JPH0519076A - Nuclear fusion reactor - Google Patents

Abstract

(57) [Summary] [Purpose] Quickly open and close the movable shield plug that opens and closes the insertion port. [Structure] Movable shield plug 1 for opening and closing the insertion port 111
A hydraulic cylinder drive device 3 for rapidly opening and closing is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tokamak type fusion reactor, and more particularly to a fusion reactor provided with a drive device for driving a movable shield plug for opening and closing an insertion port for inserting an in-reactor observation device into the reactor. Regarding

[0002]

2. Description of the Related Art Conventionally, as an example of this type of fusion reactor, there is one constructed as shown in a partially enlarged vertical sectional view of FIG. 6, which contains plasma of deuterium and tritium, for example. A toroidal magnetic field coil 102 that forms a toroidal magnetic field in the small circumferential direction (toroidal direction) of the small circular cross section is formed on the outer periphery of the vacuum vessel 101 that is a torus (annular) furnace. A poloidal magnetic field coil 103 that forms a poloidal magnetic field is wound in the circumferential direction (poloidal direction).

These toroidal and poloidal magnetic field coils 102 and 103 are for holding and confining the plasma 104 generated by the nuclear fusion reaction in the vacuum container 101 by electromagnetic force, and are composed of superconducting coils. The entire superconducting coil is airtightly covered with a cryostat 105 and kept at a cryogenic temperature in order to maintain superconductivity.

The vacuum container 101 has a shield 106 covering the entire inner peripheral surface directly exposed to the plasma 104. The inner peripheral surface of the shield 106 is referred to as a first wall 106a. Is on the floor 1 by the support 107
It is installed in 08. The vacuum container 101 is the shield 1
A diverter 109 for removing impurities in the plasma 104 is provided on a part of the inner wall of the diverter 1.
The impurities removed by 09 are discharged to the outside through a vacuum exhaust duct 110 connected to the bottom of the vacuum container 101.

The surfaces of the first wall 106a and the diverter 109 are easily damaged by a high heat load from the plasma 104 and neutral particles. Therefore, during the furnace shutdown, the first wall 106a
It is necessary to regularly observe and inspect the surface condition of the diverter 109 and the diverter 109. Therefore, as shown in FIG. 7, the in-reactor observation device 113 is installed from the outside of the cryostat 105 to the first wall 106a of the shield 106 of the vacuum container 101. An insertion port 111 for inserting inward is formed.

The first wall 10 is observed and inspected in the furnace.
When an abnormality in 6a or the diverter 109 is detected early, it is necessary to maintain the safety of the furnace by repairing and replacing it if necessary.

Since fusion neutrons are generated in the vacuum vessel 101 due to a fusion reaction during the operation of the reactor, a movable shield plug 112 is inserted into the insertion port 111 to shield the neutrons from being emitted to the outside. ing.

[0008]

[Problems to be Solved by the Invention] It is important to stop the furnace and observe and inspect the inside of the furnace promptly in order not to reduce the operating rate of the furnace.

For that purpose, it is necessary to quickly pull out and insert the movable shield plug 112 from the insertion port 111. In the conventional extraction of the movable shield plug 112, it is considered that the movable shield plug 112 is lifted up through the insertion port 111 by, for example, an overhead crane and pulled out to the outside.

After pulling out the movable shield plug 112, as shown in FIG. 8, an in-reactor observing device including an optical system, a camera, an optical fiber, etc., which combines an optical lens and a reflecting mirror of the same principle as the periscope of a submarine. 113 is inserted into the insertion port 111.

However, as described above, it is important to quickly pull out and reinsert the movable shield plug 112 as one method for preventing the operating rate of the furnace from being lowered.

Therefore, the present invention has been made in view of the above circumstances, and its purpose is to perform nuclear fusion in which a movable shield plug can be quickly pulled out from and inserted into an insertion port to increase the operating rate of the reactor. To provide a furnace.

[0013]

The present invention is directed to an insertion port 1
A drive device for driving the movable shield plug 112 that opens and closes 11 is provided, and is configured as follows.

That is, according to the present invention, there is provided an insertion port which communicates with the inside and outside of a vacuum container for containing plasma and into which an in-furnace observation device for observing the inside of the vacuum container is inserted, and a movable shield plug which opens and closes the insertion port. In the nuclear fusion reactor, the driving device for driving the movable shield plug to open and close the insertion port is provided.

[0015]

The insertion port is opened and closed by the drive device that drives the movable shield plug.

Therefore, according to the present invention, since the movable shield plug is opened / closed by the drive device, the opening / closing operation of the insertion port can be performed quickly. Therefore, the operating rate of the furnace can be increased.

[0017]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5, the same parts as those in FIGS. 6 to 8 are designated by the same reference numerals to simplify or omit the description of the overlapping parts.

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of the present invention, showing an enlarged view of part A in FIG. 7 and its periphery. In FIG. 1, the movable shield plug 1 has a cross-sectional shape that is a wedge shape that is tapered toward the inside of the vacuum container 101, and is inserted into the wedge-shaped opening 106b of the shield 106 in an airtight manner so that it can be inserted and removed freely. Moreover, it is shaped so as not to fall into the vacuum container 101.

