JPH0217358Y2 - - Google Patents

Description

[Detailed description of the invention] This invention transfers spent nuclear fuel used in a nuclear reactor to a spent nuclear fuel pool, and in order to perform various inspections, repairs, etc. in the pool, desired parts of this nuclear fuel are removed. , relates to a spent nuclear fuel handling jig used for operation from a workbench near the side of the pool.

As is known, during periodic inspections of nuclear reactors, the nuclear fuel A is transferred onto a designated pedestal C in the spent fuel pool B, which has a water depth of more than 10 meters, as shown in Figure 1. Worker E performs work such as removing and installing the necessary parts of the nuclear fuel A.

Since the above work involves underwater operation, a jig for handling is naturally required, but in the past, this type of work required operator E to hold a hollow pole with one hand hanging down, as shown in the same figure. By holding F and raising and lowering the handle G with the other hand, the wire H inside the pole F is raised and lowered, thereby raising and lowering this hollow pole F.
The grip part provided at the lower end can be opened and closed freely, and by the closing movement of the grip part, the desired member of the nuclear fuel A can be gripped by the grip part, thereby making it possible to rotate or pull out the member. be.

Therefore, for nuclear fuel A, there are times when it is necessary to operate the parts in the shallow water part _A1 , and there are times when it is necessary to handle the parts in the deep water part _A2 .
For this reason, until now, as shown in the figure, in order to be able to operate members over the entire length of nuclear fuel A, which has a total length of 4 m, we have prepared a number of jigs of various lengths and short lengths, and have used these jigs selectively.

For this reason, not only are many different types of jigs required, which is uneconomical, but also the operation of the handle G is transmitted to the gripping part via the wire H, so if the wire H is a stranded wire, This has a defect in that, since it has elasticity, it accompanies expansion and contraction, and as a result, the movement of the gripping part by the handle G becomes slow, reducing the accuracy of the movement of the gripping part.

Therefore, in order to improve this, in order to construct the above-mentioned underwater handling jig, there is already a method in which divided unit members are prepared in advance and the required number of unit members are connected as necessary. This type of device not only divides the hollow pole F, but also divides the transmission rod that serves as the wire H, and connects both of them. However, with this type of conventional method, not only is it not possible to perform the connecting operation simply and quickly, but it is also difficult to achieve high precision in the overall length dimensions of the hollow pole F and the transmission rod obtained as a result of the connection. Therefore, when the handle G is used to open and close the gripping portion, the power transmission function is not performed smoothly, and there is a problem that a failure is likely to occur during use.

In view of the above-mentioned difficulties with the prior art, the present invention has been developed to ensure that no matter how many hollow poles and transmission rods are connected, the relative lengths of the hollow poles and transmission rods can be maintained with high precision with respect to the specified dimensions. By properly configuring the transmission rod connection mechanism, quick connection operations can be performed with only a simple operation on the transmission rod, and this connection mechanism The purpose of this is to prevent errors in the length of the transmission rod from the specified value due to this.

The present invention will be described in detail with reference to the embodiment shown in FIGS. 4 and 5. Unit members 1, 1'...
The underwater handling jig according to the present invention is constructed by connecting two or more unit members, and each unit member has a length of, for example, 2 m.
These are all equipped with an exterior hollow pole 2, 2'... and a hollow or solid transmission rod 3, 3'... inserted into the pole 2, 2'. .

The proposed jig includes a desired plurality of exterior hollow poles 2, 2'... in the unit members 1, 1'...
are coaxially connected in the longitudinal direction, and each of the above-mentioned transmission rods 3, 3'... has a connecting part 4, 4'... formed at its end and a connected part 5, 5'. . . . so that they can be detachably connected as shown in FIG. 4.

Here, in the case illustrated in FIGS. 4 and 5 above, the connecting part 4 provided at the lower end of the unit member 1 connects to the collar plate 6 fixedly attached to the transmission rod 3 and the transmission rod 3. A spring S is fitted onto the transmission rod 3 and interposed between the presser 7 and the presser 7, which is fitted so as to be able to move up and down freely. (see), on both the left and right sides of the rod 3,
The locking connecting arms 9, 9' are connected to the shaft pin 1 at their upper ends.
0 and 10', and the lower ends of the arms 9 and 9' have locking free ends 11 and 11' bent inward.
are placed in opposing positions.

In addition, the exterior hollow pole 2 of the unit member 1 includes:
A large diameter portion 2 ₁ is formed at its lower end, and a cap nut 12 fitted onto the pole ₂ is engaged with the engagement shoulder edge 2 2 obtained thereby.

On the other hand, for the unit member 1' adjacent to the unit member 1, at the upper end of the exterior hollow pole 2',
The large-diameter portion 2 ₁ forms a large-diameter receiving portion 2 ₁ ′ into which the large-diameter portion 2 ₁ can be fitted, and within the receiving portion 2 ₁ , there is a receiving shoulder edge 2 ₂ against which the lower end of the large-diameter portion 2 1 abuts. ' is formed, and a threaded portion 13 into which the cap nut 12 is screwed is carved on the outer periphery.

In the above embodiment, in order to connect the connecting parts 4, 4', . . . and the connected parts 5, 5', . As a result, the distal end of the tool 7 presses the proximal end portions of the locking connecting arms 9, 9' which are curved outward, and the arms 9, 9' are then pressed against the shaft pins. 1
It is opened to both the left and right sides centering on 0 and 10'.

Next, while maintaining the open state, the unit members 1 and 1' are brought close together so that the tip of the transmission rod 3 in the connecting part 4 collides with the transmission rod 3' of the connected part 5, and in this state, When the hand is released from the presser tool 7 which has been raised, the tool 7 is moved downward by the restoring force of the spring S, thereby closing the locking connecting arms 9, 9'.

As a result of the above closing, the locking free ends 11, 11' of the arms 9, 9' are locked in the locking groove 14 of the connected portion 5 provided around the upper end of the transmission rod 3'. The state is maintained by the elasticity of the spring S, as shown in FIG.

Next, from the state of B, the exterior hollow poles 2, 2'
By butting together the large diameter part 2 ₁ , the large diameter receiving part 2
₁ ', and by screwing the cap nut 12 onto the threaded portion 13, the exterior hollow poles 2, 2' are connected.

Furthermore, in this invention, for the lowest unit member,
At the lower ends of the transmission rod and the exterior hollow pole, as shown in FIG. 4, an actuator 15 and a gripping mechanism 16 for gripping a desired member A' of the nuclear fuel rod A are provided, respectively.

The mechanism 16 shown here has left and right slits 17, 1 opened at the lowest end of the exterior hollow pole.
7' is cut, and the gripping arms 19, 19', which are housed in the slits 17, 17' and are pivotally supported by pins 18, 18', are inserted in the direction in which they can freely protrude and retract from the slits 17, 17'. , are suspended so as to be able to open and close freely, and the upper ends of the gripping arms 19 and 19' are bent inward and are loosely fitted into the engagement groove 20 recessed in the actuator 15, so that the transmission If the rod 3'' is moved upward, the gripping arms 19, 19' will hold the pin 1.
8 and 18', and is configured to be able to grip member A' with its lower end.

Next, the uppermost unit member 1 is provided with a handle 21 for raising and lowering the transmission rod 3, and the lifting operation of the handle 21 causes the gripping mechanism 16 to be activated via the actuator 15 as described above. It means activating it.

The handle 21 shown in FIG. 4 has a ring portion into which four fingers of one hand can be inserted into the upper end of the transmission rod 3, and a support ring portion 22 into which the thumb of one hand can be inserted from the upper end of the exterior hollow pole 2. protruding, both 21,2
By operating the transmission rods 3' and 2,
3", 3 can be moved upward.

Furthermore, the handle 21 shown in FIG.
In addition, a straight rod is installed perpendicularly through the shaft, and a thick head 23 is formed at the upper end of the exterior hollow pole 2, into which a large diameter head 24 of the transmission rod 3 is fitted. At the same time, when the transmission rod 3 is moved upward, that is, while gripping the member A', the stop pin 25 is inserted and penetrated from the thick head 23 to the large diameter head 24 to maintain the state. I have made it possible.

Next, the embodiment shown in FIG. 7 is suitable for use at the upper end of all unit members, and as in FIG. 6, a straight rod is provided through the transmission rod 3 as a handle 21, so Not only can it be used as the uppermost unit member, but if the handle 21 is removed, the transmission rod 3 is provided with a locking groove 14, and the exterior hollow pole 2 is provided with a large diameter receiving portion 2 ₁ ′ and a screw thread. Since the section 13 is formed, it is possible to connect the unit members 1, 1', etc. as already described with reference to FIG. 5, and therefore it is convenient for the operator to connect the unit members one after another. Become.

The present invention, as embodied by the above embodiments,
A plurality of required exterior hollow poles 2, 2'... are connected coaxially in the longitudinal direction, and each transmission rod 3, 3 is inserted into each of these exterior hollow poles 2, 2'... '... are removably connected by a connecting part 4 and a connected part 5 formed at their ends, and actuators 15 and Nuclear fuel A components
A gripping mechanism 16 for gripping A' is provided, and the transmission rods 3 and 3' in the connected state are provided on the uppermost transmission rod.
A handle 21 is provided which can freely open and close the gripping mechanism 16 via the actuator 15 by raising and lowering the...
The association of the above-mentioned exterior hollow poles 2, 2', . In the one formed so that it can be fixed freely by screwing it onto the part 13,
The removable connection mechanism of the transmission rods 3, 3'...
At the end of one of the transmission rods, locking connecting arms 9, 9' are pivotally attached to a mounting portion 8 fixed at the tip of the transmission rod so as to be able to move left and right, and the transmission rods 3, 3 ′...
A presser 7 fitted on the holder 7 and a spring S for pressing the presser 7 toward the distal end side are provided, and at the other end of the transmission rod, the presser 7 is moved against the elasticity of the spring S. From the open state of the locking connecting arms 9, 9' obtained by the above, to the closed state in which the presser 7 is fitted onto the arms by the elasticity of the spring S, the ends of the above-mentioned transmission rods collide with each other. In this state, the locking free end 11, of the locking connecting arm 9, 9'
11' is formed with a locking groove 14 in which the locking groove 11' is locked. Therefore, when attempting to process the member at the shallow water point _A1 of the nuclear fuel A in FIG. 2, as in the conventional example, for example, It is possible to adopt a usage mode such as connecting and connecting unit parts of one unit, and when operating the parts in deep water area _A2 , add another one and connect them.Therefore, there is no need to prepare a large number of long jigs. friend,
Since it is sufficient to prepare the required number of short unit members according to the depth of the spent nuclear fuel pool B, etc., it is convenient in terms of economy, handling, and storage.

Here, as an example of the work actually performed using the above-mentioned jig for the nuclear fuel shown in Fig. 3, after removing the upper adapter A ₃ , we will move the capsule A ₅ stacked on the guide pipe A ₄ to the top. In the case of work such as sequentially taking out capsules from A 4 and then reloading new capsules into the same pipe A ₄ , by adding unit parts at the appropriate time, it is possible to remove and load capsules A ₅ from the top stack to the bottom stack. can do.

Moreover, in the present invention, when connecting the exterior hollow poles 2, 2', etc., as described above, the state of the end faces of the adjacent exterior hollow poles is fixed by the cap nut 12, so that the length of the connection can be increased. are maintained at specified dimensions with high precision, and the transmission rods 3, 3'
. . . When the ends of the adjacent transmission rods are in an abutting state, the retaining tool 7 pressed by the elasticity of the spring S causes the locking free ends 11, 11' is locked in the locking groove 14,
The entire length of the transmission rod after the connection is also accurately maintained at a specified dimension, and as a result, the gripping mechanism 16 by the handle 21
can be operated smoothly without any hindrance.

In addition, the connection work of the transmission rods 3, 3'...
The connection work can be completed quickly by simple operations such as lifting the holding tool 7 and releasing it, and therefore the connection work can be carried out without any problems even on the workbench D of the spent fuel pool B. can.

[Brief explanation of drawings]

Figure 1 is an explanatory side view showing the usage state of a conventional spent nuclear fuel underwater handling jig, Figure 2 is a side explanatory diagram of the usage state of the jig according to the present invention, and Figure 3 is a cutaway of a part of the nuclear fuel. Figure 4 is a front view with a part of the jig cut away, Figure 5 shows the connection points of the jig, A is before connection, B is a longitudinal sectional front view after connection, and Figures 6 and 7. The figure is a longitudinal sectional front view of different embodiments showing the portion near the handle of the same tool. 2, 2'... Exterior hollow pole, 3, 3'... Transmission rod, 4... Connecting part, 5... Connected part, 7... Holder, 8... Mounting part, 9, 9'... Locking connecting arm, 1
1, 11'... Locking free end, 12... Cap nut,
13... Threaded portion, 14... Locking groove, 15... Operator, 16... Gripping mechanism, 21... Handle, A... Nuclear fuel, A'... Member, S... Spring.

Claims (1)

[Scope of utility model registration request] A plurality of required exterior hollow poles are coaxially arranged in series in the longitudinal direction, and each transmission rod inserted into each of these exterior hollow poles is connected to a connecting part formed at the end thereof. The lowermost transmission rod and the exterior hollow pole are each provided with a gripping mechanism for gripping the actuator and the nuclear fuel component at the lower ends thereof, and the uppermost transmission rod is provided with a gripping mechanism for gripping the actuator and the nuclear fuel member, respectively. A handle is provided which allows the gripping mechanism to be freely opened and closed by raising and lowering the transmission rod in the connected state via the actuator, and the continuous arrangement of the exterior hollow poles maintains the state of contact between the end surfaces of the adjacent exterior hollow poles. , which is formed so that it can be fixed by screwing a cap nut fitted into one exterior hollow pole into a threaded portion of the other exterior hollow pole, wherein the detachable connection mechanism of the transmission rod is , at the end of one of the transmission rods, on the mounting part fixed at the tip of the rod,
A locking connecting arm is pivotally attached to allow left and right movement, a presser is fitted onto the transmission rod, and a spring is provided to press the arm toward the distal end. From the open state of the locking connecting arm obtained by shifting the presser against the elasticity of the spring, to the closed state where the presser is fitted onto the arm due to the elasticity of the spring, both of the above An underwater handling jig for spent nuclear fuel, which is formed with a locking groove in which the locking free end of the locking connecting arm is locked when the ends of the transmission rods collide with each other.