JP2015045586A - Reactor containment vessel anti-buckling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressurized water reactor containment vessel capable of decreasing the probability of occurrence of local buckling if a load applied by an earthquake is added to a static load and design loads such as temperature and pressure.SOLUTION: A pressurized water reactor containment vessel anti-buckling structure includes: a coolant distribution container 23 provided at a top of a dome roof of a containment vessel 1 of a pressurized water reactor; a plurality of perpendicular reinforcement plates 20 extending radially at equal intervals from an outer circumference of the coolant distribution container 23 to a bottom of a middle part 3 of the containment vessel 1; a plurality of outer horizontal reinforcement plates 21 provided in a lower portion of the middle part 3 so as to surround an outside surface of the middle part 3 by one turn; and a plurality of inner horizontal reinforcement plates provided entirely on an inside surface of the middle part 3 so as to surround an inner circumference of the middle part 3 by one turn.

Description

  The present invention relates to a buckling resistant structure for a containment vessel in a pressurized water reactor.

  A containment vessel in a pressurized water reactor is a highly airtight vessel that houses a nuclear reactor, a primary cooling facility, and related facilities. The containment vessel serves as a pressure barrier for the environment and a barrier to the release of radioactive material when radioactive material is released due to fuel damage in the reactor due to a loss of primary coolant, etc. Ensure the safety of the surrounding public and power plant employees.

  An example of a conventional containment vessel in a pressurized water reactor is disclosed in FIG. 1 of Japanese Patent Application Laid-Open No. 2009-236572 and FIG. 1 of Japanese Patent Application No. 2012-5164. In addition, the upper part of the dome of the containment vessel is equipped with a cooling water sprinkling system for cooling the containment vessel in an emergency, and when water is sprinkled from a bucket on the top of the dome (Japanese Patent Laid-Open No. 2009-236572), In the case of forming (Japanese Patent Application No. 2012-5164), various forms are taken. An example of a conventional storage container is indicated by reference numeral 1 in FIG. In this case, watering piping is provided on the dome of the containment vessel.

JP 2009-236572 A Japanese Patent Application No. 2012-5164

  Conventional containment vessels have been appropriately optimized and commercially applied to pressurized water nuclear power plants to achieve the above-mentioned objectives. However, conventional containment works well in regions where the magnitude of earthquakes is small to moderate, but it seems like Asia, such as Japan, India, Indonesia, Thailand, Vietnam, and some European countries such as Turkey. In addition, in a region where a stronger earthquake occurs, the conventional containment vessel cannot be applied. This is because, in a conventional containment vessel, when a load due to an earthquake is applied in addition to a design load such as a static load, temperature, and pressure, local buckling may occur.

  Buckling can be solved by increasing the thickness of the trunk plate of the containment vessel. However, when increasing the thickness of the shell plate, the current design standard requires that a post-weld heat treatment process (PWHT) be added to the containment vessel. Therefore, when the post-weld heat treatment process is performed, the construction cost of the containment vessel increases.

  The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a buckling-resistant structure for a storage container that improves the earthquake resistance of the storage container without increasing the thickness of the trunk plate of the storage container.

  A first aspect of the present invention is a cooling water distribution container provided at the top of a dome-shaped roof portion of a containment vessel of a pressurized water reactor, and from the outer periphery of the cooling water distribution container to the bottom of the trunk portion of the containment vessel A plurality of vertical reinforcing plates extending radially at equal intervals, a plurality of outer horizontal reinforcing plates provided around the outer surface of the body portion at the lower portion of the body portion, and the entire inner surface of the body portion And a buckling-resistant structure for a containment vessel of a pressurized water reactor, comprising a plurality of inner horizontal reinforcing plates provided so as to surround the inner periphery of the trunk part.

  According to the first aspect of the present invention, the vertical reinforcing plate, the outer horizontal reinforcing plate, and the inner horizontal reinforcing plate are provided in the containment vessel of the pressurized water reactor. When a load applied by an earthquake is applied in addition to the load, the possibility of local buckling occurring can be reduced.

  According to the containment-resistant buckling structure of the present invention, it is possible to improve the earthquake resistance of the containment vessel without increasing the thickness of the trunk plate of the containment vessel of the pressurized water reactor.

It is a partial cross section figure of the conventional containment vessel of a pressurized water reactor. It is the schematic of the storage container in 1st embodiment of this invention. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. It is the schematic of the inner side of FIG. FIG. 3 is a partially enlarged view of FIG. 2.

  Hereinafter, a buckling-resistant structure for a storage container according to a first embodiment of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a schematic view showing a cooling structure 10 including a conventional containment vessel 1 of a pressurized water reactor.
The containment vessel 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 lower portion of 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 cooling structure 10 includes a building structure 11 that covers the outside of the storage container 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 extending above 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 cooling structure 10 includes a baffle plate (partition plate) 17 that forms a double annulus portion (annular space) by partitioning a 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. A second flow path 19 is formed in which the cooling air flowing through the first flow path 18 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, in addition to cooling of the containment vessel 1 due to heat absorption when the cooling water sprayed from the cooling water sprinkling system to the containment vessel 1 evaporates, cooling air enters from the intake port 13 and exits from the exhaust port 14. The containment vessel 1 can be cooled by natural ventilation. The arrows in FIG. 1 illustrate the flow of steam and the direction of cooling air when the cooling water is evaporated.

  Hereinafter, a configuration of a containment vessel 1 of a pressurized reactor having a buckling-resistant structure for a containment vessel according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 2 shows a containment vessel 1 of a pressurized reactor having a containment buckling resistant structure according to a first embodiment of the present invention. Compared with the conventional storage container of FIG. 1, a cylindrical cooling water distribution container 23 is provided on the top of the dome-shaped roof portion 2 of the storage container 1, and it is stored radially from the outer periphery of the cooling water distribution container 23. The vertical reinforcing plate 20 extending to the bottom of the body 3 of the container 1 is provided, and the outer surface (outer periphery) of the lower part of the body 3 of the storage container 1 is provided to cover the entire circumference. The difference is that a plurality of outer horizontal reinforcing plates 21 are provided. Hereinafter, the vertical reinforcing plate 20 and the outer horizontal reinforcing plate 21 will be described in detail.

The vertical reinforcing plate 20 is a plate-like member having a substantially constant thickness. In the present embodiment, 20 vertical reinforcing plates 20 are provided at equal intervals along the circumferential direction on the outer periphery of the cooling water distribution container 23, and extend radially from the outer periphery of the cooling water distribution container 23, The outer periphery (outer surface) of one barrel portion 1 is divided into 20 equal parts. Each vertical reinforcing plate 20 extends vertically on the outer surface of the trunk portion 3 until reaching the bottom of the trunk portion 3 of the storage container 1.
Note that a structure such as an air lock 27 and a hatch 28 is provided on the outer surface of the body 3 so as to protrude from the outer surface of the body 3. Therefore, the vertical reinforcing plate 20 is provided so as to avoid a structure protruding from the outer surface of the body portion 3. In addition, there is a vertical reinforcing plate 20 that reaches the bottom of the trunk portion 3, and there is a vertical reinforcing plate 20 that extends from the outer surface of the trunk portion 3 to the vicinity of the structure that does not reach the bottom of the trunk portion 3. There is also a vertical reinforcing plate 20 that extends until it intersects an outer horizontal reinforcing plate 21 described later. That is, the arrangement of the vertical reinforcing plate 20 can be adjusted as appropriate depending on the structure of the outer surface of the body 3.
Further, the vertical reinforcing plate 20 is joined to the outer surface of the body 3 by welding so that no gap is formed between the outer surface of the body 3 and the vertical reinforcing plate 20. In the present embodiment, the vertical reinforcing plate 20 has a thickness of approximately 40 mm. As shown in FIG. 3, the height of the vertical reinforcing plate 20 from the outer surface of the body portion 3 is substantially the same as the height of the cooling water distribution container 23 and is set to be constant up to the bottom of the body portion 3. .

  As shown in FIG. 2, in this embodiment, two outer horizontal reinforcing plates 21 are provided in the lower part of the trunk portion 3 of the storage container 1. Each of the outer horizontal reinforcing plates is provided at the lower part of the body part 3 so as to surround the outer periphery of the body part 3 by one. Unlike the vertical reinforcing plate 20, the outer horizontal reinforcing plate 21 is configured by a combination of a plurality of plate-like members.

4 and 5 show the detailed configuration of the outer horizontal reinforcing plate 21. FIG. The outer horizontal reinforcing plate 21 includes an outer horizontal plate 25, an outer vertical plate 24, and an outer reinforcing plate 26. The outer horizontal plate 25 is a substantially rectangular plate-like member that extends radially outward from the outer surface of the trunk portion 3 of the storage container 1 to a predetermined distance. The outer vertical plate 24 is provided at the distal end of the outer horizontal plate 25, has the same length along the circumferential direction of the distal end of the outer horizontal plate 25 and the trunk portion 3, and is substantially parallel to the outer surface of the trunk portion 3. It is a substantially rectangular plate-like member having a predetermined length in the height direction of the body part 3. The outer reinforcing plate 26 is a trapezoidal plate-like member that protrudes outward in the radial direction of the body 3 from the outer surface of the body 3. One side that is joined to the plate 24 and extends radially outward of the body portion 3 is joined to the outer horizontal plate 25. A plurality of outer reinforcing plates 26 are provided on the outer periphery (outer surface) of the body portion 3 at predetermined intervals along the circumferential direction of the body portion 3 to support the outer horizontal plate 25 and the outer vertical plate 24.
In the present embodiment, 60 outer horizontal plates 25 and 60 outer vertical plates 24 are provided. That is, the outer horizontal plate 25 and the outer vertical plate 24 are provided on the outer periphery of the trunk portion 3 so as to divide the outer periphery of the barrel portion 3 of the storage container 1 into 60 equal parts. The outer horizontal plate 25, the outer vertical plate 24, and the outer reinforcing plate 26 are joined to each other by welding, and there is no gap between the outer surface of the body portion 3 and the outer horizontal plate 25. The height of the outer horizontal reinforcing plate 21 from the outer surface of the trunk portion 3 is set to be constant regardless of the height from the bottom of the trunk portion 3.
Here, in the present specification, the outer side in the radial direction of the body part 3 is the same as the normal direction of the outer surface of the body part 3. Similarly, the inside in the radial direction of the body portion 3 is the same as the normal direction of the inner surface of the body portion 3.

  Here, when the outer horizontal reinforcing plate 21 is installed in the region where the baffle plate 17 of the trunk portion 3 is installed, the outer horizontal reinforcing plate 21 obstructs the rising airflow flowing through the second flow path 19. Therefore, the outer horizontal reinforcing plate 21 is installed below the baffle plate 17 shown in FIG.

As shown in FIG. 4, the height from the outer surface of the trunk | drum 3 of the vertical reinforcement board 20 and the outer side horizontal reinforcement board 21 is substantially the same, and is made constant.
In the present embodiment, 20 vertical reinforcing plates 20 are provided, and the outer periphery of the cooling water distribution container 23 is divided into 20 equal parts. Further, 60 outer horizontal plates 25 and outer vertical plates 24 are provided on the outer surface of the body portion 3. Therefore, as shown in FIGS. 2 and 4, when three combinations of the outer horizontal plate 25 and the outer vertical plate 24 are arranged, one vertical reinforcing plate 20 is installed. As shown in FIG. 4, the outer reinforcing plate 26 is also installed at the place where the vertical reinforcing plate 20 is installed. Therefore, in addition to the vertical reinforcing plate 20, the outer reinforcing plate 26 is also provided at a location where the vertical reinforcing plate 20 exists.

Next, the inner horizontal reinforcing plate 22 will be described. As shown in FIG. 6, a plurality of inner horizontal reinforcing plates 22 are provided inside the trunk portion 3 of the storage container 1. As shown in FIG. 7, the inner horizontal reinforcing plate 22 includes an inner horizontal plate 25 ′, an inner vertical plate 24 ′, and an inner reinforcing plate 26 ′, as with the outer horizontal reinforcing plate 21.
The inner horizontal plate 25 ′ is a substantially rectangular plate-like member that extends radially inward from the inner surface (inner circumference) of the barrel 3 of the storage container 1 to a predetermined distance. The inner vertical plate 24 ′ is provided at the tip of the inner horizontal plate 25 ′, has the same length along the circumferential direction of the barrel portion 3 as the tip of the inner horizontal plate 25 ′, and the inner surface of the barrel portion 3. It is a substantially rectangular plate-like member having a predetermined length in the height direction of the body portion 3 in parallel. The inner reinforcing plate 26 ′ is a trapezoidal plate-like member that protrudes inward in the radial direction of the trunk portion 3 from the inner surface of the trunk portion 3. The long side is joined to the inner surface of the trunk portion 3, and the short side is the inner side. One side that is joined to the vertical plate 24 ′ and extends radially inward of the body portion 3 is joined to the inner horizontal plate 25 ′. A plurality of inner reinforcing plates 26 ′ are provided on the inner periphery (inner surface) of the trunk portion 3 at a predetermined interval along the circumferential direction of the trunk portion 3, and an inner horizontal plate 25 ′ and an inner vertical plate 24 ′ are provided. To support.
In the present embodiment, 60 inner horizontal plates 25 ′ and inner vertical plates 24 ′ are provided. That is, the inner horizontal plate 25 ′ and the inner vertical plate 24 ′ are provided on the inner periphery of the trunk portion 3 so as to divide the inner periphery of the barrel portion 3 of the storage container 1 into 60 equal parts. Further, the inner horizontal plate 25 ′, the inner vertical plate 24 ′, and the inner reinforcing plate 26 ′ are joined to each other by welding, and there is no gap between the inner surface of the body portion 3 and the inner horizontal plate 25 ′. The height of the inner horizontal reinforcing plate 22 from the inner surface of the trunk portion 3 is set to be constant regardless of the height from the bottom of the trunk portion 3.
Here, the outer horizontal plate 25 constituting the outer horizontal reinforcing plate 21 of the present embodiment, the outer vertical plate 24, the thickness of the outer reinforcing plate 26, the inner horizontal plate 25 ′ constituting the inner horizontal reinforcing plate 22, The inner vertical plate 24 ′ and the inner reinforcing plate 26 ′ have a thickness of about 40 mm.

