JPS5897696A - Aseismic support structure of fuel storage rack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear reactor fuel storage rack in a nuclear power generation facility, and particularly to an earthquake-resistant support structure thereof.

Nuclear reactor fuel storage racks maintain a fuel storage pitch to prevent criticality or re-criticality, are strong against earthquakes, are lightweight from an economic standpoint, and have a structure that is easy to install. It is hoped that By the way, this type of fuel storage rack is constructed by assembling a beam iottiam as shown in FIG. , a fuel/1 storage pipe is placed on this frame 17, and this storage pipe is
A structure in which it is held by the upper part of the handle has been proposed, but this type has the following problems. That is, since it is necessary to make the storage pipe I which accommodates the new fuel IT have a strong structure, the lower part of the storage pipe I is supported by a frame 17 having a steel frame structure. In addition, since the cross-sectional constant of each member of the frame 17 is set to be large in order to increase the rigidity, the structure inevitably becomes larger and the weight also increases. Furthermore, the horizontal load applied during an earthquake causes a toppling moment of the pedestal/74C, so the structure of the installation legs and fixing fittings/buttons becomes larger to prevent it from tipping over. Further, consideration must be given to thermal stress generated in the beams forming the frame 17, and installation work is also inconvenient.

Therefore, as a result of repeated improvements aimed at overcoming the above-mentioned problem and providing a nuclear reactor fuel storage rack with an earthquake-resistant structure that is lighter in weight and easier to install, we have developed By installing these on the wall of the building and absorbing it from the bracket, suspension means from the ceiling of the building, and K, excellent earthquake resistance can be obtained and thermal displacement due to temperature changes can also be absorbed. Find out 9.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fuel storage rack that is lightweight, easy to install, and has earthquake resistance and thermal displacement tolerance.

In order to achieve the above object, the seismic support structure for a fuel storage rack according to the present invention includes fixing brackets on a plurality of sides at predetermined intervals to Ils in a building, suspending a perforated frame on these brackets, and This perforated frame is suspended and supported from the ceiling of the Ia building, and the fuel storage pipe is held by the ceiling of the building and the perforated frame.

The perforated frame is composed of a perforated plate in which a large number of holes are provided at predetermined intervals for inserting fuel storage pipes.

Further, the means for suspending the pedestal is comprised of one or more steel ropes, and by adjusting the number of the ropes, the central part of the pedestal is prevented from deforming downward due to its own weight.

Other objects and advantages of the invention will become apparent from the following description.

Next, a typical configuration example of the fuel storage rack according to the present invention will be described in detail with reference to the drawings.

In Figure 1, a bracket λ4I is attached to the side wall of the building.
are fixed at predetermined intervals, the pedestal 24 is suspended on these brackets, and the pedestal 24 is further suspended and fixed from the ceiling 1 of the building by a rope JO.

Holes 32 are opened at a predetermined pitch in the frame roller, the lower part of the fuel storage pipe 31 is inserted into these 3 holes, and the upper part of the fuel storage pipe 3 is inserted into the top 3t of the building, and the fuel storage pipe 31 is inserted into the 3 holes. tube 3
It is held by the upper end 7 flange part 31 of the holder.

Store fuel in the fuel storage pipe 3 and seal it with a plug≠2.

In the seismic support structure of the fuel storage rack according to the present invention, the fuel storage pipe 71 is supported by the mount λ4 and the top part 36 of IIall, so that in the event of an earthquake, the horizontal The load is transmitted to and absorbed by the brackets , , z+ via the frame 4. Therefore, the natural frequency is increased to the extent that the vertical beam members of the box-shaped frame in the conventional fuel storage rack are not bent, which is advantageous in terms of earthquake-resistant structure. Further, the own weight in a normal state and the vertical load during an earthquake can be completely absorbed by the bracket λ≠ and the rope 30 suspending the pedestal 1. By adjusting the number of ropes 30 used, it is possible to prevent the central part of the pedestal roller from deforming downward due to its own weight, and even in the event of an earthquake, the gravitational acceleration is greater than the vertical seismic acceleration, so the pedestal roller can be prevented from deforming downward due to its own weight. never rises.

According to the seismic support structure of the fuel storage rack according to the present invention, the above-described deflection, the legs of the pedestal are unnecessary, and the dead weight of the pedestal and the vertical load on the horizontal pot during an earthquake are fixed to the side wall of the building. It will be absorbed by the bracket and the hanging rope from the ceiling of the building, and the following effects are expected. That is, since the lower part of the fuel storage pipe is directly supported on the side of the building, the natural frequency increases, which is advantageous in terms of earthquake-resistant structure. Furthermore, since there is no need for beam members to constitute the legs of the pedestal, the overall weight is reduced, and material and manufacturing costs are reduced. Furthermore, in the event of a horizontal earthquake, there is no risk of an overturning moment being applied to the pedestal, so there is no need to take precautions to prevent overturning, and the design of the installation part is simplified.

The seismic support structure for a fuel storage rack according to the present invention described above is particularly advantageously used for a new fuel storage rack, but it can of course also be suitably applied to a spent fuel storage rack.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional earthquake-resistant support structure for a fuel storage rack, and FIG. 2 is a longitudinal sectional view of an earthquake-resistant support structure according to the present invention. Here...Side wall part Ko...Bracket 2.
... Frame ... Ceiling 30 ... Low -
3.2...hole part 3≠...fuel storage pipe
3... Top part 31... h4 flange part Hiro θ...
Fuel IIt2...Plug

Claims (1)

[Claims] (1) A plurality of brackets are fixed to the inner wall of a building at predetermined intervals, a perforated frame is hung on the brackets, and the perforated frame is suspended and supported from the ceiling of the building. An earthquake-resistant support structure for a fuel storage rack, characterized in that the fuel storage pipe is held by the ceiling of a building and a perforated frame. (2. In the seismic support structure for a fuel storage rack as set forth in claim 7, the perforated frame is made of a perforated plate. (3) The fuel storage rack as set forth in claim 1. In the seismic support structure of the fuel storage rack, the means for suspending the pedestal is made of one or more ropes.