JPH0980183A - Primary containment vessel - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To increase the rigidity of a vessel wall portion and to realize an increase in size of a steel reactor pressure vessel. A container wall portion (4a) of a steel reactor containment container (4).
The reinforcing ring plate 16A is fixed by welding to the outer surface or the inner surface of the attachment portion of the penetrating member attached to. The reinforcing ring plate 16A is arranged along the circumferential direction of the container wall 4a, and the abutting portion of the penetrating member to the outer surface is fixed by welding. The reinforcing ring plate 16A suppresses the displacement of the penetrating member mounting portion due to the membrane vibration so that stress does not act.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-scale steel reactor containment vessel for housing a reactor pressure vessel.

[0002]

2. Description of the Related Art FIG. 7 shows an outline of a reactor containment vessel in a conventional nuclear power plant.
A reactor pressure vessel (RPV) 3 is supported on the PV pedestal 2, and the reactor pressure vessel 3 and the RPV pedestal 2 are supported.
A steel reactor containment vessel (SCV) 4 is constructed so as to surround the above, and its outside is covered with a concrete building 5, and in the reactor containment vessel 4, the R
A lower dry well 6 is formed at a position below the reactor pressure vessel 3 surrounded by the PV pedestal 2, and a suppression chamber 7 is formed at an outer peripheral position of the RPV pedestal 2, and at a side of the reactor pressure vessel 3. In addition, above the suppression chamber 7, a reactor shielding wall 8 is constructed on the RPV pedestal 2, and a diaphragm floor 9 is constructed at the level of the upper end of the RPV pedestal 2 to form an upper dry well 10. In the spherical shell portion of the vessel wall portion 4a constituting the reactor containment vessel 4, an airlock position 11 for allowing a worker to move in and out of the upper dry well 10, and a hatch 12 for carrying in and out a device.
In addition, a hatch 12 and a penetration 13 for the suppression chamber 7 are provided in the cylindrical portion of the container wall 4a. Reference numeral 12a denotes a lid that is openably and closably attached to the hatch 12, and 14 denotes an access tunnel to the lower dry well 6.

Recently, as the output of the plant has increased, the reactor containment vessel 4 has been planned to be upsized, and the use of high-strength steel is being considered.

[0004]

However, when high-strength steel is adopted to increase the size of the reactor containment vessel 4, it is possible to cover the strength side, but it is not sufficient to cover the rigid side. Is believed to be. For example, if the diameter is
In the case of a large reactor containment vessel 4 of 40 to 50 m, it is conceivable to increase the plate thickness to increase the rigidity.
The plate thickness is limited to about 38 mm, and the container wall 4a
Since a penetrating member such as the hatch 12 and the penetration 13 is attached to the penetrating portion provided in the, the membrane vibration may occur at the time of an earthquake or the like as the rigidity decreases. When this membrane vibration occurs, the displacement of the penetrating member mounting portion where the mass is partially large becomes large and the stress also increases. Therefore, when planning a large reactor containment vessel 4 made of steel, increasing the rigidity is an important issue.

Therefore, the present invention is intended to provide a steel reactor containment vessel which is structurally improved not only in strength when it is enlarged, but also in rigidity.

[0006]

In order to solve the above problems, the present invention provides an outer surface or an inner surface of a mounting portion of a penetrating member which is mounted by penetrating through a vessel wall portion of a steel reactor containment vessel, A reinforcing member extending in the circumferential direction is attached, and the reinforcing member is fixed to the penetrating member.

Since the rigidity of the container wall is increased, even if the diameter of the reactor containment vessel is increased, the problem of membrane vibration during an earthquake is small, and the penetrating member of the container wall having a large mass is partially present. The displacement is small and the stress is small even at the mounting part.

Further, when a reinforcing member extending in the vertical direction is attached to the outer surface or the inner surface of the mounting portion of the penetrating member penetrating the container wall portion and fixed to the penetrating member, the rigidity of the container wall portion is increased. Will be higher.

Further, when the fixing portion of the reinforcing member to be fixed to the penetrating member is enlarged so as to project in the radial direction, the mounting rigidity of the penetrating member to the container wall portion is enhanced.

