JP7369682B2 - Blowout panel opening device - Google Patents

Description

The present disclosure relates to a blowout panel opening device.

Nuclear reactor buildings have openings several meters square in order to release internal pressure in emergencies. This opening is normally closed with a member called a blowout panel (see Patent Document 1 below). In the event of an emergency, it is possible to release the internal pressure through the opening by opening the blowout panel.

In order to reliably open such a blowout panel, an opening device may be provided at the opening.

Patent No. 6603000

In the above case, it is desirable to provide the opening with an opening device and to ensure that the opening area is as large as possible so as not to hinder the release of the internal pressure of the building.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide a blowout panel opening device that can secure a large opening area.

In order to solve the above problems, a blowout panel opening device according to the present disclosure is a blowout panel opening device that closes an opening formed in a wall of a nuclear reactor building. a drive unit located on the inside in a region overlapping with the opening when viewed from the front and capable of pressing the blowout panel toward the outside of the opening; and the opening on the inside of the reactor building. and a support mechanism having a proximal end portion fixed to a portion separated from the drive portion, and a distal end portion that supports the drive portion.

According to the present disclosure, it is possible to provide a blowout panel opening device that can ensure a large opening area of the opening.

FIG. 1 is a schematic diagram showing the configuration of a nuclear reactor building according to an embodiment of the present disclosure. FIG. 2 is a view of an opening, a blowout panel, and an opening device according to an embodiment of the present disclosure, viewed from inside a nuclear reactor building. 3 is a sectional view taken along line III-III in FIG. 2. FIG. FIG. 7 is a diagram showing a first modification example of the support mechanism according to the embodiment of the present disclosure. FIG. 7 is a diagram showing a second modification example of the support mechanism according to the embodiment of the present disclosure. FIG. 7 is a diagram showing a third modification example of the support mechanism according to the embodiment of the present disclosure.

(Composition of reactor building)
Hereinafter, a blowout panel opening device 90 (hereinafter simply referred to as "opening device 90") according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, a nuclear reactor building 1 is a box-shaped structure that houses a nuclear reactor inside. An opening H is formed in the side wall 1S of the reactor building 1 to release internal pressure in the event of an emergency. As an example, the opening H has a rectangular shape of 4 m square. Although FIG. 1 shows an example in which only one opening H is formed, the number of openings H may be two or more. This opening H is normally closed by the blowout panel 2. The blowout panel is held in the opening H by a clip (not shown).

Opening devices 90 are provided at each of the four corners of the blowout panel 2. The opening device 90 is a device for pressing the blowout panel 2 to remove it from the opening H (that is, opening the opening H). As an example, each opening device 90 is arranged along a pair of edges of the opening H extending in the vertical direction. In the following description, the outside of the reactor building 1 with respect to the opening H is simply referred to as the "outside", and the opposite side is simply referred to as the "inside". Further, the direction connecting the outside and the inside (that is, the opening direction of the opening H when the side wall 1S is viewed from the front) is referred to as the "inside and outside direction."

Although not shown in detail, on the outside of the side wall 1S and near the opening H, there is a closing device for closing the opening H again after the blowout panel 2 is detached and the opening H is opened. is provided. The closing device has a shutter shape, for example, and is capable of closing the opening H by being deployed along the side wall 1S.

Next, the configurations of the opening H, the blowout panel 2, and the opening device 90 will be described in detail with reference to FIGS. 2 and 3.

(Configuration of opening)
As shown in FIG. 2, the reactor building 1 further includes a columnar cross beam 1A extending in the horizontal direction, a plurality of vertical beams 1B extending in the vertical direction, and a wall portion 1W. The plurality of vertical beams 1B are arranged at intervals in the horizontal direction. The wall portion 1W has a plate shape that connects the vertical beams 1B. In the example of FIG. 2, one cross beam 1A extends above the opening H. These horizontal beams 1A, vertical beams 1B, and wall portions 1W are integrally constructed of, for example, reinforced concrete.

