JP2635829B2 - Support structure inside the PCV - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe and a pedestal installed in a reactor vessel of a boiling water reactor.
TECHNICAL FIELD The present invention relates to a support structure in a reactor containment vessel for supporting an arrangement such as a cable and a duct.

[0003]

2. Description of the Related Art A reactor containment vessel of an improved boiling water reactor has a rectangular shape as shown in FIG.
And the reactor pressure vessel 3 erected on the pedestal 2
And a suppression chamber 4 is provided below.

A vent pipe 5 is provided in the suppression chamber 4, and the vent pipe 5 communicates with a communication hole 6 formed in the pedestal 2. As shown in FIG. 5, the cross section of the communication hole 6 has an upper side of about 2 m and a lower side of 1.5 m.
m, a fan shape approximating a trapezoid with a height of about 1 m, and the length of the communication hole 6 is about 8 m. The pedestal 2 supporting the reactor pressure vessel 3 is arranged in the vertical direction.

In the drawings, reference numeral 7 denotes a discharge pipe, 8 denotes a dry well, and 9 denotes a wet well.

[0006]

By the way, the communication hole 6 provided in the pedestal 2 is very narrow and deep, and in the conventional example, the work such as installation and welding of the piping and the like in the communication hole 6 is performed. Difficult, dangerous and time consuming.
The communication hole 6 is a flow path through which the steam in the dry well 8 flows to the suppression chamber 4 at the time of an accident. The free flow path cross-sectional area excluding the reduction of the cross-sectional area of the communication hole due to the pipes, cables, ducts, and other components provided in the communication hole 8 and the structure supporting these is provided below the communication hole. Unless the cross-sectional area is larger than the vent pipe 5, it is difficult to smoothly discharge steam from the dry well 8 into the suppression chamber 4 and suppress pressure by steam condensation, which are important functions of the boiling water reactor containment vessel 1.

Therefore, in the conventional example, there is a problem that the cross-sectional area of the free passage of the communication hole 6 is smaller than the cross-sectional area of the vent pipe 5.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to safely and easily install an object in a communication hole in a short time. An object of the present invention is to provide a support structure in a reactor containment vessel that can sufficiently exhibit the function of the containment vessel. [Configuration of the Invention]

[0009]

SUMMARY OF THE INVENTION The present invention relates to a support structure in a reactor containment vessel, which is inserted into a communication hole of a pedestal erected in a reactor containment vessel and supports an arrangement. A horizontal beam framed in a shape that can be inserted into the horizontal beam, a plurality of columns having a length along a longitudinal direction of the communication hole that is attached to the horizontal beam and erected, and the plurality of columns and the horizontal beam And a support member for fixing objects such as ducts, cable conduits, cable chutes and pipes attached to the unit structure, and a platform attached to the horizontal beam. And a shape memory alloy restraining member provided on the outer surface of the support and pressed against the inner wall surface of the communication hole of the pedestal.

[0010]

In the unit structure assembled with the horizontal beam and the plurality of columns, the objects such as pipes provided in the communication hole are fixed, and are collectively and integrally carried into the communication hole. Thus, the loading / installing operation can be completed safely, easily and in a short time.

In addition, the function of supporting the own weight and the function of restraining in the horizontal direction are separated by the supporting method by the unit structure, and the welding work after the unit structure is carried into the communication hole can be minimized by providing the functions in separate parts. Complete the installation work easily and quickly.

In addition, by setting the set levels of the direct support member such as a pipe and the platform on which a person descends in several groups, the cross-sectional area of the free passage can be reduced in any cross section of the communication hole. And the function of the boiling water reactor containment vessel can be sufficiently ensured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a support structure in a containment vessel according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing the whole of the present invention, FIG. 2 is a top view showing a state where the support structure of FIG. 1 is inserted into a communication hole, and FIG. 3 is a vertical view showing a main part of FIG. FIG.

