JPS6330795A - Fuel charging cage conveyor for continuous melting treater - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fuel loading cage transfer device for a continuous melting and processing device for spent nuclear fuel, and is particularly required for a horizontal rotation system. The present invention relates to a device suitable for lifting and lowering a fuel-loaded basket, and for accurately carrying out transfer and hull removal operations.

[Conventional technology]

The mechanism for taking out cladding tubes in a conventional rotary continuous melting processing device is as described in Japanese Patent Application No. 55-177054, in which a material loading basket is rotated in the vertical direction for melting, and the cladding tubes inside are removed. The fuel basket is dropped by gravity and dumped, and there is no need for a manipulator to take out the fuel-loaded basket to the outside. but.

With this method, there is a concern that the path may become clogged, and furthermore, it is not safe enough because the dumping process cannot be observed from the outside.

[Problem that the invention seeks to solve]

Nuclear fuel that releases energy through a nuclear fission reaction in a nuclear reactor, consumes fissile material, and is no longer suitable for use is generally referred to as spent nuclear fuel. Reprocessing is the process of recovering and reusing the fissile material and nuclear raw material contained in this spent nuclear fuel.

The reprocessing process further consists of a wide variety of unit steps, in the first step of which, in the Purex process, the fuel rods are sheared into small pieces and the nuclear fuel material inside is subsequently dissolved in nitric acid. The coating material of this fuel piece is generally zirconium alloy or stainless steel, so it does not dissolve in nitric acid.
After the nuclear fuel material has finished melting, it can be separated.

There are two methods for melting nuclear fuel: the so-called batch method, which adds the necessary amount of nitric acid to a corrosion-resistant container loaded with nuclear fuel, completes the fuel melting, and then takes out the dissolved liquid, and the other method, which melts while loading nuclear fuel and nitric acid into the container. Continuous method for extracting liquid,
There is also a semi-continuous system which is a compromise between the two.

In general, the continuous type has higher efficiency than the batch type, but there is a problem in removing insoluble materials such as coating materials.As a solution to this problem, a device for continuously processing the treated materials is described in Japanese Patent Application No. 177054/1983. was devised. However, because this device has a vertical structure, it is disadvantageous in terms of earthquake resistance.
Due to the complicated structure, there is a concern that the coating material may clog the path. Moreover, it is impossible to confirm this visually from the outside.

In order to avoid clogging by the coating material, multiple fuel loading baskets loaded with fuel pieces are immersed in the melting solution in a circular melting container held horizontally, and the fuel loading baskets are sequentially moved in one direction along the circumference. Research and development is progressing on continuous melting processing equipment that is characterized by its ability to move. As a known example, there is a continuous nuclear fuel melting treatment apparatus described in Japanese Patent Application No. 60-9060. With this device, the cladding tube is dumped outside so it can be seen with the naked eye.

FIG. 1 is a schematic diagram of a dissolution processing container portion of a continuous dissolution processing apparatus which has been improved based on the continuous dissolution processing apparatus described in the above-mentioned Japanese Patent Application No. 60-9060. Regarding the circumferential movement of the fuel car, the fuel car is moved counterclockwise by one station every hour and by 30 degrees of center angle. This movement itself is carried out in a short period of time, and loading of fuel pieces, dumping of cladding material, etc. are completed within the remaining stationary time. The time required from the start of loading fuel chips to the removal of the fuel loading basket is 9 hours.

As shown in Figure 2, the annular container has two partition walls (one partition completely partitions off the solution in the annular container, and the other partition has a gap at the bottom for the solution to pass through). ), and in the partitioned part, N¥! After washing off the nuclear fuel material adhering to the
The residual wave rIl\P is taken out of the annular container and dumped.

Due to the above-described structural characteristics of the annular container, it is necessary to use a manipulator to lift and lower the fuel loading basket, horizontally translate it, and dump the cladding tube. Special request 1975
In the case of the rotary continuous melting treatment apparatus described in Publication No. 5-177054, the fuel loading basket is rotated in the vertical direction,
The Pi pipes in it are designed to be simply dumped by falling due to gravity.

There is no need to take the fuel loading basket out of the container. Therefore, the processing operation using the manipulator is the most distinctive and most important operation among the operations in the horizontally rotating continuous melting processing apparatus. Our goal is to develop a new car transport manipulator and provide it in a concrete form.

Means for Solving Problem C] The present invention relates to a fuel loading cage transport manipulator in a horizontally rotating continuous melting and processing apparatus for spent nuclear fuel. As a manipulator, we considered one that lifts and lowers the fuel loading basket in the vertical direction, and another that moves the fuel loading basket horizontally and rotates and reverses when taking out the cladding tube. make it happen.

The operation of the manipulator for lifting and lowering in the vertical direction can be achieved by vertical movement using an air cylinder and gripping and releasing using a combination of a rotary actuator and a worm gear.