The opening H is formed on the wall 1W. The opening H has a pair of vertical edges 2A extending in the vertical direction and a pair of lateral edges 2B extending in the horizontal direction, so that the opening H has an overall rectangular shape. Inside this opening H, a rectangular annular frame 1R is attached. The blowout panel 2 is held by a clip (not shown) with respect to the frame 1R.

(Blowout panel configuration)
The blowout panel 2 is a rectangular plate member that closes the opening H described above. The blowout panel 2 includes a plate-shaped panel main body 2H and a reinforcing member 2R provided on an inwardly facing surface of the panel main body 2H. The reinforcing material 2R is provided to supplement the strength of the panel body 2H. The reinforcing members 2R protrude inward from the panel main body 2H and are arranged in a grid pattern by extending vertically and horizontally.

(Configuration of opening device)
The opening device 90 is fixed on the inwardly facing surface of the longitudinal beam 1B. In this embodiment, two opening devices 90 are arranged at intervals in the vertical direction on one longitudinal beam 1B. The opening device 90 extends horizontally from the vertical edge 2A of the opening H toward the opening H. The opening device 90 includes a support mechanism 3 and a drive section 4.

The support mechanism 3 is provided to support a drive unit 4 (described later) in the vicinity of the opening H (that is, in a portion away from the opening H). The support mechanism 3 includes a base plate 31, a proximal end 32, a distal end 33, and a shim S. The base plate 31 has a plate shape and is fixed by bolts (not shown) in surface contact with the vertical beam 1B. Note that it is desirable that the inner diameter of the bolt insertion hole formed in the base plate 31 be set larger than the outer diameter of the bolt. This makes it possible to precisely adjust the position of the opening device 90 in the vertical direction.

The base end portion 32 has a columnar shape that extends horizontally from the inwardly facing surface of the base plate 31 toward the opening H. The base end portion 32 is fixed to the base plate 31 by welding or the like. As shown in FIG. 3, the base end portion 32 includes a columnar base end main body 32H and a first flange 32F provided at the end of the base end main body 32H on the opening H side. There is. The first flange 32F extends in a plane perpendicular to the direction in which the base end main body 32H extends.

The distal end portion 33 extends from the end of the proximal end portion 32 toward the opening H side. The tip portion 33 is provided to hold the drive unit 4. The tip portion 33 has a second flange 33F, a first portion 33A, and a second portion 33B. The second flange 33F faces the first flange 32F via a shim S, and is removably fixed by bolts (not shown). That is, like the first flange 32F, the second flange 33F also extends in a plane orthogonal to the horizontal direction. The shim S is a plate-shaped member provided to adjust the distance between the first flange 32F and the second flange 33F. By preparing a plurality of types of shims S having different thicknesses, it is possible to adjust the distance between the first flange 32F and the second flange 33F to a desired value.

The first portion 33A has a columnar shape extending in the direction toward the opening H from the second flange 33F. The second portion 33B extends outward from the end of the first portion 33A on the opening H side. In other words, the second portion 33B intersects the first portion 33A at right angles when viewed from above and below. The outer end of the second portion 33B faces the wall portion 1W with a gap in the inner and outer directions. Further, the second portion 33B is arranged at a position overlapping the frame 1R in the horizontal direction.

The drive unit 4 is fixed on the end face of the second portion 33B facing the opening H side. Although not shown in detail, the drive portion 4 is fixed to the second portion 33B with bolts. The hole through which this bolt is inserted is an elongated hole whose long axis extends in the inner and outer directions in order to achieve precise positioning of the drive unit 4. The drive unit 4 applies an outward pressing force to the blowout panel 2. Specifically, as the drive unit 4, an air cylinder having a rod 4R that moves forward and backward in the inward and outward directions by air pressure, and a housing 4H that accommodates the rod 4R and the cylinder is preferably used. Note that it is also possible to use a hydraulic cylinder or an electric actuator as the drive unit 4.

The tip of the rod 4R can come into contact with the inner surface 2S of the blowout panel 2. In other words, the drive section 4 is provided at a position overlapping the opening H when viewed from the inside and outside directions. In other words, the dimensions of each part of the support mechanism 3 are adjusted so that the driving part 4 is located at a position overlapping the opening H.

