JPS5821595A - Cutting method and device suitable for processing reactor component waste - 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 provides a cutting method and a cutting device suitable for processing waste materials within a nuclear reactor.

For example, fuel assemblies, control rods, and various other parts are arranged inside a nuclear reactor, but when they are used, they need to be stored in appropriate storage locations. (zirconium II), control rod (
It is required to save space by cutting materials such as stainless steel to appropriate dimensions.

However, these materials have radioactivity.

It is necessary to perform cutting work in pure water deeper than 3 meters inside the nuclear reactor.

The present invention is characterized in that cutting is performed by a discharge cutting method using the insulating properties of pure water.

Note that the so-called melt electrode arc cutting method is also similar to the discharge cutting method. It can be used as #! The arc cutting method has the disadvantage of producing a large amount of cutting waste because the entire electrode core wire is melted, but it has the advantage of being able to cut quickly.The present invention requires automatic equipment due to its purpose; however, the present invention uses electric discharge cutting. The running electrode used for this is a cassette type.
The process can be completed in about 100 minutes assuming a belt with a length of m and wire electrodes run at 20% speed.

The cassette electrode should be discarded after use.

The use of this cassette electrode is the second feature of the present invention.

Cutting debris is generated during cutting. In the discharge cutting method, the running electrode is charged with a negative charge to cut the waste material, so there is less cutting waste compared to the electrode arc cutting method, which is charged in the opposite direction. In the present invention, a water flow is applied to the cutting part from the outside of the cassette to the inside, and the water is circulated by a pump. The third feature is that it is processed together.

The external dimensions of the Naori set electrode are 56GφX according to regulations.
The size is such that it can be stored in a cylindrical container of No. 80011B, and this is the fourth feature of the present invention.

A fiftieth feature of the present invention is that the cassette electrode has a structure that allows it to be easily attached to a mounting portion of a cutting machine body suspended above the water surface.Furthermore, a sixth feature of the present invention is that the cassette electrode The main body of the machine is mounted on nine guides with the structure touching the inner wall of the water tank.

Can be raised and lowered with a small amount of power due to para/skate eight.

The electrode winding reel drive and pump are built inside, and the cutting current is controlled and fed by an electrode feed control device above the water tank to keep it constant.

An example of carrying out the present invention will be described below with reference to FIGS. 1(2), 2, and 2, in which a control rod is cut.

In the figure, 1 is an electrode cassette, 2 is an electrode wire reel, 3 is a take-up reel, 4 is a fibinch roller, 5 is a guide roller, and the electrode wire 6 is taken up by the drive device in the cutting machine B. Cut the control rod 7 by guiding it in the direction of the arrow.

(electrode cassette) is attached to the IFi cutting machine main body 8 in a replaceable manner.

A water flow is applied in the direction of the arrow from the pump 9 in the cutting machine main body 8 to the electrode cassette 1 through the filter lO, and the control
The cut layer accompanying the cutting in step 7 is accompanied by this water flow.
--'+ It dies before 11 and is collected in the electrodeposition cassette 1 and is not scattered outside.

12 is opened to receive the control rod 7, and closed to perform cutting work.

Electrode cassette 1 is the cutting machine main body 8K as shown in IIZ diagram.
The above-mentioned operation is performed by the cutting machine main body 8. The cutting machine main body 8 is guided by a guide device 13 and can be moved mainly up and down, only 1 [1], so that it can be moved axially from the center of the control rod 7 to the center and then from the other end. Cutting operations can be performed outwardly.

The cutting machine main body 8 is suspended via a wire 15 and a guide roller 16 with a 14" run weight, and
1. To be able to go up and down with a small amount of power. The cutting current is controlled to be kept constant using a 15ti electrode feed control device.

Thus, according to the present invention, the waste material inside the nuclear reactor can be automatically cut from above a safe water tank, and the cut waste is collected in the society electrode cassette and taken out and placed in a predetermined radioactive waste collection tank. This provides an extremely useful means for disposing of the wax reactor that will eventually arise.

[Brief explanation of the drawing]

The drawings show a first embodiment of the present invention, and FIG. Moreover, FIG. 2 is a side view of the device chamber body. The symbols in the drawings indicate the following members, respectively. l: Electrode cassette 2: Electrode wire reel 3: Take-up reel 4: Pinch roller 5 Guide roller 6: Electrode wire 7: Control rod 8: Cutting machine body 9: Pump
lO: Filter l: Strainer 12: Lid 13: Guide device
14: Balance Weight Patent Applicant: Yoshimitani Mitani, 1980, 1980, 1981, Patent Office Commissioner, Mr. Shimada, 1, Indication of the Case: 1980, Relationship with Patent No. 119346
Registration Permission - Hitoshi Uttr, (Name) Yoshio Mitani 6, Number of inventions increased by amendment None Contents of amendment In the specification of the present application, the following points are amended. 1. Stop "all" of the 19 lines of the third verse. I corrected myself by saying, “A lot.” (that's all)

Claims (1)

[Claims] 1. Water depth location K of 3 m or more by utilizing the candy-like properties of water.
A suitable method for cutting NiK for disposal of nuclear reactor waste material, characterized in that metal tubes are cut by a melt electrode type arc cutting method before cutting a metal tube by running a belt and a wire with an electrode 2 using a discharge cutting method. 2. Remove cutting debris from cutting on the ground! A suitable cutting method for the disposal of nuclear reactor waste material according to claim Ils No. 114, characterized in that: 3 The running electrode used for discharge cutting is a cassette type,
#The electrode cassette is replaceably attached to the cutting machine body and can be collected and disposed of after use. t-Characteristics i. Cutting device suitable for processing waste materials inside a nuclear reactor. 4. The reactor waste material according to claim 3, wherein the electrode cassette includes a cut portion to generate a water flow and collect cutting debris, and the strainer light includes a built-in filter. A cutting device suitable for the place 11. 5 The external dimensions of the # electrode cassette are 560φ according to the regulations.
A cutting device suitable for a nuclear reactor waste disposal site 11 according to claim 3, characterized in that it has a size that can be accommodated in a cylindrical container of 800 mm. 6. Front-distribution electrode power control) The electrode/reel drive device and pump are built into the removably mounted cutting machine body, and the electrode feed control device pipe for controlling the cutting current is mounted above the water tank. A cutting device suitable for processing nuclear reactor waste material according to claim 3. 7. Reactor waste material according to claim 113, characterized in that the sand is suspended in water via the cutting machine main body tpara/skate 1, and the sand can be moved up and down and in the front and rear directions by a guide device. A cutting device suitable for processing.