JPH0894531A - Control rod drive mechanism flange inspection device - Google Patents

Abstract

(57) [Summary] [Purpose] The inspection position of the control rod drive mechanism flange can be easily accessed, and leak inspection at the time of water pressure test and periodic inspection can be performed efficiently and reliably, and the integrity of the flange Improve the operability and reliability of confirmation. [Structure] Inspection device main body 2 for rod-shaped manual operation
1 and an observation unit 23 for inputting an inspection signal from the inspection apparatus main body to display. Inspection device body 21
Is a gripping operation grip 27, an elongated tubular body 24 connected above the grip, and an insertion confirmation mirror 30 provided at a lower end portion of the tubular body and having an obliquely upward reflecting surface.
A support leg 31 which is provided on the upper side of the tubular body and which can be opened and closed laterally; a tip member 37 which is provided so as to be capable of expanding and contracting upward from the upper end portion of the tubular body; And a lighting device provided on the tip member in close proximity to the camera device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rod drive mechanism flange portion used for confirming and inspecting the control rod drive mechanism flange portion of an improved boiling water reactor (ABWR) by visual inspection and water pressure test. Regarding inspection equipment.

[0002]

2. Description of the Related Art A boiling water reactor (BW) as a light water reactor
In R), the control rod drive mechanism is attached to the control rod drive mechanism housing below the reactor pressure vessel. Generally, in this control rod drive mechanism, the scram operation is of a hydraulic drive type, but the normal operation (shim operation) includes a hydraulic drive type and a motor drive type, and the latter motor drive type is particularly improved. It is used in the boiling water reactor (ABWR).

FIG. 4 shows the construction of a control rod drive mechanism in which both the scrum operation and the shim operation are hydraulically driven. As shown in the figure, a plurality of control rod drive mechanisms 2, for example, 205 control rod drive mechanisms 2 are vertically installed in the lower part (lower mirror) of the reactor pressure vessel 1.

Each control rod drive mechanism 2 comprises a reactor pressure vessel 1.
The control rod drive mechanism housing 3 is welded to the bottom wall of the cylinder, and the cylinder, drive piston, index tube, collet piston, latch, etc. are provided in the control rod drive mechanism housing 3. A flange portion 4 that constitutes a drive water inlet or the like is provided at the lower end portion of the control rod drive mechanism housing 3.

Such a hydraulically driven control rod drive mechanism 2
Then, the flange portion 4 can be relatively easily observed from the platform 5 below the reactor pressure vessel 1. Therefore, the soundness inspection of the metal O-ring for sealing the reactor water in the flange portion 4, that is, the inspection for preventing the reactor water leak can be performed relatively easily by observing the appearance.

On the other hand, FIG. 5 shows the structure of an improved control rod drive mechanism 11 in which the shim operation is a motor drive type. As shown in the figure, in the control rod drive mechanism 11, a shaft seal housing 14 for sealingly enclosing a rotary shaft in a sealed state and a motor are further provided under a flange portion 13 provided at a lower end portion of the control rod drive mechanism housing 12. A motor bracket 15 for supporting the motor, a motor housing 16 for accommodating the motor, and the like hang down.

Therefore, in the control rod drive mechanism 11 having the structure shown in FIG. 5, the view from below the flange portion 13 is blocked by the shaft-sealing housing 14, the motor bracket 15, the motor housing, etc. There was a problem that the leakage inspection at the time of testing and periodic inspection became difficult by direct visual inspection. Control rod drive mechanism 1
1 are adjacent to each other, and the narrow housing gap makes the inspection more difficult.

[0008]

SUMMARY OF THE INVENTION In an improved motor-driven control rod drive mechanism, the control rod drive mechanism further hangs below the flange of the control rod drive mechanism, and the gap between them is narrow. It was difficult to inspect the drive mechanism flange for leaks.

The present invention has been made in consideration of the above-mentioned circumstances, and it is easy to access the inspection position of the control rod drive mechanism flange portion, and to efficiently perform the leakage inspection during the water pressure test and the periodic inspection. It is an object of the present invention to provide a control rod drive mechanism flange portion inspection device that can be surely performed and can improve the operability and reliability of confirming the soundness of the flange portion.

[0010]

In order to achieve the above-mentioned object, the present invention is directed to a lower part of a motor-driven control rod drive mechanism housing vertically installed at a lower portion of a reactor pressure vessel of a boiling water reactor. Of the control rod drive mechanism housing, which is inserted into the gap between the control rod drive mechanism housings and observes the leakage of the control rod drive mechanism flange portion in the housing connection part, and is a rod-shaped inspection device for manual operation as a whole. Body and
The inspection device main body includes an observation unit that inputs an inspection signal from the inspection device main body to perform display, and the inspection device main body includes a grip operation grip, a long cylindrical body connected above the grip, and the cylindrical body. An insertion confirmation mirror provided at a lower end portion of the cylindrical body having an obliquely upward reflecting surface, a support leg provided on an upper side of the tubular body and capable of opening and closing in a lateral direction, and extending and contracting upward from an upper end portion of the tubular body. A tip member that is provided so as to be possible, a camera device that is provided on the tip member to optically observe the side, and an illumination device that is provided near the camera device and that is provided on the tip member. And

In the present invention, preferably, the inspection apparatus main body includes a pair of parallel cylindrical bodies connected to each other at upper and lower ends, and a camera apparatus for observing and irradiating the tip members of the respective cylindrical bodies in different directions. A lighting device is provided.

Further, in the present invention, preferably, the insertion confirmation mirror of the inspection apparatus main body is configured such that the direction of the reflection surface can be adjusted by a mirror adjustment grip provided on the cylindrical body.

Further, in the present invention, it is desirable that one cylinder is provided with a gripping operation grip and a mirror adjusting grip, and the other cylinder is provided with a support leg operating grip.

[0014]

According to the inspection device for the control rod drive mechanism flange portion according to the present invention, the inspector first holds the grip with the inspection device main body in a contracted state and stands on the platform surface to establish the forest of the control rod drive mechanism. Lift the inspection device body to the inspection position inside. At this time, the lighting device is turned on and the insertion confirmation mirror is used to confirm the insertion position of the device main body. Then, when the predetermined height is reached, the support legs are opened to be supported on the motor bracket in a hooked state. This completes the attachment of the device body.

Next, the tip member is extended upward to a predetermined inspection position, adjusted while checking the position of the camera device by the CRT or the like of the observation unit, and set at the inspection position of the control rod drive mechanism flange. To do.

The brightness of the illuminating device is adjusted while checking with the observation unit to make the image easy to inspect. The image of the flange portion captured by the camera device is sent to the observation unit via a camera cable or the like, and the inspection portion of the control rod drive mechanism flange portion is observed by this observation unit.

By observing the inspection location of the flange portion of the control rod drive mechanism, it is confirmed whether or not there is an abnormality in the external appearance of the flange portion and whether or not there is a leak during a water pressure test, and a confirmation inspection is performed to make a pass / fail judgment.

When the inspection of the control rod drive mechanism flange portion at one location is completed as described above, the tip member is lowered to bring the entire length of the inspection apparatus body into a shortened state, and the support leg 17 is provided.
Closed, the device main body is removed, and the same operation as above is repeated at the next place.

Therefore, according to the present invention, the inspection apparatus main body can be easily accessed to the inspection position of the control rod drive mechanism flange portion to efficiently and surely perform the leakage inspection during the water pressure test and the periodic inspection.

When the inspection apparatus main body is provided with a pair of parallel cylindrical bodies, and the camera device and the illumination device are provided in the tip members of the respective cylindrical bodies in different directions, two portions are provided at one location. The control rod drive mechanism flange portion in the same direction can be observed at the same time, and the efficiency can be further improved.

Further, the insertion confirmation mirror can more reliably determine the insertion position of the apparatus main body if the direction of the reflection surface can be adjusted by rotating the insertion confirmation mirror, for example, on a horizontal plane with a grip provided on the cylindrical body. be able to.

Further, by providing a gripping grip, a mirror supporting grip, a supporting leg actuating grip, etc. at a predetermined portion of a pair of parallel cylinders, the operation can be performed more easily.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Since the control rod drive mechanism to be inspected is the same as that shown in FIG. 5, redundant description will be omitted, and corresponding parts will be described using the same reference numerals as those in FIG.

FIG. 1 schematically shows the overall structure of the inspection apparatus according to this embodiment. As shown in the figure, the inspection device 20 of the present embodiment is roughly classified into a bar-shaped inspection device main body 21 for manual operation, and the inspection device main body 2
1, an observation unit 23 for inputting an inspection signal via a flexible tube 22 and displaying an inspection result, and the inspection apparatus main body 21 is a motor-driven control installed vertically under the reactor pressure vessel 1. The rod drive mechanism 11 is inserted into the gap between the control rod drive mechanisms 11 from below.

2 and 3 are an enlarged front view and a side view of the inspection apparatus body 21.

The inspection device main body 21 has a pair of parallel cylindrical bodies 24 (24a, 24b) which are used in a vertically long shape. The upper and lower ends of the cylindrical bodies 24a, 24b are connected to each other by the connecting member 2.
5,26 are connected.

A cylindrical grip 27 for gripping operation is fitted and fixed to the lower end portion of one of the cylinders 24a, and an inspector can grip the grip 27 and move the inspection apparatus body 1 such as carrying it. It is like this. In addition, this cylindrical body 24a
Above the grip 27 of the, a cylindrical mirror adjustment grip 2
8 is rotatably fitted to the inspection device main body 21 via an inverted V-shaped bracket 29.
The insertion confirmation mirror 30 has a reflection surface 30a of, for example, 45
It is installed at an angle of 0 °. This allows
The insertion confirmation mirror 30 is, for example, a reflection surface 30 a
When viewed from the horizontal direction, the upper part is projected, and by rotating the grip 28, the mirror 30 is rotated around the axis of the cylindrical body 24a so that the field of view can be changed. Has become.

In addition, each of the cylindrical members 2 is attached to the upper connecting member 25.
A support leg 31 for locking the inspection device main body 21 is provided between 4a and 24b so as to be openable and closable, and this support leg 31 is for operating the support leg attached to the lower end of the other tubular body 24b. The grip 32 is adapted to open and close.

That is, the support legs 31 are a pair of vertically long plate-like members each having a free lower end, and are rotatably hung from both side edges of the upper connecting member 25 via hinge portions 33. ing.

The outer cylinder 34, which is rotatably fitted into the other cylinder 24b, has a length extending from the position near the lower end of the support leg 31 to the lower end of the other cylinder 24b. The outer cylinder 34 and the support leg actuating grip 32 are integrally rotatable. A horizontally long arm 35 is provided at the upper end of the outer cylinder 34.
Is integrally rotatably attached, and the opening / closing operation lever 36 connected to the tip of the arm 35 comes into contact with the back surface of the support leg 31, and when the arm 35 rotates, as shown by a phantom line in FIG.
The supporting leg 31 is pushed to perform an opening operation.

Further, a small diameter upper cylinder 37 (37a, 37b) as a tip member is slidably inserted in each cylinder 24a, 24b in the axial direction (vertical direction), and each upper cylinder 37a, 37b. Are projected and retracted from the upper end portions of the respective cylinders 24a and 24b so that the inspection device main body 21 expands and contracts upward as a whole.

On each of the upper cylinders 37a and 37b, there is provided a camera device 38 for optically observing the side, and the camera device 3
The illumination device 39 for irradiating the viewing direction according to FIG.

Each of the camera devices 38 is mainly composed of a CCD camera 38a, and has a viewing direction conversion prism 40 at the tip of the CCD camera 38a. The light entering portions of the respective viewing direction conversion prisms 40 face different sides on the horizontal plane.
The light entering 0 is converted downward, for example, by changing the optical path by 90 °, photoelectrically converted by the CCD camera 38a, and sent to the observation unit 23 via the cable 41 inserted into the flexible tube 22. .

Further, each lighting device 39 has a corresponding upper tube 37.
Each of the lamps has a lamp 42 provided downward in the upper end of each of the a and 37b, and an illumination direction conversion mirror 43 tilted at an angle of 45 ° toward different sides below each lamp 42, respectively. The downward light emitted from the lamp 42 is converted toward different sides by the irradiation direction conversion mirrors 43, and thereby the portions corresponding to the visual directions of the respective visual direction conversion prisms 40 are irradiated.

The upper connecting member 25 is provided with an upward mounting confirmation illumination lamp 44 located between the upper cylinders 37a and 37b, and illuminates the rising movement position of the inspection device body 21 during inspection. I'm supposed to get it.

In such an embodiment, the inspector
First, the upper cylinders 37a, 37b of the inspection device main body 21 are held in a contracted state, and the grip 27 for gripping operation is held, and the inspection device main body 10 is lifted to the inspection position of the control rod drive mechanism 11 standing on the platform 5. . At this time, the mounting confirmation proof lamp 44 and the lamp 42 of each illumination device 39 are turned on, and the insertion confirmation mirror 30 confirms the insertion position of the inspection device body 21. Then, when the predetermined height is reached, the support leg operating grip 32 is rotated to open the support leg 31, and the support leg 31 is supported on the motor bracket 15 of the control rod drive mechanism 11 in a hooked state. This completes the attachment of the inspection device body 21.

Next, the upper cylinders 37a, 37b are extended upward to a predetermined inspection position, and the position of the camera device 38 is adjusted while being confirmed by the CRT of the observation unit 23 to adjust the control rod drive mechanism flange. Set the inspection position of the part 13.

The brightness of the illumination device 39 is adjusted while checking with the observation unit 23 so that an image that is easy to inspect can be obtained. The image of the flange portion 13 captured by the camera device 38 is sent to the observation unit 23 via the cable 41 and the like, and the inspection unit 23 observes the inspection portion of the control rod drive mechanism flange portion 13.

By observing the inspection portion of the control rod drive mechanism flange portion 13, it is confirmed whether or not there is an abnormality in the external appearance of the flange portion and whether or not there is a leak during a water pressure test, and a confirmation inspection is performed to make a pass / fail judgment.

After the inspection of the control rod drive mechanism flange portion 13 at one location is completed as described above, each upper cylinder 37
a and 37b are lowered to make the entire length of the inspection device main body 21 contracted, the support leg operating grip 32 is rotated to close the support leg 31, and the inspection device main body 21 is removed. Repeat the operation.

Therefore, according to the present embodiment, the inspection device main body 21 can be easily accessed to the inspection position of the control rod drive mechanism flange portion 13 to efficiently and surely perform the leakage inspection during the water pressure test and the periodic inspection. You can do it.

Further, in the present embodiment, the inspection device main body 21 is provided with a pair of parallel cylinders 24a, 24b, and the upper cylinders 37a, 37 of each cylinder 24a, 24b.
The camera device 38 and the illuminating device 3 with different directions to b
Since 9 is provided, the two control rod drive mechanism flange portions 13 are provided.
Can be observed simultaneously, and the efficiency can be further improved.

Further, since the insertion confirmation mirror 30 can adjust the direction of the reflecting surface by rotating it on the horizontal plane by the mirror adjusting grip 28 provided on the one cylindrical body 24a, the insertion position of the inspection apparatus main body 21. Can be determined more reliably.

Further, a pair of parallel cylindrical bodies 24a, 24b
By providing the grip operation grip 27, the mirror support grip 28, the support leg actuating grip 32, and the like at the predetermined portions, the operation can be performed more easily.

[0045]

As described above in detail, according to the present invention, it is possible to easily access the inspection position of the control rod drive mechanism flange portion, and efficiently perform the leakage inspection during the hydraulic pressure test and the periodic inspection. In addition, it is possible to surely perform, and it is possible to improve the operability and the reliability of confirming the soundness of the flange portion.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a control rod drive mechanism flange portion inspection device according to the present invention in use.

FIG. 2 is an enlarged view showing a detailed configuration of the embodiment.

FIG. 3 is a side view of FIG.

FIG. 4 is a view showing a conventional control rod drive mechanism.

FIG. 5 is a diagram showing an improved control rod drive mechanism to which the present invention is applied.

[Explanation of symbols]

 1 Reactor Pressure Vessel 5 Platform 11 Control Rod Drive Mechanism 12 Control Rod Drive Mechanism Housing 13 Flange Part 14 Shaft Sealing Housing 15 Motor Bracket 16 Motor Housing 20 Inspection Device 21 Inspection Device Main Body 22 Flexible Tube 23 Observation Unit 24 (24a, 24b) Cylindrical body 25, 26 Connecting member 27 Grip 28 Mirror adjusting grip 29 Bracket 30 Insert confirmation mirror 30a Reflective surface 31 Support leg 32 Support leg operating grip 33 Hinge part 34 Outer cylinder 35 Arm 36 Opening / closing lever 37 (37a, 37b) ) Upper tube 38 Camera device 38a CCD camera 39 Illumination device 40 Viewing direction conversion prism 41 Cable 42 Lamp

Claims (4)

[Claims] 1. A housing is inserted into a gap between control rod drive mechanism housings from below a motor drive type control rod drive mechanism housing which is vertically installed at a lower portion of a reactor pressure vessel of a boiling water reactor. An inspection device for observing the leakage of the control rod drive mechanism flange portion at the connection part, and an inspection device main body configured as a whole in the form of a rod and an inspection signal input from this inspection device main body for display. The inspection apparatus main body includes an observation unit, and the inspection device main body has an insertion having a grip for operation of gripping, a long tubular body connected above the grip, and a reflection surface obliquely upward provided at a lower end portion of the tubular body. A confirmation mirror, a support leg that is provided on the upper side of the tubular body and that can be opened and closed toward the side, a tip member that is extendable from the upper end of the tubular body, and provided on this tip member. Sideways A camera device for optically observing
An inspection device for a flange portion of a control rod drive mechanism, comprising: an illumination device provided on the tip member in the vicinity of the camera device. 2. The control rod drive mechanism flange portion inspection device according to claim 1, wherein the inspection device body includes a pair of parallel cylinders connected to each other at upper and lower end portions, and a tip member of each cylinder body is provided. An inspection device for a control rod drive mechanism flange portion, which is provided with a camera device and an illumination device for observing and irradiating different directions, respectively. 3. The control rod drive mechanism flange portion inspection device according to claim 1 or 2, wherein the insertion confirmation mirror of the inspection device main body can adjust the direction of the reflection surface by a mirror adjustment grip provided on the cylindrical body. The inspection device for the flange portion of the control rod drive mechanism, which is characterized in that 4. The control rod drive mechanism flange portion inspection device according to claim 2 or 3, wherein one of the cylinders is provided with a grip operation grip and a mirror adjustment grip.
A control rod drive mechanism flange inspection device characterized in that a support leg actuating grip is provided on the other cylinder.