ML19246B161
| ML19246B161 | |
| Person / Time | |
|---|---|
| Site: | Sterling |
| Issue date: | 06/25/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arthur J ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7907120581 | |
| Download: ML19246B161 (1) | |
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June 25, 1979 Docket No. 50-485 Rochester Gas & Electric Corporation ATTN:
Mr. J. E. Arthur Chief Engineer 89 East Avenue Rochester, New '.'ork 14649 Gentlemen:
ihe enclosed Bulletin 79-13 is forwarded to you for information. No written response is required.
If you desire ajditional information regarding this matter, please contact this office.
Sincerely,
.mwM1. &&
yce H. Grier h ector V
Enclosures:
1.
IE Bulletin No. 79-13 w/ Attachments 2.
List of IE Bulletins Issued in Last 12 Months cc w/encls:
C. R. Anderson, Manager, QA Lex K. Larson, Esquire N. A. Petrick, Executive Director, SNUPPS Gerald Charnoff, Esquire
,G 342 2b 7007120f8l
ENCLOSURE 1 UNITED STATES NUCLEAR REGbLATORY C0ftt1ISSION OFFICE OF INSPECTION AND ENFORCEf!ENT WASHINGTON, D.C.
20555 IE Bulle;.in No. 79-13 Date:
June 25, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On fiay 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 fiay 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 May 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 ceneric nature of the cracking problem, the Office of Inspection and Enforcement reauested 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 Hestinchouse steam gern_rators 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 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. Misconsin Public Service company decided on June 20, 1979 to cut out a feedwater nozzle-to-pipe weld which contained questionable indication, for metallurgical examination.
As of Ju n 22, 1979 and since May 15, 1979 seven other PUR 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. C
.1 weld joint detail showing the principal
.r? shown on the attached figure 3.
DUPLICATE DOCUMENT
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Unit 1, a leak was discovered in the ve into system under:
the 16-inut diameter feedwater piping t nondestactw, a examinction of all nozzl ANO 7 k M M m,
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