ML19224D565
| ML19224D565 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/25/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7907120622 | |
| Download: ML19224D565 (1) | |
Text
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June 25, 1979 Docket flo. 50-344 Portland General Electric Company 121 S. W. Salmon Street Portland, Oregon 97204 Attention:
Mr. Charles Goodwin Assistant Vice President Gentlemen:
Enclosed is IE Bulletin 79-13 which requires action by you with regard to your power reactor facility (ies) with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, l
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R. H. Engelken Director
Enclosures:
1.
List of IE Bulletins Issued in Last 12 Months cc w/ enclosures:
B. Withers, PGE F. C. Gaidos, PGE klk nn$
uO 7907120627
UtlITED STATES N'JCLEAR REGULATORY COMMISSION OFFICE OF INSPECTI0ft AND ENFORCEMEflT WASHINGT0 i, D.C.
20555 June 25, 1979 IE Bulletin flo. 79-13 CRACKING IN FEED'.1ATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and flichigan Power Conpany notified the flRC of cracking in two feedwater lines at their D. C. Cook Unit 2 facility.
The cracking was discovered following a shutdown on flay 19 to ir.vestigate leakage inside containnent. Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic exanination revealed crack indications in all eight ste= generator feedwater lines at this location on both Units 1 and 2.
On flay 25, 1979, a letter was sent to all PWR licensees by the Office of fluclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fabrication, inspection and operating histories. To further explore the generic nature of the cracking problem, the Office of Inspection and Enforcerent requested licensees of PWR plants in current outages to irrediately conduct volurretric exanination of certain feedwater piping welds.
As a result of these actions, several other licensees with Westinghouse steam generators reported crack indications.
Southern California Edison reported on June 5, 1979, that radiographic examination revealed indications of cracking in feedwater nozzle-to-piping welds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reported that radiography showed crack indications in similar locations at their H. B. Robinson Unit 2.
Duquesne Power and Light confirred on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwa+.!r piping to vessel nozzle weld.
Public Service Electric and Gas Company reported on June 20, 1979 that Salem Unit 1 also has crack indications. Wisconsin Public Service conpany decided on June 20, 1979 to cut out a feedwater nozzle-to-pipe weld which contained questionable indication, for metallurgical examination. As of June 22, 1979 and since flay 25, 1979 seven other PWR facilities have inspected the feedwater nozzle-to-pipe welds without finding cracking indications.
The feedwater nozzle-to-pipe configurations for D.C. Cook and for San Onofre are shown on the attached figures 1 and 2.
A typical feedwater pipe-to-nozzle weld joint detail showing the principal crack locations for D.C. Cook and W "
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are shown on the attached figure 3.
during heat-up for [ [ pupLICATE DOCUMENT On March 17, 1977, the16-inchdiameterfeedwaterpiping(
Entire document previously entered Unit 1, a leak was discovered in th 1"to system under:
nondestructive examination of all nozz ANO ~7 /
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