JPH1062585A - Out-of-pile fuel storage equipment for fast reactors - Google Patents

Abstract

(57) [Problem] To provide an out-of-reactor fuel storage facility for a fast reactor, in which the number of guide cylinders and the number of fuel transfer pots are small, the size of a rotary rack is small, and fuel angle management is easy. A relay tube (6) is provided at the outermost periphery of a rotating rack (20), and a fuel transfer pot (1) containing fuel discharged from a nuclear reactor is relayed via a guide tube (3) installed at a position corresponding to the relay tube (6). 6, the rotary rack 20 is rotated to a position where the rotary rack 20 is engaged with the transfer device 7 in the tank, and only the fuel 9 is taken out into the storage tube 10 by the gripper 8 of the transfer device 7 in the tank. With the rotation of, the cylinder is aligned with a predetermined fuel storage cylinder 12 and the fuel 9 is stored therein. Note that sodium is drawn into the storage cylinder 10 and the fuel 9 is transferred while cooling with sodium. Further, the fuel storage cylinder 12 is hexagonal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an off-reactor fuel storage facility for storing fuel in sodium, such as fuel for fast reactors.

[0002]

2. Description of the Related Art FIG. 3 is a schematic sectional view of a conventional out-of-reactor fuel storage facility for a fast reactor. Since the fuel of the nuclear reactor has a high calorific value, it is stored in a fuel transfer pot 1 containing sodium as a coolant, carried out of the nuclear reactor, and transferred to a fuel storage facility outside the reactor by a transfer device. The fuel transferred to the out-of-pile fuel storage facility is arranged on a plurality of concentric circles of the rotating rack 2 via guide cylinders 3 provided corresponding to each row on the concentric circle of the rotating rack 2. It is directly stored in a cylindrical fuel storage cylinder (not shown) (substantially the same as the outer shape of the fuel transfer pot) while being stored in the fuel transfer pot 1.

[0003]

In the prior art,
There are the following three problems. (1) The fuel is directly stored in the fuel storage cylinders in each row of the rotary rack 2 while being transported by the transfer device, that is, while being stored in the fuel transfer pot 1, The guide cylinders 3 of the number corresponding to each row on the concentric circle are required.

(2) Further, since the fuel is stored in the fuel storage cylinder of the rotary rack 2 while being stored in the fuel transfer pot 1, the fuel transfer pots 1 for the number of fuels are required, and the space for storing the fuel is large. The dimensions of the rotating rack 2, the storage container 4, and the fuel storage facility are large. (3) When transferring fuel to the reactor, take into account the ease of insertion into the core,
It is necessary to grasp the rotation angle of the fuel, but since the shape of the fuel storage cylinder is circular, the angle at the time of storage is not restricted, and it is necessary to adjust the angle again immediately before transfer to the reactor. .

Since the prior art has the above-mentioned problems, the present invention solves these problems, reduces the number of guide cylinders and the number of fuel transfer pots, and reduces the size of the rotating rack and the storage container. It is an object of the present invention to provide a fuel storage facility outside a reactor for a fast reactor, which can grasp the angle of fuel to be transferred to a nuclear reactor.

[0006]

According to the present invention, a relay cylinder is provided at the outermost peripheral portion of a rotary rack, and a rotary plug provided on a part of a shielding plug is provided at a position eccentric from a rotation center of the rotary plug. It has a storage cylinder which is installed on the rotary plug and temporarily stores fuel, and has an in-tank transfer device which can take in and out fuel from all fuel storage cylinders of the rotary rack by rotating the rotary rack and the rotary plug.

[0007] When fuel is supplied to this facility, the fuel transfer pot containing the fuel is received by the relay tube, only the fuel is taken out by the transfer device in the tank, and the fuel is stored in the fuel storage tube of the rotating rack. When discharging fuel, the operation is completely reversed. Therefore, the fuel transfer pot stops at the relay tube, and only the fuel is transferred inside the fuel transfer pot. Also,
The in-tank transfer device is provided with means for drawing sodium filled around the rotary rack into the storage tube. By doing so, the fuel can be cooled with sodium even in the storage cylinder. As means for drawing sodium into the storage cylinder, a vacuum pump may be connected to the in-tank transfer device.

Further, the shape of the fuel storage cylinder of the rotary rack is preferably a hexagon similar to that of the fuel, and it is preferable that the hexagonal surfaces face each other in the circumferential direction of the rotary rack. This is because the storage efficiency of the fuel becomes the highest, and at the same time, the angle management when transferring the fuel to the nuclear reactor becomes easy.

[0009]

Embodiments of the present invention will be described below. [First Embodiment] FIG. 1 is a schematic sectional view showing an embodiment of an out-of-pile fuel storage facility for a fast reactor (hereinafter abbreviated as an out-of-pile fuel storage facility) according to the present invention. Note that members having the same functions as those of the related art are denoted by the same reference numerals.