The operation of the manipulator for horizontal movement, rotation, and reversal of the fuel loading basket includes loading and unloading of the fuel loading basket using an air cylinder, gripping and releasing using a combination of a rotary actuator and a worm gear, and rotating and releasing the gripping and releasing portion using another rotary actuator. This can be achieved by inversion. Moreover, by driving an electric motor, this manipulator main body can be moved on the pedestal rail, and the fuel loaded basket can be transported along the circumference of the annular container.

[Effect]

A manipulator for lifting and lowering grasps and releases a fuel-loaded car by opening and closing a claw from inside the car. Thereby, interference with the manipulator for horizontal movement and rotation/reversal can be avoided. Also,
Since the gripping and releasing operation uses a worm gear, it is advantageous in terms of strength and there is less burden on the rotary actuator.

Manipulators for horizontal movement, rotation and reversal are used for lifting and
Moving forward and backward with respect to the hanging manipulator,
It moves along the circumference of the annular container while remaining in the retreated state, grips and releases the fuel loading basket from the outside, and rotates and reverses the grip and release part for discarding the cladding tube while moving in the circumferential direction. The forward and backward movements are performed after confirming that the manipulator for lifting and lowering does not get caught in the fuel loading basket. The gripping and releasing action is performed by a worm gear, similar to the lifting/lowering manipulator.

1 for rotation and reversal operation of the grip release part for cladding pipe disposal.
The rotation angle is 200 degrees and the cladding tube is completely discarded by swinging it upward.

〔Example〕

The present invention will be explained in detail below.

FIG. 1 is a perspective view of the entire horizontal rotary continuous dissolution processing apparatus.

The continuous dissolution processing device consists of a main body side plate 1, a dissolution processing liquid (
Nitric acid)2. Water tank 3, fuel loading tank 4 and annular frame for suspending it 5. A melting processing section consisting of a heating/cooling jacket 13, a rotation drive device 6 for moving the annular frame 5 in the circumferential direction, a positioning device 7 for stopping and positioning the annular frame 5, and a fuel cage lifting/lowering device. It can be divided into an external operating section consisting of a manipulator 8 for horizontal movement of the fuel basket, a manipulator 9 for horizontally moving the fuel basket, and a manipulator 9 for rotating and reversing the fuel basket, and its stand 10.In addition, there is a cladding tube dumping port 11 into which the cladding tubes remaining after melting is completed. , there is a partition plate 12 that separates the fuel loading basket take-out section, cleaning section, and return section 6 In Fig. 1, the fuel loading basket 5 is rotated counterclockwise when viewed from above, and the dissolving treatment liquid 2 is reversely moved. Dissolve the fuel by flowing it clockwise.

FIG. 2 is a perspective view of the melting processing section of the continuous melting processing apparatus shown in FIG. 1, viewed from the direction of the area where the fuel loading valve 4 is taken out and transported.

The dissolution processing section has partition walls 14 and partition walls 15. A gap is provided at the bottom of the partition wall 14 between the fuel loading/unloading section and the cleaning section, and the dissolving treatment liquid 2 flows through the gap. A partition wall 15 between the other washing section and the return section completely blocks out rain noise. Because of this structure, it is necessary to consider a method of transporting the fuel-loaded basket as shown by the arrow in FIG. What has been devised to realize this operation is a manipulator 8 for lifting and lowering the fuel loaded car, and a manipulator 9 for horizontally moving and rotating/reversing the fuel loaded car.

FIG. 3 is a structural diagram of a manipulator 8 for lifting and lowering a fuel-loaded car according to an embodiment. The device basically consists of a part for gripping and releasing the fuel loading valve 4 and a part for raising and lowering it. The gripping/releasing portion is mainly a rotary actuator 16 and a worm 17. Arm 1
9, a claw 20, and a worm wheel 21. When the rotary actuator 16 is driven, the worm 17 rotates, and the worm wheel 2 engaged with the worm 17 rotates.
An arm 19, which is screwed to 1, performs opening and closing operations as shown by the arrows in FIG. The arm 19 is in a closed state when the fuel loading basket 4 is not suspended, but when the fuel loading basket is suspended.

The arm 19 is closed, and the claw 20 attached to the tip of the arm 19 supports the fuel loading basket 4 from inside.

A hole for inserting a claw 20 is provided in advance in the fuel loading tank. Next, the gripping/releasing part is raised and lowered by an air cylinder 24.

FIG. 4 is a plan view and a side view of the manipulator 9 for horizontally moving and rotating/reversing the fuel car according to this embodiment, as seen from above.

The operations of this manipulator 9 include moving along an arc on the pedestal 10, advancing and retreating with respect to the melting processing section, gripping covered by the plate 26, 1! The purpose of this operation is to rotate and reverse the lid portion, and to grip and release the fuel loading basket 4 using the arm 27 and claw 28.

The arc movement on the pedestal 10 is achieved by attaching a gear 38 to an electric motor 36 attached to the underside of the bed 34 and driving it by engaging it with a gear 37 on the outer surface of the pedestal 10. 35. By using guide rollers 39, smooth movement is possible. Note that a mechanical stopper 39 is attached to the pedestal 10 to prevent it from falling.

Next, the forward and backward movements with respect to the melting processing section are performed by expanding and contracting the air cylinder 31. That is, bed 3
On the rail 32 of 4, the base 25 and the device mounted thereon can be slid back and forth via the LM guide 33.

Rotation and reversal of the grip/release portion are performed by driving the rotary actuator 30 and transmitting the rotation to the grip/release portion through the bearing case 29. The angle of rotation is determined by the specifications of the rotary actuator, but gears or the like can be used to change the speed if necessary.

The gripping and releasing movements by the arm 27 and the claw 28 are performed in exactly the same manner as the gripping and releasing movements of the manipulator for lifting and lowering the fuel-loaded car.

FIG. 5 shows the details of the part that performs this gripping/releasing movement, but basically the rotary actuator 44 is driven to rotate the worm 42, and the worm wheel 43 engaged with it is rotated by the rotary actuator 44. Move the arm to achieve the movement of the arm as shown by the arrow in Figure 5. However, in the case of this device, the fuel loading cage 4 is supported from the outside.

〔Effect of the invention〕

The following effects are expected from the present invention.

(1) It is possible to safely and reliably dump the cladding tube remaining after melting by remote control.

(2) The structure is relatively simple, compact, and structurally stable.

(3) It is possible to detect the dumping of the yl tube from the outside, and it is possible to improve safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the entire horizontal rotary continuous melting processing equipment, Fig. 2 is a perspective view of the welding processing section in Fig. 1, and Fig. 3 is an embodiment of the present invention for lifting and lowering a fuel loading basket. 4 is an outline drawing of a manipulator for horizontal movement and rotation/reversal of a fuel loading car according to an embodiment of the present invention. FIG. It is a detailed view. DESCRIPTION OF SYMBOLS 1... Body side plate, 2... Dissolution processing liquid, 3... Water tank, 4... Fuel loading basket, 5... Annular frame, 6...
... Rotation drive device, 7... Positioning device, 8... Manipulator for lifting/hanging, 9... Manipulator for horizontal movement and rotation/reversal, 10... Frame, 11.
... Cladding tube inlet, 12 ... Partition plate, 13 ... Jacket, 14 ... Partition wall, 15 ... Partition wall, 16 ...
・Rotary actuator, 17... Worm, 18
...rocker plate. 19... Arm, 20... Claw, 21... Worm foil, 22... Shaft, 23... Key, 24
...Air sill ring, 25...Base, 26...Plate, 27...Arm, 28...Claw, 29...
・Bearing case, 30...Rotary actuator, 31...Air cylinder, 32...Rail, 33...
...LM guide, 34...Bed, 35...Roller, 36...Electric motor, 37...Gear, 3rd...
Gear, 39... Kite roller, 40... Cover, 4
1... Holder, 42... Worm, 43... Worm foil, 44... Rotary actuator unit/3-
Ghent ZflD Part 3

Claims (1)

[Scope of Claims] 1. A plurality of corrosion-resistant fuel loading baskets are arranged in a horizontal annular container holding a dissolution treatment liquid, and the lower portions of the fuel loading baskets are immersed in the dissolution treatment liquid while rotating in one direction sequentially. This continuous melting treatment equipment melts nuclear fuel by melting nuclear fuel within the effective range of the continuous melting treatment equipment, which has a manipulator for lifting and lowering the fuel loading basket, and a manipulator for horizontally moving and rotating/reversing the fuel loading basket. A fuel loading basket transport device for a continuous melting treatment device, which transports and dumps residue. 2. A fuel loading basket conveying device for a continuous melting treatment apparatus according to claim 1, characterized in that the radiation resistance is improved by driving the device by an air cylinder and a rotary actuator. 3. A fuel loading basket conveying device for a continuous melting treatment apparatus according to claims 1 and 2, characterized in that the rotational movement of the rotary actuator is caused to perform gripping and releasing operations by using a worm. 4. In claims 1, 2, and 3,
The former opens the fuel loading basket from the inside, the latter from the outside.
A fuel loading basket conveying device for a continuous melting processing device, which is characterized by gripping and releasing operations using claws having a special shape. 5. In claims 1, 2, 3, and 4, the gripping/releasing part always moves toward the center of the melting processing section and advances and retreats toward the center. 1. A fuel loading basket conveying device for a continuous melting treatment device, characterized in that the gripping and releasing portion is rotated and reversed at a fixed angle at a predetermined location using a rotary actuator.