JP2011220840A - Cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure capable of improving safety and workability of maintenance.SOLUTION: A containment vessel cooling structure 10 includes: a building structure 11 which covers a containment vessel 1 with a predetermined gap and has a suction port and an exhaust port of cooling air; and a baffle plate 17 which partitions the gap and forms a first flow passage 18, where the cooling air sucked from the suction port descends in a space of the building structure 11 side, and a second flow passage 19, where the cooling air passed through the first flow passage 18 ascends toward the exhaust port in a space of the containment vessel 1 side. The baffle plate 17 is constituted of a plurality of panels 17a, and the building structure 11 is constituted of a plurality of panel mounting parts 26 by which one or the plurality of the panels 17a are detachably mounted at every predetermined height, and a plurality of communication passages 23 which are provided for the every predetermined height and communicate the first flow passage 18 with the outside.

Description

  The present invention relates to a cooling structure.

  Patent Document 1 discloses a containment vessel cooling device that cools a containment vessel (cooling object) of a pressurized water reactor. The containment vessel cooling apparatus divides the gap by covering the containment vessel with a predetermined gap and forming an intake port and an exhaust port for cooling air, and sucks air from the intake port into a space on the building structure side. A baffle plate (partition plate) that forms a first flow path in which the cooled cooling air descends and forms a second flow path in which the cooling air that has flowed through the first flow path rises toward the exhaust port in the storage container side space And a cooling structure.

JP 2009-236572 A

  By the way, the containment vessel requires regular maintenance (inspection, painting work, etc.). The baffle plate is attached to the storage container side provided with a fixture called a support, and the baffle plate must be removed when performing maintenance by accessing the storage container. However, since there is no scaffolding on the baffle side and the building side, the worker has been removing the baffle plate on the bucket suspended from the air inlet or the like to the first flow path. There was a problem. In addition, even when the baffle plate is removed, difficulty in handling is expected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling structure capable of improving maintenance safety and workability.

In order to solve the above-described problems, the present invention provides a building structure in which a predetermined gap is provided to cover an object to be cooled and an intake port and an exhaust port for cooling air are formed, and the gap is partitioned to form the building structure. A first flow path in which the cooling air drawn from the intake port descends is formed in a body-side space, and the cooling air that has flowed through the first flow path in the space to be cooled is directed toward the exhaust port. And a partition plate that forms a second flow path that rises, wherein the partition plate is composed of a plurality of plate bodies, and the building structure body includes the plate body at every predetermined height. One or a plurality of partition plate attachment portions that are detachably attached, and a plurality of communication passages that are provided at each predetermined height and communicate with the outside and the first flow path are employed.
By adopting this configuration, in the present invention, the partition plate can be attached to the building structure side. And a some communication channel | path is installed in a building structure, and it can access a 1st flow path for every predetermined height. The partition plate is composed of a plurality of plate bodies, and when one or a plurality of plate bodies are removed at a predetermined height in the first flow path, the cooling object on the back side can be accessed at a predetermined height. Become.

Moreover, in this invention, the said building structure employ | adopts the structure that it has the some rod body provided in the said 1st flow path substantially horizontally and provided with the predetermined space | interval for every said predetermined height.
By adopting this configuration, in the present invention, the scaffold can be installed at every predetermined height by hanging the plate body on the rod body that protrudes substantially horizontally in the first flow path. Further, even if the rod body is protruded into the first flow path, the reduction of the flow path area is small, and even if it is permanently installed, the flow of the cooling air is hardly hindered.

Moreover, in this invention, the structure that the said rod is provided so that folding is possible is employ | adopted.
By adopting this configuration, in the present invention, the flow of the cooling air can be made smooth by folding the rod body other than during maintenance.

Moreover, in this invention, the said building structure employ | adopts the structure of having an opening-and-closing door which opens and closes the said communication channel.
By adopting this configuration, in the present invention, it is possible to prevent the cooling air from flowing out from the communication passage and to smoothly flow the cooling air from the intake port to the exhaust port.

According to the present invention, the building structure in which the cooling object is covered with a predetermined gap and the cooling air intake port and the exhaust port are formed, and the gap is partitioned, and the intake port is formed in the building structure side space. A first flow path in which the cooling air sucked from the air flows down, and a second flow path in which the cooling air flowing through the first flow path in the space to be cooled rises toward the exhaust port. The partition plate is composed of a plurality of plates, and the building structure is detachable with one or a plurality of the plates at a predetermined height. By adopting a configuration that includes a plurality of partition plate mounting portions to be attached to each other and a plurality of communication passages that are provided at each predetermined height and communicate with the outside and the first flow path, the partition plate has a building structure. It can be attached to the body side. And a some communication channel | path is installed in a building structure, and it can access a 1st flow path for every predetermined height. The partition plate is composed of a plurality of plate bodies, and when one or a plurality of plate bodies are removed at a predetermined height in the first flow path, the cooling object on the back side can be accessed at a predetermined height. Become.
Therefore, in the present invention, maintenance can be performed without hanging the bucket as in the prior art, so safety and workability can be improved.

It is sectional drawing which shows the structure of the containment vessel cooling structure of the pressurized water reactor in 1st Embodiment of this invention. It is line view AA sectional drawing in FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is an arrow X figure in FIG. It is a figure which shows the structure of the containment vessel cooling structure in 2nd Embodiment of this invention. It is a figure which shows the structure of the containment vessel cooling structure in 2nd Embodiment of this invention. It is a figure which shows the structure of the containment vessel cooling structure in 3rd Embodiment of this invention. It is a figure which shows the structure of the containment vessel cooling structure in 3rd Embodiment of this invention. It is a figure which shows the structure of the gusset for scaffold installation in another embodiment of this invention.

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

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a containment vessel cooling structure 10 of a pressurized water reactor according to a first embodiment of the present invention.
The containment vessel (cooling object) 1 includes a dome-shaped roof portion 2 having a predetermined slope angle at the top and a cylindrical trunk portion 3 connected to the dome-shaped roof portion 2. In this containment vessel 1, a nuclear reactor 4, a steam generator 5 and the like are accommodated.

  The containment vessel cooling structure (cooling structure) 10 includes a building structure 11 that covers the outside of the containment vessel 1 with a shielding wall 12 with a predetermined gap. The building structure 11 has an air inlet 13 formed on the side thereof and an air outlet 14 formed on the top thereof. The building structure 11 includes a water storage tank 15 provided so as to surround the exhaust port 14. A water spray pipe 16 facing the top of the dome-shaped roof portion 2 of the storage container 1 is attached to the bottom of the water storage tank 15. The water dripped from the water spray pipe 16 takes heat from the storage container 1 by heat of vaporization, evaporates, and is exhausted from the exhaust port 14 to the outside air.

  The containment vessel cooling structure 10 has a baffle plate (partition plate) 17 that forms a double annulus portion by partitioning the gap between the containment vessel 1 and the building structure 11 and forms a cooling ventilation path. The baffle plate 17 divides the gap to form a first flow path 18 in which cooling air (air) sucked from the intake port 13 descends in the space on the building structure 11 side, and the space on the storage container 1 side. The cooling air flowing through the first flow path 18 is configured to form a second flow path 19 that rises toward the exhaust port 14.

  According to this configuration, the cooling air heated to a high temperature by exchanging heat with the high-temperature containment vessel 1 becomes an updraft in the second flow path 19 and is sequentially exhausted from the exhaust port 14 to the outside. Then, the cooling air sucked from the intake port 13 and descending the first flow path 18 naturally flows into the second flow path 19. Therefore, according to this configuration, the containment vessel 1 can be cooled by natural ventilation in which cooling air enters from the intake port 13 and exits from the exhaust port 14.

Next, the detailed structure of the containment vessel cooling structure 10 will be described with reference to FIGS.
2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is an arrow X view in FIG.

The building structure 11 of the present embodiment has a steel (steel) structure. As shown in FIGS. 2 and 3, the building structure 11 includes a plurality of building ribs 20 provided radially and a plurality of building horizontal ribs 21 provided at predetermined heights. Is formed. Further, the building structure 11 has a plurality of flow path ribs 22 for making the baffle plate 17 an integral structure. The channel ribs 22 are provided integrally with the building ribs 20 or separately and radially.
The building horizontal rib 21 also functions as a scaffold for workers performing maintenance. Further, between the building horizontal ribs 21 adjacent to each other in the height direction shown in FIG. 3, stairs and ladders (not shown) are provided so that an operator can come and go.

  As shown in FIG. 3, the building structure 11 is provided with communication passages (manholes, latent holes) 23 at predetermined heights corresponding to the building horizontal ribs 21. The communication passage 23 is formed so as to penetrate the shielding wall 12 and is configured to communicate the outside with the first flow path 18. The diameter of the communication passage 23 of the present embodiment is a size that allows an operator to pass through (for example, 550φ to 600φ). An opening / closing door 24 is provided in the communication passage 23. During maintenance, the opening / closing door 24 is opened, and an operator accesses the first flow path 18. The open / close door 24 is an iron lid and can be opened and closed by a hinge or the like.

On the side of the first flow path 18 that has passed through the communication passage 23, scaffolding installation gussets (rods) 25 are provided at predetermined heights corresponding to the building horizontal ribs 21. A plurality of scaffold installation gussets 25 project substantially horizontally from the shielding wall 12 to the first flow path 18 and are provided at predetermined intervals along the inner peripheral surface of the shielding wall 12 (see FIG. 2). Note that the scaffold installation gusset 25 is a rod body, and even if the scaffolding gusset 25 protrudes into the first flow path 18, the reduction of the flow path area is small.
The operator installs a scaffold for working at a predetermined height in the first flow path 18 by passing a plate or the like over the scaffold installation gusset 25. In addition, the distance between the shielding wall 12 of this embodiment and the baffle plate 17 is about 700 mm, and the distance between the baffle plate 17 and the storage container 1 is about 200 mm.

As shown in FIGS. 3 and 4, the baffle plate 17 is composed of a plurality of panels (plate bodies) 17a. As shown in FIG. 3, the building structure 11 includes a plurality of panel attachment portions (partition plate attachment portions) 26 that removably attach a plurality of panels 17 a at predetermined heights corresponding to the building horizontal ribs 21.
The operator faces the panel mounting portion 26 in which the channel ribs 22 and the channel horizontal ribs 27 shown in FIG. 4 are combined in a lattice shape in the first channel 18 in which the scaffold is formed. To do. The attachment / detachment of the panel 17a in the present embodiment is performed by screwing / unscrewing the screw 29 into / from the flange portion 28 (see FIGS. 2 and 4) of the channel rib 22 having a substantially T shape in plan view. Do.

Next, the operation of the operator when performing maintenance of the storage container 1 in the storage container cooling structure 10 having the above-described configuration will be described.
First, the worker goes up the building structure 11 and heads for a communication passage 23 provided in a section having a predetermined height. Then, the operator opens the opening / closing door 24 and accesses the first flow path 18.
Next, the operator hangs a plate or the like on the scaffold installation gusset 25 to form a scaffold for maintenance work in the first flow path 18. When the scaffold is formed, the operator enters the first flow path 18.

An operator removes the panel 17a from the panel attachment part 26 using a scaffold. When one or more panels 17a are removed, the storage container 1 is exposed on the back side (200 mm ahead), so the operator performs desired maintenance (inspection, painting work, etc.).
When the maintenance in the section is completed, the operator attaches the panel 17a removed at the time of maintenance to the panel attaching portion 26, and goes out from the first flow path 18 through the communication passage 23 to the outside. And an operator removes a scaffold, closes the opening-and-closing door 24, and goes to the maintenance of the following division.

