JPH02222891A - Fuel handling device of fast breeder reactor - Google Patents

Abstract

PURPOSE:To intened realization of an easy maintenance work by providing an in-cell rotary transfer machine which is attached to a rotary plug partitioning an inert gas cell and consists of a rotation driving device which drives a gripper and the like, and by transferring spent fuels by turning the rotary plug. CONSTITUTION:An in-cell rotary transfer machine 22 consists of a gripper arranged in an air cell, a gripper driving device 20, a rotary plug partitioning an inner gas cell 21 and a rotation driving device. The gripper grasps and lifts spent fuels from an outer fuel relaying tank 6. The lifted fuel is transferred to a fuel washing tank 30, within a cell 21, with a method turning the rotary plug by the rotation driving device. This fuel is transferred to a fuel transfer tube 31 and is furthermore transferred to a submersed storage tank 9 by a submersed storage loading cart 10. The transferred fuel is lifted by a jib crane 33 for a cask lid handling, and is loaded to a cask loading cart 15. The cell 21 is partitioned by a rotary plug and a part above the rotary plug is an air cell 34. Maintenance and mending works of a transfer machine 22 are performed by the gripper, which is driven by a device 20, with a door valve being shut.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a fuel handling device for a fast breeder reactor that cleans spent fuel taken out from a reactor vessel of a fast breeder reactor and transfers it to an underwater fuel storage rack.

[Conventional technology]

FIG. 6 is a schematic diagram showing a conventional fuel handling device for a fast breeder reactor. Such a fuel handling device for a fast breeder reactor is described in Japanese Patent Application Laid-Open No. 61-235596. In FIG. 6, the fuel was removed from the core 2 by a refueling machine 3. After the spent fuel is stored in the in-core fuel storage rack 4 provided inside the reactor vessel 1 to reduce the decay heat level, it is taken out from the reactor vessel 1 by the fuel inlet/output machine 5 and transferred to the out-of-core fuel relay. The spent fuel taken out through the tank 6 is transported by an in-cell crane 7 through an inert gas cell 21 filled with inert gas to prevent reaction of adhering sodium to a fixed fuel cleaning device 16 installed under the cell floor. The uke is handed over and washed. The spent fuel that has been cleaned is transferred by the in-cell fuel elevator 17 to the underwater transfer device 18 located directly below the fuel cleaning device 16, and further transferred to the water pool transfer device. Thereafter, the spent fuel is transferred from the underwater transfer device 1 to the underwater fuel storage tank 9 by the pool transfer device 2o installed above the water boule 19, and is stored until it is transported to the reprocessing plant. In addition, the procedure for transporting spent fuel to the reprocessing plant is that after several pieces of spent fuel are stored in the cask inner container 11 from the underwater fuel storage tank 9 by the pool transfer machine 20, the cask inner container is transported using the cask inner container handling hoist 12. The receiver is handed over to 13 and carried to the port facilities.

[Problem to be solved by the invention]

In the conventional device, the in-cell crane 7 is used to transfer the fuel within the inert gas cell 21, but there are the following problems. i) The in-cel crane 7 is located inside an inert gas cell 21 that cannot be accessed by humans, and for maintenance and repair of the in-cel crane 7, a dedicated repair cell should be provided, or
Alternatively, it is necessary to draw it out of the inert gas cell 21 using a cask. ii) When a dedicated capture cell is provided, it is necessary to provide a partition door between the inert gas cell 21 and the repair cell, and equipment to replace the inert gas and air in the repair cell is also required. Large-scale equipment is required. iii) When pulling out the inert gas cell using a cask, it becomes difficult to handle cables inside the inert gas cell during pulling out and restoration. The present invention was made to solve the problems of the prior art, and provides a fuel handling device for a fast breeder reactor in which the drive device is easy to maintain, or an inert gas cell penetrating portion and a rotating device in which the drive device is easy to maintain. It is an object of the present invention to provide a fuel handling device for a fast breeder reactor whose parts are reduced.

