JP3570461B2 - Penetration inspection adapter for J welding groove - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a penetrant inspection apparatus, and more particularly, to a penetrant inspection adapter for a J weld groove surface of a penetrant inspection apparatus used at the time of CRD replacement.
[0002]
[Prior art]
For example, as shown in FIG. 3, a hollow CRD housing 3 penetrates a through-hole 2 provided in a lower mirror 1 of the reactor pressure vessel and extends upward in the reactor pressure vessel. It is welded to the upper surface of the stub tube 4 which is welded to the upper surface of the mirror 1. Further, a CRD 5 (Control Rod Drive: control rod driving mechanism) penetrates through the CRD housing 3 to drive a control rod in the reactor pressure vessel.
[0003]
In such a reactor pressure vessel, the CRD housing 3 may be replaced. In this case, the CRD housing 3 and the stub tube 4 are cut and removed while the CRD 5 is removed, and the welded portion 4a is cut and polished. A new stub tube 4 needs to be welded to the polished surface after overlay welding.
In this case, after overlay welding on the polished surface of the lower mirror 1 and after welding of a new stub tube 4, it is necessary to inspect the welded portion 4a for damage by penetrant inspection. However, since the inspection site is extremely narrow and inaccessible to humans, there has been a demand for a device for performing this penetrant inspection by remote control.
[0004]
FIG. 4 is an overall configuration diagram of a penetrant inspection device created by the present applicant to satisfy such a demand. This device comprises a support frame 7 suspended by a suspending means (for example, a wire rope 7a) so as to be able to ascend and descend inside the seal pipe 6, and an adapter mounting plate rotatably mounted below the support frame 7. 9, and various penetrant inspection adapters 10 (PT adapters) are mounted on the lower surface of the adapter mounting plate 9. Further, a control unit 13 (CCU) is built in the support frame 7 to supply and control a necessary power supply to the PT adapter 10.
[0005]
With the above-described configuration, the inspection location is set to an aerial environment by the seal pipe 6, the support frame 7 is suspended in the seal pipe 6, the PT adapter 10 is positioned at a predetermined position, and the PT adapter 10 of the penetrant detection device is remotely operated. Can perform various tests.
[0006]
[Problems to be solved by the invention]
However, in the above-described conventional penetrant inspection apparatus, it is necessary to replace equipment (injection nozzle and camera) used in the four steps of cleaning, drying, penetrating liquid application, and observation for each operation. It is necessary to collect the device from the seal pipe, and it takes about 30 minutes to collect, exchange, reinsert, and set up the device. Further, there is a problem that the operation cable connected to the connector is wound up and rewinded at the time of collection and insertion, so that the cable is burdened.
[0007]
In particular, part B shown in FIG. 5 is a J-weld groove surface, and it is necessary to clean, dry, apply a penetrant, and observe the groove surface from the inside.
[0008]
The present invention has been made to solve such a problem. That is, the object of the present invention is to perform the four steps of cleaning, drying, application of the penetrant, and observation of the J-weld groove shown in FIG. 5 without changing the apparatus, thereby reducing the inspection work time. An object of the present invention is to provide an inspection adapter for a penetrant inspection device that can be shortened and can reduce the burden on an operation cable.
[0009]
[Means for Solving the Problems]
According to the present invention, a support frame suspended by a suspending means so as to be able to ascend and descend in a seal pipe, a control unit built in the support frame, and a pivotally mounted lower portion of the support frame. A penetrating flaw detection inspection adapter for a J-weld groove including an adapter mounting plate, wherein the inspection adapter is inserted into a center hole of a bore plug inserted into a through hole of the lower mirror to position a lower end. A support portion, a revolving frame attached to the lower surface of the adapter mounting plate, a hollow cylindrical guide pipe extending from the revolving frame to the lower end support portion concentrically with the center axis of the seal pipe, and a lift moving up and down along the guide pipe And a permeate injection nozzle, a washing water injection nozzle, a dry air injection nozzle, a water absorption nozzle, and an observation camera attached to the elevating member. It has an outer peripheral surface located on the inner side, and the outer peripheral surface is provided with a through groove extending upward from a position lower than the J welding groove surface, through each of the nozzles and the observation camera through the through groove, A penetrant inspection adapter for a J-weld groove, characterized in that the J-weld groove is cleaned, dried, applied with a penetrant, and observed, and absorbs excess liquid. .
[0010]
According to the configuration of the present invention, the permeate injection nozzle, the washing water injection nozzle, the dry air injection nozzle, the water absorption nozzle, and the observation camera are attached to the elevating member that moves up and down inside the hollow cylindrical guide pipe. By positioning each device at the optimum height and turning it, the nozzle and the observation camera are used to wash, dry, apply the permeate, observe the J weld groove through the through-groove of the guide pipe, and use the water absorption nozzle. This allows excess water to be absorbed and removed.
[0011]
Therefore, each process can be performed sequentially without replacing the device, thereby shortening the inspection work time of the J-weld groove surface and reducing the load on the operation cable.
[0012]
According to a preferred embodiment of the present invention, the permeate injection nozzle, the washing water injection nozzle, the dry air injection nozzle, and the observation camera are arranged diagonally downward from the bottom in order, and the through grooves are diametrically opposed. The observation camera is arranged from one through-groove to each nozzle at a predetermined height from the other through-groove toward the J-weld groove face B, and the water-absorbing nozzle passes through the through-groove. It extends to the outer bottom of the stub tube.
[0013]
With this configuration, excess water can be absorbed and removed by the water-absorbing nozzle at a position lower than the J-weld groove surface B, preventing the observation camera (CCD) from being wet by each liquid, and preventing the wetting of the dry air injection nozzle by the penetrant and the cleaning liquid. Thus, it is possible to prevent the permeate from adhering to the washing water injection nozzle.
[0014]
The motor further includes an elevating motor mounted on the revolving frame, and a ball screw rotated about a vertical axis by the elevating motor. The elevating member is moved up and down by rotation of the ball screw. With this configuration, the lifting member can be raised and lowered with high accuracy, and the height of each inspection device can be accurately positioned on the J-weld groove surface B.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, common portions are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is an overall configuration diagram of a penetrating inspection apparatus equipped with a penetrating inspection adapter 10 for a J-weld groove according to the present invention, and FIG. 2 is a side view of the inspection adapter 10. The inspection adapter 10 shown in FIGS. 1 and 2 uses the J-weld groove face B shown in FIG. 5 as an inspection location.
[0016]
As shown in FIG. 1, the penetrant inspection device is suspended by suspending means (for example, a wire rope 7 a), and is supported by a support frame 7 which can move up and down in the seal pipe 6. A control unit 20 and an adapter mounting plate 9 pivotally mounted below the support frame 7. The penetrating inspection apparatus further includes a turning motor 16a mounted on the support frame 7, and a gear train (swing gear 16b) driven by the turning motor 16a, and an adapter mounted by the turning motor 16a via the turning gear 16b. The plate 9 is turned around a vertical center axis Z-Z.
[0017]
As shown in FIGS. 1 and 2, the inspection adapter 10 includes a lower end support 21, a turning frame 22, a hollow cylindrical guide pipe 23, an elevating member 24, and a plurality of inspection devices 28.
The lower end support 21 is inserted into the center hole of the bore plug 11 inserted into the through hole 2 of the lower mirror 1 to position the lower end. The revolving frame 22 is mounted on the lower surface of the adapter mounting plate 9 and revolves around a vertical center axis Z-Z by a revolving motor 16a. The guide pipe 23 extends from the turning frame 22 to the lower end support 21 concentrically with the center axis of the seal pipe 6. The elevating member 24 moves up and down along the guide pipe 23, and a plurality of inspection devices 28 are attached to the elevating member 24.
[0018]
As shown in FIG. 2, the inspection adapter 10 includes an elevating motor 18a attached to the revolving frame 22, and a ball screw 18b rotated about a vertical axis by the elevating motor 18a. It is raised and lowered by rotation. With this configuration, the elevating member 24 can be raised and lowered with high accuracy, and the height of each inspection device 28 can be accurately positioned at a predetermined inspection position. In FIG. 2, reference numeral 19 denotes a linear guide that guides the lifting member 24 without rotating the lifting member 24, and reference numeral 25 denotes a cable carrier that connects a power line and a signal line from the control unit 20 to the lifting member 24.
[0019]
As shown in FIG. 1, the inspection device 28 is a permeate injection nozzle 28a, a washing water injection nozzle 28b, a dry air injection nozzle 28c, a water absorption nozzle 28d, and an observation camera 28e, among which the permeate injection nozzle 28a, The cleaning water injection nozzle 28b, the dry air injection nozzle 28c, and the observation camera 28e are arranged in an obliquely downward direction from below.
[0020]
With this configuration, excess water can be absorbed and removed by the water-absorbing nozzle at a position lower than the J-weld groove surface, preventing wetting by the liquid of the observation camera (CCD), and preventing wetting of the dry air injection nozzle by the penetrating liquid and the cleaning liquid. Further, it is possible to prevent the permeated liquid from adhering to the washing water injection nozzle.
[0021]
Further, the guide pipe 23 has an outer peripheral surface located inside the J-weld groove surface B. The outer peripheral surface is provided with a through groove 23a extending upward from a position lower than the J-weld groove surface B. ing. In this embodiment, a pair of the through-grooves 23a is provided in a diametrically opposed manner.
The observation camera 28e is arranged from one through groove 23a to each nozzle 28a, 28b, 28c at a predetermined height from the other through groove 23a toward the J welding groove surface B. The water absorption nozzle 28d extends to the outer bottom of the stub tube 4 through the through groove 23a.
[0022]
With the configuration of the present invention described above, each device is positioned at the optimum height and rotated, so that the nozzle B and the observation camera are used to wash, dry, and apply a penetrating liquid to the J welding groove surface B through the through groove of the guide pipe. , And observation, and excess water can be absorbed and removed by a water absorption nozzle.
Therefore, each step can be performed sequentially without replacing the device, thereby shortening the inspection work time of the J-weld groove face B and reducing the load on the operation cable.
[0023]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.
[0024]
【The invention's effect】
As described above, the penetrating inspection adapter for J-weld groove of the present invention performs the four steps of cleaning, drying, applying the penetrant, and observing the J-welded groove without changing the apparatus. This has an excellent effect that the inspection work time can be shortened and the load on the operation cable can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a penetrating inspection apparatus provided with a penetrating inspection adapter for a J-weld groove surface according to the present invention.
FIG. 2 is a side view of the inspection adapter of FIG.
FIG. 3 is a longitudinal sectional view of a lower mirror portion of the reactor pressure vessel.
FIG. 4 is an overall configuration diagram of a penetration testing device provided with a conventional inspection adapter.
FIG. 5 is a longitudinal sectional view of a lower mirror portion having a J-weld groove surface to which the present invention is applied.
[Explanation of symbols]
1 lower mirror 2 through hole 3 CRD housing 4 stub tube 5 CRD
6 Seal pipe 7 Support frame 9 Adapter mounting plate 10 Penetration inspection adapter (PT adapter)
11 Bore plug 12 Lifting shaft 13 Control unit (CCU)
13a connector 13b cable 16 turning device 16a turning motor 16b gear train (turning gear)
18 Elevating device 18a Elevating motor 18b Ball screw 19 Linear guide 20 Control unit 21 Lower end support portion 22 Revolving frame 23 Guide pipe 24 Elevating member 25 Cable carrier 28 Inspector 28a Penetrant injection nozzle 28b Wash water injection nozzle 28c Dry air injection nozzle 28d Water absorption Nozzle 28e Observation camera (CCD)

Claims (3)

A support frame suspended by the suspending means so as to be able to move up and down in the seal pipe, a control unit built in the support frame, and an adapter mounting plate pivotally attached to a lower portion of the support frame. A penetrant inspection adapter for a J-weld groove surface provided with:
The inspection adapter has a lower end support portion for positioning a lower end by being inserted into a center hole of a bore plug inserted into a through hole of the lower mirror, a turning frame attached to the lower surface of the adapter attachment plate, and a central axis of the seal pipe. A hollow cylindrical guide pipe concentrically extending from the revolving frame to the lower end support portion, an elevating member that moves up and down along the guide pipe, a permeate injection nozzle, a washing water injection nozzle, and a dry air injection attached to the elevating member Consisting of a nozzle, a water absorption nozzle, and an observation camera,
The guide pipe has an outer peripheral surface located inside the J-weld groove surface, and the outer peripheral surface is provided with a through groove extending upward from a position lower than the J-weld groove surface. Cleaning, drying, applying a permeating liquid and observing the J-weld groove surface with the nozzles and the observation camera through the groove, and absorbing excess liquid. Penetrant inspection adapter. The permeate injection nozzle, the washing water injection nozzle, the dry air injection nozzle, and the observation camera are arranged diagonally downward from the bottom in order, and the through-grooves are provided in a pair diametrically opposed to each other, and the observation camera is From one through groove, each nozzle is arranged at a predetermined height from the other through groove toward the J-weld groove surface, and the water-absorbing nozzle extends to the outer bottom of the stub tube through the through groove. The penetrant inspection adapter for a J-weld groove surface according to claim 1, wherein: 2. The J according to claim 1, further comprising an elevating motor mounted on a revolving frame, and a ball screw rotated by a vertical motor by the elevating motor, wherein the elevating member is elevated by rotation of the ball screw. 3. Penetration inspection adapter for welding groove surface.

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