The outer horizontal reinforcing plate 21 is installed below the installation area of the baffle plate 17, whereas the inner horizontal reinforcing plate 22 is provided over the entire inner surface of the body portion 3. This is because there is no possibility that the inner horizontal reinforcing plate 22 obstructs the airflow for cooling the containment vessel 1 inside the trunk portion 3 unlike the outside of the trunk portion 3.
In the present embodiment, the height from the inner surface of the body portion 3 of the inner horizontal reinforcing plate 22 and the height from the outer surface of the body portion 3 of the outer horizontal reinforcing plate 21 are substantially the same and constant.

  On the other hand, the vertical reinforcing plate 20 is not provided inside the trunk portion 3 of the containment vessel 1. This is because when the vertical reinforcing plate 20 is installed inside the trunk portion 3, the installation space for various devices stored in the storage container 1 is reduced.

  According to the storage container 1 having the buckling-resistant structure for a storage container of the present embodiment including the vertical reinforcing plate 20, the outer horizontal reinforcing plate 21, and the inner horizontal reinforcing plate 22 as described above, compared to the conventional storage container. In addition to design loads such as static load, temperature, and pressure, when an earthquake load is applied, the possibility of local buckling occurring can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, 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 spirit of the present invention.

  For example, in the present embodiment, the height of the vertical reinforcing plate 20 from the outer surface of the trunk portion 3 of the storage container 1 is constant, but the height gradually increases from the bottom of the trunk portion 3 toward the upper portion of the trunk portion 3. May be set to be higher. This is because the lower part of the containment vessel 1 is close to the foundation of the containment vessel 1 buried in the ground and is strong against a load such as an earthquake, so that a place away from the foundation is more reinforced. .

  The height from the outer surface of the storage container 1 of the outer horizontal reinforcing plate 21 and the height from the inner surface of the trunk portion 3 of the storage container 1 of the inner horizontal reinforcing plate 22 are the height from the bottom of the trunk portion 3. However, as the height from the bottom of the trunk portion 3 increases, the height of the outer horizontal reinforcing plate 21 from the outer surface of the storage container 1 and the inner horizontal reinforcing plate 22 of the storage container 1 You may make the height from the inner surface of the trunk | drum 3 high. This is also because the lower part of the containment vessel 1 is close to the foundation of the containment vessel 1 buried in the ground and is strong against a load such as an earthquake, so that a place away from the foundation is more reinforced. .

  In the present embodiment, the thickness of the vertical reinforcing plate 20, the outer horizontal plate 25 constituting the outer horizontal reinforcing plate 21, the outer vertical plate 24, the thickness of the outer reinforcing plate 26, and the inner horizontal plate constituting the inner horizontal reinforcing plate. The thickness of the plate 25 ′, the inner vertical plate 24 ′, and the inner reinforcing plate 26 ′ is approximately 40 mm, but may be appropriately adjusted according to the size of the storage container 1, the strength desired to be achieved, and the like.

  In this embodiment, 20 vertical reinforcing plates 20 are provided, the outer periphery of the cooling water distribution container 23 is equally divided into 20 parts, and the outer horizontal plate 25 and the outer vertical plate 24 are the outer surface of the trunk portion 3 of the storage container 1. The outer periphery of the body part 3 is equally divided into 60 parts, but can be appropriately adjusted according to the size of the storage container 1 and the strength desired to be achieved.

  Moreover, the buckling-resistant structure for the containment vessel of the pressurized water reactor according to the present invention is easily used in combination with the conventional containment vessel provided with the cooling water sprinkling system shown in Japanese Patent Application Laid-Open No. 2009-236572 and Japanese Patent Application No. 2012-5164. can do.

1 containment vessel, 2 dome-shaped roof, 3 trunk, 4 reactor, 5 steam generator, 10 cooling structure, 16 sprinkling pipe, 17 baffle plate, 18 first flow path, 19 second flow path, 20 vertical reinforcement Plate, 21 outer horizontal reinforcing plate, 22 inner horizontal reinforcing plate, 23 cooling water distribution container, 24 outer vertical plate, 24 'inner vertical plate, 25 outer horizontal plate, 25' inner horizontal plate, 26 outer reinforcing plate, 26 'inner Reinforcement plate, 27 Airlock, 28 hatch

Claims (7)

A cooling water distribution vessel provided at the top of the dome-shaped roof of the containment vessel of the pressurized water reactor;
A plurality of vertical reinforcing plates extending radially from the outer periphery of the cooling water distribution container to the bottom of the trunk of the storage container at equal intervals;
A plurality of outer horizontal reinforcing plates provided at the lower part of the body part so as to surround the outer surface of the body part by one circumference;
A plurality of inner horizontal reinforcing plates provided so as to wrap around the inner periphery of the trunk portion over the entire inner surface of the trunk portion; and a buckling resistance for a containment vessel of a pressurized water reactor, Construction. The outer horizontal reinforcing plate comprises a plurality of outer horizontal plates, outer vertical plates, and outer reinforcing plates,
The outer horizontal plate is a substantially rectangular plate-like member extending outward in the radial direction of the trunk portion from the outer surface of the trunk portion to a predetermined distance.
The outer vertical plate is provided at the tip of the outer horizontal plate, has the same length along the tip of the outer horizontal plate and the circumferential direction of the barrel, and is substantially parallel to the outer surface of the barrel. Is a substantially rectangular plate-like member having a predetermined length in the height direction of the body portion,
The outer reinforcing plate is a trapezoidal plate-like member that protrudes radially outward of the barrel from the outer surface of the barrel, a long side is joined to the outer surface of the barrel, and a short side is One side that is joined to the outer vertical plate and extends radially outward of the trunk is joined to the outer horizontal plate,
The inner horizontal reinforcing plate includes a plurality of inner horizontal plates, inner vertical plates, and inner reinforcing plates,
The inner horizontal plate is a substantially rectangular plate-like member extending inward in the radial direction of the trunk portion from the inner surface of the trunk portion to a predetermined distance.
The inner vertical plate is provided at the tip of the inner horizontal plate, has the same length along the circumferential direction of the tip of the inner horizontal plate and the barrel, and is substantially parallel to the inner surface of the barrel. Is a substantially rectangular plate-like member having a predetermined length in the height direction of the body portion,
The inner reinforcing plate is a trapezoidal plate-like member that protrudes inward in the radial direction of the trunk from the inner surface of the trunk, a long side is joined to the inner surface of the trunk, and a short side is 2. The seat for a containment vessel of a pressurized water reactor according to claim 1, wherein one side that is joined to the inner vertical plate and extends radially inward of the trunk portion is joined to the inner horizontal plate. Bent structure.   The height of the vertical reinforcing plate and the outer horizontal reinforcing plate from the outer surface of the body portion and the height of the inner horizontal reinforcing plate from the inner surface of the body portion are substantially the same and constant. A buckling-resistant structure for a containment vessel of a pressurized water reactor according to any one of claims 1 and 2.   The height from the outer surface of the said trunk | drum of the said vertical reinforcement board becomes high gradually toward the upper part of the said trunk | drum from the bottom of the said trunk | drum. Buckling-resistant structure for containment vessels of pressurized water reactors.   5. The buckling-resistant structure for a containment vessel of a pressurized water reactor according to claim 1, wherein the outer horizontal reinforcing plate is provided below a baffle plate of the containment vessel. The vertical reinforcing plate is provided so as to divide the outer periphery of the trunk part into 20 equal parts,
The outer horizontal plate and the outer vertical plate are provided so as to divide the outer periphery of the trunk part into 60 equal parts,
The containment of the pressurized water reactor according to any one of claims 1 to 5, wherein the inner horizontal plate and the inner vertical plate are provided so as to divide the inner periphery of the trunk portion into 60 equal parts. Buckling resistant structure for containers.   A containment vessel for a pressurized water reactor comprising the buckling-resistant structure for a containment vessel for a pressurized water reactor according to any one of claims 1 to 6.

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