[Means to solve the problem]

The above object includes an intra-cell rotary transfer machine that is attached to a rotary plug that partitions an inert gas cell, and includes a gripper disposed in an air cell, a gripper drive device, a door valve, and a rotary drive device that drives the rotary plug; This is achieved by a fast breeder reactor fuel handling system configured to rotate the rotating plug within an inert cell and transfer the spent fuel to a fuel cleaning tank and a fuel transfer pipe. Furthermore, it supports a rotating shaft that passes through the inert gas cell, a guide tube supported by the rotating shaft via an offset arm, a gripper that moves up and down within the rotating shaft and the guide tube, and a gripper cable that lifts or suspends this gripper. a link that guides the link, a guide rail that guides the link, a blocking plug that is disposed within the rotating shaft and that allows the gripper cable to pass through, a rotational drive device that is disposed within the air cell that drives the rotating shaft, and a rotational drive device that is disposed within the air cell that drives the rotating shaft; an extra-cell rotationally driven fuel transfer device consisting of a gripper drive device arranged in the inert gas cell, the extra-cell rotationally driven fuel transfer device being rotated within the inert gas cell to transfer the spent fuel to a fuel washing tank and a fuel transfer pipe; It is preferable to use a fast breeder reactor fuel handling system configured to transfer the fuel to a fast breeder reactor. In addition, the link supporting the gripper cable is multi-jointed, and the link is raised and lowered along a guide rail, and the shielding plug, the link, and the gripper are integrated so that they can be taken in and out of the rotating shaft. It is preferable to use a device.

[For use]

The gripper drive device and rotary drive device for rotational transfer within the cell are located in the air cell above the rotating plug that partitions the inert gas cell, so maintenance and repair of these drive devices can be carried out using air without coming into contact with inert gas. It can be done safely inside. In addition, the gripper drive device and rotation drive device of the out-of-cell rotation drive type fuel transfer device are arranged in an air cell separated from the inert gas cell, so that the gripper, link, and shielding plug can be taken out as a unit from the rotation shaft. Therefore, maintenance and repair of these drive devices can be performed safely in the air without coming into contact with inert gas. If an extra-cell rotary drive type fuel transfer device is used, fuel can be transferred within an inert gas cell by rotating a rotating shaft and a guide tube.

【Example】

The present invention will be described in detail below based on the drawings. FIG. 1 is a schematic diagram of a fuel handling system for a fast breeder reactor according to an embodiment of the present invention, and FIG. 2 is a diagram of an intra-cell rotary transfer device of the fuel handling system of FIG. In FIGS. 1 and 2, the same parts as in FIG. 3 are given the same numbers. After the spent fuel taken out from the reactor core 2 is stored in an in-core fuel storage rack 4 provided in the reactor vessel 1 to reduce the decay heat level, it is taken out from the reactor 1 by a fuel inlet/output machine 5. , and transferred to the out-of-core fuel relay tank 6. The intra-cell rotary transfer machine 22 includes a gripper 23. arranged within the air cell. Gripper drive device 25 for driving the gripper.
A door valve 26 , a blower 29 , and a rotary plug 27 that partitions the inert gas cell 21 . A rotary drive device 28 that drives the rotary plug 27 and is disposed within the air cell is provided. The spent fuel 24 is grabbed and pulled up from the extra-core fuel relay tank 6 by the gripper 23 of the in-cell rotary transfer machine 22. The gripper 23 is driven by a gripper drive device 25 and cools the spent fuel 24 by a blower 29 . The pulled up fuel 24 is transferred to a rotary plug 27 by a rotary drive device 28.
The fuel is transferred to the fuel cleaning tank 30 within the inert cell 21 by rotating the fuel. The cleaned fuel 24 is transferred to the fuel transfer pipe 31 by rotating the rotary plug 27, and further transferred to the underwater storage tank 9 by the underwater storage truck 10. The fuel transferred from the underwater storage tank 9 by the underwater truck 10 is lifted by a cask lid handling jib crane 33 and loaded onto the cask truck 15. The inert gas cell 21 is partitioned by a rotating plug 27, and an air cell 34 is formed above the rotating plug 27. Maintenance and repair of the intra-cell rotary transfer device 22 can be easily performed by driving the gripper 23 with the gripper drive device 2o and closing the door pulp 26. The present invention can also be applied to a device in which the fuel cleaning tank 3° and the fuel transfer pipe 31 are integrated as shown in FIG. FIG. 3 is a schematic configuration diagram of a fuel handling device for a fast breeder reactor according to another embodiment of the present invention, FIG. Maintenance of the out-of-cell rotary drive fuel transfer machine shown in the figure. FIG. 3 is a diagram showing the order of work during repair. In FIGS. 3 and 4, the same parts as in FIG. 1 are given the same numbers. The spent fuel taken out from the reactor core 2 is stored in an in-core fuel storage rack 4 installed adjacent to the reactor core 2 to reduce decay heat and radiation levels, and then transported from the reactor vessel 1 by a fuel inlet/output machine 5. It is taken out to the outside and transferred to the out-of-core fuel relay tank 6. The extra-cell rotationally driven fuel transfer device 44 is connected to the inert gas cell 2.
1 and a rotating shaft 35 passing through the air cell 34, this rotating shaft 3
Guide tube 3 supported by offset arm 36 at
7. Gripper 23 that moves up and down within the rotating shaft 35 and guide tube 37, a link 38 that supports the gripper cable 41 that lifts or suspends this gripper 23 and is bendable with multiple joints, and guides when pulling out and inserting this link 38 a guide rail 40″ for performing the rotation, a shielding plug 39 disposed within the rotary shaft 35 through which the gripper cable 41 passes, a rotary drive device 28 disposed within the air cell and driving the rotary shaft 35 and the shield plug 39, and an air cell 34. a gripper drive 25 disposed within the air cell 34 and a cooling blower 2 disposed within the air cell 34 forming a closed loop with the inert gas cell 21;
It consists of 9. From the extra-core fuel relay tank 6 to the extra-cell rotationally driven fuel transfer device 44
The spent fuel 24 is grabbed and pulled up by the gripper 23. The pulled up fuel 24 is transferred to a rotary drive device 25
After being transferred and positioned within the inert gas cell 21 by rotating the rotating shaft 35, the gripper 23
is lowered and suspended into the fuel cleaning tank 30. The fuel 24 cleaned in the fuel cleaning tank 30 is again handled in the same manner by the extra-cell driven fuel transfer device 36 and transferred to the fuel transfer pipe 31. Further, the fuel is transferred from the fuel transfer pipe 31 to the underwater fuel storage tank 9 by the underwater truck 10. Inert gas cell 21 and air cell 3
Only the rotating shaft 35 passes through the cell 4, and when performing maintenance or repair of the external-cell rotationally driven fuel transfer device 44, the air cell 34, gripper drive device 25, etc. must be removed as shown in FIG. By attaching the lifting jig 42 and lifting it up with the crane 14, the gripper 23, link 38, and shielding plug 39 connected by the gripper cable 41 can be simultaneously pulled out and repaired within the air cell 34. Figure 5(a) shows the state in which the hanging jig 42 is attached to the shielding plug 39, and Figure 5(1)) shows the state in which the hanging jig 42 etc. are hung by a crane with a repair bag covered. FIG. 5(C) is a diagram showing a state in which the gripper is further lifted up, and FIG. 5(d) is a diagram showing a state in which the gripper is completely lifted up from the rotating shaft. As shown in FIGS. 5(a) to 5(d), the shielding plug 39. is bent so that the link 39 is bent, eliminating the need for wasted space above and below. Link 38 and gripper 23 can be pulled out. When inserting the gripper 23 into the rotating shaft and guide tube 37,
Do this in reverse order. In addition, as shown in Figure 5, maintenance,
Shielding plug during repair 39. If the repair bag 43 is used to partition the inert gas cell 21 and the air cell 34 when removing and inserting the link 38 and the gripper 23, there is no need to use a door valve.

