JP3349348B2 - Reactor internal structure shape measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for remotely measuring the shape and size of a mechanical structure, and more particularly to the length of an internal structure such as a core baffle plate of a pressurized water reactor.
The present invention relates to a shape measuring device suitable for measuring undulation and width of a surface.

[0002]

2. Description of the Related Art A fuel assembly loaded in a nuclear reactor vessel is generally a vertically long structure having a rectangular cross section. The outer peripheral flat cross section of a core formed by arranging a plurality of these adjacently has a step-like shape. These are surrounded by a furnace internal structure including a plate-like member called a core baffle plate. Referring to FIGS. 3 and 4, an example of a pressurized water reactor will be described. A lower core plate 2 and a lower core support plate 3 are provided below a core tank 1 suspended in a reactor vessel (not shown). Are provided extending in the lateral direction. A plurality of fuel assemblies 4 are loaded on the lower core plate 2 to form a core, and a core baffle plate 5 surrounding and surrounding the outer peripheral surface of the fuel assembly 4 is placed on the inner surface of the core tank 1 through a horizontal mounting plate 6. Fixed. FIG. 4 shows only the assembly of the core baffle plate 5 and the mounting plate 6, but as can be seen, the core baffle plate 5 is constituted by combining a plurality of flat plates as shown in FIG. It has a structure surrounding the circumference.

[0003]

However, since the core baffle plate as described above is close to the fuel assembly of the core, which is a heat generating source, the core baffle plate is affected by heat and further receives radiation emitted from the core. For this reason, the core baffle plate is easily deformed. However, if the core baffle plate is deformed too much, the dimension between the core baffle plate and the core is changed, which may cause various problems. Therefore, it is required to accurately measure the change in the shape and size of the core baffle plate. However, the reactor internals including such a core baffle plate are radioactive after reactor operation has started, and cannot be inspected directly by an inspector. As described above, a device for remotely measuring the shape and dimensions of a core structure such as a core baffle plate has been conventionally demanded. However, the present invention has been developed to measure the shape of a reactor internal structure corresponding to such needs. It is an object to provide a device.

[0004]

According to the present invention, there is provided a vertically elongated main body frame, comprising:
A hanging member provided on an upper portion of the frame, and the main body frame
Clamping contact member protruding from the lower end of the
When the length provided in the main body frame measuring device consists undulation measurement apparatus and the width detector, the length measuring device, provided telescopically in the longitudinal direction of the body frame at an upper portion of the body frame A clamp cylinder , a first magnescale interlocked with the clamp cylinder,
Baffle plate contact confirmation sensor provided on the contact member
Has the door, the undulation measurement device, said a carriage that moves longitudinally along the body frame, provided on the front of the carriage, and a second magnetic scale which is pressed against the baffle plate, is fixed to the carriage and a movement amount detector that moves in conjunction Te, the width detector, the present
Along both sides of the body frame have a ultrasonic sensor pairs disposed in a vertical direction, the length measuring device, the back
The backing member is backed up by the contact sensor for full plate contact confirmation.
Make sure that the book is in contact with the bottom
The first magneskage which is in contact with the upper end surface of the body frame;
The baffle plate vertically
The undulation measuring device measures the surface of the baffle plate.
The swell is measured by the movement amount detector, and the width detector
The plural pairs of ultrasonic sensors transmit ultrasonic waves and reflect
The distance is detected by detecting a sound wave .

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, a vertically long main body frame 20 has a substantially U-shaped flat cross section, and a hanger 23 is erected on a top plate 21 thereof. This hanging tool 23 is used when it is hung by a crane or the like to perform measurement. At the lower end of the body frame 20, a contact member 25 for clamping is provided so as to protrude, a sensor 27 for confirming contact with a baffle plate is provided on the upper surface thereof, and two clamp cylinders 29 are further provided on the upper portion. The clamp cylinder 29 and the abutment member 25 are used for fixing the main body frame 20 to the core baffle plate 5 indicated by a two-dot chain line at the time of measurement, and also have a function of a length measurement both ends restrictor. A magnescale 31 serving as a measuring device is provided so as to be linked with the clamp cylinder 29, and forms a length measuring device in cooperation with the above-described clamp mechanism and the sensor 27. That is, it is confirmed by the output of the sensor 27 that the contact member 25 is in contact with the lower end surface of the core baffle plate 5, and the reading of the magnescale 31 interlocked with the clamp cylinder 29 abutting on the upper end surface of the main body frame 20 is remotely controlled. As a result, the vertical length of the core baffle plate 5 is measured. At the upper and lower portions of the front surface of the main body frame 20, abutment plates 33 are provided, which are in contact with the core side surfaces of the core baffle plate 5 at the time of the above-described mounting, and
Ensure the correct measurement posture of.

[0006] A lifting motor 41 is mounted on the lower surface of the top plate 21, and a carriage or moving carriage 45 is mounted on a lifting chain 43 wound around a sprocket of the output shaft. The inner surface on the opposite side of the body frame 20 has 2
Strip guide rails 35 are provided extending in the vertical direction, and guides at both ends of the movable carriage 45 are slidably fitted. That is, when the lifting chain 43 is moved up and down by being driven by the lifting motor 41, the movable carriage 45 is guided by the guide rail 35 and moves up and down in a correct posture. Mobile trolley 4
The movement amount detector 47 fixed to the rear side of the rack 5 meshes with the rack 37 provided on the main body frame 20, and detects the movement amount of the moving carriage 45 from the number of rotations. Moving cart 45
Is connected to the front side through three spring return type cylinders 49.
Magnescales 51 are provided, and the magnescales 51 are pressed against the core side surface of the core baffle plate 5 during measurement. Therefore, when the moving carriage 45 is moved in the vertical direction by the lifting motor 41 as described above, the magnescale 51 moves following the surface of the core baffle plate 5 and, if there are irregularities constituting the undulation, the height thereof moves. The measurement is performed by the amount detector 47 corresponding to the vertical position. That is, the undulation in the longitudinal direction is measured, and the above-described members cooperate to constitute the undulation measuring device 40.

Further, ultrasonic sensors 61 (only one is shown) are arranged at six places on the side surface of the main body frame 20 to constitute a width detector 60. This ultrasonic sensor 61
As shown in FIG. 2, it is composed of two distance sensors 63 and 65, which are connected to a distance measuring device (not shown) via cables 67 and 69. These distance sensors 63,
65 transmits an ultrasonic wave as shown by a broken line, detects a reflected ultrasonic wave, detects a distance, and if there is a difference between the two measured distances,
It is determined that there is a side end of the core baffle plate, and the change in width is measured. In order to measure the temperature at the time when the above-described series of measurement operations is performed, the thermometer 71 is attached to the main frame 2
It is attached to the right and upper right places.

[0008]

As described above, according to the present invention,
Since a vertically operable length measuring device, waviness measuring device, and width detector were installed on a vertically elongated frame clamped to the member to be measured , the battery as an activated reactor internal structure was installed.
The shape and dimensions of the full plate can be measured safely and reliably.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the entire structure of an embodiment of the present invention.

FIG. 2 is a partial plan view showing a part of the embodiment in an enlarged manner.

FIG. 3 is a partially cutaway perspective view showing an example of a reactor internal structure which is an example of an object to be measured by the shape measuring apparatus of the present invention.

FIG. 4 is a perspective view extracting and showing a part of FIG. 3;

[Explanation of symbols]

 Reference Signs List 5 core baffle plate 20 main body frame 21 top plate 23 hanging tool 25 abutment member 27 sensor 29 clamp cylinder 31 magnescale 33 abutment plate 35 guide rail 37 rack 40 swell measurement device 41 elevating motor 43 elevating chain 45 moving trolley 47 moving amount detector 49 Spring-return type cylinder 51 Magnescale 60 Width detector 61 Ultrasonic sensor 63, 65 Distance sensor 67, 69 Cable 71 Thermometer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 5/20 G01B 5/02 101 G01B 5/28 102

Claims (1)

(57) [Claims] A vertically elongated main body frame; and a main body frame.
And a lower end of the main body frame.
And contact member for clamping which protrudes into parts, the length provided in the main body frame measuring device consists undulation measurement apparatus and the width detector, the length measuring device, the upper portion of the body frame Book
A clamping cylinder provided telescopically in the longitudinal direction of the body frame, a first magnescale interlocked with the clamp cylinder, a baffle plate provided in said contact member
And a contact confirmation sensor, the undulation measurement device includes a carriage that moves longitudinally along the body frame, provided on the front of the carriage, and a second magnetic scale is pressed against the baffle plate, wherein and a movement amount detector that moves in conjunction fixed to the carriage, the width detector, have a ultrasonic sensor pairs arranged vertically along the sides of the body frame, The length measuring device includes a contact cell for confirming contact with the baffle plate.
The contact member contacts the lower end surface of the baffle plate
Check that the
Remotely obtain the reading of the first magnescale in contact
Then, the vertical direction length of the baffle plate is measured, and the undulation measuring device measures the undulation of the surface of the baffle plate.
The distance is measured by a moving amount detector, and the width detector detects the ultrasonic waves by the plurality of pairs of ultrasonic sensors.
An apparatus for measuring the shape of an internal structure of a nuclear reactor, wherein the distance is detected by transmitting and detecting reflected ultrasonic waves .