding wall body 22,
An opening 23 having a rectangular shape when viewed from the outside of the shielding wall body 22 and penetrating the shielding wall body 22 substantially horizontally, and formed inside the shielding wall body 22 so as to be continuous to the left and right of the opening 23. And a hollow plug storage portion 24 are provided,
The pipe 10 is located substantially at the center of the opening 23 (FIG. 1).
And FIG. 2 etc.).

The steel plate forming the outer portion of the steel hollow structure 22a has a stopper 25 formed at the upper edge of the front edge of the opening 23 so as to project slightly downward (see FIG. 3).

A pair of guide rails 27 extending substantially horizontally from the center of the opening 23 toward the respective plug housings 24 are laid on the bottoms 26 of the openings 23 and the plug housings 24.

The guide rail 27 is provided with rollers 28 projecting on the upper surface at predetermined intervals (see FIG. 4).

Reference numeral 29 is a pair of left and right moving plugs, and the moving plug 29 is a steel plug (γ-ray shielding plug) 30.
On one surface, a concrete plug (neutron ray shielding plug) 31 having a steel sheet outer skin is provided (see FIGS. 1 and 3 and the like).

The moving plug 29 may have a structure in which a steel plug 30 and a concrete plug 31 are integrally fixed, or the steel plug 30 and the concrete plug 31 may not be fixed to each other. Each may be a separate body.

When viewed from the front side, the above-mentioned movable plug 29 has a semicircular cutout 32 corresponding to the pipe 10 covered with the heat insulating material 21, and can surround the pipe 10 and close the opening 23. It is formed in a shape (see FIG. 2).

Grooves that match the guide rails 27 are provided on the lower surfaces of the steel plugs 30 and the concrete plugs 31, and each moving plug 29 has a groove that fits into the guide rails 27. It is arranged so that it can move between the opening 23 and the plug housing 24 like a double door.

That is, in FIGS. 1 and 2, the movable plug 29 on the right side is positioned so as to close the opening 23, and the movable plug 29 on the left side is positioned so as to be substantially accommodated in the plug accommodating portion 24. In addition, since both moving plugs 29 are located in the opening 23, the shielding of the opening 23 is maintained.

Further, as described above, the steel plug 30
In the case where the steel plug 30 and the concrete plug 31 are separated from each other without being fixed to each other, the steel plug 30 and the concrete plug 31 can be moved separately, so that the opening 23 is opened. And the effort required to close it is reduced.

Further, at the top 36 of the opening 23,
A stopper 33 extending in the same direction as the guide rail 27 is fixed, and the stopper 33 and the guide rail 27 allow the moving plug 29 to move from the opening 23 to the shield wall body 22.
In addition, the stopper 25 and the guide rail 27 prevent the moving plug 29 from coming off from the opening 23 to the outside of the shielding wall body 22. The guide rail 27 also serves as a stopper against the pressure rising load of the annulus portion (the space inside the shield wall body 22) (see FIG. 3 and the like).

Reference numeral 37 denotes a handle. The handle 37 is fixed to the front surface of the steel plug 30 constituting each moving plug 29, and serves as a stopper for preventing the moving plug 29 from being drawn too far into the plug housing 24. It also has a role (see Fig. 1 etc.).

Reference numeral 34 is a neutron ray shielding member such as RX277, and 35 is a lead plate (γ ray shielding member). The neutron ray shielding member 34 and the lead plate 35 are the movable plug 2 described above.
9 are attached to the inner wall of each plug housing 24 of the steel hollow structure 22a so as not to prevent the entry of the plug 9 into the plug housing 24. The neutron beam shielding member 34 and the lead plate 35, the plug storage portion 24
The shield is kept (see Fig. 1).

The lead plate 35 may be attached to the portion corresponding to the back surface of each plug housing portion 24 of the steel hollow structure 22a as shown in FIG.

The operation of this embodiment will be described below.

When performing the periodic inspection of the reactor pressure vessel 1, the opening 2 is released when the opening 23 is unclosed.
Each of the left and right moving plugs 29 that closes 3,
The plug 23 is horizontally moved toward the plug housing 24, the moving plug 29 is housed in each plug housing 24, and the opening 23 is opened.

Next, the heat insulating material 2 covering the pipe 10
1 is removed, an inspection robot (not shown) is attached to the pipe 10, and the pipe 10 is subjected to nondestructive inspection such as ultrasonic flaw detection or X-ray transmission inspection and cleaning.

When the nondestructive inspection and cleaning of the pipe 10 are completed, the heat insulating material 21 is attached to the pipe 10, and further,
The left and right moving plugs 29 housed in the respective plug housings 24 are horizontally moved toward the opening 23,
Is closed by each transfer plug 29.

As described above, in this embodiment, when the opening 23 is opened, the moving plug 29 does not project to the outside or the inside of the shield wall body 22, so that the device near the shield wall body 22 is not affected. The degree of freedom of arrangement is improved, and the passage of the shielding wall body 22 inside is not obstructed.

Further, since it is not necessary to remove various members when opening or closing the opening 23, the opening and closing work of the opening 23 can be easily performed in a short time.

The reactor shield wall of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the present invention.

[0048]

As described above, the reactor shielding wall of the present invention can exhibit various excellent effects as described below.

(1) In any of the reactor shield walls described in claims 1 and 2 of the present invention, the moving plug 2 is used.
Since the opening 23 provided in the shielding wall main body 22 is opened or closed by horizontally moving 9, the opening 2
It is not necessary to remove various members when opening or closing 3, and the opening and closing work of the opening 23 can be easily performed in a short time.

(2) In any of the nuclear reactor shield walls according to claims 1 and 2 of the present invention, when the opening 23 is opened, the moving plug 29 also extends outside the shield wall body 22. Since it does not protrude inward, the degree of freedom in arranging devices near the shielding wall body 22 is improved, and the passage inside the shielding wall body 22 is not hindered.

(3) In the nuclear reactor shield wall according to claim 2 of the present invention, a γ-ray shielding plug 30 made of a member for shielding γ-rays and a neutron ray shielding plug made of a member for shielding neutron rays. Since 31 and 31 can be moved separately, the work required to open and close the opening 23 is reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a nuclear reactor shield wall of the present invention.

FIG. 2 is a view (partially cut front view) taken along the line II-II of FIG.

3 is a view (partially cut side view) taken along the line III-III in FIG.

FIG. 4 is a partially cutaway perspective view of the guide rail shown in FIGS. 1 to 3;

FIG. 5 is a partially cutaway plan view showing another example of the mounting structure of the radiation shielding member to the plug housing.

FIG. 6 is a vertical sectional view showing an example of a reactor containment facility.

FIG. 7 is a partially cut plan view showing an example of a conventional reactor shield wall.

8 is a VIII-VIII arrow view (partially cut front view) of FIG. 7. FIG.

[Explanation of symbols]

 1 Reactor Pressure Vessel 10 Piping 22 Shield Wall Main Body 23 Opening 24 Plug Storage 29 Moving Plug 30 Gamma Ray Shielding Plug (Steel Plug) 31 Neutron Ray Shielding Plug (Concrete Plug) 32 Notch 34 34 Neutron Ray Shielding Material 35 Lead plate

Claims (2)

[Claims] 1. A shield wall body (22) erected so as to surround the reactor pressure vessel (1), and a reactor pressure vessel (1).
An opening (23) provided in the shielding wall main body (22) so that the pipe (10) connected to the same penetrates, and the opening (23)
A hollow plug accommodating portion (24) provided inside the shielding wall body (22) so as to be continuous to the left and right of the opening, an opening (23) and a plug accommodating portion (24) formed by a member that shields radiation. A pair of moving plugs (29) arranged so as to be movable between them, and a plug housing (2) of the shielding wall body (22) formed by a member that shields radiation.
4) and a radiation shielding member (34) (35) attached to a portion corresponding to 4), and a semi-circular cutout portion (32) corresponding to the shape of the pipe (10) is provided in each moving plug (2).
9) A nuclear reactor shield wall, which is provided at opposite ends of each other. 2. The moving plug (29) is formed by a γ-ray shielding plug (30) made of a member for shielding γ-rays and a neutron ray shielding plug (31) made of a member for shielding neutron rays, The gamma ray shielding plug (30) and the neutron ray shielding plug (31) are separately provided in the opening (2).
The reactor shield wall according to claim 1, wherein the shield wall is configured to be movable between the plug 3 (3) and the plug housing (24).