The upper end of the movable shield plug 1 in the figure is movably connected to the hydraulic cylinder drive unit 3 via a shaft 2, and the movable shield plug 1 is driven by the hydraulic cylinder drive unit 3 to move the movable shield plug 1 into the central axis of the insertion port 111. On the other hand, the insertion port 111 is opened and closed by reciprocating in the Z direction inclined by a required angle.

The hydraulic cylinder drive device 3 has an insertion port 11
1 of the insertion port tube 111a forming the inner end of the accommodation chamber 4
It is housed inside and is firmly fixed to the outer peripheral surface of the shield 106 substantially in parallel to the Z direction.

The accommodating chamber 4 is formed by bulging one side surface of the inner end portion of the insertion tube 111a outward, and the hydraulic cylinder driving device 3
Is tilted and fixed at a position away from the straight insertion path of the insertion port 111. Both ends of the insertion port pipe 111a are airtightly fixed to the outer surface of the peripheral portion of the opening end of the vacuum container 101 of the insertion port 111.

Therefore, the movable shield plug 1 can be pulled out by the driving force of the hydraulic cylinder drive device 3 to an open position which does not interfere with the insertion path of the in-furnace observation device 113 in the insertion port 111, and the furnace is opened when the insertion port 111 is opened. The inside observation device 113 can be inserted into the inside of the first wall 106a in the vacuum container 101 through the insertion port 111.

The hydraulic cylinder drive device 3 is connected to a pressure water supply source (not shown) via a water supply pipe 5. Although not shown, a coolant that suppresses the temperature rise of the movable shield plug 1 due to nuclear heat generation is supplied through a flexible pipe connected to the shield 106, like the water supply pipe 5. During operation of the furnace, the upper end of the opening of the insertion port 111 is vacuum-sealed by the closing flange 6 for the vacuum container 101.

Next, the operation of this embodiment will be described.

After the furnace is stopped, the in-furnace observation device 113 is passed through the insertion port 111, and the first wall 106a in the vacuum vessel 101 is closed.
When inserting inward, as shown in FIG. 2, first, the hydraulic cylinder drive device 3 is operated to pull the movable shield plug 1 upward in the Z direction to the open position.

Then, the wedge-shaped opening 10 of the shield 106 is formed.
6b opens. Therefore, the closing flange 6 is removed from the outer end of the insertion port pipe 111a. Then, as shown in FIG. 3, the in-furnace observing device 113 is inserted from the insertion port 111 to inspect and observe the in-furnace.

Therefore, according to this embodiment, since the movable shield plug 1 is reciprocated between the open position and the closed position by the hydraulic cylinder drive device 3, the insertion port 111 is opened and closed, so that the opening and closing can be performed quickly. Can be done.
Therefore, the operating rate of the furnace can be increased.

FIG. 4 and FIG. 5 show a longitudinal cross section of the main part of another embodiment of the present invention, which opens and closes the inner end of the insertion port 111 from the direction perpendicular to its axis (Y direction in the drawings). A plurality of sets of a movable shield plug 11 and a hydraulic cylinder drive device 13 connected to the movable shield plug 11 via a shaft 12 so as to be interlocked with each other are embedded in the shield body 106.

In this embodiment, a plurality of movable shield plugs 1
1, 1 ... Can be opened and closed independently and multiple times, so that safety can be improved.

[0030]

As described above, according to the present invention, the movable shield plug that opens and closes the insertion port into which the in-core observation device is inserted is opened and closed by the drive device, so that the insertion port can be opened and closed quickly. . Therefore, the operating rate of the furnace can be increased.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of a fusion reactor according to the present invention.

FIG. 2 is a longitudinal sectional view of an essential part showing an opened state of an insertion port of the embodiment shown in FIG.

FIG. 3 is a longitudinal sectional view of a main part showing a state in which a furnace observation device is inserted into the furnace in the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a longitudinal sectional view of a main part of another embodiment of the present invention.

5 is a longitudinal cross-sectional view of essential parts showing an opened state of the insertion port of the embodiment shown in FIG.

FIG. 6 is a partial vertical cross-sectional view of a conventional fusion reactor.

FIG. 7 is a partial vertical sectional view of a conventional fusion reactor.

FIG. 8 is a partial vertical cross-sectional view showing a state in which the in-furnace observation device is inserted into the conventional furnace shown in FIGS. 6 and 7.

[Explanation of symbols]

 1, 11 Movable shield plug 2, 12 Axis 3, 13 Horizontal cylinder drive device 101 Vacuum container 102 Toroidal magnetic field coil 103 Poloidal magnetic field coil 104 Plasma 106 Shield

Front Page Continuation (72) Inventor Kiyoshi Shiwanuma 1 801 Mukaiyama, Naka-cho, Naka-gun, Naka-gun, Ibaraki Prefecture Japan Atomic Energy Research Institute Naka Research Institute

Claims (1)

Claim: What is claimed is: 1. An insertion port, which communicates with the inside and outside of a vacuum container for containing plasma and into which a furnace observation device for observing the inside of the vacuum container is inserted, and a movable shield for opening and closing the insertion port. A fusion reactor having a plug, comprising a drive device for driving the movable shield plug so as to open and close the insertion port.