[0010]

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

FIGS. 1A and 1B show a steel reactor containment vessel 4 having a structure similar to that shown in FIG.
7 shows an embodiment of the present invention adopted to enhance the rigidity of the attachment portion of the hatch 12 and the penetration 13 shown in the A portion of FIG. 7, which is the vessel wall portion 4a of the reactor containment vessel 4.
Is constructed by assembling a plurality of block-shaped wall plate 4b, and the hatch 12 as a penetrating member is attached to a mounting portion of the hatch 12 by previously inserting the hatch 12 into an insert plate 17 having a thick plate structure. In this configuration, the insert plate 17 is inserted between the upper, lower, left, and right wall plate 4b to weld the joining portion 17a between the insert plate 17 and the surrounding wall plate 4b, and further, the penetration 13 as a penetrating member. At the mounting portion of the insert plate 18, the insert plate 18 (fixing portion) having a thick plate structure is mounted by penetrating the penetration 13 in advance, and the insert plate 18 is partially assembled in the wall plate 4b.
In the structure in which the joint portion 18a between the wall plate 8 and the wall plate 4b is welded, the container wall portion 4a of the attachment portion of the hatch 12 and the attachment portion of the penetration 13 is reinforced with a reinforcing material.

More specifically, the hatch 12 as a penetrating member.
A reinforcing ring plate 16A having an I-shaped cross section as a reinforcing material is provided on the outer surface of the container wall 4a at the mounting portion of
Are vertically arranged in a plurality of stages (three stages in the figure) so as to be at right angles to the outer surface of the container wall 4a, arranged in the circumferential direction, and fixed by welding.
Fix the butt portion of A on the outer surface of the hatch 12 by welding,
Similarly, a reinforcing ring plate 16A as a reinforcing member is erected on the outer surface of the container wall portion 4a so as to be perpendicular to the outer surface of the container wall portion 4a at the mounting portion of the penetration 13 as the penetrating member. Are arranged in the circumferential direction and fixed by welding, and the reinforcing ring plate 16A and the penetration 13 are fixed by welding. In addition, 19 shows a scallop.

In the case of a large reactor containment vessel 4, since there is no reinforcing ring plate 16A in the prior art, the vessel wall 4a
As the rigidity of the lower part of the container decreases, the membrane vibration occurs at the time of an earthquake, and the displacement and the stress of the attachment part of the hatch 12 and the penetration 13 where the mass is partially increased increase. On the outer surface of 4a, the hatch 12
Since the reinforcing ring plate 16A is mounted in the circumferential direction corresponding to the mounting position of and the reinforcing ring plate 16A is also mounted in the circumferential direction at the mounting position of the penetration 13, the rigidity of the container wall portion 4a is enhanced. The problem of membrane vibration is reduced by the presence of the hatch 12
It is possible to suppress the displacement at the mounting position portion of the penetration 13 and the penetration 13 and to avoid applying a large stress.

Therefore, it is possible to increase the size of the reactor containment vessel 4.

In the above embodiment, the reinforcing ring plate 16A arranged at the mounting portion of the hatch 12 or the penetration 13 is divided into required lengths and used as a supplement.

Next, FIG. 2 shows another embodiment of the present invention, which is attached to the container wall portion 4a in the same structure as that shown in the embodiment of FIGS. 1 (a) and (b). A reinforcing plate 15 as a reinforcing material having an I-shaped cross section is erected on the outer surface of the attachment portion of a certain hatch 12 and the penetration 13 so as to be perpendicular to the container wall portion 4a and arranged in the vertical direction (axial direction). Fixing by welding and hatch 12 of reinforcement plate 15 and penetration 1
The abutting part to 3 is fixed by welding.

In the case shown in FIG. 2, since the mounting portion of the penetrating member of the container wall 4a is reinforced not only in the circumferential direction but also in the vertical direction, the rigidity can be further improved.

Next, FIG. 3 shows still another embodiment of the present invention. In the same structure as the embodiment shown in FIGS. 1A and 1B, a reinforcing ring for the hatch 12 and the penetration 13 is provided. The rib 16a is provided at the butt fixing portion of the plate 16A and is enlarged so as to project in the radial direction.

In the case shown in FIG. 3, the hatch 1
Since the ribs 16a are provided on the butt fixing portions of the reinforcing ring plate 16A that is directly joined to the reinforcement ring plate 2 and the penetration 13, the strength of the fixing portion of the reinforcing ring plate 16A and the hatch 12 and the penetration 13 can be increased, The mounting rigidity with respect to the container wall 4a can be increased. Note that, also in the embodiment shown in FIG. 2, the fixing portion of the reinforcing plate 15 to the hatch 12 and the penetration 13 may be similarly enlarged.

Further, FIG. 4 (a) (b) and FIG. 5 (a).
(B) shows another embodiment of the present invention, and shows another modified example used in place of the reinforcing ring plate 16A. First, the one shown in FIG. 4 employs a reinforcing ring material 16B having a T-shaped cross section, and (a) shows the penetration 13 of the container wall 4a.
The case where the reinforcing ring material 16B is attached to the outer surface of the attachment portion in the circumferential direction is shown, and (B) shows the rib 16 at the butt fixing portion of the reinforcing ring material 16B to the penetration 13.
This is a case where b is provided. On the other hand, FIG. 5 shows a plate having an I-shaped cross section similar to that of the reinforcing ring plate 16A and used as a reinforcing ring band 16C in a flat plate shape. (A) shows the outer surface of the penetration wall 13a of the container wall 4a. 2 shows the case where it is attached in a so-called headband shape, and (b) shows the case where the rib 16c is provided at the butt fixing portion of the reinforcing ring band 16C with respect to the penetration 13.

