JPH053919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fuel address measuring jig for measuring the fuel position, that is, the fuel address, of a fuel assembly in a nuclear reactor.

[Technical background of the invention and its problems]

FIG. 3 shows a state in which fuel is being exchanged in a boiling water reactor.

In a boiling water reactor, the reactor pressure vessel 1
A plurality of fuel assemblies 3 are arranged and arranged in a reactor core 2 inside the reactor core 2, separated into sections by an upper lattice plate 4.
When replacing the fuel assembly 3, the upper cover (not shown) of the reactor pressure vessel 1 is removed, the reactor well 5 and the fuel storage pool (not shown) are filled with water, and the fuel exchanger 6 is inserted into the reactor well 5 and the fuel storage pool (not shown). Then replace the fuel assembly 3. This fuel exchanger 6 includes a traveling trolley 8 that moves back and forth on a pair of rails (not shown) laid on the operation floor 7 along the reactor pressure vessel 1 and the fuel storage pool (not shown). , rails (not shown) provided on this traveling trolley 8
It is formed by a traversing truck 9 that traverses above in a direction perpendicular to the moving direction of the traveling truck 8, and a mast 10 suspended from the traversing truck 9. This mast 10 is formed into a telescopic shape by a plurality of cylindrical pipes containing air cylinders, and is configured to be expandable and retractable. A pneumatically operated fuel gripping device 11 is received at the lower end of this mass 10, and when compressed air is sent to the fuel gripping device 11, a hook is operated to grip the fuel assembly.

When transferring the fuel assembly 3, the fuel exchanger 6 is moved back and forth and left and right in a horizontal plane, while the mast 10 is extended and contracted and moved up and down to automatically move the fuel gripping device 11 in three dimensions. The fuel assembly 3 is transferred in a fixed manner, and the fuel assembly 3 is transferred.

When replacing the fuel assembly 3 installed in the core 2, the fuel exchanger 6 is moved to the mounting device of the fuel assembly 3, that is, the fuel address, and then,
Lowering the mast 10, the fuel grasping device 1 at the lower end
1 grips the fuel assembly 3, and then the mast 1
0 and pull out the fuel assembly 3. When inserting the fuel assembly 3 into the reactor core 2, the fuel assembly 3 is suspended by the fuel gripping device 11 with the mast 10 contracted, the fuel exchanger 6 is moved to the fuel address, and then The mast 10 is expanded and contracted to insert the fuel assembly into the reactor core 2.

However, if the insertion of the fuel assembly 3 into the target fuel address is incorrect, the mast 10 is once raised to a predetermined height, and then the position of the fuel exchanger 6 is corrected in the longitudinal and lateral directions. The operation of inserting the fuel assembly 3 into the target fuel address again had to be repeated. Moreover, this work inside the reactor is performed while looking into the inside of the reactor pressure vessel 1 through the shaking reactor water surface from above the fuel exchange machine 6, so it is difficult to see inside the reactor pressure vessel 1 and it is difficult to confirm the target fuel address. As a result, problems such as reduced work efficiency and poor work safety have arisen.

[Purpose of the invention]

The present invention has been made in view of these points, and it is possible to easily detect and confirm the fuel address in the core of a nuclear reactor, and to smoothly replace the fuel assembly using a fuel exchanger. The object of the present invention is to provide a fuel address measuring jig that can be used to measure fuel addresses.

[Summary of the invention]

The fuel address measuring jig of the present invention is provided with a holding handle that is detachably held by a fuel gripping device on the upper part of the jig body, and the handle part of the fuel assembly is inserted into the lower part of the jig body and pulled out. An opening that freely opens downward is provided, and a lever is provided that vertically passes through the jig body from the opening to the holding handle, and is movable up and down, and this lever is used to move the fuel assembly inserted into the opening. The device is characterized in that it is set to be pushed up by the handle portion of the fuel gripping device to activate the landing detector of the fuel gripping device.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2 show a fuel address measuring jig 12 gripped by a fuel gripping device 11. FIG. This fuel address measuring jig 12 has a jig main body 13 consisting of a plate-shaped plate 14 and a guide 15, and a gate formed in the same shape as the handle of the fuel assembly is provided on the upper part of the jig main body 13. A handle 16 for holding the shape is integrally provided in a protruding manner. The holding handle 16 is connected to the hook 25 of the fuel gripping device 11 attached to the lower end of the telescoping mast 10 (see FIG. 3).
It is gripped by operating it via the actuating rod 24. After gripping the holding handle 16 of the fuel address measuring jig 12 with the hook, for example, rotate the four fixing bolts 23 to bring the bolt heads into contact with the fuel gripping device 11, thereby holding the fuel address measuring jig 12. Tighten and secure. The fixing bolt 23 is screwed onto the top of the jig body 13.

Further, an opening 17 that expands downward is formed inside the guide 15 of the jig main body 13, and a handle (not shown) of a fuel assembly is inserted and guided through this opening 17. A lever 18 is provided that passes through the plate 14 and the upper end beam portion of the holding handle 16 and is movable up and down. This lever 18 is connected by means of two connecting rods 19 passing through the plate 14 and the upper end beam of the holding handle 16. It is connected to the rod 20 and is always elastically pressed downward by a compression spring 22 interposed between the plate 14 and the lower horizontal rod 20.

On the other hand, the fuel gripping device 11 is provided with a limit switch 28 constituting a landing detector.
A connecting rod 29 is slidably installed opposite to the limit switch 28. This connecting rod 29 is
It is integrally coupled with a sliding pin 30 provided opposite to the lever 18, and by upward movement of this pin 30,
The connecting rod 29 is lifted and the limit switch 28
It is starting to operate.

Next, the operation of this embodiment will be explained.

To measure the fuel address, the fuel address measuring jig 12 of this embodiment is attached to the fuel gripping device 11 as shown in FIGS. 1 and 2. To do this, first, as shown in FIG.
, and rotate the hook 25 clockwise around the pivot pin 26 to open the lower opening 27 into which the holding handle 16 of the fuel address measuring jig is inserted.
to be opened. After inserting the holding handle 16 into the lower opening 27, the operating rod 24 is lowered and the hook 25 is rotated counterclockwise.
The holding handle 16 is engaged with the hook 6 and is gripped. Thereby, the fuel address measuring jig 12 can be attached to the fuel gripping device 11. After that, each fixing bolt 23 is rotated so that the jig main body 1
3 and the fuel gripping device 11, and the fuel address measuring jig 12 is integrally fixed to the lower end of the fuel gripping device 11.

In this fixed state, the fuel exchanger 6 is connected to the reactor core 2.
After that, the mast 10 is extended to lower the fuel address measuring jig 12, and the handle of the fuel assembly 3 is moved to the guide 15 of the jig body 13.
into the opening 17 of. Then, the lever 18 is raised by the handle of the fuel assembly 3 against the elasticity of the spring 22, and the fuel gripping device 11 is raised.
The pin 30 attached to the pin 30 is pushed up, the connecting rod 29 integrally connected to the pin 30 is raised, and the limit switch 28, which serves as a landing detector, is activated.
Then, the position where the limit switch 28 is turned on is stored in the fuel exchanger 6 as the fuel address of the fuel assembly 3. This fuel address detection and storage is performed for each fuel assembly 3.

Thereafter, the mast 10 is retracted, the fuel address measuring jig 12 is removed from the fuel gripping device 11 by an operation opposite to that described above, and the mast 10 is then extended at the fuel address memorized as described above. As the fuel assembly 3 is lowered, the handle of the fuel assembly 3 is surely inserted into the lower opening 27 at the lower end. Thereafter, the fuel assembly 3 is suspended by the hook 25 and a predetermined fuel exchange operation is performed.

As described above, according to this embodiment, the fuel address can be accurately detected and stored with a simple operation, and the fuel assembly can be reliably gripped without malfunctioning during fuel exchange.

Further, in this embodiment, the outer circumferential surface of the guide 15 is formed to a size that fits into the upper opening of the fuel storage rack (both not shown), and the outwardly projecting portion 14a of the plate 14 is Since it is formed as a stopper that engages with the upper surface of the fuel storage rack, the fuel address of the fuel storage rack can also be accurately measured, and the spent fuel assembly 3 can be stored in the fuel storage rack reliably and quickly. Something will happen.

〔Effect of the invention〕

Since the fuel address measuring jig of the present invention is configured and operates in this manner, it is possible to easily detect and confirm the fuel address in a nuclear reactor, and to reliably and quickly remove fuel assemblies using a fuel exchanger. It also has the advantage of being able to be carried out smoothly.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the fuel address measuring jig of the present invention, and Fig. 2 is a -
FIG. 3 is a schematic cross-sectional view of the nuclear reactor showing the refueling machine. DESCRIPTION OF SYMBOLS 11... Fuel gripping device, 12... Fuel address measuring jig, 13... Jig body, 16... Holding handle, 17... Opening, 18... Lever, 28...
...limit switch.

Claims (1)

[Scope of Claims] 1. A holding handle that is detachably held by a fuel gripping device is provided in the upper part of the jig body, and a handle part of the fuel assembly is provided in the lower part of the jig body so that it can be freely inserted and pulled out. A lever is provided that vertically passes through the jig body from the opening to the holding handle, and is movable up and down, and this lever is connected to the handle of the fuel assembly inserted into the opening. 1. A fuel address measuring jig, characterized in that the jig is configured to be pushed up by a portion to activate a landing detector of the fuel gripping device. 2. The fuel address measuring jig according to claim 1, wherein the jig main body is formed in a shape to engage with the upper end opening of the fuel storage rack.