US4255840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of repairing a heating element in a pressurizer
Assignee: Westinghouse Electric Corp
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Filing: 1975-10-21
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Granted: 1981-03-17
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Expires: 1995-10-21
Abstract
Abstract A method of installing an immersion heater in a pressurizer for a nuclear power plant by increasing the metal mass adjacent the weld which seals the juncture between the immersion heater and a nozzle in the pressurizer.
Inventors
- 👤 Emil P. Loch
- 👤 Frank J. Mendolia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:38
CPC Classifications
G; G21; G21C; G21C1/00; G21C1/04; G21C1/06; G21C1/08; G21C1/09; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49352; Y10T29/49718; Y10T29/49721; Y10T29/49723; Y10T29/49725; Y10T29/49726; Y10T29/49728; Y10T29/4973
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
The method of replacing immersion heating elements having a metallic sheath welded to a thickened end of a tubular nozzle wherein said heating element is concentrically disposed within said nozzle and said nozzle is attached to the head portion of a pressurizer of a nuclear power plant comprising the steps of: cutting away at least a portion of a weld disposed at the external juncture of the nozzle and the heating element so that the heating element may be removed from the nozzle; removing the defective heating element from the nozzle; removing sufficient metal from the outer surface of the nozzle to remove all metal degradated by the previous weld at the juncture between the nozzle and the sheath; inserting an operable heating element in the nozzles so that there is a space between the end of the nozzle and the end of the heating element, the space being sufficient to prevent the end of the heating element from being overheated from the heat buildup during the subsequent welding step, welding a bead on the outer surface of said thickened portion of the nozzle in such a manner that there is penetration of the sheath of the heating element to form a seal therebetween and solely fix the heating element with respect to the nozzle.
Claim 2
Independent Claim
215 words
The method of replacing immersion heating elements having a metallic sheath welded to a thickened end of a tubular nozzle wherein said heating element is concentrically disposed within said nozzle and said nozzle is attached to the head portion of a pressurizer of a nuclear power plant comprising the steps of: cutting away at least a portion of a weld disposed at the external juncture of the nozzle and the heating element so that the heating element may be removed from the nozzle; removing the defective heating element from the nozzle; removing sufficient metal from the outer surface of the nozzle to remove all metal degradated by the previous weld at the juncture between the nozzle and the sheath; inserting an operable heating element in the nozzles so that there is a space between the end of the nozzle and the end of the heating element, the space being sufficient to prevent the end of the heating element from being overheated from the heat buildup during the subsequent welding step, welding a bead on the outer surface of said thickened portion of the nozzle in such a manner that there is penetration of the sheath of the heating element to form a seal therebetween and solely fix the heating element with respect to the nozzle.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |