JP2013164387A - Nuclear reactor cooling structure and constructing method of nuclear reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear reactor cooling structure and a constructing method of a nuclear reactor capable of reducing work time and cost, by reducing working man hours at removal work of a scaffold and attachment work of a baffle plate.SOLUTION: The nuclear reactor cooling structure according to a first embodiment of the present invention is a cooling structure of a nuclear reactor 1 that includes a baffle plate 14 which is arranged between a nuclear reactor containment vessel 11 and a nuclear reactor building 12 and forms a cooling flow channel 13 for air-cooling the nuclear reactor containment vessel 11. The nuclear reactor cooling structure has a fixing member 2 for fixing the baffle plate 14 to a surface of the nuclear reactor containment vessel 11, and a part of the fixing member 2 forms a connection member of a scaffold 3 installed on an outer periphery of the nuclear reactor containment vessel 11 when the nuclear reactor containment vessel 11 is built.

Description

  The present invention relates to a reactor cooling structure and a reactor construction method, and in particular, a reactor cooling structure having a baffle plate disposed between a reactor containment vessel and a reactor building, and an atom having the reactor cooling structure. The present invention relates to a furnace construction method.

  Currently, the most widespread nuclear reactors are light water reactors that use normal water as moderator and coolant. There are two types of light water reactors: Pressurized Water Rector and Boiling Water Rector. There is. For example, a pressurized water reactor (PWR) uses a heat energy generated by a fission reaction to heat pressurized water, which is a primary coolant, to 300 ° C. or higher and supply it to a steam generator, and generates secondary cooling generated from the steam generator. In this method, power is generated by rotating a turbine generator with light water (high-temperature high-pressure steam) as a material (see, for example, Patent Document 1 and Patent Document 2).

  For example, Patent Document 1 discloses a configuration of a PWR (Pressurized Water Reactor), in which air flowing from an inlet (outside air intake) of a reactor building is a baffle plate (baffle plate) and a reactor containment vessel. It is described that the space between the wall surfaces of the reactors rises by natural convection and is discharged into the atmosphere from the exhaust port (outside air discharge port) at the top of the reactor building.

  Patent Document 2 discloses a configuration of a pressurized water reactor in which a baffle plate (baffle plate) is disposed between a reactor containment vessel and a reactor building, and the baffle plate is referred to as a support. It is described as a prior art that it is attached to the reactor containment vessel provided with a fixing tool.

JP 2010-85282 A JP 2011-220840 A

  As described in Patent Document 1 and Patent Document 2 described above, a nuclear reactor containment vessel is generally configured by a cylindrical trunk portion and a dome-shaped roof portion disposed on the upper portion of the trunk portion, A trunk | drum is comprised by the wall member divided | segmented into plurality in the up-down direction and the circumferential direction. At the time of construction of the nuclear reactor, the body is constructed by assembling the wall members in order from the bottom to the top, and a dome-shaped roof portion separately produced is disposed thereon.

  More specifically, the conventional nuclear reactor construction method is as follows.While assembling the wall members in order from the bottom to the top, welding the connecting member for fixing the scaffold to the assembled lower wall member, Fixing the scaffold to a connection member, disposing an upper wall member on the lower wall member, welding the lower wall member and the upper wall member using the scaffold, and After the containment vessel is constructed, the scaffold and the connecting member are all removed, and then the baffle plate is fixed to the surface of the reactor containment vessel.

  In such a conventional nuclear reactor construction method, the scaffold connection member is welded to the surface of the reactor containment vessel to construct the scaffold, and the scaffold connection member is also attached when the scaffold is disassembled after the reactor containment vessel construction. Then, the fixing member that supports the baffle plate is welded to the surface of the containment vessel. In a single nuclear reactor, hundreds to thousands of connecting members and fixing members are used, so it takes time to weld and remove the connecting members for the scaffolding and the fixing members for the baffle plate. There were problems such as a large number of work steps and increased costs.

  The present invention was devised in view of the above-described problems, and by reducing the work man-hours in the scaffold removal work and the baffle plate attachment work, the work time can be shortened and the cost can be reduced. It is an object of the present invention to provide a reactor cooling structure and a reactor construction method.

  According to the present invention, in a reactor cooling structure including a baffle plate that is disposed between a reactor containment vessel and a reactor building and forms a cooling flow path for air-cooling the reactor containment vessel, the baffle plate is A fixing member for fixing to the surface of the reactor containment vessel is included, and the fixing member constitutes a connecting member for a scaffold installed on the outer periphery of the reactor containment vessel when the reactor containment vessel is constructed. A reactor cooling structure is provided.

  The fixing member includes a fixing fitting connected to the surface of the reactor containment vessel, and a connecting member connected to the fixing fitting and the baffle plate, and the fixing fitting constitutes the connection member. May be.

  Further, according to the present invention, the reactor construction having a reactor cooling structure provided with a baffle plate that is disposed between the reactor containment vessel and the reactor building and forms a cooling flow path for air-cooling the reactor containment vessel. In the method, in the middle of assembling the wall member constituting the trunk portion of the reactor containment vessel in order from the bottom to the top, the connecting member for fixing the scaffold to the assembled lower wall member is welded to the connecting member. The scaffold is fixed, an upper wall member is disposed on the lower wall member, the lower wall member and the upper wall member are joined using the scaffold, and the reactor containment vessel is A construction method of a nuclear reactor is provided, wherein the scaffold is removed after construction and the baffle plate is fixed to the connecting member.

  When the baffle plate is fixed, a connecting member may be connected to the connecting member, and the baffle plate may be fixed to the connecting member.

  According to the reactor cooling structure and the reactor construction method according to the present invention described above, by using the fixing member for the baffle plate and the connecting member for the scaffold together, the connecting member welded at the time of constructing the scaffold is not removed. In addition, the baffle plate can be fixed, the work man-hours in the scaffold removal work and the baffle plate mounting work can be reduced, and the work time and cost can be reduced.

It is a figure which shows the nuclear reactor cooling structure which concerns on 1st embodiment of this invention, (a) is a side view, (b) has shown BB arrow sectional drawing in Fig.1 (a). FIG. 2 is an overall configuration diagram of a nuclear reactor having the reactor cooling structure shown in FIG. 1. It is a figure which shows the construction method of the scaffold using the fixing metal fitting shown in FIG. 1, (a) has shown the 1st example, (b) has shown the 2nd example. It is a figure which shows the reactor cooling structure which concerns on 2nd embodiment of this invention, (a) is a side view, (b) is a figure which shows the construction method of the scaffold using the fixing member shown to Fig.4 (a). . It is a figure which shows the construction method of the nuclear reactor which concerns on 1st embodiment of this invention, (a) is a 1st process, (b) is a 2nd process, (c) is a 3rd process, (d) is a 4th. Step (e) shows the fifth step and (f) shows the sixth step. It is a figure which shows the construction method of the nuclear reactor which concerns on 2nd embodiment of this invention, (a) is a 1st process, (b) is a 2nd process, (c) is a 3rd process, (d) is a 4th. Step (e) shows the fifth step.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a figure which shows the reactor cooling structure which concerns on 1st embodiment of this invention, (a) is a side view, (b) is BB arrow sectional drawing in Fig.1 (a). , Shows. FIG. 2 is an overall configuration diagram of a nuclear reactor having the reactor cooling structure shown in FIG. FIGS. 3A and 3B are diagrams showing a method of constructing a scaffold using the fixing bracket shown in FIG. 1. FIG. 3A shows a first example, and FIG. 3B shows a second example.

  The reactor cooling structure according to the first embodiment of the present invention is arranged between the reactor containment vessel 11 and the reactor building 12 and air-cools the reactor containment vessel 11 as shown in FIGS. A cooling structure of the nuclear reactor 1 including a baffle plate 14 that forms a cooling flow path 13, including a fixing member 2 for fixing the baffle plate 14 to the surface of the reactor containment vessel 11. A part constitutes a connecting member of the scaffold 3 installed on the outer periphery of the reactor containment vessel 11 when the reactor containment vessel 11 is constructed.

  The reactor 1 is, for example, a pressurized water reactor (PWR) as shown in FIG. 2, and a reactor pressure vessel 15 that forms a reactor core, a primary cooling system side ( Steam generator 16 that constitutes a heat exchanger that transfers heat generated in the core) to the secondary cooling system, and core makeup water that constitutes a static emergency core cooling system (safety injection system) that can be directly injected into the core Devices such as a tank 17a, a pressure accumulation and injection system tank 17b, and a fuel replacement water tank 17c are arranged.

  The reactor containment vessel 11 is configured by a cylindrical trunk portion 11a and a dome-shaped roof portion 11b disposed on the upper portion of the trunk portion 11a. The trunk portion 11a is divided into a plurality of parts in the vertical direction and the circumferential direction. The wall member 11c is configured. When the reactor containment vessel 11 is constructed, the trunk portion 11a is constructed by assembling the wall members 11c in order from the bottom, and the dome-shaped roof portion 11b separately produced thereon is lifted by a crane or the like. Arranged.

  The reactor containment vessel 11 is made of steel or prestressed concrete, and the wall member 11c is also made of steel or prestressed concrete. Therefore, when constructing the trunk portion 11a of the reactor containment vessel 11, after arranging a plurality of wall members 11c in the circumferential direction and joining them by welding or the like, the plurality of wall members 11c are arranged in the circumferential direction on the upper stage. The upper and lower wall members 11c are arranged and joined by welding or the like, and the circumferential wall members 11c are joined by welding or the like, and this operation is repeated.

  The reactor building 12 is a structure that surrounds the reactor containment vessel 11 with a shielding wall. The reactor building 12 has a plurality of intake ports 12a on the side and an exhaust port 12b on the top. In addition, a water storage tank 12c is formed on the outer periphery of the exhaust port 12b, and water in the water storage tank 12c is dripped onto the dome-shaped roof portion 11b of the reactor containment vessel 11 through a sprinkling pipe 12d. The water dripped from the water spray pipe 12d takes heat from the reactor containment vessel 11 by the heat of vaporization, evaporates, and is exhausted from the exhaust port 12b to the outside air.

  As shown in FIG. 2, the baffle plate 14 is disposed so as to cover the entire circumference between the reactor containment vessel 11 and the reactor building 12. The baffle plate 14 is supported by the upper end portion being connected to the reactor building 12 and the peripheral surface portion being connected to the reactor containment vessel 11. The lower end portion of the baffle plate 14 is not connected to the reactor containment vessel 11 and the reactor building 12, and forms a flow path that connects the outside and the inside of the baffle plate 14. By disposing the baffle plate 14, a first cooling channel 13 a that lowers the air sucked from the inlet 12 a along the space between the reactor building 12 and the baffle plate 14, and the first cooling channel A cooling flow path 13 having a second cooling flow path 13b that raises the air descending along 13a along the space between the reactor containment vessel 11 and the baffle plate 14 can be formed.

  According to such a cooling structure, air (cooling air) heated to high temperature by exchanging heat with the high-temperature reactor containment vessel 11 becomes an ascending air current in the second cooling flow path 13b, and is discharged from the exhaust port 12b to the outside. The air (cooling air) that is exhausted sequentially and is sucked from the intake port 12a and descends through the first cooling channel 13a naturally flows into the second cooling channel 13b. Therefore, in the cooling structure of the reactor 1 including the baffle plate 14, the reactor containment vessel 11 is cooled by sucking air (cooling air) from the intake port 12a and exhausting it from the exhaust port 12b by natural convection. be able to.

  The fixing member 2 for fixing the baffle plate 14 to the surface of the reactor containment vessel 11 is fixed to be connected to the surface of the reactor containment vessel 11 as shown in FIGS. A metal fitting 21 and a connecting member 22 connected to the fixed metal fitting 21 and the baffle plate 14 are provided. The fixture 21 is a plate member welded to the surface of the reactor containment vessel 11 and is connected to the connecting member 22 by a fastener 23 such as a bolt and a nut. The connecting member 22 is connected to the baffle plate 14 by a fastener 24 such as a bolt and a nut. Note that the fixing bracket 21 and the connecting member 22 are made of, for example, a steel material.

  The connecting member 22 is, for example, a support member having a U-shaped cross section or a U-shaped cross section, and is spaced apart from important points in the longitudinal direction (vertical direction) of the baffle plate 14 (for example, joints of the baffle plate 14). Are arranged. For example, the connection position of the fixing bracket 21 is determined by the position where the coupling member 22 is disposed. In this case, two fixing brackets 21 are arranged on one side (a total of four on each side) for one connecting member 22, but the number and arrangement are not limited to this, and one fixing member 21 is provided on each side. The fixing bracket 21 may be disposed, or three or more fixing brackets 21 may be disposed on one side.

  The fixing bracket 21 may be arranged in accordance with the arrangement of the scaffold 3 and the baffle plate 14 may be connected using a part of the fixing bracket 21. In this case, the fixing bracket 21 that is not used after the construction of the nuclear reactor 1 remains in the cooling flow path 13. However, since the fixing bracket 21 has a flat plate shape along the air flow, the flow of air Will not be disturbed.

  And, as shown in FIGS. 3A and 3B, the fixing bracket 21 of the fixing member 2 is a connecting member of the scaffold 3 installed on the outer periphery of the reactor containment vessel 11 when the reactor containment vessel 11 is constructed. Is configured. Here, the first example shown in FIG. 3 (a) shows a case where the scaffold 3 is installed on the upper fixing bracket 21, and the second example shown in FIG. 3 (b) shows the lower fixing bracket. 21 shows a case where the scaffold 3 is installed.

  The scaffold 3 shown in FIG. 3A includes, for example, a scaffold plate 31 that is fixed to the surface of the reactor containment vessel 11 via a fixing bracket 21, a handrail 32 that is disposed on the scaffold plate 31, and a scaffold plate. And a diagonal member 33 disposed on the lower surface of 31. The scaffold plate 31 is connected to the fixing bracket 21 by fasteners 25 such as bolts and nuts. The diagonal member 33 is a member that supports the scaffold plate 31, and a cushioning material 34 (for example, made of rubber) is disposed at a tip portion that contacts the surface of the reactor containment vessel 11.

  Further, the scaffold 3 shown in FIG. 3B includes, for example, a support frame 35 that is fixed to the surface of the reactor containment vessel 11 via the fixing bracket 21, a scaffold plate 31 that is connected to the support frame 35, A handrail 32 disposed on the scaffold plate 31 and a buffer material 36 (for example, made of rubber) disposed on a contact surface of the scaffold plate 31 with the reactor containment vessel 11 are provided. The support frame 35 is connected to the fixture 21 by fasteners 25 such as bolts and nuts. In addition, the construction method of the scaffold 3 is not limited to the one shown in FIGS. 3A and 3B, and any other method may be used as long as the construction method uses the fixing bracket 21.

  Thus, in the present embodiment, a part of the fixing member 2 of the baffle plate 14 constituting the cooling structure of the nuclear reactor 1 (for example, the fixing bracket 21) is placed at a predetermined position when the reactor containment vessel 11 is constructed. The scaffold 3 necessary for the construction of the reactor containment vessel 11 is erected using the fixing member 2 (fixing fitting 21). Therefore, by combining the fixing member 2 of the baffle plate 14 and the connecting member of the scaffold 3, the baffle plate 14 can be fixed without removing the connecting member welded when the scaffold 3 is installed. The number of work steps in the removal work and the baffle plate 14 work can be reduced, and the working time can be shortened and the cost can be reduced.

  Next, a reactor cooling structure according to the second embodiment of the present invention will be described. Here, FIG. 4 is a figure which shows the nuclear reactor cooling structure which concerns on 2nd embodiment of this invention, (a) is a side view, (b) utilized the fixing member shown to Fig.4 (a). It is a figure which shows the construction method of a scaffold. In addition, about the component which overlaps with 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the reactor cooling structure according to the second embodiment shown in FIG. 4A, the fixing member 2 is configured by a member corresponding to the connecting member 22 in the first embodiment, and the scaffold 3 can be connected to the fixing member 2. A fastening hole 26 is formed. The fixing member 2 is, for example, a support member having a U-shaped cross section or a U-shaped cross section, as in the case of the connecting member 22. A plurality of the eyes are arranged at intervals. In the second embodiment, the fixing member 2 is directly welded to the surface of the reactor containment vessel 11.

  As shown in FIG. 4B, the fixing member 2 constitutes a connection member for the scaffold 3 installed on the outer periphery of the reactor containment vessel 11 when the reactor containment vessel 11 is constructed. The scaffold 3 includes, for example, a support frame 37 fixed to the surface of the reactor containment vessel 11 via the fixing member 2, a scaffold plate 31 connected to the support frame 37, and a handrail 32 disposed on the scaffold plate 31. And a diagonal member 33 disposed on the lower surface of the scaffold plate 31. The support frame 37 is connected to the fixing member 2 by fasteners 27 such as bolts and nuts.

  As described above, by using the fixing member 2 directly as a connection member for the scaffold 3 necessary when the reactor containment vessel 11 is constructed, the same effects as those of the first embodiment described above can be obtained. The baffle plate 14 can be fixed without removing the connection member that is sometimes welded, the number of work steps for removing the scaffold 3 and attaching the baffle plate 14 can be reduced, and the work time and cost can be reduced. Can be achieved.

  Then, the construction method of the nuclear reactor 1 which concerns on embodiment of this invention is demonstrated, referring FIG.5 and FIG.6. Here, FIG. 5 is a figure which shows the construction method of the nuclear reactor which concerns on 1st embodiment of this invention, (a) is a 1st process, (b) is a 2nd process, (c) is a 3rd process. , (D) shows the fourth step, (e) shows the fifth step, and (f) shows the sixth step. Moreover, FIG. 6 is a figure which shows the construction method of the reactor which concerns on 2nd embodiment of this invention, (a) is a 1st process, (b) is a 2nd process, (c) is a 3rd process, (D) shows the fourth step and (e) shows the fifth step. In addition, about the component which overlaps with embodiment of the reactor cooling structure mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the construction method of the nuclear reactor 1 according to the first embodiment shown in FIG. 5, the cooling flow path 13 that is disposed between the nuclear reactor containment vessel 11 and the nuclear reactor building 12 and cools the nuclear reactor containment vessel 11 is formed. A method for constructing a nuclear reactor 1 having a reactor cooling structure (see FIG. 2) provided with a baffle plate 14, in which wall members 11 c constituting a trunk portion 11 a of a reactor containment vessel 11 are assembled in order from the bottom to the top. On the way, the connecting member (fixing bracket 21) for fixing the scaffold 3 is welded to the assembled lower wall member 11c, the scaffold 3 is fixed to the connecting member (fixing bracket 21), and the upper wall member 11c is The upper wall member 11c 'is disposed on the lower wall member 11c and the upper wall member 11c' are joined using the scaffold 3, and after the reactor containment vessel 11 is constructed, the scaffold 3 is removed and connected. Baffle pre on member (fixing bracket 21) It is obtained so as to secure the door 14.

