JP3119941B2 - Furnace inspection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast breeder reactor by scanning an ultrasonic transducer in opaque sodium in liquid metal sodium (hereinafter referred to as sodium) in a reactor vessel. The present invention relates to an in-furnace inspection apparatus for visually inspecting structures.

[0002]

2. Description of the Related Art A conventional inspection apparatus in a fast breeder reactor will be described with reference to FIG. Reference numeral 1 partially shows a shielding plug, which is for closing an upper opening of a fast breeder reactor vessel (not shown). This reactor vessel contains sodium 2 as a coolant. In the reactor vessel, furnace internal structures such as a core upper mechanism, a circulating pump, and a core support mechanism, and furnace equipment are arranged, but are omitted.

A long support tube 3 is provided upright on the shielding plug 1, and a drive unit in which a furnace outer tube portion 5 and a furnace inner tube portion 6 are connected to the long support tube 3 via a swivel bearing 4. The device body 7 is provided so as to be supported.

[0004] A tilt adjusting shaft 8 is provided in the furnace outer tube portion 5 and the furnace inner tube portion 6 along an axis. A ball screw 9 for tilt adjustment is connected to the upper part of the shaft 8 for tilt adjustment, and a gear 10 for tilt adjustment is provided above the ball screw 9.
A tilt position detector 11 is attached to the tip of the ball screw 9.

The inclination adjusting gear 10 is meshed with a small diameter gear 12, and the small diameter gear 12 is mounted on a rotating shaft 14 of an inclination adjusting motor 13. A scanning ball screw 15 is provided in the furnace outer cylinder 5 in addition to the inclination adjusting shaft 9.

[0006] A scanning gear 16 is mounted on the upper portion of the scanning ball screw 15, and a scanning position detector 17 is mounted on the tip of the scanning ball screw 15 that passes through the scanning gear 16. . The scanning gear 16 is meshed with a small-diameter gear 18, and the small-diameter gear 18 is
9 is attached to the rotating shaft 20. A scanning shaft 21 is connected to a lower portion of the tilt adjusting ball screw 15.

The lateral sides of the scanning shaft 21 and the tilt adjusting shaft 8 are prevented from rolling by the first support plate 22. The side surfaces of the tilt adjusting ball screw 9 and the scanning ball screw 15 are prevented from rolling by the second support plate 23. A large-diameter gear 61 is attached to the outer peripheral surface of the furnace outer tube portion 5, and the large-diameter gear 61 is engaged with the turning gear 24 provided in the turning cylinder 62 .

The turning gear 24 is mounted on a turning shaft 25, and the turning shaft 25 is turned by a turning motor 28 installed on the shielding plug 1 via angled gears 26 and 27. It is provided in the use cylinder 62 . The turning shaft 25 is supported by a bearing 29, and a turning position detector 30 is connected to a tip portion.

On the other hand, a joint 31 is connected to the lower end of the tilt adjusting shaft 8 in the furnace inner tube 6, and one end of a tilt adjusting arm 32 is attached to the joint 31. The other end of the tilt adjustment arm 32 is rotatably connected to a link 34 attached to the arm 33. Arm part 3
Ultrasonic transducer 35 is movable to the other end of 3
It is attached to.

A wire 36 is connected to the ultrasonic transducer 35.
Of the wire 36 is connected to the pulleys 37, 38.
Is connected to the scanning shaft 21 via the. The arm 33 is rotatably attached to a support shaft 39 on the other end side.
Are attached to a fixed base (not shown). The fixing base is installed in the furnace inner tube part 6.

The above-mentioned conventional in-core inspection apparatus inspects, for example, the state of the fuel assembly in the reactor core in the furnace vessel with the ultrasonic transducer 35. An example of the inspection method will be described.

The ultrasonic transducer 35 is moved by the scanning motor 19 to the scanning gear 16 and the scanning ball screw 1.
5, the wire 36 is moved along the pulleys 38 and 37 so as to move the arm 36 in the front-rear direction (in FIG.
The ultrasonic transducer 35 emits an ultrasonic wave each time the output of the scanning position detector 17 for detecting the position before and after the ultrasonic transducer 35 changes by a fixed value. Receive.