Further, in this embodiment, only this drive portion 4 of the opening device 90 is exposed within the opening H. That is, the support mechanism 3 is not exposed to the opening H when viewed from the inside and outside directions. (Depending on the design and specifications, it is also possible to adopt a configuration in which part of the support mechanism 3 is exposed within the opening H.) Furthermore, as shown in FIG. 2 again, the drive unit 4 (rod 4R) is provided at a position where it can press only the reinforcing material 2R of the blowout panel 2. In other words, the pressing force by the rod 4R does not reach the panel body 2H.

(effect)
Next, the operation of the opening device 90 described above will be explained with reference to FIG. 3. In the event of an emergency, the internal pressure of the reactor building 1 may increase. In this case, first, the blowout panel 2 is detached from the opening H toward the outside due to the internal pressure itself, and the opening H is opened. This makes it possible to release internal pressure.

On the other hand, consider cases where the blowout panel 2 does not come off due to internal pressure alone for some reason, or cases where you want to open the blowout panel 2 even though the internal pressure is not that high, such as when you want to use the opening for water injection. It will be done. In preparation for such a case, an opening device 90 according to this embodiment is provided. When operating the opening device 90, the drive unit 4 is driven by an electrical signal transmitted from a remote location. As a result, the rods 4R of the four drive units 4 advance outward. As a result, the blowout panel 2 is pressed outward and detached from the opening H. As the blowout panel 2 is removed, the internal pressure of the reactor building 1 is released from the opening H. Even if the internal pressure has not increased to that extent, the opening can be used for purposes such as water injection by detaching the blowout panel 2.

In such a case, it is desirable to provide an opening device at the opening and to ensure that the opening area is as large as possible so as not to become a hindrance to releasing the internal pressure of the building.

Therefore, this embodiment adopts each of the above configurations. According to the above configuration, the base end portion 32 of the support mechanism 3 is fixed to a portion outside the opening H. That is, this base end portion 32 is fixed to the reactor building 1 side in a cantilevered manner. Therefore, compared to the case where the base end 32 extends across the opening H, the possibility that the opening area of the opening H is impaired by the base end 32 can be reduced. This makes it possible to more smoothly guide the gas filling the reactor building 1 to the outside through the opening H. Therefore, recovery work in the event of an emergency can be performed more quickly and smoothly.

Further, according to the above configuration, the base end portion 32 and the distal end portion 33 are removable. Thereby, when performing maintenance on the blowout panel 2, for example, the distal end portion 33 can be removed from the base end portion 32. Therefore, the blowout panel 2 is more easily accessible and maintenance can be performed more easily. On the other hand, if the tip portion 33 is not removable, accessibility to the blowout panel 2 from the inside may be impaired, which may cause trouble when performing maintenance. According to the above configuration, such a possibility can be reduced.

In addition, according to the above configuration, a shim S is provided between the base end portion 32 and the distal end portion 33. By varying the thickness of the shim S, the position at which the drive unit 4 presses the blowout panel 2 (that is, the position of the drive unit 4 in the horizontal direction) can be adjusted more precisely. Thereby, the location pressed by the drive unit 4 is optimized, so that the opening device 90 can be operated more stably.

Furthermore, according to the above configuration, the drive section 4 is arranged at a position where it can press the reinforcing material 2R of the blowout panel 2. This can further reduce the possibility that the blowout panel 2 will be damaged when pressed by the drive unit 4, for example, compared to a configuration in which a portion where the reinforcing material 2R is not provided is pressed. In addition, since the pressing force on the blowout panel 2 is distributed and applied to the entire blowout panel 2 via the reinforcing material 2R, the pressing force is applied evenly to the blowout panel 2, and the blowout panel 2 can be detached more smoothly. It becomes possible to do so.

Further, according to the above configuration, only the drive portion 4 is exposed within the opening H when viewed from the inside and outside directions. Therefore, the possibility that the opening area of the opening H will be impaired can be further reduced compared to, for example, a case where a part of the support mechanism 3 is also exposed within the opening H. This makes it possible to more smoothly guide the gas flow passing through the opening H to the outside. Therefore, recovery work in the event of an emergency can be performed more quickly and smoothly.

Further, according to the above configuration, a plurality of opening devices 90 are provided along the edge of the opening H. By operating these opening devices 90 simultaneously, a pressing force is evenly applied to the blowout panel 2 at a plurality of locations, so that the blowout panel 2 can be detached more stably and smoothly.

(Other embodiments)
The embodiments of the present disclosure have been described above. Note that various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure.

For example, in the embodiment described above, an example has been described in which the support mechanism 3 is fixed on the vertical beam 1B. However, the manner in which the support mechanism 3 is fixed is not limited to the above. As a first modification example, as shown in FIG. 4, the support mechanism 3 may further include a steel frame 80 extending between the cross beam 1C arranged on the ceiling of the reactor building 1 and the floor 1F. is also possible. This steel frame 80 is used, for example, when installing the opening device 90 at a location where the above-mentioned longitudinal beam 1B is not arranged. In this case, an example can be considered in which the steel frame 80 is attached to the lower surface or side surface of the cross beam 1C.

Furthermore, as a second modification, as shown in FIG. 5, it is also possible to adopt a configuration in which the opening device 90 is directly fixed to the ceiling surface 1D and floor surface 1F of the reactor building 1. In this case, as shown in the figure, each opening device 90 is fixed in an attitude extending in the vertical direction. Similar to the first modification, this is used when the opening device 90 is installed in a location where the above-mentioned vertical beam 1B is not arranged. Further, even when space cannot be secured on both sides of the opening H in the horizontal direction, this configuration can be suitably used.

In addition, as shown in FIG. 6 as a third modification, it is also possible to change the shape of the support mechanism 3 in some opening devices 90. In the example shown in the figure, of the four opening devices 90, the two opening devices 90 located below further include an auxiliary support mechanism 3C as a part of the support mechanism 3. The auxiliary support mechanism 3C includes a pair of horizontal parts C1 that extend in the horizontal direction and are arranged at intervals in the vertical direction, and a connecting part C2 that connects the ends of the horizontal parts C1 on the opening H side. have. The horizontal portion C1 is fixed to the end face of the vertical beam 1B facing the opening H side. The base end portion 32 described above is fixed at an intermediate position in the vertical direction of the connecting portion C2. For example, such a configuration can be used in a location where other equipment is arranged near the longitudinal beam 1B in order to prevent interference between the equipment and the opening device 90.

Further, in the above embodiment, an example was described in which flanges (the first flange 32F and the second flange 33F) were used as a mode of connection between the base end portion 32 and the distal end portion 33. However, the manner of connection between the base end portion 32 and the distal end portion 33 is not limited to the flange. As other examples, it is also possible to use a spigot joint or a mechanical connector structure, for example.

Further, in the above embodiment, an example in which one opening H is provided with four opening devices 90 has been described. However, the number of opening devices 90 is not limited to four, and may be three or less or five or more depending on the dimensions of the opening H.

Further, the position where the opening device 90 is installed is not limited by the above-described embodiments and each modification, and the opening device 90 may be installed at any position in the vicinity of the opening H and as long as the support mechanism 3 can be fixed. It is possible to install 90.

<Additional notes>
The opening device 90 for the blowout panel 2 described in each embodiment can be understood, for example, as follows.

(1) The blowout panel 2 opening device 90 according to the first aspect is the blowout panel 2 opening device 90 that closes the opening H formed in the wall 1W of the reactor building 1, and includes the a drive unit 4 located inside the reactor building 1 in a region overlapping with the opening H when viewed from the front, and capable of pressing the blowout panel 2 toward the outside of the opening H; , a support mechanism 3 having a proximal end portion 32 fixed to a portion outside the opening H inside the reactor building 1, and a distal end portion 33 that supports the drive portion 4.

According to the above configuration, the base end portion 32 of the support mechanism 3 is fixed to a portion outside the opening H. That is, this base end portion 32 is fixed to the reactor building 1 side in a cantilevered manner. Therefore, compared to the case where the base end 32 extends across the opening H, the possibility that the opening area of the opening H is impaired by the base end 32 can be reduced.

