JPH07140275A - Nuclear fusion devce repairing method and devce therefor - Google Patents

Abstract

PURPOSE:To shorten workhours and change the armor-tile of a divertor without spoiling the reliability of the divertor. CONSTITUTION:The armor-tile 12 and cooling tube 13 of a divertor 6 fixed through wax material into the vacuum container of a nuclear fusion device generating nuclear fusion reaction with the high temperature plasma of deuterium and tritium sealed therein are heated by applying a current to a heating coil 16 from an AC power 25 to melt the wax material 15, thus removing the armor-tile 12 from the cooling tube 13. The removed armor-tile 12 is gripped by an armor-tile grip arm 19 and taken out of the vacuum container. In the case of fitting the armor-tile 12 into the vacuum container, fitting is performed in the reverse procedure to the removing case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a nuclear fusion device for repairing a first wall and a diverter provided in a vacuum container of the nuclear fusion device, and an apparatus therefor.

[0002]

2. Description of the Related Art An outline of a nuclear fusion device (also called a nuclear fusion reactor) will be described with reference to FIG. In the figure, reference numeral 1 is a vacuum container, in which a blanket 3 is arranged so as to surround the plasma 2, and a diverter 6 is formed at a position where magnetic lines 11 surrounding the plasma 2 are concentrated.

A first wall 5 made of stainless steel is provided as a plasma facing device on the surface of the blanket 3 on the plasma 2 side, and a diverter 6 is attached to the first wall 5. A toroidal coil 7 and a poloidal coil 8 are provided outside the vacuum container 1. In the figure, 9 is a vacuum exhaust system, and 10 is a horizontal port.

These structures form a torus-shaped space and can contain the plasma 2 composed of deuterium and tritium by a magnetic field generated by the toroidal coil 7, the poloidal coil 8 and the like. Deuterium-tritium reaction D + T → 2He (3.5eV) + n
We are considering using (14.1 eV).

The diverter 6 is used as an impurity removing device for discharging helium produced by the fusion device and unburned combustion gas to the outside of the furnace.
The magnetic field lines 11 are extended to the outside of the chamber to irradiate the surface of the diverter 6 with ions of helium or the like flowing along the magnetic field lines to neutralize the magnetic field lines, and the vacuum exhaust system 9 exhausts the magnetic field lines 1 to the outside.
Therefore, the diverter 6 is in an environment where it receives a lot of heat and particles.

The structure of the diverter 6 will be described with reference to FIGS. In addition, Fig. 3 shows I-TER DOCUMENTATION
It is quoted from SERIES NO.34 (P27), FIG. 3 shows a side surface of the diverter 6, and FIG. 4 shows a main part of the diverter 6 in a perspective view.

The diverter 6 is composed of an armor tile 12 made of high melting point material such as graphite for protecting heat from the plasma 2 and a cooling pipe 13 made of steel having high heat conductivity for removing heat. A cooling fluid circulates inside the cooling pipe 13. The diverter 6 receives a heat load of 15 MW / m ² during operation. In this way, the diverter 6 is loaded with high heat and high particles from the plasma 2, and the armature 12 is quickly consumed, so that the diverter 6 needs to be replaced most frequently.

Tritium (T) used as a material for the plasma 2 is a radioactive substance having a half-life of 12 years, and since the neutrons generated by the fusion reaction activate the internal structure of the reactor, the radiation dose in the reactor is It is expensive and requires remote control using robots to replace damaged diverter armor tiles.

A conventional method of replacing a diverter by remote control will be schematically described with reference to FIG. Fig. 5 shows ITER D
It is quoted from OCUMENTATION SERIES NO.34 (P34).

That is, in FIG. 5, the replacement manipulator 14 is inserted into the vacuum container 1, and the entire diverter 6 damaged by the replacement manipulator 14 is directly removed to be carried out from the horizontal port 10 to the outside of the vacuum container 1. Take the entire new diverter 6 from the horizontal port 10 to the vacuum container 1
Manipulator 14 for carrying in and diverter 6 for replacement
It is attached by.

[0011]

As described above, when the damaged diverter 6 is replaced by remote control, the diverter 6 needs to be taken out of the vacuum container through the horizontal port 10, so that the working time becomes long. Also, the diverter 6
Since it is necessary to cut the cooling pipe 13 and the like, the armature 12 and the cooling pipe 6 must be re-welded when a new diverter is installed. Furthermore, there is a risk that water leakage may occur from the re-welded portion, and the reliability of the fusion device is significantly impaired.

The present invention has been made to solve the above-mentioned problems, and by exchanging only the armor tile without taking out the entire diverter to the outside of the vacuum container, the working time required for the work is shortened and the cooling is performed. Cutting the pipe,
(EN) It is an object of the present invention to provide a repair method for a fusion device and an apparatus therefor which does not require re-welding with an armor tile and can replace an armature without impairing the reliability of a diverter and which has easy workability.

[0013]

According to the present invention, the armature of a diverter fixed by a brazing material in a vacuum vessel of a nuclear fusion apparatus for confining high temperature plasma of deuterium and tritium to cause a nuclear fusion reaction is induction-heated or microwaved. By heating, the armature is heated to melt the brazing material, and only the armature is detached and replaced.

Further, the present invention relates to a repair device for a nuclear fusion device for repairing an armor tile fixed with a brazing material in a vacuum container of a nuclear fusion device for confining high temperature plasmas of deuterium and tritium to cause a nuclear fusion reaction, A repair manipulator configured by an armature detachable manipulator and a heating manipulator having an induction heating coil at the tip is installed in the vacuum container, and the induction heating coil is connected to an AC power source. .

[0015]

In the fusion reactor repairing method and apparatus according to the present invention, a heating coil is installed on the entire surface of the armature to be replaced, and an electric current is passed from the AC power supply to the coil to generate a magnetic field to fix the armature. The material is directly induction-heated and melted. When the brazing material has melted, remove the armature from the cooling pipe, grab the armature and carry it out of the vacuum container.

Thus, only the armor tile can be removed without carrying the diverter out of the vacuum container. When installing a new armor tile, reverse the procedure for removing it.

Further, by providing a detachable manipulator having a jig for attaching and detaching the armature,
All armature exchanges can be done remotely.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of repairing a fusion device and an embodiment of the device according to the present invention will be described with reference to FIGS.

In FIG. 1, the back surface of the armature 12 is fixed to the cooling pipe 13 of the diverter 6 in the vacuum container 1 shown in FIG. 2 by a brazing material 15. The armature 12 is provided with a heating coil 16 to provide the armature 12. The state of heating
Armature tile 12 removed from cooling tube 13 is attached to the armature tile of armature tile attachment / detachment manipulator 18
It shows the state of gripping at 19.

The cooling pipe 13 is intended to remove heat from the diverter 6. The armature detachable manipulator 18 is a main part of the repair manipulator 17.

That is, the repair manipulator 17 is attached to the moving rail 20 in the vacuum container 1 shown in FIG. The repair manipulator 17 is provided with an armature detaching / manipulating manipulator 18 and a heating manipulator 21.

The armature detaching / manipulating device 18 has a pair of bendable jig arms 23 having a jig 22 at the tip thereof.
And an expandable armatile gripping arm 19 having a suction cup 24 for sucking and gripping the armature 12.

The heating manipulator 21 has a heating coil 16, and the heating coil 16 is connected to an AC power supply 25. The alternating current power supply 25 supplies alternating current to the heating coil 16.
The heating coil 16 is for inductively heating the armor tile 12 and the brazing material 15 to melt the brazing material 15.

In the above device, however, the induction heating coil 16 is installed in front of the armature 12 to be replaced due to damage, and the coil 16 is energized by the alternating current 25 to generate a changing magnetic field. Induce an electric current.

Due to the action of this electromagnetic induction, the armature
12 and the brazing filler metal 15 are heated, and as a result, the brazing filler metal 15 fixing the armature 12 to the cooling pipe 13 melts and the armature tile
12 is ready to be removed. In this state, the jig for attachment / detachment / fixation fixed to the jig arm 23 of the manipulator 18
Remove the damaged armor tile 12 via 22.

Then, the suction cup 24 of the armatile gripping arm 19 is brought into contact with the upper surface of the armature 12, and the inside of this arm 19 is sucked to grip the armature 12, and in this gripped state, for example, the horizontal position of the vacuum container 1 shown in FIG. Move it to the position of port 10 and put the armature 12 from this horizontal port 10 to the vacuum vessel 1.
Take it out.

When the armature 12 is mounted in the vacuum container 1, the reverse operation is performed, so that the armator tile 12 alone can be replaced by the complete isolation operation without removing the entire diverter 6.

In this way, the diverter 6 is attached to the vacuum container 1
Since only the damaged armor tile 12 can be replaced without taking it out of the fusion reactor, that is, the work time can be shortened. Further, there is no need to cut and re-weld the cooling pipe in order to take the diverter 6 out of the furnace and replace it. Therefore, the repair can be performed without impairing the reliability of the diverter 6.

Further, a microwave heating antenna and a microwave oscillator may be installed in place of the induction heating coil 16 and the AC power supply 25 for energizing the coil. That is, the repair manipulator 17 is composed of an armature detachable manipulator 18 and a heating manipulator 21 having a microwave heating antenna.

A microwave oscillator is installed outside the vacuum container to the microwave heating antenna, and high-frequency power is supplied from the microwave oscillator. As a result, the same effect as the above embodiment can be obtained.

Further, the armature detaching manipulator has an opening for a suction pump which is connected to an exhaust pump installed outside the vacuum container of the armature grasping arm 19 of the vacuum container 18, and when the armature 12 is attached or detached, the armature 12 is removed by a suction force. Is fixed to the armature gripping arm 19.

Adhesive is applied to the end of the gripping arm 19 instead of the suction cup 24 of the gripping arm 19 on the armor tile 12 of the armature detaching / manipulating manipulator 18, and the suction device is attached to the gripping arm 19 of the armature tile 12. May be removed by.

Alternatively, a suction device may be attached to the gripping arm 19 so that the armature 12 may be removed by suction, and the armature 12 to be replaced may be drilled to form a claw (not shown). Then, the armature 12 may be removed by hooking the jig 22 on the nail.

When a new armor tile 12 is attached in place of the taken out armor tile 12, a foil-like brazing material 15 is placed on the cooling pipe 13 at the part where the armor tile 12 is taken out, and the brazing material 15 is used in addition to the above method. The armature 12 may be placed on the top of the manipulator, the brazing material 15 may be melted by induction heating using an induction heating coil or the like, and then the brazing material 15 may be allowed to cool, and the cooling pipe 13 and the armature 12 may be adhered to each other by the brazing material 15.

In addition, a cooling pipe for the armature 12 in advance
A liquid brazing material 15 may be coated on the portion to be adhered to the armature 13, the armature 12 may be placed on the cooling pipe 13, and the armature tile 12 and the brazing material 15 may be heated by induction heating and then allowed to cool to adhere them. One method is to press the armature 12 with the induction heating coil 16 in order to bring them into close contact.

[0036]

According to the present invention, by directly heating the brazing material for fixing the replacement armor tile,
Since the brazing material melts and only the armor tile can be removed or attached, the armor tile can be replaced without taking out the diverter from the vacuum container.

Therefore, cutting of the diverter cooling pipe for taking out the diverter from the vacuum container and re-welding for mounting the diverter in the vacuum container are unnecessary. Therefore, the work time required for the work can be reduced, and the diverter can be repaired without impairing the reliability of the diverter.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining a method for repairing a nuclear fusion device and an embodiment of the device according to the present invention.

FIG. 2 is a longitudinal sectional view schematically showing the inside of the nuclear fusion device in a partial side view.

FIG. 3 is a side view showing the diverter in FIG.

FIG. 4 is a perspective view showing a relationship between the armature and the cooling pipe in FIG.

FIG. 5 is a schematic plan view for explaining a conventional diverter replacement method.

[Explanation of symbols]

1 ... Vacuum container, 2 ... Plasma, 3 ... Blanket, 4 ...
Missing number, 5 ... First wall, 6 ... Diverter, 7 ... Toroidal coil, 8 ... Poloidal coil, 9 ... Vacuum exhaust system, 10 ... Horizontal port, 11 ... Magnetic field line, 12 ... Armature, 13 ... Cooling pipe, 14 ... Replacement manipulator , 15 ... Brazing filler metal, 16 ... Heating coil, 17 ... Repair manipulator, 18 ... Armatile attachment / detachment manipulator, 19 ... Armatile gripping arm, 20 ... Rail for moving, 21 ... Manipulator for heating, 22
… Jig, 23… Jig arm, 24… Sucker, 25… AC power supply.

Claims (4)

[Claims] 1. An armor tile of a diverter fixed by a brazing material is heated by induction heating or microwave heating in a vacuum container of a nuclear fusion device for confining high temperature plasma of deuterium and tritium to cause a nuclear fusion reaction. A method for repairing nuclear fusion, characterized in that the brazing filler metal is melted, and only the armature is detached and replaced. 2. A repair device for a nuclear fusion device for repairing an armature fixed with brazing material in a vacuum container of a nuclear fusion device for confining a high temperature plasma of deuterium and tritium to cause a nuclear fusion reaction. A fusion manipulator having a repairing manipulator configured with an armature detachable manipulator and a heating manipulator having an induction heating coil at the tip, and the induction heating coil being connected to an AC power source. Equipment repair device. 3. The repair manipulator includes an armature detachable manipulator and a heating manipulator having a microwave heating antenna, and a microwave oscillator for supplying high frequency power to the microwave heating antenna is provided in the vacuum container. The repair device for a nuclear fusion device according to claim 2, wherein the repair device is installed outside the. 4. The armature dismounting manipulator has an opening of a suction pump connected to an exhaust pump installed outside the vacuum container, and an armature gripping arm for holding the armature tile by a suction force when the armature is attached and detached. The fusion device repairing device according to claim 2 or 3, wherein the repairing device has a function of fixing to the fusion device.