JPS593295A - Nuclear fuel handling device - 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 The present invention relates to an apparatus for handling nuclear fuel (assembly) of a nuclear reactor in a pressurized water nuclear power plant or the like.

Pressurized water nuclear power generation plan) The life of nuclear fuel used in IC is usually 5 years, and the reactor is opened once a year to replace the fuel in the core valves and reuse the remaining fuel in the core valves. Periodic inspections will be carried out. Therefore, all fuel is removed from the reactor and inserted into fuel racks arranged in a fuel storage pool (also called a spent fuel pool), and various fuel inserts are replaced and inspected within the pool. Later,
A portion is loaded back into the reactor.

The nuclear fuel handling device of the present invention is attached to a fuel storage pool in order to carry out the work of transferring fuel and replacing the interpolated material in the pool.

An outline of the fuel storage pool and nuclear fuel handling equipment described above is shown in FIGS. 1 and 2, in which fal is a group of racks arranged in the pool, (b) is a gate between each sheave chamber, (
C) is nuclear fuel, and in the conventional plant,
Running rails (1) laid on both sides of the fuel storage pool (
A self-propelled crane (8) is installed at 11, and the crane (θ
) Attach an electric hoist (fl) that can be manually moved horizontally in the travel direction and the direction perpendicular to the upper end of the -yz It is designed to be able to move in the three-dimensional direction, and to be able to transfer the fuel (fc) and replace its interpolated material.

However, in the nuclear fuel handling equipment described above,
- All movements in the Y-Z directions are performed manually, and it is necessary to replace the special handling tool fgl each time depending on the object to be handled (about 4 types including nuclear fuel and its interpolated materials), and in recent years, There is a strong demand for shortening the required period and reducing radiation exposure for workers in the periodic inspection work of nuclear power plants, and it has become essential to automate nuclear fuel handling equipment and consolidate dedicated handling tools. The system uses a wire to lift the fuel, which causes shaking when running, and has a structure that is difficult to automate due to problems with positioning accuracy when stopped.

The present invention was developed in view of the above-mentioned actual situation regarding conventional nuclear fuel handling equipment, and includes a telescopic mast vertically mounted on a transverse bogie mounted on a longitudinal bogie, and A fuel gripping portion is provided at the peripheral edge of the tip of a guide tube mounted in the inner mast so as to be movable up and down, and a handling member for the insert is disposed in the guide tube so as to be movable up and down. The purpose of this is to provide a nuclear fuel assembly in which a gripping part for a fuel assembly and a handling member for its insert are installed together, and they can be operated stably with minimal shaking and can be intransitively operated. The point is that it provides handling equipment.

The present invention has the above-mentioned configuration, in which a telescopic mast is vertically installed on a transverse carriage equipped with a longitudinal carriage, and a guide tube is installed in the inner mast of the telescopic mast so as to be movable up and down. A fuel gripping portion is provided at the peripheral edge of the tip, and an insert handling member is provided in the guide tube so as to be movable up and down, so that the telescopic mast and the guide attached thereto can be easily moved from the transverse truck. Both the fuel gripping part supported through the tube and the insert handling member disposed and supported in the guide tube operate stably with almost no shaking, and the fuel and insert are handled in a stable manner. Grasping and handling can be carried out accurately and easily, and both operations can be done equally quickly, and various mechanisms can be automated on the side legs and can be operated by remote control mechanisms. Further, since the gripping portion and the handling member can be moved up and down by the telescopic mast and the guide tube and there is no shaking, there is an advantage that the device can be easily and quickly moved vertically and horizontally.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, illustrations of embodiments of the present invention will be described.

Fig. 1 and Fig. 2 show an outline of an example of the use of the present invention in an actual case, Fig. 5 and Fig. 4 show the mechanism of an embodiment of the present invention, and Fig. 5 shows the usage mode of an actual example. In Figures 1 and 2, a group of rectangular fuel racks are arranged in orthogonal coordinates in the fuel storage pool, each containing one fuel (c) (nuclear fuel assembly). It is now possible to store.

As shown in the figure, the pool is divided by a gate (b) into a pool room (a) in which a group of fuel racks (a) are arranged, a canal part (b), and an inspection pit part (c),
During normal plant operation, only the pool room (A) is filled with water and the other parts (B) and (C) are kept dry, but during the above inspection, all gates (B) were removed and connected. Fill the entire Seshime pool with water.

Vertical running rails (1) (1) for nuclear fuel handling equipment are laid on both floors of the pool.

Fig. 5 (during normal work on Al, Fig. 3 CB) shows the structure of the nuclear fuel handling device according to the present invention when the mast is raised, and the longitudinal carriage (2) is connected to the running rail (1) (1). At the top, an electric motor (not shown) allows vertical movement over the pool, and a transverse trolley (3) installed on the vertical trolley (2) moves vertically over the pool (
2) It has a structure that allows it to traverse in a direction perpendicular to the traveling direction (both are driven by electric motors). Also, the traversing trolley (3)
is equipped with a fixed mast (4), and a telescopic mast formed by combining an outer mast (5) and an inner mast (6), which will be described later, is mounted vertically on the fixed mast (4).

FIG. 4 shows the structure of an actual case of the present invention, where the outer mast (5) and inner mast (6) have a cylindrical telescope shape as shown, and the inner mast (6) is similar to the outer mast. (5
), it is only free to expand and contract in the vertical direction, and
The outer mast (5) is a fixed mast (4) on the transverse truck (3)
It is mounted freely only for rotation in the horizontal plane.

Its rotation is for fine adjustment and is normally locked mechanically with a stop lever (not shown), and the lowering of the inner mast (6) due to its own weight is regulated by force. Furthermore, a plurality of guide rollers (8) are fixed to the inner mast (6), and these guide rollers (9) are connected to the inner mast (6).
) is supported so that it can be retracted vertically with respect to the inner mast (6) in a rotationally restrained state.

At the lower end of the guide tube (9), a fuel gripping portion and a fuel insert guide member having a structure described later are attached.

The fuel gripping portion includes a plurality of positioning guide pins (10) with respect to the fuel (cl), a plurality of gripping claws αB, and the same claws (111).
The gripping claw (11) is housed in the frame (131); When fluid pressure is applied to the port (b) side of port (a), the gripping claw (111) comes out from the bottom of the frame (131) under the action of a cam and collects fuel as shown in FIG. I can understand (c).

The frame body Q3) is provided with a comb-shaped insert guide plate f141 and an actuating cylinder (electronic insert guide part) of the guide plate f141. The insert guide plate (14) can be rotated inward by about 90° (see Figure 5 (described later), which shows a state in which Q rotates and guides the insert). , the guide tube (9) has a cylindrical gripping tube (for gripping the insert [al) attached to the fuel (c).
1G is built in so as to be movable up and down, and a guide rail 071 and a guide roller (1) are installed so that the guide tube (9) and the guide tube (9) can be retracted in the up and down direction while being rotationally restrained.

The guide rail On is fixed to the inside of the guide tube (9) and to the outside of the guide roller grip tube (161).

However, the guide tube (9) is
The gripping tubes 061 each have a structure that allows them to expand and contract in the downward direction while being restrained in their rotational direction.

Furthermore, a rod 09 with a tapered lower end is built into the gripping tube (161), and a cylinder (20) installed at the upper part is used to hold the rod (06) against the gripping tube (161).
You can stroke HJ up and down.

Next, for the suspension means of the guide tube (9) and the grip tube (1θ), the grip tube 0 port is connected to the hoisting machine (21
) (It can be rolled up and lowered according to Figure 3 (see Al).

On the other hand, the guide tube (9) is suspended by the wire rope (2 rods) via two tiers of stones/stools (4) or (2) suspended in several cases by the gripping tube (0θ), and the guide tube (9) Due to the action of the stopper cylinder (26) attached to the stopper, it can be suspended in two stages: the stopper (2nd position (state shown in Figure 4)) and the stopper (2G position (state shown in Figure 5 (state Q)).

The illustrated example of real power has the structure described above,
Next, to explain the operation, the nuclear fuel handling device of this embodiment can change the arrangement of the fuel fcl between the fuel racks fa1 group in the fuel storage pool shown in FIGS. 1 and 2, and This is to replace various inserts (dl, i.e. clusters for side legs, single plugs (to block unused control rod guide tubes), etc., which are inserted in the
N~(Explained using Q.

(11. Regarding the transfer of fuel, the initial state of the telescope mast when taking out fuel (Cl) and transferring it to another rack is the state shown in Figure 4, and the vertical carriage ( 2) and a traversing trolley (
3), and then lower the guide tube (9) by lowering it with the hoisting machine (21), the guide pin 0
[ is inserted into a hole (not shown) provided in the fuel top, and the fuel (C) and guide tube (9) are positioned. With the guide tube (9) seated on the fuel, the hoisting machine 01) is stopped and brought into the state shown in FIG. 5 (Al).

Next, fluid pressure is applied to the port (b) side of the claw actuating cylinder O2 to grasp the fuel fc) with the gripping claw (11), and then the hoisting machine (211) is moved as shown in Fig. 5fB. Roll up the fuel slightly above the top of the fuel rack (a).

After positioning it on another fuel rack into which fuel is inserted by moving by the vertical truck (2) and the transverse truck (3), lower it until the fuel is seated on the bottom of the rack in the same way as above, and then lower the cylinder for claw operation (lz). Fluid pressure flows in from the port (a) side, and the gripping claw is separated from the fuel (cl) and moved slightly upward.

fi), on permutations of interpolants.

Kneading is a pattern in which only the insert (d) inserted into the fuel (c) is extracted and inserted into another fuel, and the guide tube (9) is lowered and seated in the fuel ( The steps up to FIG.
The chisel is lowered and its lower end fits into the hole in the top of the insert (d). In this state, the hoisting machine (21) is stopped, and the rod (11 is pushed down by the cylinder (2) to grasp the insert fd at the lower end of the gripping tube Q61.

Next, the cylinder for the stator horn (20) is removed by the stator horn, the hoisting machine (21) is hoisted and the insert [al] is started to be extracted from the fuel (c), and the guide plate actuating cylinder (151
The insert guide plate Q41 is rotated inward by about 90 degrees by the operation of , and guides the rond part of the insert. Note that the insert is raised while being guided by the guide plate (14). Before the stone, Rfl■ passes through the cylinder (26) installed at the upper end of the guide tube (9), when the cylinder lowers the stopper (25), the grip tube (lf3) and the stopper ( 25), the guide tube (9) begins to rise.

After pulling up the guide tube (9) slightly above the top of the fuel rack (a) as shown in Figure 5 (Q),
Move horizontally onto another fuel.

Thereafter, the pattern of inserting the interpolant fat into another fuel can be generally performed by reversing the procedure of the above-mentioned extraction (details are omitted).

(iii) Regarding the lifting of the telescopic mast, the fuel storage pool should be filled with water to shield radioactivity when fuel is stored, and the canal section (b) in Figure 1 should be filled during plant operation. , check bit part (
In c), the water is drained, so the gate fbl is closed.

However, since the mast has a telescope shape as in this embodiment, when the gate is closed, it is easy to raise and retract the inner mast (6) and pass through the gate (b1 part). Outer mast (5) as shown in figure (Bl)
The inner mast (6) can be housed therein, and the guide tube (9) can be housed inside the inner mast (6).
Vertical and transverse movement by the vertical carriage (2) and the transverse carriage (3) can be extremely easily and quickly made, and maintainability can be improved.

The mast is pulled up using the hoisting machine (211) via the guide tube (9) to the point shown in FIG. 5fB.

In addition, the positioning of both carts and the order of operation of each mechanism, etc.
This can be controlled by an appropriate control device having a memory circuit (not shown), and a far-corner automatic operation JS structure can be realized.

In nuclear power plants, there is an urgent need to reduce the radiation exposure of workers, and the effects of accelerating the operation of nuclear fuel handling equipment accurately and automating it remotely will be extremely effective.

However, conventional clothing! d is a manual operation system that requires long hours of work by many workers, and requires the replacement of several types of special tools based on handling experience. ! In addition, since Tomo and Yonihachi are freely suspended by the wire roso, they have equal points such as automation = m, but according to the above example, % rampant The telescope-shaped mast is connected to the trolley, the fuel holding part supported via the first guide tube attached to it, and the handling members for internal objects disposed in the guide tube that are not supported. There is almost no shaking, and movements such as vertical movement are stable and accurate, and the gripping of fuel and inserts, as well as weir handling, can be done accurately, easily, and quickly, and the betting mechanism is automatically controlled. This makes it possible to increase work efficiency, reduce the number of workers, and therefore reduce the amount of radiation exposure.

In the above embodiment, the inner and outer masts are used to enable vertical and horizontal lowering, but it is also possible to replace the outer mast with the mechanism itself on the equipment side, and the mast raising can be performed by hoisting the fuel handling mechanism. Although the inner mast is shared with the machine, it is also possible to operate only the inner mast with a separate winding machine, and doing so is advantageous in terms of load monitoring, etc.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. It is.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional general fuel storage pool, Fig. 2 is a schematic diagram showing the relationship between the vertical cross section of the pool in Fig. 1 and the nuclear fuel handling equipment attached to it, and Fig. 5 (N is the present invention). Figure 3 (B) is an overall vertical cross-sectional view showing an overview of an example of real power, and Figure 6 (
Fig. 4 is an enlarged cross-sectional view of
Fig. 5 (~(Bl) (01 is an explanatory diagram of each usage mode in Fig. 4. 1: Traveling rail 2: Vertical bogie 5: Transverse bogie 4: Fixed mast 5: Outer mast
6: Inner mast 9: Guide chews 10, 11, 12, 15: Fuel gripping part 14: Insertion guide plate 16.19: 2 people outside the members handling inserts (151 1st Kannan 20 1st Continuation of page (7 ■ Inventor: Shigeo Iida, No. 1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. ■ Inventor: Kaoru Kida, No. 1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Shimome No. 1 Mitsubishi Heavy Industries, Ltd., Kobe Shipyard & Machinery Works ■Applicant: Kansai Electric Power Co., Inc., 3-3-22 Nakanoshima, Kita-ku, Osaka (7th applicant: Shikoku Electric Power Co., Ltd., 2-5 Marunouchi, Takamatsu City +71) Applicant: Kyushu Electric Power Co., Ltd., 2-1-82 Watanabe-dori, Chuo-ku, Fukuoka City (γ11 Applicant: Japan Atomic Power Co., Ltd., Otemachi-6-chome, Chiyoda-ku, Tokyo, Japan (Applicant: Mitsubishi Heavy Industries, Ltd., 2-chome, Marunouchi, Chiyoda-ku, Tokyo) 5 number 1

Claims (1)

[Claims] A telescope mast is vertically installed on a transverse carriage mounted on a longitudinal carriage, and a fuel gripping portion is provided at the peripheral edge of a guide tube that is vertically movably mounted in the inner mast of the telescope mast. Also, a nuclear fuel handling device characterized in that an insert handling member is arranged in the guide tube so as to be movable up and down.