(2) In the blowout panel 2 opening device 90 according to the second aspect, the base end portion 32 and the distal end portion 33 are removably fastened to each other.

According to the above configuration, the base end portion 32 and the distal end portion 33 are removable. Thereby, when performing maintenance on the blowout panel 2, for example, the distal end portion 33 can be removed from the base end portion 32. Therefore, the blowout panel 2 is more easily accessible and maintenance can be performed more easily.

(3) The blowout panel 2 opening device 90 according to the third aspect further includes a shim S provided between the base end portion 32 and the distal end portion 33.

According to the above configuration, the shim S is provided between the base end portion 32 and the distal end portion 33, and the thickness of the shim S is varied to adjust the position at which the drive unit 4 presses the blowout panel 2. More precise adjustments can be made. Thereby, the opening device 90 can be operated more stably.

(4) In the blowout panel 2 opening device 90 according to the fourth aspect, the blowout panel 2 includes a panel body 2H that covers the opening H, and an inner side of the reactor building 1 in the panel body 2H. A reinforcing material 2R provided on the surface is provided, and the drive section 4 is arranged at a position where it can press the reinforcing material 2R.

According to the above configuration, the drive section 4 is arranged at a position where it can press the reinforcing material 2R of the blowout panel 2. This can further reduce the possibility that the blowout panel 2 will be damaged when pressed by the drive unit 4, for example, compared to a configuration in which a portion where the reinforcing material 2R is not provided is pressed. Furthermore, since the pressing force applied to the blowout panel 2 is distributed and applied to the entire structure via the reinforcing material 2R, the blowout panel 2 can be removed more smoothly.

(5) In the blowout panel 2 opening device 90 according to the fifth aspect, only the drive section 4 is exposed inside the opening H when viewed from the opening direction of the opening H.

According to the above configuration, since only the drive unit 4 is exposed inside the opening H, it is possible to further reduce the possibility that the opening area of the opening H will be impaired.

(6) A plurality of opening devices 90 for the blowout panel 2 according to the sixth aspect are arranged at intervals along the edge of the opening H.

According to the above configuration, since a plurality of opening devices 90 are provided, by operating these opening devices 90 at the same time, it becomes possible to detach the blowout panel 2 more stably and smoothly.

1 Reactor building 1A Cross beam 1B Vertical beam 1C Cross beam 1D Ceiling surface 1R Frame body 1S Side wall 1W Wall portion 2 Blowout panel 2A Vertical edge 2B Horizontal edge 2H Panel body 2R Reinforcement material 2S Inner surface 3 Support mechanism 3C Auxiliary support mechanism 4 Drive part 4H Housing 4R Rod 31 Base plate 32 Base end part 32H Base end main body 32F First flange 33 Tip part 33A First part 33B Second part 33F Second flange 80 Steel frame 90 Opening device C1 Horizontal part C2 Connection part H Opening part S sim

Claims (6)

A device for opening a blowout panel that closes an opening formed in a wall of a nuclear reactor building,
a drive unit located inside the reactor building in a region overlapping the opening when viewed from the front, and capable of pressing the blowout panel toward the outside of the opening;
a support mechanism having a base end portion fixed to a portion outside the opening inside the reactor building, and a distal end portion that supports the drive portion;
A blowout panel opening device comprising: The blowout panel opening device according to claim 1, wherein the base end portion and the distal end portion are removably fastened. The blowout panel opening device according to claim 1 or 2, further comprising a shim provided between the base end and the distal end. The blowout panel is
a panel body that covers the opening;
a reinforcing material provided on the inner surface of the reactor building in the panel body;
has
The blowout panel opening device according to any one of claims 1 to 3, wherein the drive section is arranged at a position where the reinforcing material can be pressed. The blowout panel opening device according to any one of claims 1 to 4, wherein only the drive section is exposed within the opening when viewed from the opening direction of the opening. The blowout panel opening device according to any one of claims 1 to 5, wherein a plurality of blowout panel opening devices are arranged at intervals along the edge of the opening.

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