Therefore, according to the above-described embodiment, the building structure 11 that covers the containment vessel 1 with a predetermined gap and is formed with the cooling air intake port 13 and the exhaust port 14, and the gap are partitioned to form a building structure. A first flow path 18 in which the cooling air sucked from the air inlet 13 descends is formed in the space on the body 11 side, and the cooling air circulated through the first flow path 18 in the space on the storage container 1 side faces the exhaust port 14. And a baffle plate 17 that forms a second flow path 19 that rises, and the baffle plate 17 includes a plurality of panels 17a, and the building structure 11 has a predetermined height. One or a plurality of panel 17a is attached to each panel detachably, and a plurality of connecting passages 23 are provided at the predetermined heights and communicate with the outside through the first flow path 18. By adopting the configuration Allows mounting the baffle plate 17 to the building structure 11 side. And the some communication channel | path 23 is installed in the building structure 11, and it can access the 1st flow path 18 for every predetermined height. The baffle plate 17 is composed of a plurality of panels 17a. When one or more panels 17a are removed from the first flow path 18, the storage container 1 on the back side can be accessed at predetermined heights.
Therefore, in this embodiment, since maintenance can be performed without hanging the bucket as in the prior art, safety and workability can be improved.

Further, in the present embodiment, the building structure 11 has a scaffolding gusset 25 that is a plurality of bar bodies that protrude substantially horizontally to the first flow path 18 at predetermined intervals and are provided at predetermined intervals. By adopting the configuration, the scaffold can be installed at every predetermined height by spanning the plate body to the scaffold installation gusset 25 protruding substantially horizontally to the first flow path 18. Further, since the scaffold installation gusset 25 is a rod body, even if the scaffolding gusset 25 protrudes into the first flow path 18, the decrease in the flow path area is small, and even if it is permanently installed, the flow of the cooling air is hardly hindered.
Further, in the present embodiment, the building structure 11 has a configuration in which an opening / closing door that opens and closes the communication passage 23 is employed to prevent the cooling air from flowing out of the communication passage 23, and from the intake port 13. The flow of the cooling air toward the exhaust port 14 can be made smooth.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.
5 and 6 are views showing the configuration of the containment vessel cooling structure 10 in the second embodiment of the present invention. FIG. 5 is a diagram of a portion corresponding to FIG. 2 of the first embodiment described above. FIG. 6 is a diagram of a portion corresponding to FIG. 3 of the first embodiment described above.

  The building structure 11 of the second embodiment has a steel / concrete structure. As shown in FIGS. 5 and 6, the building structure 11 includes a plurality of building ribs 20 provided radially and a plurality of building horizontal ribs 21 provided at predetermined heights, and a plurality of sections are provided. It is formed and the concrete 30 is filled in the section.

  As shown in FIG. 6, the building structure 11 is provided with communication passages (manholes, latent holes) 23 at every predetermined height. The communication passage 23 is formed through the concrete 30 and is configured to communicate the outside and the first flow path 18. In addition, an opening / closing door 24 is provided on each of the outside of the communication passage 23 and the first flow path 18, and the operator opens the opening / closing door 24 to access the first flow path 18 during maintenance. In addition, a staircase, a ladder, and the like (not shown) are provided on the outside of the concrete 30 so that an operator can go back and forth between the communication passages 23 adjacent in the height direction.

  According to the second embodiment, a plurality of communication passages 23 are installed in the building structure 11 and can be accessed to the first flow path 18 at every predetermined height. Alternatively, by removing a plurality, it becomes possible to access the storage container 1 on the back side at every predetermined height. Therefore, in the second embodiment, maintenance can be performed without suspending the bucket as in the conventional case, so that safety and workability can be improved.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.
7 and 8 are diagrams showing the configuration of the containment vessel cooling structure 10 according to the third embodiment of the present invention. In addition, FIG. 7 is a figure of the site | part corresponding to FIG. 2 of 1st Embodiment mentioned above. FIG. 8 is a diagram of a portion corresponding to FIG. 3 of the first embodiment described above.

  Building structure 11 of 3rd Embodiment has RC (steel reinforced concrete) structure. As shown in FIG. 7, the building structure 11 is provided with a reinforced concrete 33 between a cylindrical inner diameter side mold (shielding wall 12) and a cylindrical outer diameter side mold 31. A plurality of stud bolts 32 are driven into the iron molds 12 and 31, and the molds 12 and 31 and the reinforced concrete 33 are in close contact with each other to form an integral structure.

As shown in FIG. 8, the building structure 11 is provided with communication passages (manholes, latent holes) 23 at every predetermined height. The communication passage 23 is formed through the reinforced concrete 33 and communicates with the outside and the first flow path 18. The communication passage 23 is formed in the reinforced concrete 33 so as to avoid the reinforcing bars. In addition, the reinforced concrete 33 is configured to reinforce the communication passage 23 with the opening reinforcing bars in a lattice shape.
Opening / closing doors 24 are provided on the outside of the communication passage 23 and the first flow path 18, respectively. During maintenance, the opening / closing door 24 is opened, and an operator accesses the first flow path 18. In addition, on the outside of the mold 31, a not-shown staircase, a ladder, and the like are provided so that an operator can go back and forth between the communication passages 23 adjacent in the height direction.

  According to the third embodiment, a plurality of communication passages 23 are installed in the building structure 11 and can access the first flow path 18 at every predetermined height. Alternatively, by removing a plurality, it becomes possible to access the storage container 1 on the back side at every predetermined height. Therefore, in the third embodiment, maintenance can be performed without suspending the bucket as in the conventional case, so that safety and workability can be improved.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, the scaffold installation gusset 25 has been described as being permanently installed in a state of protruding into the first flow path 18, but as shown in FIG. 9, the scaffold installation gusset 25 is provided so as to be foldable. Also good. In FIG. 9, a hinge 34 is provided at the proximal end of the scaffold installation gusset 25 and is configured to be rotatable between a position protruding horizontally to the first flow path 18 and a position along the first flow path 18. It has become. Reference numeral 35 denotes a support member, which is configured to be movable between a position for supporting the scaffold installation gusset 25 and a position along the first flow path 18. According to this configuration, the scaffold installation gusset 25 can be folded at times other than during maintenance, and the flow of cooling air in the first flow path 18 can be made smoother.

  For example, in the above embodiment, the containment vessel of the nuclear reactor has been described as an object to be cooled. However, the present invention is not limited to this configuration, and for example, the pressure vessel of the nuclear reactor is the object to be cooled. It may be a configuration.

  DESCRIPTION OF SYMBOLS 1 ... Containment container (cooling object), 10 ... Containment container cooling structure (cooling structure), 11 ... Building structure, 13 ... Intake port, 14 ... Exhaust port, 17 ... Baffle plate (partition plate), 17a ... Panel (plate body), 18 ... first flow path, 19 ... second flow path, 23 ... communication passageway, 24 ... opening / closing door, 25 ... scaffolding gusset (rod), 26 ... panel mounting portion (partition plate mounting) Part)

Claims (4)

The building structure that covers the object to be cooled with a predetermined gap and that is formed with an inlet and an outlet for cooling air, and the cooling that is partitioned from the gap and is sucked into the space on the building structure side from the inlet A partition plate forming a first flow path in which the wind descends, and forming a second flow path in which the cooling air that has flowed through the first flow path in the space on the cooling object side rises toward the exhaust port; A cooling structure comprising:
The partition plate is composed of a plurality of plate bodies,
The building structure is
One or a plurality of the plate bodies for each predetermined height, a plurality of partition plate mounting portions for detachably mounting;
A cooling structure having a plurality of communication passages provided at each predetermined height and communicating between the outside and the first flow path.   2. The cooling structure according to claim 1, wherein the building structure includes a plurality of bar bodies that protrude substantially horizontally in the first flow path at predetermined intervals and are provided at predetermined intervals.   The cooling structure according to claim 2, wherein the rod body is foldable.   The cooling structure according to any one of claims 1 to 3, wherein the building structure includes an opening / closing door that opens and closes the communication passage.

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