ML15238B442
| ML15238B442 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/17/1981 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 8109020045 | |
| Download: ML15238B442 (3) | |
Text
AUGUST i 7 1981 DISTRIBUT DISTRIBUTION Dockets Nos. 50-269, 270 Docket File JStolz and 287 NRC PDR PWagner L PDR RIngram TERA Gray File NSIC EBlackwood Mr. William 0. Parker, Jr.
ORB#4 Rdg HOrnstein Vice President -
Steam Production DEisenhut Duke Power Company OELD P. 0. Box 33189 IE-3 422 South Church Street ACRS-10 Charlotte, North Carolina 28242
Dear Mr. Parker:
In our letter of May 1980 we recommended that you initiate a program to inspect the keyway and bore areas of your low pressure discs for stress corrosion cracking. This action was prompted by the discovery of such cracks in Westinghouse turbines.
So far, the inspection program has covered one or more low pressure rotors at 15 nuclear plants using GE turbines. No clear indication of stress corrosion cracking has been discovered, although indications of water cutting and/or erosion have been observed in several turbines.
In'view of these findings, we have decided to discontinue the NRR staff monitoring of these inspections.
Normal activities of the Office of Inspection and Enforcement will continue of course.
We recommend that you continue to perform disc inspections, as appropriate, and continue to work with General Electric Company to establish safe inspection schedules. Should you find any significant degradation, such as stress corrosion cracking, we would expect you to promptly report it in the normal manner.
Sincerely, John P-'STofz, Chief Operating Re actors Branch,*
-C" Division of Licensing.0 cc:
See next page b8109020045 810817 PDR ADOCK 05000269
- G PDR OFFICEO.... Q R#;
Rk.
_SURNAME0 PWagne,
JStolz
- ,D
...1......1
..e................
NRC FORM 318 110/80) NRCM 0240 OFFICIAL RECORD COPY
- ,USGPO 1980-329-824
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON; D. C. 20555 August 17, 1981 Dockets Nos. 50-269, 270 and 287 Mr. William 0. Parker, Jr.
Vice President - Steam Production Duke Power Company P. 0. Box 33189 422 South Church Street Charlotte, North Carolina 28242
Dear Mr. Parker:
In our letter of May 1980 we recommended that you initiate a program to inspect the keyway and bore areas of your low pressure discs for stress corrosion cracking. This action was prompted by the discovery of such cracks in Westinghouse turbines.
So far, the inspection program has covered one or more low pressure rotors at 15 nuclear plants using GE turbines. No clear indication of stress corrosion cracking has been discovered, although indications of water cutting and/or erosion have been observed in several turbines.
In view of these findings, we have decided to discontinue the NRR'staff monitoring of these inspections. Normal activities of the Office of Inspection and Enforcement will continue of course.
We recommend that you continue to perform disc inspections, as appropriate, and continue to work with General Electric Company to establish safe inspection schedules. Should you find any significant degradation, such as stress corrosion cracking, we would expect you to promptly report it in the normal manner.
Sincerely, John F. Stolz, Chief Operating Reactors Branch. #4 Division of Licensing cc: See next page
Duke Power Company cc w/enclosure(s):
Mr. William L. Porter Duke Power Company P. 0. Box 33189 422 South Church Street Office of Intergovernmental Relations Charlotte, North Carolina 28242 116 West Jones Street Oconee County Library Raleigh, North Carolina 27603 501 West Southbroad Street Walhalla, South Carolina 29691 Honorable James M. Phinney County Supervisor of Oconee County Walhalla, South Carolina 29621 Regional Radiation Representative EPA Region IV 345 Courtland Street, N.E.
Atlanta, Georgia 30308 Mr. Francis Jape U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 J. Michael McGarry, III, Esq.
DeBevoise & Liberman 1200 17th Street, N.W.
Washington, D. C. 20036