[0010] The fuel transfer pot 1 containing the fuel carried out of the reactor is temporarily stored in the relay cylinder 6 provided at the outermost periphery of the rotary rack 20 of the fuel storage facility outside the reactor via the guide cylinder 3. . Next, the relay cylinder 6 is rotated to a position where the relay cylinder 6 is connected to the in-tank transfer device 7, and the fuel 9 is transferred from the fuel transfer pot 1 into the storage tube 10 of the in-tank transfer device 7 by the gripper 8 of the in-tank transfer device 7.
Take out. At this time, in order to cool the fuel, the pressure in the storage tube 10 is reduced by a pressure reducing pump (not shown), sodium is drawn into the storage tube 10, and in this state, the rotary plug 11 and the rotary rack 20 are rotated, and The storage cylinder 10 of the transfer machine 7 and the predetermined fuel storage cylinder 12 of the rotary rack 20 are combined, and the fuel 9 is stored in the predetermined fuel storage cylinder 12 of the rotary rack 20 by the gripper 8 of the in-tank transfer apparatus 7. Since the inside of the out-of-pile fuel storage facility is an argon atmosphere pressurized to a pressure slightly higher than the atmospheric pressure, sodium can be drawn into the storage cylinder 10 by reducing the pressure.

When taking out fuel, the reverse operation is performed. [Second Embodiment] FIG. 2 is a view showing the shape of a fuel storage cylinder 12 according to a second embodiment of the present invention as viewed from the direction P in FIG. The configuration of the out-of-pile fuel storage facility is the same as that of the first embodiment, except that the shape of the fuel storage tube 12 is a hexagon similar to that of the fuel 9, and the hexagonal surfaces of the rotary rack 20 face each other in the circumferential direction. It has become. With this arrangement, the circumferential pitch of the rotating rack 20 can be reduced,
In addition, the size of the storage container 4 is reduced.

The gripper 8 of the in-tank transfer device 7 is provided with a rotation mechanism for adjusting the angle between the fuel 9 and the fuel storage tube 12 of the rotary rack 20.

[0013]

According to the present invention, the fuel is supplied to the rotating rack.
20 is transported in a state of being stored in the fuel transfer pot 1, but thereafter, only the fuel 9 is transported by the in-tank transporter 7 and the rotary rack 20 is transported.
Is stored in the fuel storage tube 12. Therefore, first, only one guide cylinder 3 is required. Further, since the number of the fuel transfer pots 1 is up to the relay cylinder, it is necessary to select the number according to the situation, but at least one can be used. Moreover, since only the fuel 9 is stored in the rotary rack 20, the storage space is reduced, and the dimensions of the rotary rack 20 and the storage container 4 are reduced.

Further, by making the shape of the fuel storage cylinder 12 a hexagon similar to that of the fuel 9 and arranging the hexagonal surfaces facing each other in the circumferential direction of the rotary rack 20, the storage space is minimized, and It is easy to grasp the angle of the fuel immediately before the fuel is transferred, and the reliability of the fuel angle management is improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an out-of-reactor fuel storage facility for a fast reactor according to the present invention.

FIG. 2 is a view showing a shape of a fuel storage cylinder according to a second embodiment of the present invention as viewed from a direction P in FIG. 1;

FIG. 3 is a schematic cross-sectional view showing an off-reactor fuel storage facility for a fast reactor according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel transfer pot 2, 20 rotation rack 3 Guide cylinder 4 Storage container 5, 50 Shielding plug 6 Relay cylinder 7 Tank transfer machine 8 Gripper 9 Fuel 10 Storage cylinder 11 Rotation plug 12 Fuel storage cylinder

Claims (4)

[Claims] 1. A high-speed rotating car having a rotary rack having a fuel storage cylinder for storing fuel, cooling sodium filled around the rotary rack, and a shielding plug for shielding radioactivity and heat released from the fuel. In a furnace external fuel storage facility, a relay cylinder provided at the outermost periphery of a rotary rack, a rotary plug provided at a part of a shielding plug, and a rotary plug at a position eccentric from a rotation center of the rotary plug. It has a storage cylinder that is installed on the top and temporarily stores fuel, and is equipped with an in-tank transfer device that can take fuel in and out of all fuel storage cylinders of the rotary rack by rotating the rotary rack and the rotary plug. Out-of-pile fuel storage equipment for fast reactors. 2. The fuel storage facility for a fast reactor as claimed in claim 1, wherein the in-tank transfer device includes means for drawing sodium filled around the rotary rack into the storage cylinder. . 3. The furnace for a fast reactor according to claim 2, wherein the means for drawing sodium filled around the rotary rack into the storage cylinder is a vacuum pump connected to an in-tank transfer machine. Outside fuel storage facility. 4. The fuel storage cylinder of the rotary rack has a hexagonal shape similar to that of fuel, and the fuel storage cylinder is arranged so that hexagonal surfaces face each other in the circumferential direction of the rotary rack. The external fuel storage facility for a fast reactor according to any one of claims 1 to 3.