  The first step shown in FIG. 5A is a step of welding the fixture 21 to the assembled lower wall member 11c. The fixing bracket 21 has a function as a connection member that fixes the scaffold 3. Since the fixture 21 constitutes a part of the fixing member 2 that fixes the baffle plate 14, the arrangement of the fixture 21 is determined by the arrangement of the fixing member 2.

  The second step shown in FIG. 5B is a step of constructing the scaffold 3 on the fixing bracket 21. Specifically, the scaffolding plate 31 is connected to the fixture 21 with a fastener such as a bolt or nut. The scaffold 3 includes the handrail 32, the diagonal member 33, and the like as described above.

  The third step shown in FIG. 5C is a step of disposing the upper wall member 11c ′ on the lower wall member 11c. Then, using the scaffold 3, the lower wall member 11 c and the upper wall member 11 c ′ are joined (for example, welding). By repeating the first to third steps, the trunk portion 11a of the reactor containment vessel 11 is constructed.

  The fourth step shown in FIG. 5D is a step of removing the scaffold 3. Specifically, the scaffold 3 is removed by removing the scaffold plate 31 from the fixture 21. At this time, the fixing bracket 21 is not removed. The scaffold 3 may be removed after the trunk portion 11a of the reactor containment vessel 11 is constructed, or the entire reactor containment vessel 11 is constructed by arranging the dome-shaped roof portion 11b on the trunk portion 11a. It may be after being done.

  The fifth step shown in FIG. 5 (e) is a step of connecting the connecting member 22 constituting a part of the fixing member 2 that supports the baffle plate 14 to the fixing fitting 21. Specifically, the connecting member 22 is, for example, a support member having a U-shaped cross section or a U-shaped cross section, and is connected to the fixing bracket 21 by a fastener such as a bolt and a nut. The fixing member 2 includes a fixing metal 21 and a connecting member 22.

  The sixth step shown in FIG. 5F is a step of fixing the baffle plate 14 to the fixing member 2. Specifically, the baffle plate 14 is connected to the connecting member 22 by fasteners such as bolts and nuts. Here, as shown in FIG. 5 (b), the fixing bracket 21 constitutes a connection member of the scaffold 3, and the baffle plate 14 is fixed to the fixing bracket 21 via the connecting member 22. Become.

  Therefore, according to the construction method of the nuclear reactor 1 according to the present embodiment described above, the connecting member welded when the scaffold 3 is installed is removed by using the fixing member 2 of the baffle plate 14 and the connecting member of the scaffold 3 together. Therefore, the baffle plate 14 can be fixed, the work man-hours in the removal work of the scaffold 3 and the attachment work of the baffle plate 14 can be reduced, and the work time and cost can be reduced.

  In the construction method of the nuclear reactor 1 according to the second embodiment shown in FIG. 6, the cooling flow path 13 that is disposed between the nuclear reactor containment vessel 11 and the nuclear reactor building 12 and cools the nuclear reactor containment vessel 11 is formed. A method for constructing a nuclear reactor 1 having a reactor cooling structure (see FIG. 2) provided with a baffle plate 14, in which wall members 11 c constituting a trunk portion 11 a of a reactor containment vessel 11 are assembled in order from the bottom to the top. On the way, the connecting member (fixing member 2) for fixing the scaffold 3 to the assembled lower wall member 11c is welded, and the scaffold 3 is fixed to the connecting member (fixing member 2), and the upper wall member 11c is The upper wall member 11c 'is disposed on the lower wall member 11c and the upper wall member 11c' are joined using the scaffold 3, and after the reactor containment vessel 11 is constructed, the scaffold 3 is removed and connected. Baffle plate 1 on member (fixing member 2) It is obtained so as to secure the.

  The first step shown in FIG. 6A is a step of welding the fixing member 2 to the assembled lower wall member 11c. The fixing member 2 is a member that fixes the baffle plate 14 and has substantially the same shape as the connecting member 22 described above. The fixing member 2 is, for example, a support member having a U-shaped cross section or a U-shaped cross section, as in the case of the connecting member 22. A plurality of the eyes are arranged at intervals. And this fixing member 2 has a function as a connection member which fixes the scaffold 3, and has the fastening hole 26 which can connect fasteners, such as a volt | bolt and a nut.

  The second step shown in FIG. 6B is a step of constructing the scaffold 3 on the fixing member 2. Specifically, the support frame 37 connected to the scaffolding plate 31 is connected to the fixing member 2 by a fastener such as a bolt and a nut. The scaffold 3 includes the handrail 32, the diagonal member 33, and the like as described above.

  The third step shown in FIG. 6C is a step of disposing the upper wall member 11c ′ on the lower wall member 11c. Then, using the scaffold 3, the lower wall member 11 c and the upper wall member 11 c ′ are joined (for example, welding). By repeating the first to third steps, the trunk portion 11a of the reactor containment vessel 11 is constructed.

  The fourth step shown in FIG. 5D is a step of removing the scaffold 3. Specifically, the scaffold 3 is removed by removing the support frame 37 from the fixing member 2. At this time, the fixing member 2 is not removed. The scaffold 3 may be removed after the trunk portion 11a of the reactor containment vessel 11 is constructed, or the entire reactor containment vessel 11 is constructed by arranging the dome-shaped roof portion 11b on the trunk portion 11a. It may be after being done.

  The fifth step shown in FIG. 5E is a step of fixing the baffle plate 14 to the fixing member 2. Specifically, the baffle plate 14 is connected to the fixing member 2 by fasteners such as bolts and nuts. In the second embodiment, the fixing member 2 of the baffle plate 14 is used as it is as the connection member of the scaffold 3, and the same effect as the construction method of the nuclear reactor 1 according to the first embodiment described above is obtained.

  The present invention is not limited to the above-described embodiment. For example, the scaffold 3 is connected to the fixing member 2 of the baffle plate 14 and a part (fixing bracket 21) of the fixing member 2 of the baffle plate 14. It goes without saying that various modifications can be made without departing from the spirit of the present invention, such as a mixture of the above and the like.

DESCRIPTION OF SYMBOLS 1 Reactor 2 Fixing member 3 Scaffold 11 Reactor containment vessel 11a Body part 11c, 11c 'Wall member 12 Reactor building 13 Cooling flow path 13a First cooling flow path 13b Second cooling flow path 14 Baffle plate 21 Fixing bracket 22 Connection Element

Claims (4)

In the reactor cooling structure provided with a baffle plate that is arranged between the reactor containment vessel and the reactor building and forms a cooling flow path for air-cooling the reactor containment vessel,
A fixing member for fixing the baffle plate to the surface of the reactor containment vessel;
The reactor cooling structure according to claim 1, wherein the fixing member constitutes a connection member for a scaffold installed on an outer periphery of the reactor containment vessel when the reactor containment vessel is constructed.   The fixing member has a fixing fitting connected to the surface of the reactor containment vessel, and a connecting member connected to the fixing fitting and the baffle plate, and the fixing fitting constitutes the connection member. The reactor cooling structure according to claim 1, wherein: In a reactor construction method having a reactor cooling structure including a baffle plate disposed between a reactor containment vessel and a reactor building and forming a cooling flow path for air-cooling the reactor containment vessel,
In the course of assembling the wall members constituting the trunk of the reactor containment vessel in order from the bottom up,
Welding the connecting member that fixes the scaffold to the assembled lower wall member,
Fixing the scaffold to the connecting member;
An upper wall member is disposed on the lower wall member,
Joining the lower wall member and the upper wall member using the scaffold,
After building the reactor containment vessel, the scaffold is removed,
The baffle plate is fixed to the connection member.
A nuclear reactor construction method characterized by the above.   4. The method of building a nuclear reactor according to claim 3, wherein when the baffle plate is fixed, a connecting member is connected to the connecting member, and the baffle plate is fixed to the connecting member.