JPH0129436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel handling device for a light water cooled nuclear reactor.

(Conventional technology) At nuclear power plants, regular inspections are carried out once a year. During this periodic inspection, all of the nuclear fuel installed in the reactor is removed by the fuel handling equipment and transferred to a separately installed fuel storage pool, where various inspections are performed. Further, the nuclear fuel that has been inspected is transferred into the reactor by a fuel handling device and loaded into the reactor again.

(Problems to be Solved by the Invention) Nuclear fuel handling work in which nuclear fuel is taken out of the reactor and transferred to the fuel storage pool as described above;
The work on the nuclear fuel handling equipment, which transfers the nuclear fuel that has been inspected from the fuel storage pool to the reactor and installs it inside the reactor, is carried out more than 10 meters below the water surface in order to shield radioactivity. The fuel handling equipment does not have a means to check the status of underwater work, so it is necessary to check the underwater work visually from above the water surface or by manually submerging a separately prepared underwater television camera into the water. The problem was that not only was work efficiency low when handling nuclear fuel, but it was also difficult to ensure work safety.

The present invention has been proposed in view of the above-mentioned problems, and its purpose is to handle nuclear fuel by removing nuclear fuel from a nuclear reactor and transferring it to a fuel storage pool, and to store nuclear fuel after inspection. It is possible to efficiently and safely handle the nuclear fuel that is transferred from the pool to the reactor and installed in the reactor. Another object of the present invention is to provide a fuel handling device for a light water-cooled nuclear reactor that allows accurate visual confirmation of nuclear fuel handling operations underwater.

(Means for Solving the Problems) In order to achieve the above object, the fuel handling device for a light water-cooled nuclear reactor of the present invention includes a traveling bogie that can run on rails, and a fixed mast having a long guide mast that is fixed on the transverse bogie and extends vertically downward from the transverse bogie; a telescoping telescopic member supported within the main mast and having a fuel gripping member at its lower end; and a telescoping telescopic member supported within the main mast and rotatably supported on the outer surface of the guide mast of the fixed mast via a guide roller. The system includes a rotating mast, and a telescope-type television camera holding member attached to the rotating mast in a hanging state.

(Function) The fuel handling system for a light water-cooled nuclear reactor according to the present invention is configured as described above, and has the following functions. That is, when loading fuel into a nuclear reactor, the traveling truck is run along the rails while the nuclear fuel is gripped by the fuel gripping member provided at the lower end of the telescopic telescoping member. The nuclear fuel is moved across the trolley to above the fuel mounting position of the reactor, and then the telescopic telescopic member and the fuel gripping member are lowered to unload the nuclear fuel. At this time, the telescopic television camera holding member is operated in the extension direction, the television camera is lowered to the vicinity of the nuclear fuel that has been lowered as described above, and then the rotating mast, the telescopic television camera holding member, and the television camera are removed. is rotated around the guide mast of the fixed mast, and a television camera is used to check the mutual status of the nuclear fuels to check the possibility of mutual interference.
Check whether it is possible to descend again. At that time, if necessary, the traveling truck and the traversing truck are slightly moved in the traveling direction and the traversing direction to enable nuclear fuel to be loaded.
After confirming that it can be mounted using a TV camera,
The fuel gripping member is opened, the nuclear fuel is loaded at a predetermined fuel loading position, the telescope type telescopic member and the fuel gripping member are then raised, and the telescope type television camera holding member is operated in the retracting direction. The TV camera was also raised.

In addition, when taking out nuclear fuel from a nuclear reactor, a traveling truck is run along the rails, a traversing truck is made to traverse the traveling truck, and the fuel gripping member provided at the lower end of the telescope type telescoping member is placed inside the reactor. It is moved to a position above the nuclear fuel to be taken out, and then the telescopic telescoping member is lowered to lower the fuel gripping member to a position just before it engages with the nuclear fuel. At this time, the telescope type television camera holding member is operated in the extension direction, and the television camera is lowered to the vicinity of the fuel gripping member that has been lowered as described above.
Next, the rotating mast, the telescopic television camera holding member, and the television camera are rotated around the guide mast of the fixed mast, and the fitting state of the fuel gripping member and the nuclear fuel is confirmed using the television camera. At that time, if necessary, the traveling truck and the traversing truck are slightly moved in the traveling direction and the traversing direction in the same way as in the previous case, so that the fuel gripping member correctly faces the nuclear fuel, and then the telescopic telescoping member and the fuel gripping member are moved. is lowered slightly to seat the fuel gripping member on the nuclear fuel, then the fuel gripping member is closed to grip and hold the nuclear fuel, then the telescopic telescoping member and the fuel gripping member are raised, and the telescopic television The camera holding member is operated in the retracting direction, and the television camera is also raised.

In addition, when confirming the nuclear fuel number, lower the TV camera as described above, rotate it, and check the number stamped on the nuclear fuel and inserts installed in the reactor.
is read by a television camera.

(Embodiment) Next, the fuel handling system for a light water-cooled nuclear reactor of the present invention will be explained using an embodiment shown in FIGS. 1 to 5. b is a large number of nuclear fuels installed in a rectangular coordinate system in core zone _a1 in the reactor a, c is a cavity formed above the reactor a, and the cavity c is filled with water. Note that the cavity c is filled with water only during periodic inspections during nuclear fuel handling work, etc., and is not filled with water during normal operation. In addition, 1 is a running rail laid on the floor on both sides of the cavity c, 2 is a running trolley that runs on the same running rail 1 straddling the cavity c, and 3 in Figs. 1 and 3.
is a transverse bogie that traverses on the transverse bogie 2 in a direction perpendicular to the traveling direction thereof, and 4 is a fixed mast fixed on the transverse bogie 3, and the fixed mast 4 extends vertically downward from the transverse bogie 3. It has an elongated guide mast 4'. 5 is a main mast, the upper part of the main mast 5 is fitted into the guide mast 4' of the fixed mast 4, and a guide roller attached to the upper end flange of the main mast 5 guides the fixed mast 4. The main mast 5 is rotatably supported within the guide mast 4' of the fixed mast 4, in contact with the upper end collar of the mast 4'. In addition, 7 in FIG. 1 is a telescope type telescopic member inserted into the main mast 5,
Reference numeral 6 in FIGS. 1 and 3 denotes a guide roller that only allows the telescopic member 7 to move up and down, and the guide roller 6 is attached to the main mast 5. Further, reference numeral 8 denotes a fuel gripping member attached to the lower end of the telescope-type telescopic member 7, 9 a wire rope that suspends and supports the telescope-type expandable member 7, and 1
0 is a wire rope winding machine installed on the above-mentioned transverse truck 3, 11 in FIG. 3 is a swinging mast surrounding the guide mast 4' of the above-mentioned fixed mast 4, and 12 is attached to the upper end of the swinging mast 11. multiple wheels,
Reference numeral 13 denotes a plurality of rollers attached to the upper and lower parts of the rotating mast 11, and each wheel 12 contacts the upper surface of the traversing truck 3, and each roller 13 contacts the outer surface of the guide mast 4' of the fixed mast 4. In contact, a pivoting mast 11 is pivotably supported. In addition, 14 in FIGS. 1 to 5 is the outer mast of the telescope type TV camera holding member, 15 is the intermediate mast of the same telescope type TV camera holding member, and 16 is the inner mast of the same telescope type TV camera holding member. ,
The outer mast 14 is fixed to the swinging mast 11 in a hanging state, the intermediate mast 15 is fitted into the outer mast 14, and the inner mast 16 is fitted into the intermediate mast 15. Reference numeral 17 denotes a guide roller attached to the outer mast 14, and the guide roller 17 contacts a rail-shaped protrusion provided on the outer surface of the intermediate mast 15, so that the intermediate mast 15 only moves up and down inside the outer mast 14. Possibly supported. Reference numeral 18 denotes a guide roller attached to the intermediate mast 15, and the guide roller 18 contacts a rail-shaped protrusion provided on the outer surface of the inner mast 16, so that the inner mast 16 only moves up and down inside the intermediate mast 15. Possibly supported.
19 in FIGS. 1 and 2 is a television camera attached to the lower end of the inner mast 16, 20 in FIGS. 3 and 5 is a pair of sheaves attached to the lower end of the intermediate mast 15, and 21 is the same sheave 20. One end of each wire rope 21 is fixed to the upper end of the outer mast 14, and the other end of each wire rope 21 is fixed to the inner mast 1.
It is fixed to the upper end of 6. Further, 22 is a wire rope hoisting machine installed at the upper end of the swing mast 11, and 23 is a wire rope that is hoisted or paid out by the wire rope hoisting machine 22, and the lower end of the wire rope 23 is inside the above-mentioned It is fixed to the upper end of the mast 16, and drives a wire rope hoist 22 to wind up and let out the wire rope 23, thereby extending and contracting each mast 14, 15, and 16 of the telescopic television camera holding member. i.e., raising and lowering the inner mast 16 and simultaneously moving the intermediate mast 15 along the sheave 20.
The wire rope 21 is moved up and down by following the stroke of 1/2 of the inner mast 16 due to the principle of a movable pulley. Further, 24 is a swing drive device installed at the upper end of the swing mast 11, and 25
is an annular gear fixed to the outer peripheral surface of the guide mast 4' of the fixed mast 4 (the annular gear 25 may be replaced with a chain, sprocket, etc.)
The gear attached to the output shaft of the swing drive device 24 is meshed with the annular gear 25, and the gear attached to the output shaft of the swing drive device 24
4 and rotates the gear attached to its output shaft, the swing drive device 24, the swing mast 11, and each mast 14 of the telescopic television camera holding member.
15, 16 and the TV camera 19 are fixed to the mast 4.
The guide mast 4' is adapted to be pivoted around the guide mast 4'.

Next, the operation of the fuel handling system for the light water cooled nuclear reactor shown in FIGS. 1 to 5 will be explained in detail.

() When loading fuel into a nuclear reactor.

As shown in FIG. 1, while the fuel gripping member 8 provided at the lower end of the telescopic telescopic member 7 grips the nuclear fuel b, the traveling bogie 2 is moved to the rail 1.
The nuclear fuel b is moved above the fuel mounting position of the reactor a by moving the transverse cart 3 over the moving cart 2, and then the wire rope hoist 10 is moved in the wire rope payout direction. It is driven, the wire rope 9 is let out, the telescope type telescopic member 7 and the fuel gripping member 8 are lowered, and the nuclear fuel b is discharged. At this time, the wire rope hoisting machine 22 is driven in the wire rope payout direction to pay out the wire rope 23, and each mast 14 of the telescope type television camera holding member,
15 and 16 are operated in the extending direction, and the television camera 19 is lowered to the vicinity of the nuclear fuel b that has been lowered as described above. That is, the inner mast 16 of the telescopic television camera holding member is lowered, and at the same time, the intermediate mast 15 is lowered so as to follow the stroke of the inner mast 16 by 1/2 by the movable pulley principle of the sheave 20 and wire rope 21. Then, the television camera 19 is lowered near the nuclear fuel b that has descended as described above. When the lower end of the nuclear fuel b approaches the upper end of the core zone a ₁ (meaning the upper end of the adjacent nuclear fuel), the wire rope hoist 10,
22 is stopped, and then the swing drive device 24 is driven to rotate the gear meshing with the annular gear 25 of the guide mast 4' of the fixed post 4. Each mast 14, 15 of the camera holding member,
16 and a television camera 19 are rotated around the guide mast 4' of the fixed mast 4, and the television camera 19 is used to check the mutual condition of the nuclear fuels to check the possibility of mutual interference and to check whether it is possible to descend again. or At that time, if necessary, the traveling trolley 2
Then, the traversing truck 3 is slightly moved in the traveling direction and the traversing direction to enable the loading of the nuclear fuel b, and when the TV camera 19 confirms that the loading is possible, the fuel gripping member 8 is released and the nuclear fuel b is placed in a predetermined position. The fuel is mounted at the fuel loading position, and then the wire rope hoist 10 is driven in the wire rope hoisting direction to wind up the wire rope 9 and raise the telescopic telescoping member 7 and the fuel gripping member 8. At this time, the wire rope hoist 22 is driven in the wire rope hoisting direction to hoist the wire rope 23, and each mast 14, 15, 16 of the telescopic television camera holding member is actuated in the retracting direction. The camera 19 is also raised.

() When nuclear fuel is removed from a nuclear reactor.

The traveling truck 2 is made to travel along the rail 1, the traversing truck 3 is made to run sideways on the traveling truck 2, and the fuel gripping member 8 provided at the lower end of the telescopic telescoping member 7 is used to collect the nuclear fuel to be taken out from the reactor a. b, then drive the wire rope hoist 10 in the wire rope payout direction,
The wire rope 9 is let out, the telescopic telescopic member 7 is lowered, and the fuel gripping member 8 is lowered to a position just before fitting into the nuclear fuel b. At this time, the wire rope hoist 22 is driven in the wire rope payout direction to pay out the wire rope 23, and each mast 14, 15, 16 of the telescopic television camera holding member is actuated in the extension direction. The camera 19 is lowered to the vicinity of the fuel gripping member 8 that has been lowered as described above, and then the swing drive device 24 is driven to rotate the gear meshing with the annular gear 25 of the guide post 4' of the fixed post 4. , the swing drive device 24 and the swing mast 1
1, each of the masts 14, 15, 16 of the telescopic television camera holding member, and the television camera 19 are rotated around the guide mast 4' of the fixed mast 4, and the television camera 19 detects the fuel gripping member 8 and the nuclear fuel b. Check the mating status. At that time, if necessary, the traveling truck 2 and the traversing truck 3 are slightly moved in the traveling direction and the traversing direction in the same manner as in the case of () above, so that the fuel gripping member 8 correctly faces the nuclear fuel b, and then the telescopic type telescopic type The member 7 and the fuel gripping member 8 are lowered slightly to seat the fuel gripping member 8 on the nuclear fuel b, and then the fuel gripping member 8 is closed to grip and hold the nuclear fuel b,
Next, the wire rope hoisting machine 10 is driven in the wire rope hoisting direction, the wire rope 9 is hoisted up, and the telescopic telescoping member 7 and the fuel gripping member 8 are raised. At this time, the wire rope hoist 22 is driven in the wire rope hoisting direction,
The wire rope 23 is wound up, and each mast 14, 15, of the telescopic television camera holding member is
16 in the retracting direction, the TV camera 1
It also raises 9.

() Confirmation of nuclear fuel number.

Lower the television camera 19 in the manner described above,
The television camera 19 reads the nuclear fuel b installed in the nuclear reactor a and the stamp NO on the insert.

In this embodiment, the telescope type television camera holding member is attached to the outer mast 14 and the intermediate mast 15.
This is a three-stage telescope-type television camera holding member consisting of an inner mast 16 and an inner mast 16, but depending on the length of the outer mast 14 and the lifting stroke,
A tiered or four-tiered telescopic television camera holding member may be used. In addition, the expansion and contraction mechanism of the telescope type television camera holding member uses a movable pulley (sheave 20 and wire rope 21) in order to stabilize the lifting load and improve the accuracy of the television camera position. 20 and the wire rope 21 may be omitted and a normal expansion/contraction mechanism may be used.

(Effects of the Invention) The fuel handling device for a light water-cooled nuclear reactor of the present invention is configured as described above, and can achieve the following effects. In other words, conventional fuel handling equipment is not equipped with confirmation means such as a television camera to confirm the underwater work status, and it is difficult to confirm the position of the nuclear fuel and the fuel gripping member or core bottom pin, or the position of the nuclear fuels (mainly due to interference). In actual work, there may be problems such as poor positioning between the nuclear fuel and the fuel gripping member. There were times when the work was difficult. As an example, if the standard cycle of 15 minutes/one body occurs, the cycle time will be 30 minutes.
In some cases, the cycle was ~60 minutes/one body, but the fuel handling system for the light water-cooled nuclear reactor of the present invention has a running bogie that runs on rails, and a running direction that is perpendicular to the running direction of the bogie. a fixed mast having a long guide mast that is fixed on the transverse bogie and extends vertically downward from the transverse bogie; and a fixed mast that is rotatably supported within the guide mast of the fixed mast. a main mast, a telescoping telescopic member supported within the main mast and having a fuel gripping member at its lower end, and a rotating mast rotatably supported on the outer surface of the guide mast of the fixed mast via a guide roller. The system is equipped with a telescope-type TV camera holding member that is attached to the rotating mast in a hanging state, allowing the TV camera to visually check a wide underwater work area including the bottom of the reactor core, and quickly providing positional information on nuclear fuel and fuel gripping members. , Nuclear fuel handling work involves removing nuclear fuel from the reactor and transferring it to the fuel storage pool after being properly obtained, and transferring nuclear fuel that has been inspected from the fuel storage pool to the reactor. This allows for efficient and safe handling of nuclear fuel.

In addition, underwater, light beams are easily refracted, and if the rotating mast is tilted and the viewing angle of the television camera changes even slightly, it is difficult to accurately see the nuclear fuel handling operation underwater. In the device, the swing mast is rotatably supported on the outer surface of a fixed mast guide mast (a long guide mast extending vertically downward) via a guide roller,
Since the rotating mast does not tilt, nuclear fuel handling operations underwater can be accurately visualized, and from this point of view as well, nuclear fuel handling operations can be carried out efficiently and safely.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the fuel handling system for a light water-cooled nuclear reactor according to the present invention, FIG. 2 is a vertical side view showing an enlarged view of the lower part of the main mast, and FIG. 4 is a cross-sectional side view showing an enlarged view of the main parts of the handling device; FIG. 4 is a cross-sectional plan view taken along the arrow line - line in FIG. 3; and FIG. 5 is a cross-sectional view taken along the arrow line V-V in FIG. It is a diagram. a...Nuclear reactor, b...Nuclear fuel, 1...Rail,
2... Traveling bogie, 3... Traversing bogie, 4... Fixed mast, 4'... Guide mast, 5... Main mast, 7
...Telescope type telescoping member, 11...Swivel mast, 13...Guide roller, 14, 15, 16...
Telescope type television camera holding member, 19...
TV camera.

Claims (1)

[Claims] 1. A traveling bogie that runs on rails, a traversing bogie that traverses the traversing bogie in a direction perpendicular to the traveling direction, and a long traversing bogie that is fixed on the traversing bogie and extends vertically downward from the traversing bogie. a fixed mast having a guide mast; a main mast rotatably supported within the guide mast of the fixed mast; a telescoping telescoping member supported within the main mast and having a fuel gripping member at its lower end; A rotating mast rotatably supported on the outer surface of a guide mast of a fixed mast via a guide roller, and a telescope type television camera holding member attached to the rotating mast in a hanging state. Fuel handling equipment for light water cooled nuclear reactors.