【Effect of the invention】

According to claim 1 of the present invention, the inert gas cell is partitioned by the rotary plug of the intra-cell rotary transfer device, and the gripper drive device and the rotary drive device are arranged in the air cell, so maintenance and repair of these drive devices can be easily performed. can. Therefore, a dedicated repair machine is not required, and the arrangement of the fuel transfer system can be made compact. According to claim 2 of the present invention, the rotational drive device and gripper drive device of the extra-cell rotationally driven fuel transfer device are disposed within the air cell, and the gripper, link and shielding plug can be taken out as a unit from the rotating shaft. Since I configured it as
Maintenance of these devices. Repairs can be made easily. Furthermore, since the rotary plug is not required and the rotating shaft and guide tube are configured to rotate, the amount of material in the rotating part can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a fuel handling device for a fast breeder reactor according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an intra-cell rotary transfer device of the fuel handling device shown in FIG. 1, and FIG. Schematic configuration diagram of a fuel handling device for a fast breeder reactor according to another embodiment, No. 4
The figure is a block diagram of the extra-cell rotary drive type fuel transfer device shown in FIG. Figure 5 (a) is a diagram showing the state in which the lifting jig is attached, Figure 5 (b) is a diagram showing the state in which the lifting jig 42 etc. is hung by a crane with a repair bag covered, and Figure 5 (C) is Diagram showing the state during lifting, No. 5
FIG. 6(d) is a diagram showing a state in which the gripper is completely lifted from the rotating shaft, and FIG. 6 is a schematic diagram of a conventional fuel handling device for a fast breeder reactor. 1: Reactor vessel, 2: Reactor core, 4: In-reactor fuel storage rack,
9; Underwater fuel storage tank, 21: Inert gas cell, 23 Nigelippa, 24: Spent fuel, 25 Nigelippa drive device,
26: Door valve, 27: Rotating plug, 28 Two-rotation drive device, 30: Fuel cleaning tank, 3I: Fuel transfer pipe, 34: Air cell, 35: Rotating shaft, 36: Offset arm, 37
: Guide tube, 38: Link, 39: Shiyahei plug, 40
Ni-guide rail, 44: Out-of-cell rotationally driven fuel transfer device.

Claims (1)

[Claims] 1) Spent fuel taken out from the reactor core is stored in an in-core fuel storage rack provided in the reactor vessel to reduce the decay heat level, and then taken out from the reactor vessel. In the fuel handling equipment of a fast breeder reactor, the fuel is cleaned, further stored in an underwater fuel storage tank, and then transported to a reprocessing plant. An intra-cell rotary transfer device includes a gripper drive device, a door valve, and a rotary drive device that drives the rotary plug, and rotates the rotary plug within the inert gas cell to transfer the spent fuel to a fuel cleaning tank and a fuel transfer pipe. A fuel handling device for a fast breeder reactor, characterized in that the fuel handling device is configured to be transferred to a fast breeder reactor. 2) After the spent fuel taken out from the reactor core is stored in an in-core fuel storage rack installed inside the reactor vessel to reduce the decay heat level, it is taken out of the reactor vessel and cleaned, and further submerged in water. In a fuel handling device for a fast breeder reactor that stores fuel in a storage tank and then transports it to a reprocessing plant, a rotating shaft passing through an inert gas cell, a guide tube supported by the rotating shaft via an offset arm, and a rotating shaft are provided. A gripper that moves up and down within the shaft and the guide tube, a link that supports a gripper cable that lifts or suspends this gripper, a guide rail that guides this link, a shielding plug that is disposed within the rotating shaft and allows the gripper cable to pass through, and the An extra-cell rotationally driven fuel transfer device includes a rotational drive device disposed within an air cell to drive the rotation shaft and a gripper drive device disposed within the air cell, A fuel handling system for a fast breeder reactor, characterized in that the spent fuel is transferred to a fuel cleaning tank and a fuel transfer pipe by rotating a driven fuel transfer device. 3) In the fuel handling device for a fast breeder reactor according to claim 2, the link supporting the gripper cable is multi-jointed, and the link is raised and lowered along a guide rail, and the shielding plug, the link, and the gripper are rotated as a unit. A fuel handling device for a fast breeder reactor characterized by being configured such that it can be taken in and out from the shaft.