ML19254E304
| ML19254E304 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 10/17/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910310433 | |
| Download: ML19254E304 (1) | |
Text
p R*'Go UNITED STATES g ) (,
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19r30 N. CALIFORNIA BOULEVARD 9,
SUITE 202, WALNUT CREEK PLAZA
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o WALNUT CREEK, CALIFORNIA 94596 October 17, 1979 Docket No. 50-133 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
Enclosed is IE Bulletin No. 79-13, Revision 2 which is forwarded to you for information.
No written response is required.
If you desi.*e additional information regarding this matter, please contact this office.
Sincerely, l W h>~~fG R. H. Engelken Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
List of IE Bulletins Issued in the Last Six Months cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay 1248 256 7910310k33@
SSINS:
6830 Accession fio.:
7908220135 UNITED STATES NUCLEAR REGULATORY COPJ4ISS10ft 0FFICE OF INSPECTI0ft AND EllFORCEMEllT WASHIfiGTON, D.C.
20555 October 16, 1979 IE Bulletin No. 79-13 Revision 2 CRACKIf1G IN FEEDWATER SYSTEf1 PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the results of the radio-i graphic examinations and ont.ing investigation of the subject problem to date since the initial Bulletin was issued.
The revision reduces in scope the R2 number and extent of the piping system welds required to be examined. The requirements for reporting and action time frame remain unchanged.
On May 20, 1979, Indiana and Michigan 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 May 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 fa' ares and requested specific information on feedwater system design, fabrication, inspection and operating histories. To further explore the genert'c 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-pipe welds on two of three steam generators of San Onofrc 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 cr- '.
4ai-+4-uiemncin Public Service company decided on June 20, 1979 tc weld which contained questionable ir.dicatic As of June 22, 1979 and since May 25, 1979 DUPLICATE DOCUMENT inspected the feedwater nozzle-to-pipe welc Entire document previously entered into system under:
NOTE:
R1 and R2 indicates lines revisec ANo MM2h M 1248 257 No. of pages: