ML19254E292
| ML19254E292 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/17/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Eric Turner HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 7910310421 | |
| Download: ML19254E292 (1) | |
Text
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UNITED STATES
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o NUCLEAR REGULATORY COMMISSION R EGloN IV 5g-
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611 RY AN PLAZA DRIVE, SUITE 1000
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ARLINGTON, TEX AS 76012 o,
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October 17, 1979
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In Reply Refer To:
RIV Docket Nos. 50-498/IE Bulletin No. 79-13 (Rev. 2) 50-499/IE Bulletin No. 79-13 (Rev. 2)
Houston Lighting & Power Company ATTN:
Mr. E. A. Turner, Vice President Power Plant Construction and Technical Services Post Office Box 1700 Houston, Texas 77001-Gentlemen:
The enclossd IE Bulletin 79-13, Revision 2 is forwarded to you for information. No writte response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, t)
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Karl V. Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
List of IE Bulletins Issued in the Last Six Months
)h 79108104 L/
SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY C0mlISSION OFFICE OF INSPECTION AND ENFORCEMENT WASl!INGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 2 October 16, 1979 Page 1 of 5 CRACMG IN FEEDWATER SYSTEM PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the results of the radio-graphic exaninations and ongoing 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 at d 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 % facility. The cracking was discovered follcwing 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 lo.ation on both Units 1 and 2.
On May 25, 1979, a letter was sent to all PWR licennees by the Office of M.-lear 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 irrmediately conduct volumetric examination of certain feedwater pipin 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 Onofre Unit 1.
On June 15, 197" Carolina Power and Light reported that radiography showed crack indic; ons in similar locations at their II. B.
Robinson Unit 2.
Duquesne Power and Ligh
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radiography has shown cracking in their B to-sel nozzle weld.
Public Service El DUPLICATE DOCUMENT NOTE: R1 and R2 indicates lines revised Entire documeilt previously entered into system under:
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