Patent US4169758A successfully refreshed from Google Patents.
US4169758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear reactor vessel inspection apparatus
Assignee: McDermott Technology Inc
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Filing: 1977-10-26
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Granted: 1979-10-02
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Expires: 1997-10-26
Abstract
Abstract Apparatus for the in situ inspection of a nuclear reactor vessel to detect the location and character of flaws in the walls of the vessel, in the welds joining the various sections of the vessel, in the welds joining attachments such as nozzles, elbows and the like to the reactor vessel and in such attachments wherein an inspection head carrying one or more ultrasonic transducers follows predetermined paths in scanning the various reactor sections, welds and attachments.
Inventors
- 👤 Eugene G. Blackstone
- 👤 Richard A. Lofy
- 👤 Lawrence P. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/003; G21C17/01; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
In an apparatus for scanning the interior surfaces of a vertical cylindrical nuclear reactor vessel filled with collant and having an upper vessel flange and the top closure head removed to expose said flange, the combination comprising, a ring girder supported from the open end, a rotatable bridge spanning said girder, a carriage supported by and linearly movable in forward and reverse directions along said bridge, an axially movable vertical mast supported in said carriage depending into the reactor vessel, a boom supported by said mast extending at a right angle therefrom toward the cylindrical surface of the reactor vessel, and an articulated ultrasonic transducer inspection head carried by said boom axially aligned with and extending beyond the end of said boom remote from said mast.
Claim 2
Dependent Claim
126 words
In an apparatus for scanning the interior surfaces of a vertical cylindrical nuclear reactor vessel filled with collant and having an upper vessel flange and the top closure head removed to expose said flange, the combination comprising, a ring girder supported from the open end, a rotatable bridge spanning said girder, a carriage supported by and linearly movable in forward and reverse directions along said bridge, an axially movable vertical mast supported in said carriage depending into the reactor vessel, a boom supported by said mast extending at a right angle therefrom toward the cylindrical surface of the reactor vessel, and an articulated ultrasonic transducer inspection head carried by said boom axially aligned with and extending beyond the end of said boom remote from said mast.
Claim 3
Dependent Claim
16 words
Apparatus in accordance with claim 1 wherein said inspection head is rotatably supported in said boom.
Claim 4
Dependent Claim
16 words
Apparatus in accordance with claim 2 wherein said inspection head is pivotly joined to said boom.
Claim 5
Dependent Claim
51 words
Apparatus in accordance with claim 3 wherein said inspection head comprises a base pivotly joined to said boom, a housing rotatably mounted on said base, a shaft supported in and axially movable relative to said housing carrying a second base for supporting a first ultrasonic transducer axially aligned with said shaft.
Claim 6
Dependent Claim
28 words
Apparatus in accordance with claim 4 further including a second and a third ultrasonic transducer supported by said second base each independently movable relative to said first transducer.
Claim 7
Dependent Claim
30 words
Apparatus according to claim 5 further including means supported by said second base guiding said second and third transducers along an arcuate path when moving relative to said first transducer.
Claim 8
Dependent Claim
10 words
Apparatus according to claim 1 wherein said mast is hollow.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 1 further including means producing a flow of a gas under pressure through said mast.
Claim 10
Dependent Claim
46 words
Apparatus according to claim 6 further including a contour control unit operatively connected to and automatically controlling the positioning of said bridge, carriage, mast and inspection head to thereby cause said inspection head to follow predetermined paths in scanning the interior surface of the reactor vessel.
Claim 11
Dependent Claim
24 words
Apparatus according to claim 1 further including a first television camera mounted on said inspection head for scanning the surface of the reactor vessel.
Claim 12
Dependent Claim
27 words
Apparatus according to claim 9 wherein said contour control unit includes means constraining the positioning of said bridge, carriage, mast and inspection head to within predetermined limits.
Claim 13
Dependent Claim
26 words
Apparatus according to claim 1 further including a second television camera pivotly mounted on said mast in axial alignment with the longitudinal axis of said boom.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |