JPS61116690A - Assembling device for fuel aggregate - 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 [Field of Industrial Application] The present invention relates to a fuel assembly assembly apparatus for assembling a fuel assembly by drawing fuel and rods into a skeleton assembly.

[Prior art]

Fuel assemblies are used in pressurized Mercury light water reactors currently in use. As shown in FIG. 15, this fuel assembly includes an upper nozzle L and a lower nozzle 2 which are arranged vertically apart, and a predetermined interval between them,
A plurality of support grids 3 having grid spaces (referred to as cells) formed by straps, which are inserted into the cells of the support grid 3 at predetermined intervals and fixed by the fixing portions of the support grid 3, and A control rod guide tube 4 whose upper and lower ends are connected to an upper nozzle 1 and a lower nozzle 2, and a large number of fuel pellets 6 sealed inside the cladding tube 5 by welding end plugs 8& to both ends of the cladding tube 50. The fuel rod 8 has a pressing spring 7, is inserted into a predetermined cell of the support lattice 3, and is elastically supported by the support portion of the support lattice 3.

To assemble a fuel assembly, first, the support grids 3 are arranged in parallel at predetermined intervals, and after inserting a plurality of control rod guide tubes 4 into predetermined cells of the support grids 3, they are controlled by a tube expansion jig. The rod guide tube is expanded and fixed to the support grid 3 to form a skeleton assembly 9. Then, the supporting grid 3 of the skeleton assembly 9 is assembled using a fuel assembly assembly device.
After drawing the fuel rod 8 into a predetermined cell, the control rod guide tube 4
The lower nozzle 2 is attached to the lower part, and the upper nozzle 1 is attached to the upper part.

By the way, in order to assemble the fuel assembly, it is necessary to apply the Mihara Sho 58, which was previously filed by the same applicant as the applicant of the present invention.
-28860 can be used. This K will be briefly explained with reference to FIGS. 14 and 15.

In FIG. 14, 10 is a fuel rod magazine that stores fuel rods 8 vertically and horizontally, 1 is an assembly stand that holds the skeleton assembly 9, and 12 is a fuel rod retractor.

This fuel rod puller 12 is provided with a first drive mechanism 13.
A moving table 14 that moves in the left-right direction in FIG. 4 is provided. This moving table 14 includes a plurality of fuel rod pulling tools 1.
5 is detachably attached.

Said fuel rod retractor 12#-! , a retractable rod holding pin provided on the movable table 14 so as to be movable up and down (for manual vertical movement of the length not shown) and manual operation of a lock bin (not shown) for locking this retractable rod holding pin in a predetermined position. Alternatively, the moving table 141C selectively moves the fuel rod retracting tool 15 located at a position opposite to the fuel rod 8 to be retracted into the skeleton assembly 9 and the fuel rod retracting tool 15 located at a position opposite to the fuel rod 8Vc that does not need to be retracted. It has been busy so that it can be fixed.

[Problem that the invention seeks to solve]

In the fuel assembly assembly apparatus as described above, the fuel rod retracting tool 15 is selected at a position opposite to each of the fuel rods 8 to be retracted into the skeleton assembly 9 and the fuel rods 8 that do not need to be retracted. Everything is done manually, that is, the drawing rod holding pin and locking pin must be manually operated for each fuel rod drawing tool 15, and this operation and confirmation of the selection result of the fuel rod drawing tool 15 requires Because these tasks are time-consuming, these tasks always have to be done in pairs, and the effort and time spent on these tasks is enormous.

Therefore, the present invention automates the selection of the operation of the fuel rod retracting tool that faces the fuel rods to be retracted into the skeleton assembly and the fuel rods that do not need to be retracted, and
It is an object of the present invention to provide a fuel assembly assembly device that can save the labor and time spent on the manual selection work and greatly improve the efficiency of drawing fuel rods into a skeleton assembly.

[Means for solving problems]

A plurality of fuel rods are attached to a movable stage that is movable in the axial direction of the fuel rods to a fuel rod retracting machine. A fuel assembly assembly device in which a fuel assembly is pulled out using a rod pulling tool and placed at a predetermined location within a skeleton assembly includes a tubular pull rod, an inner rod slidably inserted within the pull rod within a predetermined range, and a fuel assembly provided at the tip of the pull rod. the fuel rod retracting tool comprising a fuel rod attachment/detachment mechanism; and a recess provided in one of the fuel rod retracting tool and the movable table, and a retainer provided in the other is biased to be removable. the movable base and the fuel rod retracting tool are automatically engaged within a predetermined resistance force against relative movement between the movable base and the fuel rod retracting tool; In some cases, the pull rod is moved by a lock mechanism that automatically releases these engagements, a stopper mechanism provided on the puller and capable of engaging and disengaging from a predetermined inner rod, and a drive mechanism provided on the movable table. a fuel rod attachment/detachment mechanism operating mechanism that is movable in the axial direction and that engages and disengages the inner rod to move the inner quad relative to the pull rod; a movable table drive mechanism; a drive mechanism provided on the movable table; and a stopper. It is equipped with a control mechanism for controlling the mechanism and the like.

[For production]

Remove the stopper from the inner rod inserted into the pull rod located opposite the fuel rod that should be drawn into the skeleton assembly, and then remove the stopper from the inner rod inserted into the pull rod located opposite the fuel rod that does not need to be drawn into the skeleton assembly. When the moving platform is moved toward the fuel rod magazine side with the stopper engaged, the pull rods facing the fuel rods that do not need to be drawn into the skeleton assembly remain stopped and the engaging bodies are removed from the recesses, causing the rods to be pulled into the skeleton assembly. Only the pull rod facing the fuel rod passes through the skeleton assembly, and if the pull rod gets caught on the way, the engaging body automatically releases from the recess, leaving that pull rod in place, and the other pull rods are connected to the end plugs of the fuel rods. The fuel rod attachment/detachment mechanism operates to connect the fuel rod and the pull rod. In this state, the moving table moves from the fuel rod magazon to the fuel rod pulling machine side, and moves the fuel rod to a predetermined position inside the fuel rod magazon. The fuel rods are pulled by the pull rods into predetermined cells of the support grid of the skeleton assembly, the movable stage moves to a predetermined position and then stops once, and the fuel rod attachment/detachment mechanism operates again to remove the skeleton assembly. The fuel rod that has been drawn into the assembly is disconnected from the pull rod, and the movable stage is moved again to a position where the pull rod selection mechanism operates and moves to the next fuel rod retracting position. At this time, the engaging body is fitted into the recess.

〔Effect of the invention〕

It is possible to automate the selection of the actuation of the fuel rod retracting tool for the fuel rods to be retracted into the skeleton assembly and for the fuel rods that do not need to be retracted, thereby saving the effort and time spent on this type of selection work by manual operation. This greatly improves the efficiency of drawing fuel rods into the skeleton assembly, resulting in greater labor savings.
Furthermore, the automation can be achieved with a simple structure, which is economical.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 12. In this embodiment, the same parts as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted. Reference numeral 21 in FIGS. 1 to 6 is a frame-shaped movable base, and this movable base 21
A space 21a is formed inside. The recess (not shown) formed on the lower surface of the moving table 21 is fitted into two rails (not shown) K provided horizontally and parallel to the fuel rod retractor 12, as shown in FIG. It is said to be able to move freely in the directions of arrows A and B. Further, both ends of wire ropes 22 are attached to both left and right sides of the moving table 21 in the figure. This wire rope 22 is wound around a pulley 23 attached to the fuel rod puller 12. Further, a part of the wire rope 22 is connected to a drive mechanism 13&C, and the drive mechanism 13IC allows the movable table 21 to be moved in the left-right direction in FIG. 6 via the wire rope 22. Note that the moving table 21 has a U-shaped bridge 24 provided on its upper surface.

Further, a large number of fuel rod retracting tools 25 are connected to the movable table 21 .

In FIG. 7, the fuel rod retracting tool 25 consists of a pull rod 26 and an inner rod 27. The pull rod 26 connects the guide tube 28 and the guide tube 2.
The finger 29 is detachably connected to the tip of the finger 8 (the left end in FIG. 7) by screw fitting. The finger 29 is tubular with a closed end, and its end side is tapered into a tapered shape, and the end thereof is formed into a beautiful shape. Further, from the center to the tip side of the finger 29, the finger 29 is divided into a plurality of parts in the circumferential direction (for example, divided into four as shown in FIG. 8(b) K, or divided into lc6 as shown in FIG. 9(fi)) to form a leaf spring. An external claw 30 is formed at the tip VC.

The guide tube 28 has a connecting member 31 provided at the upper rear end thereof. This connecting member 31 consists of a connecting rod 33 that is parallel and integrally connected to the guide tube 28 via a connecting plate 32. A concave portion 34 consisting of an arcuate surface is formed on the upper surface of the distal end side of the connecting rod 33.
A 7 flange 35 is formed at the rear end of 3.

An inner rod 27 is inserted into the pull rod 26. The inner rod 27 is connected to an intermediate rod 36, a lock rod 37 screwed to the tip of the intermediate rod 36, a lock rod flag 38 screwed to the rear end of the intermediate rod 36, and a force 1. It has become. The lock rod flag 38 includes a rod-shaped portion 39 which is screwed onto the intermediate rod 36 and has a conical rear end and a rounded tip, and a rod-shaped portion 39 whose lower surface is integrally fixed to the upper surface of the rod-shaped portion 39 and has a through hole. 4
0 is a plate-shaped portion 41 formed parallel to the guide tube 28
It consists of The upper surface of the plate-shaped portion 41 has a recess 43 having a slope 42 and a protrusion 4 located behind the recess 43.
4 is formed.

The connecting rod 33 of the pull rod 26 is loosely fitted into the through hole 40, and its seven flange 35 can be engaged with and detached from the rear surface of the plate-like portion 41. The lock rod 37 has a smaller diameter than the intermediate rod 36 except for the head 45, and the head is 45t! finger 29
The diameter is slightly smaller than the inner diameter of the base. Therefore, when the head N545 is moved toward the distal end of the finger 29 with respect to the finger 29, each external claw 30 of the finger 29 is expanded.

Furthermore, a locking mechanism 46 is provided between the movable table 21 and the fuel rod retracting tools 25 so as to face each fuel rod retracting tool 25 . This lock mechanism 46 consists of a retainer (lock bin) 47, a ring plate 48, and a spring 49. The lock bin 47 has a plunger 50 at the bottom and is rounded at both ends.
It is fitted in so that it can be connected to and removed from the NC. The length of the lock bin 47 is such that when its upper end is pressed by the lower surface of a slide space 55 (described later), its lower end comes into contact with the bottom of the recess 34. The ring plate 48 is loosely fitted into the frame 47 and is attached to the movable base 21 with a lid placed above the 7-lunge 50. Spring 49 has 7 langes 50, ring plate 4
8, and urges the lock bin 47 toward the connecting member 31 side.

Note that the lower right portion 1c of the moving table 21 in FIG.
1 is formed, and a vertical surface 52 constituting this stepped portion 51 can be engaged with and detached from the connecting member 31 of the pull rod 26.

Further, the mounting plate 21bK of the moving table 21 is attached to the cylinder mechanism 53.
is provided parallel to the pull rod 26. A piston rod 54 of this cylinder mechanism 53 passes through the mounting plate 21b, and a frame-shaped slide pace 55 is attached to its tip. A space 56 is formed within this slide base 55. The slide pace 55 is slidably provided on the movable table 21. Cutouts 57 and 58 are formed in the upper and lower parts iC of the slide pace 55 on the side opposite to the cylinder mechanism 53, respectively. A piece-shaped lever 59 is disposed in the notch 57 above each fuel rod retracting tool 25 . The base end of the lever 59 is rotatably fitted onto a shaft 60Vc attached to the slide pace 55. The tip of the lever 59 can be engaged with and detached from the rear surface of the protrusion 44 (the right side surface in FIG. 1). Further, a spring 61 between spring seats VC#:t formed in each of the lever 59 and the slide pace 55Vc is provided so as to bias the lever 59 in the direction of arrow C in FIG. Notch 5
The vertical surface 58 & of the plate-shaped portion 41 can be engaged with and detached from the front surface (the left side surface in FIG. 1).

Further, a cylinder mechanism 62 and a horizontal shaft 63 are attached to a predetermined location of the fuel rod retractor 12, and a shaft 63tC
A hook-shaped lever 64 is rotatably attached.

The rear end of this lever 64 is rotatably attached to the piston rod of the cylinder mechanism 62, and the tip of the lever 64 is attached to the recess of the inner condom 2 lock keyaki 7 lug 38! 43, the protrusion 44Vc can be engaged and detached.

Further, the drive mechanism 13, cylinder mechanisms 53, 62, etc. are connected to a control device (such as a microcomputer), not shown, and are automatically controlled by this control device.

Next, the operation of the fuel assembly assembly apparatus configured as described above will be explained.

fi+ Selection of fuel rod retracting tool 25 For the fuel rod retracting tool 25 located in the VC in the fuel rod magazine 10 and facing the fuel rod 8 to be retracted into the skeleton assembly 9, the cylinder mechanism 62 is actuated (the control device is activated). For the fuel rod retracting tool 251C facing the fuel rod 8 that does not need to be retracted into the skeleton assembly 9, remove the lever 64 from the protrusion 44 (by inputting a command signal), and activate the cylinder mechanism 62 (inputting a command signal to the control device). (by inputting a command signal), the tip of the lever 64 is hooked onto the protrusion 44.

At this time, the engagement between the lever 59 and the protrusion 44 is released. Further, at this time, the lock pin 47Fi is fitted into the recess 43, and the glu rod 26 and the moving base 21 are engaged with each other.

(2) Skeleton assembly of pull rod 26 9
Insertion into '1' Next, the drive mechanism 13 is activated, thereby moving the movable table 21 in the direction of arrow B in FIG.

Then, the fuel rod retraction tool 25 facing the fuel rod 8 that does not need to be retracted into the skeleton assembly 9 is moved by lever 6.
Since it is engaged with #4, that #JIC remains.

From the recess 34 of this fuel rod retracting tool 25 to the lock bin 4
7 will automatically leave. The fuel rod retracting tool 25 facing the fuel rod 8 to be retracted into the skeleton assembly 9 is
Since a resistance force that does not allow relative movement between the movable stage 21 and the fuel rod retracting tool 25 acts between the recess 34 and the lock bin 47, the fuel rod magazine 1 passes through the skeleton assembly 9
The movable table 21 automatically temporarily stops at the position where the outer claw 30 comes into contact with the end plug 8& of the fuel rod 8 in the fuel rod 8.

(3) Connection of the end plug 8 & with the outer claw 30 Next, the cylinder mechanism 53 is operated to contract. Then, the lever 59 is pushed downward by the bridge 24, and the tip of the lever 59 is caught on the rear surface of the protrusion 44 of the lock bar flag 38, and further the lock bar flag 38 and the inner rod 27 are pushed downward.
, the lock rod 37 moves toward the outer claws 30 with respect to the fingers 29 via the intermediate rod 36, and the head 45 spreads each outer claw 30. From this K, each outer claw 30 is hooked on the inner 7 flange 8c of the recess 8b of the end plug 8 & of the fuel rod 8 shown in FIG. 10, and the fuel rod 8 and the fuel rod retracting tool 25 are connected.

(4) Retraction of fuel rods Next, in this state, the moving table 21 moves a predetermined amount in the direction of the arrow in FIG. is pulled by the pull rod 26 and drawn into a predetermined cell of the support grid 3 of the skeleton assembly 9. When the fuel ms has been drawn into the cell to a predetermined position, the movable table 21 temporarily stops. do. At this time, the lock bin 47Fi is still inserted into the recess 34.

(5) Disengagement of the outer claw 30 of the end plug of the fuel rod 8 Next,
The cylinder mechanism 53 operates to extend. Then, the lock bar flag 38 is pushed by the slide pace 55 and moves in the direction of arrow A in FIG.
In contrast to C, the head 45 moves in the direction indicated by the arrow p in FIG.

The outer claw 30 moves inward and narrows. Therefore, the end plug 8&
The outer claw 30 comes off and separates. Further, the engagement between the bridge 24 and the lever 59 is released, and the lever 59 is raised by the force of the spring 61. At this time, the lock bin 47 is
4 is fitted inside. Thereafter, the movable table 21 moves again in the direction of the arrow in FIG. 1 and returns to its original state, and thereafter the operations (1) to (5) are repeated.

Note that the above operations are automatically performed by the action of the control device.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of the main part showing one embodiment of the present invention, Fig. 2 is an enlarged detailed sectional view of the first round part of Fig. 1, Fig. 3 is a plan view of the main part, Figure 4 is a side view, Figure 5 is a plan view, Figure 6 is a schematic corner side view of the main parts, Figure 7 is a vertical side view of the fuel rod pulling tool, Figure 8 (- indicates the pull rod). 8(b) is a cross-sectional view of the tip of the
Fig. 9 is a cross-sectional view of the main part of a fuel rod retracting tool with a different number of divisions of the outer claw of the rod, Fig. 9
Figure (1,) is a view in the direction of the ■ arrow in Figure 9 (,), Figure 10 is a sectional view of the end plug portion of the fuel rod, and Figure 11 is a view of each outer claw of the fuel rod retracting tool of the present invention. Cross-sectional view showing a sunken state, 1st
Fig. 2 is a sectional view showing a state in which the outer claws of the fuel rod retracting tool of the present invention are expanded and connected to the end plugs of the fuel rods, Fig. 15 is a side view showing an example of a fuel assembly, and Fig. 14. 15 is a side view of a conventional fuel assembly assembly device, and FIG. 15 is a plan view of the conventional fuel assembly assembly device. 8... Fuel rod, 9... Skeleton assembly, 10... Fuel rod magazine, 12...
...Fuel rod retractor, 21...Movement platform, 25
...Fuel rod retraction tool 1, 26...Pull rod, 27...Inner rod, 34...
...Recess, 37...Lock rod, 43...
... recess, 46... lock mechanism, 47...
...Engaging body (lock bin), 53...Cylinder mechanism (drive mechanism), 55...Slide base, 59.64...Lever, 62...・Cylinder mechanism.

Claims (1)

[Claims] A plurality of fuel rods are attached to a movable stage that is movable in the axial direction of the fuel rods to a fuel rod retracting machine. In a fuel assembly assembly device that is pulled out using a rod pulling tool and placed at a predetermined location within a skeleton assembly, the tip end of the pull rod is comprised of a tubular pull rod and an inner rod that is slidably inserted within a predetermined range within the pull rod. The fuel rod retracting tool is provided with a fuel rod attachment/detachment mechanism, and an engaging body provided on the other is biased to be releasably engaged with a recess provided on one of the fuel rod retracting tool and the moving base. the movable base and the fuel rod retracting tool are automatically engaged within a predetermined resistance force against relative movement between the movable base and the fuel rod retracting tool; In some cases, the pull rod is moved by a lock mechanism that automatically releases these engagements, a stopper mechanism provided on the puller and capable of engaging and disengaging from a predetermined inner rod, and a drive mechanism provided on the movable table. a fuel rod attachment/detachment mechanism operating mechanism that is movable in the axial direction and that engages and disengages the inner rod to move the inner rod relative to the pull rod; a drive mechanism for moving the movable base; and a drive provided on the movable base. 1. A fuel assembly assembly device comprising a control mechanism for controlling a mechanism and a drive mechanism for a stopper mechanism.