ML19224D553
| ML19224D553 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 06/25/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7907120596 | |
| Download: ML19224D553 (1) | |
Text
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June 25, 1979 In Reply Refer To:
RIV Docket No. 50-458/IE Bulletin 79-13 50-459/IE Bulletin 79-13 Gulf States Utilities ATTN: Dr. J. ';. Weigand, General Manager Nuclear Projects Post Of fice Box 2951 Beaumont, Texas 77704 Gentlemen:
The enclosed IE Bulletin 79-13 is forwarded to you or information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, 1]
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Karl V. Seyfrit j
Director
/
Enclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months 414 061 4,
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UNITED STATES NUCLEAR REGULATORY C0!!?!ISSION OFFICE OF INSPECTION AND ENFORCErfENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Date: June 25, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEll PIPING Description of Circumstances:
On riay 20, 1979, Indiana and flichigan Power Company notified the NRC 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 investigate leakage inside containment.
Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examination revealed crack indications in all eight steam generator feedwater lines at this location on both Units 1 and 2.
On ?!ay 25, 1979, a letter was sent to all PWR licensees by the Office of Nuclear 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 Enforcement requested licensees of PWR plants in current outages to immediately conduct volumetric examination 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 generate of San Onofre Unit 1.
On June 15, 1979, Carolina Power and Light report.ed that radiography showed crack indications in similar locations at their H. B. Robinson Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwater 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 Company decided on June 20, 1979 to cut out a feedwater nozzle-to pipe weld which contained a questionable indication, for metallurgical examiation. As of June 22, 1979 and since riay 25, 1979 seven other PWR facilities have inspected the feedwater nozzle-to pipe welds without finding cracking indications.
The feedwater nozzle-to pipe conf:-
-- w n c rnnk and for San Onofre are yDUPLICATE DOCUMENT shown on the attached Figures 1 at
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J joint detail showing the principa Ent' are shown on the attached Figure Previously entered into sys e nder On ?! arch 17, 1977, during heat-up f
Unit 1, a leak was discovered in ANO_
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the 16-inch diameter feedwater pi p
NO* Of Pages:_
g nondestructive examination of all a
414 062 m
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