JPS6147398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a device for replacing capsules for irradiation tests in nuclear experimental reactors.

B. Prior Art In general, nuclear experimental reactors are installed in a pressure vessel in a water tank to suppress radiation. A capsule storage pipe is attached to the nuclear experimental reactor, and an irradiation test capsule (hereinafter referred to as "capsule") is provided in the capsule storage pipe so that it can be stored and taken out. The capsule contains electrical wires to control the conditions inside the experimental reactor and send data, as well as metal pipes to send cooling water and helium gas. In addition, one end of a control tube is fixedly connected to the upper end of the capsule, and the electric wires and metal pipes inside the capsule are connected to the aquarium via the electric wires and metal pipes installed inside the control tube. It is pulled outside.

Conventionally, in order to replace a capsule, a crane is installed above the water tank, and the capsule that has been stored in the experimental reactor is lifted up by the crane and moved out of the water tank. Then, the new capsule, which had been previously stored outside the water tank, was lifted up by a crane and stored in the capsule storage pipe of the experimental reactor.

C. Problems to be Solved by the Invention However, as mentioned above, the control tube has great rigidity because it contains metal pipes such as stainless steel and many electric wires. It was a common type with a hook. Therefore, when lifting a capsule and performing replacement work, the capsule or control tube may shake, and especially the control tube may move unexpectedly and be stored in another control tube, capsule, or water tank. There is a risk that the replacement work will not be carried out smoothly and the equipment, equipment, etc. may be damaged due to vibrations caused by contact with the equipment, equipment, etc., or excessive load being applied to the capsule. Therefore, when replacing the capsule, an operator has to drain all the water in the water tank, enter the tank, and manually replace the capsule, making the replacement work extremely complicated.

D. Means for solving the problems In order to solve the conventional problems as mentioned above,
The present invention relates to a nuclear power plant that uses a crane to replace an irradiation test capsule that can be stored and taken out in a capsule storage tube of a nuclear experimental reactor installed in a pressure vessel in a water tank and that has one end of a control tube fixedly connected to the capsule storage tube. In a device for replacing capsules for irradiation tests in experimental reactors, a capsule storage member capable of storing an appropriate number of the capsules is fixed to the inner wall of a water tank, the control tube is twisted in the circumferential direction, and the control tube is installed above the water tank. A crane is installed to be movable in the horizontal direction, and the crane has a guide rod extending vertically, and has an arm whose base is guided by the guide rod and can move up and down, and the tip of the arm and the capsule The upper end of the holder is detachably attached to the upper end of the holder.

E Effect In the capsule exchange device with such a configuration,
The arm of the crane moves horizontally as the crane body moves horizontally, and moves up and down guided by the guide rod. That is, the arm moves on a constant trajectory without wobbling. Therefore, the capsule lifted and moved by this arm will not sway. In addition, since the control tube fixedly connected to the capsule is twisted in the circumferential direction, its movement during lifting and movement of the capsule is restricted, and unlike conventional control tubes, due to its rigidity, unexpected I never exercise.

This allows the capsule to be replaced automatically without the need for the operator to drain the water in the tank and enter the tank to perform the work.
Furthermore, instruments, devices, etc. are not damaged due to shaking of the control tube, etc.

F Example Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

In Figure 1, 1 is the experimental nuclear reactor.
It is provided in a pressure vessel 3 disposed in a water tank 2 to block radiation. Reference numeral 4 designates a capsule for irradiation testing of the experimental reactor 1, which is installed in a capsule storage pipe 5 that is inserted and supported into the experimental reactor 1 from the upper mouth of the pressure vessel 3 so as to be freely stored and removed. Note that a position detector 6 is provided at the mouth of the pressure vessel 3 and is used to detect the position of the capsule 4. Capsule 4 contains not only fuel, but also electric wires to control the conditions inside the experimental reactor and send data, as well as metal pipes to send cooling water and helium gas. etc. can be drawn out via a control tube 7. The inside of the control tube 7 is constructed by, for example, as shown in FIG. 3, various types of electric wires 8 are arranged in a concentrated manner in the center, and a pipe 9 for sending helium gas is spirally wound around the electric wires 8. ing. In addition,
Reference numeral 10 denotes a jacket tube, which is made of a rubber member or the like having good radiation resistance, heat resistance, and water resistance. One end of the control tube 7 is fixedly connected to the capsule 4 via a joint 11.

Reference numeral 12 denotes a crane for replacing the capsule 4, which is provided so as to be movable in the front-back direction (left-right direction in FIG. 1) via a traveling trolley 13a, and in the lateral direction via a lateral moving trolley 13b. It is configured to be movable in the vertical direction (in the direction perpendicular to the plane of the paper in FIG. 1). Note that 14 and 15 are guide rails. A guide rod 17 is vertically installed at the front part of the crane body 16 (on the right side in FIG. 1), and the guide rod 17 has a support part at its tip that can freely support the operating rod 18 of the capsule 4. A base portion of an arm 20 having an arm 19 is attached to the arm 20 so as to be vertically movable. 21 indicates that one end thereof is connected to arm 2.
A wire rope fixed to the wire rope 0 is engaged with the grooves on the outer periphery of an appropriate number of pulleys 22, 22 provided on the upper part of the crane main body 16, and the other ends are fixed as shown in FIGS. 1 and 2. Drive device 2
3, and by driving a drive device 23, the arm 20 can be moved up and down. The reference numeral 24 indicates a position detector provided at an appropriate portion of the guide rail 14, the reference numeral 25 indicates a detachable member provided at the upper end of the capsule 4, and the reference numeral 25 indicates a detachable member provided at the upper end of the capsule 4. It is configured to be detachable.

Reference numeral 26 indicates a storage device for the capsule 4, which is provided at a suitable portion of the inner wall surface 27 of the water tank 2, and is constructed as follows. That is, what is shown by 28 is a storage member that can freely store a plurality of capsules 4, and is locked and fixed to the upper part of the water tank 2.
The storage member 28 has a storage section 28a formed horizontally.
A plurality of storage tubes 28b each capable of storing one capsule 4 are vertically provided on the lower surface of the storage portion 28a. In addition,
Reference numeral 29 indicates a reinforcing member.

A plurality of capsules 4 are stored in the storage member 28, and in this storage state, the control tube 7 of the capsule 4 is twisted approximately once in the circumferential direction as shown in FIG.
7b is formed. The twisted portions 7a and 7b are twisted to the right and left in opposite directions. Further, since the pipe 9 in the control tube 7 has a restoring action, the pipe 9 of the control tube 7 having a right-handed twisted portion 7a has a so-called S-wound, and the control tube 7 has a left-handed twisted portion 7b. The pipes 9 are each wound in a so-called Z winding.

In the capsule exchange device having such a configuration, the arm 20 of the crane 12 is connected to the crane 1.
2, it operates without any shaking during operation. Therefore, the operating rod 18 at the tip of the arm 20
The connection work between the capsule 4 and the capsule 4 can be carried out stably without the need for the operator's hands each time, and when the capsule 4 is lifted and moved, the capsule 4 does not shake and can be stored in the capsule storage pipe 5. Work can be performed stably and reliably.

On the other hand, the end of the control tube 7 connected to the capsule 4 is also connected to the arm 2 in the same manner as the capsule 4.
Since the control tube 7 is twisted in the circumferential direction, the movement of the control tube 7 is regulated and its movement range can be predicted to some extent. That is, the crane 12
In the process of lifting the capsule 4, the control tube 7 extends against the twist so that the twisted portions 7a and 7b are unwound, and for example, in the process of storing the capsule 4 in the storage tube 28b, the control tube 7 7 is the twist part 7 again
a, 7b will be formed. Here, the twisted control tube 7 has more restricted movement and less shaking than one that is not twisted at all.

G Effects of the Invention As described above, according to the capsule exchange device of the present invention, a capsule storage member is provided in the water tank,
By twisting the control tube in the circumferential direction, a crane equipped with an arm that can be detachably attached to the upper end of the capsule and move in a straight line is installed above the aquarium so that it can be moved horizontally. Capsule replacement work can be automatically and stably and reliably performed without the operator pulling out the capsule and entering the water tank, improving work efficiency. Furthermore, since the movement of the control tube is regulated and shaking is extremely reduced, instruments, devices, etc. will not be damaged. Furthermore, since the space in the aquarium is used to store the capsules, space efficiency is also increased.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the exchange device of the present invention, FIG. 2 is a plan view of the main parts in FIG. 1, and FIG. 3 is a cross-sectional plan view of the control tube in FIG. 1. 1... Nuclear experimental reactor, 2... Water tank, 3... Pressure vessel, 4... Capsule, 5... Capsule storage pipe, 7... Control tube, 12... Crane,
17... Guide rod, 20... Arm, 25... Detachable member, 27... Inner wall surface, 28... Storage member.

Claims (1)

[Scope of Claims] 1. Replacement of an irradiation test capsule with a crane, which can be stored and taken out from a capsule storage tube of a nuclear experimental reactor installed in a pressure vessel in a water tank, and one end of a control tube is fixedly connected to the capsule storage tube. In a device for replacing capsules for irradiation tests in a working nuclear experimental reactor, a capsule storage member capable of storing an appropriate number of the capsules is fixedly installed on the inner wall surface of a water tank, and the control tube is installed in a circumferentially twisted state, A crane located above the aquarium is provided so as to be movable in the horizontal direction, and the crane has a guide rod extending in the vertical direction and an arm whose base is guided by the guide rod and can move up and down. A device for replacing a capsule for irradiation tests in a nuclear experimental reactor, characterized in that a tip part and an upper end part of the capsule are detachably provided.