These FIG. 4 (a) (b) and FIG. 5 (a)
The rigidity of the container wall portion 4a can be increased even by using a deformed reinforcing material as shown in (b).

In each of the above embodiments, the reinforcing ring plate 16A, the reinforcing plate 15, and the reinforcing ring member 16 are used.
B, the case where the reinforcing material such as the reinforcing ring band 16C is attached to the outer surface of the container wall portion 4a is shown. For example, FIG. 6 shows a cross section when the reinforcing ring plate 16A is arranged in the attachment portion of the penetration 13. As described above, the same effect can be obtained even if a reinforcing material such as the reinforcing ring plate 16A is attached to the inner surface of the container wall portion 4a. Further, in the above embodiment, the reinforcing material fixed at the attachment position of the penetration 13 is Although the ring shape is shown, depending on the diameter of the penetration 13, a reinforcing member having a required length formed in an arc shape may be used.
In the above embodiment, the case where the hatch 12 and the penetration 13 that are attached to the cylindrical portion of the container wall 4a are attached is shown, but the same can be applied to the attachments of other penetrating members. Needless to say, various changes can be made without departing from the scope of the present invention.

[0023]

As described above, according to the reactor containment vessel of the present invention, a reinforcing member extending in the circumferential direction is attached to the outer surface or the inner surface of the attachment portion of the penetrating member attached to the vessel wall. Therefore, it is possible to increase the rigidity of the container wall, which can reduce the problem of membrane vibration due to earthquakes, etc., and suppress the displacement to be small even in the part where the penetrating member is attached, which is partially heavy. It is possible to prevent a large stress from being applied, and therefore, it is possible to increase the size of the steel container, and
By adding a reinforcing member extending in the up-down direction, the rigidity of the container wall can be further increased, and further, the fixing portion of the reinforcing member with respect to the penetrating member is enlarged so as to project in the radial direction, so that the container of the penetrating member is expanded. It has an excellent effect that the mounting rigidity to the wall can be increased.

[Brief description of drawings]

1 shows an outline of an embodiment of a reactor containment vessel of the present invention, (a) is an enlarged perspective view showing a portion corresponding to a portion A of FIG. 7, and (b) is (a) ) Is a BB arrow view.

FIG. 2 is a schematic diagram showing another embodiment of the present invention.

FIG. 3 is a schematic diagram showing still another embodiment of the present invention.

FIG. 4 shows another example of the shape of the reinforcing material, (a) is T
FIG. 3 is a perspective view showing an example in which a reinforcing ring material having a mold cross-sectional shape is arranged at a mounting portion of a penetration, and (b) is a plan view when a fixing portion of the reinforcing ring material to the penetration is radially projected.

FIG. 5 shows another example of the shape of the reinforcing material.
Is a perspective view showing an example of arranging a reinforcing ring band to be used as a flat plate at the attachment part of the penetration, and (b) is a plan view when the fixing part of the reinforcing ring band to the penetration is extended in the radial direction. is there.

FIG. 6 is a plan view showing an example of a state in which a reinforcing material is attached to the inner surface of the container wall.

FIG. 7 is a schematic diagram showing an example of a reactor containment vessel.

[Explanation of symbols]

 4 Reactor Containment Vessel 4a Vessel wall 12 Hatch (penetrating member) 13 Penetration (penetrating member) 15 Reinforcement plate (reinforcement material) 16A Reinforcement ring plate (reinforcement material) 16B Reinforcement ring material (reinforcement material) 16C Reinforcement ring band (reinforcement material) Material)

Claims (3)

[Claims] 1. A reinforcing member extending in a circumferential direction is attached to an outer surface or an inner surface of a mounting portion of a penetrating member which is penetratingly attached to a vessel wall portion of a steel reactor containment vessel, and the reinforcing material penetrates through the penetrating member. A reactor containment vessel having a structure fixed to a member. 2. The atom according to claim 1, wherein a reinforcing member extending in a vertical direction is attached to an outer surface or an inner surface of a mounting portion of a penetrating member which is penetrating the container wall portion, and the reinforcing member is fixed to the penetrating member. Furnace containment vessel. 3. A fixing portion of a reinforcing material fixed to the penetrating member,
The reactor containment vessel according to claim 1 or 2, which is enlarged so as to project in the radial direction.