In FIG. 1, reference numeral 10 denotes a horizontal beam which is slightly smaller than the cross-sectional area of the communication hole 6 of the pedestal shown in FIG. At each corner of the horizontal beam 10, four columns 11 are integrally united in a three-dimensional scaffold to form a unit structure 12. A platform 13 on which the worker gets down is mounted and fixed to the horizontal beam 10, and a contact plate 14 that is in contact with the inner surface of the communication hole 6 is connected to a horizontal end of the horizontal beam 10. A support member 19 for supporting an arrangement such as a pipe 15, a duct 16, a cable conduit 17, and a cable chute 18 is provided at an arbitrary position in the up and down direction with an interval in the vertical direction. A restraining member 20 made of a shape memory alloy is attached to a side surface of the horizontal beam 10 and pressed against the inner wall surface of the communication hole 6 of the pedestal. The number of the support columns 11 is not necessarily four, but may be three as long as it has a strength capable of supporting the horizontal beam 10, the arrangement, the support member 19, and the like. it can.

Thus, the column 11 of the support structure 12 in the containment vessel having the above-described configuration is installed on the bracket 21 installed at the bottom of the communication hole 12, and the horizontal movement is performed by the horizontal beam 10 and the communication hole 6. Is restrained by the inner wall surface.

The restraining member 20 is attached to one end of the horizontal beam 10 in such a manner that the short direction of the elongated flat plate is bent in a U-shape and is in contact with the longitudinal direction, and the shape memory alloy is used at the ambient temperature during operation. The structure is such that the alloy is pressed against and fixed to the inner wall surface of the communication hole 6 by using a deforming force.

According to the above embodiment, the unit structure 12
Can be carried into the communication hole 6 and the work in the communication hole 6 having a very narrow cross-sectional area can be performed only by the welding work of the unit structure 12 and the bracket 21. Therefore, not only is it very effective in shortening the construction period, but also the number of working steps in the communication hole 6 is reduced, which is also effective from the viewpoint of safety.

Further, since the support members and the platforms 13 which are divided into groups have different installation levels,
The reduction in the free flow path cross-sectional area of the communication hole 6 can be minimized. Thereby, the steam generated in the dry well 8 at the time of the accident is smoothly guided to the suppression chamber 4 through the vent pipe 5 without blocking the flow passage in the communication hole 6, and the function of the boiling water reactor containment vessel 1 is secured. You.

[0020]

According to the present invention, the installation of pipes and the like in the communication hole can be carried out safely, easily, and in a short time, so that the function of the boiling water reactor containment vessel can be sufficiently achieved. Can be demonstrated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a support structure in a containment vessel according to the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an elevation view showing a main part of FIG. 1;

FIG. 4 is a longitudinal sectional view schematically showing the inside of a reactor containment vessel.

FIG. 5 is an enlarged top view showing the communication hole in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Containment vessel, 2 ... Pedestal, 3 ... Reactor pressure vessel, 4 ... Suppression chamber, 5 ... Vent pipe, 6
... Communication hole, 7 ... Discharge pipe, 8 ... Dry well, 9 ... Wet well, 10 ... Horizontal beam, 11 ... Prop, 12 ... Unit structure, 13 ... Platform, 14 ... Plate plate, 15 ... Piping, 16 ...
Duct, 17… Cable conduit, 18… Cable chute, 19… Support member, 20… Shape memory alloy restraint member, 21…
bracket.

Claims (1)

(57) [Claims] 1. A reactor containment vessel support structure which is inserted into a communication hole of a pedestal erected in a reactor containment vessel and supports an arrangement, has a shape which can be inserted into the communication hole. A unit structure formed by a framed horizontal beam, a plurality of columns having a length along a longitudinal direction of the communication hole which is attached to and erected from the horizontal beam, and the plurality of columns and the horizontal beam Body and duct attached to this unit structure,
A support member for fixing an arrangement such as a cable conduit, a cable chute, and a pipe; a platform attached to the horizontal beam; and a shape provided on an outer surface of the column and pressed against an inner wall surface of a communication hole of the pedestal. A support structure in a containment vessel, comprising a memory alloy restraining member.