[0013] In addition, the mountain by the driving of the turning motor 28
The turning gear 24 attached to the turning shaft 25 rotates through the mold gears 26 and 27, and the large diameter meshes with the turning gear 24.
The gear 61 rotates. With the rotation of the large diameter gear 61, the entire drive body 7 on the swivel bearing 4 is pivoted. I to <br/> Ri ultrasonic transducer 35 is Ru is scanned turning. During scanning, the ultrasonic transducer 35 is provided with a turning position detector 30 for detecting the turning position of the ultrasonic transducer 35.
The ultrasonic wave is transmitted and received every time when the output changes by a certain value.

The ultrasonic transducer 35 is scanned on the same plane by combining the above-described front-rear scanning and swivel scanning, and an image of the inspection object in the reactor vessel can be obtained.

In order to tilt the arm portion 33 so that the ultrasonic transducer 35 faces the object to be inspected, the tilt adjusting motor 13 is driven, and the tilt adjusting gear 10, the tilt adjusting ball screw 9 and the tilt adjuster are driven. The arm portion 33 is moved by moving the tilt adjusting arm 32 via the shaft 8.
Can be adjusted. The detection of the tilt position of the ultrasonic transducer 35 is performed by the tilt position detector 11.
Done by

[0016]

In the conventional furnace inspection apparatus, the tilt adjusting motor 13 and the turning motor 28 are installed outside the furnace above the shielding plug 1 to drive the ultrasonic transducer 35 for tilting and turning. ing. Therefore, in order to drive the ultrasonic transducer 35, a large-sized drive transmission such as the long tilt adjusting shaft 8, the tilt adjusting ball screw 9, the tilt adjusting arm 32, the scanning ball screw 15, and the scanning shaft 21 is performed. Requires a mechanism.

For this reason, the size of the drive unit is increased, the drive area is limited, the inspection area is limited, and the display accuracy of the ultrasonic image for visualization by the mechanical rattling of the drive transmission mechanism is improved. There are issues such as difficulty in improving.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a drive transmission mechanism for driving an ultrasonic transducer is miniaturized, and a position detector is installed in the reactor vessel, thereby enabling the ultrasonic transducer to be installed in the reactor vessel. It is an object of the present invention to provide an in-furnace inspection apparatus capable of improving moving performance and driving accuracy, improving electrical, mechanical and radiation resistance, and improving image accuracy by ultrasonic waves.

[0019]

The invention according to claim 1 is for fixing.
A drive mechanism body in which the body and the turning body are connected, and position detection
The container is built-in and mounted inside the fixing barrel,
Built-in swivel motor for swiveling the body cylinder and position detector
And a scanning motor mounted in the turning barrel.
The motor for tilt and tilt adjustment, and the motor for tilt adjustment
An arm portion having a base side mounted in the turning trunk;
An ultrasonic transformer movably attached to this arm
One end of the ultrasonic transducer is connected to the transducer.
The other end is connected to the scanning shaft of the scanning motor.
And a wire .

[0020] The invention according to claim 2 wherein the rotation motor, wherein
Traction motor and the rotor of the tilt adjustment motor is a high permanent magnet having a Curie temperature of such sub <br/> Mariumu cobalt
It becomes, and the swing motor, scanning motor and the adjustment motor and the wire winding of the position detector refractory
It is characterized by being coated with an inorganic heat-resistant insulating material made of a compound .

According to the first aspect of the present invention, the fixing cylinder and the swirling cylinder are shorter than the conventional furnace outer cylinder part and furnace inner cylinder part, and the apparatus can be downsized. The motor and position detector case can be cooled by sodium in the reactor either directly or indirectly by mounting via the outer wall of the drive body separating the motor and position detector from sodium in the reactor vessel. Therefore, it is possible to suppress a rise in temperature in the motor.

Further, since the motor can directly drive the ultrasonic transducer without passing through the long axis drive transmission section, it is possible to improve the scanning accuracy, to reduce the size of the drive device, and to improve the movement performance. it is Ru can.

According to the invention of claim 2, the rotation motor that drives the ultrasound transducer, scanning motor, the rotor of the tilt adjustment motor is constituted by a high permanent magnet having a Curie temperature of samarium cobalt, each Since the core wires of the motor and position detector windings are coated with an inorganic heat-resistant insulating material made of a high melting point compound, the electrical, mechanical and radiation resistance of the windings are improved, It is possible to prevent a decrease in insulation performance in sodium.

That is, the inorganic heat-resistant insulating material is an environmental condition in sodium in a reactor vessel for a fast breeder reactor, which is an environmental condition.
It can be used continuously even at 0 ± 20 ° C. and about 10 million rads of radiation, and has radiation resistance.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an in-furnace inspection apparatus according to the present invention will be described with reference to FIGS. In the figure, the same parts as those in FIG. In the figure, reference numeral 1 denotes a shielding plug which closes an upper end opening of a reactor vessel (not shown). Sodium 2 is contained in the reactor vessel.

In FIG. 1, reference numeral 40 denotes a drive mechanism main body. The drive mechanism main body 40 is mostly immersed in sodium 2 and the upper and lower support cylinders 4 projecting above the shield plug 1 are provided.
It is held at 1. The drive mechanism main body 40 has a short fixing cylinder 42 whose upper part is fixed to a short support cylinder 41 and is suspended in a reactor vessel, and a short turning cylinder 43 rotatably connected to the fixing cylinder 42. It consists of

A partition plate 44 is provided between the fixing drum 42 and the turning drum 43, and a turning bearing 45 is provided around the outer periphery of the partition plate 44, so that the turning drum 43 is rotatable. I have. The turning motor 46 is mounted on the partition plate 44 by the rotating shaft 4.
7 and is attached using the wall surface of the fixing body 42. Note that a bearing (not shown) is provided on the partition plate 44, and the rotating shaft 47 is supported by the bearing.

A turning gear 48 is attached to the rotating shaft 47. The turning gear 48 is engaged with an annular gear 49 fixed to the inner surface of the turning drum 43, and is driven by a turning motor 46 to turn. The body 43 rotates. A scanning motor 50 is provided in the turning drum 43.
In addition, a tilt adjusting motor 51 is installed using the body wall surface.

A first pulley 52 is attached to the scanning motor 50. One end of a wire 36 is connected to the first pulley 52, and the other end of the wire 36 is connected to an ultrasonic wave through a second pulley 53. Connected to transducer 35. The tilt adjusting motor 51 is connected to a base 33 a at one end of the arm 33 via a tilt adjusting gear 54.

The turning motor 46, the scanning motor 50, and the tilt adjusting motor 51 are used at a high temperature of sodium 2 and are configured as shown in FIG. That is, a rotor 57 attached to a rotating shaft 56 and an annular armature winding 58 facing the rotor 57 are provided in the motor casing 55, and a position detector 59 is attached to the rotating shaft 56. Have been.

Cooling fins 60 are mounted on the outer surface of the motor casing 55. The rotor 57 is formed of a permanent magnet having a high Curie temperature such as samarium cobalt. The core wire of the armature winding 58 is coated with at least one inorganic heat-resistant insulating material selected from a silicon-based inorganic polymer such as polyborosiloxy acid, for example, a glass fiber such as heat-resistant glass, or a high-melting compound fiber such as alumina. .

The core of the winding of the position detector 59 is made of at least one inorganic heat-resistant insulating material selected from a silicon-based inorganic polymer such as polyborosiloxy acid, for example, a glass fiber such as heat-resistant glass, or a high melting point compound fiber such as alumina. Is coated. The cooling fins 60 supply electricity to the armature winding 58 from an AC power supply to drive the rotating shaft 56.

Since heat is generated at that time, the heat is dissipated into the sodium 2 via the motor casing 55 and the cooling fins 60 to cool the rotor 57 and the armature winding 58. In this way, a small high-temperature drive motor having excellent cooling efficiency is used for the turning motor 46, the scanning motor 50, and the tilt adjusting motor 51.

As described above, the armature winding 58 and the position
By covering the core wire of the winding of the detector 59 with an inorganic heat-resistant insulating material, the electrical and mechanical properties in high-temperature sodium are good, the continuous use at about 300 ° C. is possible, and the radiation-resistant property is obtained. Having. In the conventional example, an organic insulating material such as polyimide is used for coating the winding, but there is a disadvantage that the winding is deteriorated under high temperature and high radiation.

Next, an example of the operation of the in-furnace inspection apparatus having the above configuration will be described. In FIG. 1 , a supersonic transducer 35 is installed in sodium 2 in a reactor vessel, and a first pulley 52 and a second pulley 53 are directly driven by a scanning motor 50 installed inside a driving device main body 40. Through wire 3
The ultrasonic transducer 35 transmits and receives an ultrasonic wave during scanning by moving the moving member 6 in the front-rear direction.

Further, the ultrasonic transducer is turned by directly turning the turning drum 43 supported by the turning bearing 45 via the turning gears 48 and 49 by the turning motor 46 installed inside the fixing drum 42. The ultrasonic transducer 35 transmits and receives an ultrasonic wave at the time of the swivel scanning.

The ultrasonic transducer 35 is scanned on the same plane by combining the above-described front-back scanning and swivel scanning, and an image of the inspection object can be obtained. In addition to the above, a tilt adjusting motor 51 is provided to directly face the ultrasonic transducer 35 to the inspection object, and the tilt can be directly adjusted by the tilt adjusting gear 54.

The turning motor 46, the tilt adjusting motor 51, and the scanning motor 50 have built-in detectors for detecting the angles of the rotors of the motors 2 to 4, which are simplified as described above. By combining with a driving structure, a small and highly accurate in-core inspection apparatus with high mobility can be provided.

[0039]

According to the present invention, an ultrasonic transducer is provided.
The position detection of the driven part in the furnace such as
Because it can be detected, it has high mobility in the furnace
It is possible to provide a furnace inspection device capable of detecting accuracy
You .

[Brief description of the drawings]

Longitudinal sectional view partially showing schematically an embodiment of a furnace inspection apparatus according to the present invention; FIG.

FIG. 2 is a front view showing the motor in FIG. 1 in a partial sectional view.

FIG. 3 is a vertical cross-sectional view showing a partial side view of a conventional in-furnace inspection apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield plug, 2 ... Liquid metal sodium, 3 ... Long support cylinder, 4 ... Slewing bearing, 5 ... Furnace outer cylinder part, 6 ... Furnace inner cylinder part, 7 ... Drive device main body, 8 ... Tilt adjusting shaft Reference numeral 9: Ball screw for tilt adjustment, 10: Gear for tilt adjustment, 11: Position detector for tilt, 12: Small diameter gear, 13: Motor for tilt adjustment, 14: Rotating shaft, 15: Ball screw for scanning, 16 ... Scanning gear, 17: scanning position detector, 18: small diameter gear,
19: scanning motor, 20: rotating shaft, 21: scanning shaft,
Reference numeral 22: first support plate , 23: second support plate , 24: turning gear, 25: turning shaft, 26, 27 ... chevron gear, 28
... turning motor, 29 ... bearing, 30 ... turning position detector, 31 ... joint, 32 ... tilt adjusting arm, 33 ... arm part, 34 ... link, 35 ... ultrasonic transducer,
36 ... wire, 37, 38 ... pulley, 39 ... spindle, 40 ...
Drive mechanism main body, 41: short and small support cylinder, 42: fixing cylinder, 4
3 ... turning body, 44 ... partition plate, 45 ... turning bearing, 4
6 ... turning motor, 47 ... rotating shaft, 48 ... turning gear,
49: turning annular gear, 50: scanning motor, 51: tilt adjusting motor, 52: first pulley, 53: second pulley, 54: tilt adjusting gear, 55: motor casing,
56 ... rotating shaft, 57 ... rotor, 58 ... armature winding, 59
... Position detector, 60 ... Cooling fin , 61 ... Large-diameter gear,
62: turning cylinder .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 17/08 GDF G01N 29/10 507 G01N 29/26 501

Claims (2)

(57) [Claims] 1. A drive in which a fixing cylinder and a turning cylinder are connected.
A mechanism body and a position detector are built in and housed in the fixing barrel.
A turning motor attached to drive the turning cylinder to turn.
And a position detector built in and mounted inside the turning trunk.
Scanning motor and tilt adjustment motor, and the tilt
Driven by an adjustment motor, the base of which is mounted inside the turning barrel
Arm part and movably attached to this arm part
And the ultrasonic transducer
One end is connected to the juicer and the other end is the scanning motor.
And a wire connected to the scanning shaft . 2. The turning motor, the traveling motor and
Preliminary rotor of the tilt adjustment motor is made high permanent magnet having a Curie temperature of samarium cobalt, and the swing motor, scanning motor and the adjustment motor and core refractory compound of winding of the position detector It is coated with <br/> inorganic heat-resistant insulating material consisting of furnace inspection apparatus according to claim 1, wherein.