JPS5853799A - Nuclear fuel transporting facility - 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] In the present invention, Hiro liquid metal sodium cooled nuclear reactor has a fuel cleaning device that connects the fuel inlet/output machine and the fuel transfer machine running in the fuel storage pool while maintaining a vertically suspended position. This project concerns improvements to nuclear reactor fuel transfer equipment for receiving and transferring fuel.

'At the Yingki nuclear reactor, spent fuel is extracted from the reactor core for a long period of time in a bottle that sufficiently reduces the level of decay heat held by the spent fuel.
A fuel storage pool is installed to cool and store a large number of fuels. On the other hand, the spent fuel that is drawn from the reactor or external fuel storage tank that uses 9km as a coolant has sodium attached to its surface, so the sodium is cleaned before it is drawn into the fuel storage pool. It is necessary to do this. A round cleaning device for cleaning such fuel is installed in the middle of the transfer path before the fuel is drawn into the whirlpool, and in this case, the fuel before cleaning and the fuel after cleaning are handled by storing them in the same transfer container. This must be avoided. Also, from the standpoint of radiation control, it goes without saying that the fuel must be brought into the pool through an area that is shielded from the outside.

Next, FIG. 1 shows a conventional fuel transfer facility constructed based on the above requirements. In the figure, the fuel loading and unloading machines that transfer fuel into and out of the IFi reactor or sodium-cooled fuel storage tank, la and lb, are coffins as fuel storage containers mounted on the running carts of the loading and unloading machines, respectively. The fuel loading/unloading machine runs on rails that were previously laid on the floor along the fuel transfer path inside the fuel handling building. 2
This is a company fuel storage pool, and a fuel storage rack 3 that accommodates several bottles of fuel is installed at the underwater bottom of the pool.The lifting and unloading of fuel in the pool to this rack is carried out by a pool that runs through the pool. This is done according to the fuel transfer machine number. Reference numeral 5 denotes a fuel cleaning device, which is installed under the poolside floor in alignment with the travel route of the fuel inlet/outlet machine 1. Hachi is that door pulp.

A fuel guide pipe 6 with Nitro pulp is installed so that it vertically penetrates the floor surface of the pool side in line with the above-mentioned cleaning device, and the lower end is formed below the water surface of the pool and opens toward the horizontal hole of the 9th cool. Furthermore, there is an underwater transfer machine 7 in the pool that receives and unloads the fuel from the fuel loading/unloading machine 1 through the guide pipe 6 and transfers it underwater to a delivery position to the pool fuel transfer machine number. is in place.

F a is the running rail.

With the above configuration, the fuel is pulled out from the reactor side and has 9 sodium deposits on it, and the coffin IAK on one side of the fuel inlet/output machine 1 is stored and transferred, and when it is transferred to the pool side, it is lowered from the coffin to the fuel cleaning device 5 and deposited on it. A sodium wash is performed.

After cleaning, the fuel was lifted into the other uncontaminated coffin lb, and the fuel inlet/output machine 1 was moved to the position of the guide pipe 6, and at the 9th point, it was lowered into the underwater fuel transfer machine through the guide pipe 6. Ink. At this point, it is separated from the fuel loading/unloading machine 1, and then the underwater fuel transfer armor is moved to the left to deliver the receiver to the pool fuel transfer machine 4, and finally stored in the underwater storage rack 3. During the entire transfer process mentioned above, the fuel tank is maintained in a suspended vertical position. Also, since the fuel is drawn into the pool water from the coffin via the guide pipe, there is no need for the radiation beam to be extracted.

However, in the conventional equipment described above, before the fuel is drawn into the pool, the cleaned fuel is transferred from the cleaning device to the guide pipe 6 that opens on the floor above the pool water level. It must be raised above the floor. Moreover, since the fuel before cleaning and the fuel after cleaning must be handled separately, the fuel inlet/output machine 1 requires two independent coffin graves and 1b. Storing spent fuel in a 1-Fin filter: Although it has a good internal structure, it is extremely heavy and expensive to manufacture. As shown in the figure, two fines are mounted on a running trolley, and in addition to the economical disadvantage of being expensive, it is also heavy, so it is difficult to move the running trolley accordingly. It is difficult to obtain sufficient earthquake resistance, and it is also disadvantageous from an earthquake-resistant design perspective.

This expansion of W14 was carried out in consideration of the points mentioned above, and its purpose was to improve the conventional equipment and create an advantageous fuel transfer system that is more economical and has fewer problems with earthquake resistance as a fuel inlet/outlet machine. We provide facilities and facilities.

The present invention will be described in detail below based on illustrated examples.

2-, the same reference numerals as in FIG. 1 indicate the same members.

The illustrated fuel inlet/outlet machine 1 is different from that shown in FIG. 1, and only one coffin is mounted on the tower. Further, a relay cell 8 used for fuel transfer relay is formed under the floor surface of the pool side in alignment with the traveling route of the fuel inlet/outlet machine 1. The relay cell 8 is formed with a lower fuel passage 9 that penetrates the ceiling and opens to the running floor surface of the fuel inlet/output machine 1, and a lower fuel passage 9 that penetrates the floor surface of the relay cell 8 and opens below the water surface in the pool. Nine fuel cleaning devices 5 are installed directly below the lower fuel passage 10 and the upper fuel passage 6, respectively, and installed under the floor of the relay cell. Among these, the lower fuel passage IO is provided with a door pulp n at its upper end and a watertight connection mechanism 12 at its lower end for watertightly connecting it to an underwater fuel transfer device (i) to be described later. Furthermore, a relay cell fuel transfer device 13 is provided inside the relay cell 8 to transfer fuel between the cleaning device 5 and the lower fuel passage 10. As shown in the figure, this transfer machine is of a running cart type that runs on running rails 13 and K, so-called transfer rotor, and the fuel amount is lowered at the tip of a rotating arm that rotates on a horizontal plane. A transfer machine having a structure equipped with a mechanism may be adopted.

Next, the fuel transfer operation by the fuel transfer equipment having the above configuration will be explained in order. The fuel stored in the fine hood of the fuel inlet/outlet machine 1 and transferred is first connected to the door pulp of the upper fuel passage 9 through the fuel inlet/outlet machine 1, and then suspended through the passage 9 into the cleaning device 5 located directly below. be taken down. After cleaning here, it is then lifted up by a transfer machine in the relay cell and transferred to the lower fuel passage 10fi. On the other hand, in the pool, the underwater fuel transfer device 7 travels to just below the fuel passage 10 and is on standby with its fuel storage section connected to the watertight connection mechanism 12. In this state, door pulp 11 t-1111!
1. The fuel is delivered to the underwater fuel transfer device through the fuel passage 10. In this process, even if the door pulp 11 is opened, water from the pool will not enter the relay cell.

Next, the door pulp 11 is closed after disconnecting the fuel from the transfer machine of the relay cell. After that, the underwater fuel transfer machine 2 and the connection mechanism holder are separated, and the transfer machine γ is moved to the left, whereupon the fuel is delivered to the pool fuel transfer machine number, and finally it is placed in a predetermined position on the fuel storage rack 3. fart/? SD Unload and store. Note that the relay cell 8 is connected to the door pulp 9& of the upper fuel passage 9.
Therefore, the transfer stop installed in the relay cell, which is isolated from the outside, does not require a hollow structure such as the coffin 1a mounted on the fuel inlet/output machine 1.
It can be constructed as a simple transfer machine simply equipped with a fuel lifting mechanism and a fuel cooling device.

As described above, the present invention provides a fuel relay cell under the floor of the poolside, is equipped with a fuel cleaning device so that fuel can be directly suspended from the fuel inlet/output machine through the fuel passage, and is equipped with a fuel In order to receive and deliver the fuel to the underwater fuel transfer machine running in the fuel storage pool, a connection mechanism that can be watertightly connected to the underwater transfer machine is provided in the fuel passage that penetrates the floor of the relay cell. Inside the relay cell! A relay cell fuel transfer device is provided to receive and deliver fuel from the fuel cleaning device to the underwater transfer device through the fuel passage. Therefore, the fuel is transferred from the fuel inlet/output machine to the fuel cleaning device.) When pulling the IJum into the pool after cleaning, it is necessary to lift it above the water level of the pool, as in the conventional equipment shown in Figure 1. It can be pulled directly into the pool via the relay cell under the floor. This eliminates the need for the fuel inlet/output machine to have two coffins installed in the tower, unlike conventional equipment, which not only greatly reduces manufacturing costs, but also has advantages in terms of earthquake resistance. In addition, compared to conventional equipment, the degree of freedom in arranging equipment for the entire equipment is increased, so there is an advantage that the layout of the fuel transfer equipment within the limited fuel handling building is easier.

[Brief explanation of drawings]

FIG. 2 is a configuration layout diagram of an embodiment of the present invention. 1...Fuel loading/unloading machine, 2...Fuel storage pool, 4...
・Pool fuel transfer machine, 5... Fuel cleaning device, G...
Underwater fuel transfer device, 8... Relay cell, 9... Upper fuel passage, 10... Lower fuel passage, ■... Watertight connection mechanism, 13... Relay cell fuel transfer device.

Claims (1)

[Claims] 1) While maintaining a vertical posture between the fuel inlet/output machine that runs on the floor along the fuel transfer route between the reactor side and the fuel storage pool and the pool fuel transfer machine that runs in the fuel storage pool section. The reactor fuel transfer equipment, which receives and delivers fuel via the fuel cleaning device, is constructed under the floor of the poolside to nine relay cells, and passes through the ceiling of the relay cell to the running floor of the fuel loading/unloading machine. an upper fuel passage formed to open to the upper part of the fuel passage;
A fuel cleaning device is installed under the floor of the relay cell, aligned directly below the upper fuel passage, and a lower fuel cleaning device is installed below the floor of the relay cell to penetrate the floor of the relay cell and open below the water surface in the fuel storage pool. a relay cell fuel transfer machine disposed within the relay cell to transfer fuel between the fuel cleaning device and the lower fuel passage; and a relay cell fuel transfer machine that travels underwater in the pool to transfer fuel through the lower fuel passage. The submersible fuel transfer device is installed in the pool to receive and transfer fuel between the fuel transfer device and the pool fuel transfer device, and this connection mechanism connects the submersible fuel transfer device and the lower fuel passage in a seamless manner. A nuclear reactor fuel transfer facility characterized by the following features: