JPH0321519Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nuclear fuel insert handling tool having a gripper drive.

[Prior Art] During the shutdown of a nuclear power plant, a spent fuel assembly is taken out of the reactor and stored in a spent fuel rack in a spent fuel pit, and for example, control rod assemblies in the fuel assembly are removed from the reactor and stored in a spent fuel rack in a spent fuel pit. Shuffling of inserts such as thimble plug assemblies, neutron sources, etc. is performed using handling tools.

Conventionally, the outer shell of the handling tool used for this work was
As shown in the figure, it consists of a cylindrical housing 1, a guide base 3, etc., and a gripper (not shown) that grasps the above-mentioned insert and moves up and down is built into the cylindrical housing 1, and a drive device for the outer shell and the gripper. 5 through a connecting pipe 4, each cylindrical housing 1 is connected through a flange 6, and the cylindrical housing 1, connecting pipe 4, and guide base 3 are also connected through a flange 6.
This is a configuration that is connected by . A guide pin 8 for inserting into a hole in the upper nozzle of a fuel assembly (not shown) to guide a handling tool onto the fuel assembly and one positioning pin 7 for positioning are fixed to the guide base 3. ing.

The handling tool is moved by suspending the gripper drive device 5 from a hook 9 of a pit crane. The handling tool has a weight of approximately 800 kg, and when positioning the handling tool on the fuel assembly, if the handling tool is placed directly on the fuel assembly, it will exceed the allowable axial load of the fuel assembly, so a tool guide (not shown) is required. was placed on the rack cell of the spent fuel rack, and then handling tools were placed on the tool guide.

[Problems to be solved by the invention] Therefore, in the conventional technology using a tool guide, positioning the tool guide requires about half of the total shuffling operation time for one fuel assembly, and this There was a problem that took up a large proportion of the total work time. The present invention aims to quickly solve these problems.

[Means for Solving the Problems] For this purpose, the present invention provides a nuclear fuel insert handling tool having a cylindrical housing and a drive device for a gripper housed in the housing, in which a tool for handling a nuclear fuel insert is provided, in which the lower end of the housing is is characterized in that a guide member that engages with the lux cell is provided hanging down from the lower end.

[Operation] The handling tools are suspended by a pit crane and moved onto the rack cell of the spent fuel rack. next,
When the handling tool is gradually lowered, a guide member provided at the lower end of the cylindrical housing of the handling tool engages the rack cell, and the weight of the handling tool is supported by the rack cell. Therefore, unlike the prior art, it is not necessary to separately place a tool guide on the lux cell each time, and the shuffling operation time is shortened.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or corresponding parts.

FIG. 1 shows an overall view of the handling tool according to the present invention, and the outer shell of the handling tool includes a cylindrical housing 1,
Consists of guide plate 2, guide base 3, etc.
A gripper (not shown) is built in the cylindrical housing 1 to grasp the above-mentioned insert and move up and down, and the gripper can be connected to a drive device as shown in FIG. 4 via a connecting pipe 4. , each cylindrical housing 1 is connected by a flange 6, and the cylindrical housing 1, connecting pipe 4 and guide base 3 are also connected by a flange 6.
are connected with. The guide base 3 includes a guide base 3, which is inserted into the hole of the upper nozzle of the fuel assembly and guides the handling tool over the fuel assembly, as will be described later.
A book guide pin 8 and one positioning pin 7 (see FIG. 3) for positioning the book are fixed. A guide plate 2 inserted at strategic points in the cylindrical housing 1 is provided with holes through which grippers and nuclear fuel inserts can be passed.

A plurality of plate-shaped tool guide members 12 are suspended and fixed to the lower end of the cylindrical housing 1, more specifically, to the lower surface of the lowermost guide base 3.

That is, as can be understood from FIGS. 2 and 3, in this embodiment, the cylindrical housing 1
is formed in the same shape as the Luxel 10, which has a rectangular cross section, and a total of four guide members 12, one on each side of the rectangle, hang down from the lowermost guide base 3 and move as appropriate. It is attached by means of The inner wall of each guide member 12 has an inclined surface 12a at the tip to facilitate guiding of the handling tool, and also has a stepped portion 12b at a relatively upper portion to stabilize engagement with the lux cell 10. .

Now, the above-mentioned handling tool is hoisted up by the hook 9 of the pit crane as shown in FIG. A guide pin 8 and a positioning pin 7, which are lowered while being guided by a tool guide member 12 and are simultaneously fixed to the lowermost guide base 3, are formed in the upper nozzle 11a of the fuel assembly 11 housed in the rack cell 10. The handling tool is inserted into the hole that is not
The fuel guide 10 of the lux cell 10 is
It is placed on a. At this stage, a gripper (not shown) built into the cylindrical housing 1 of the handling tool is lowered, grips the nuclear fuel insert (not shown) of the fuel assembly 11, and then the insert is pulled into the housing 1, or The insert contained in the housing 1 can be inserted into the fuel assembly 11 to perform the necessary replacement work.

[Effects of the invention] As described above, according to the invention, since the tool guide member is provided on the handling tool itself, the number of man-hours associated with the conventionally used tool guide is reduced, and the fuel assembly The time for positioning the handling tool upwards is shortened, resulting in a significant reduction in the shuffling operation time.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the overall structure of the handling tool according to the present invention, Fig. 2 is a side view partially showing the handling tool of Fig. 1 placed on the fuel guide of the Luxel, and Fig. 3 is a cross-sectional view showing the handling tool of the present invention. FIG. 2 is a sectional view taken along line A-A in FIG. 2, and FIG. 4 is a side view showing an outline of a conventional handling tool. 1... Cylindrical housing, 5... Drive device, 10
...Ratuxel, 12...Guidance member.

Claims (1)

[Scope of utility model registration request] A nuclear fuel insert handling tool having a cylindrical housing and a gripper drive device housed within the housing, the lower end of the housing having:
A tool for handling a nuclear fuel insert, characterized in that a guide member that engages with the lux cell is provided depending from the lower end.