ML051940468
| ML051940468 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/26/2005 |
| From: | NRC/NRR/DLPM/LPD2 |
| To: | Duke Energy Corp |
| Olshan L N, NRR/DLPM, 415-1419 | |
| Shared Package | |
| ML051940482 | List: |
| References | |
| TAC MC7234 | |
| Download: ML051940468 (4) | |
Text
July 26, 2005 LICENSEE:
DUKE ENERGY CORPORATION FACILITY:
OCONEE NUCLEAR STATION, UNIT 1, 2, AND 3
SUBJECT:
SUBJECT OF JUNE 22, 2005, MEETING TO DISCUSS RESULTS OF SPRING 2005 STEAM GENERATOR INSPECTION AT OCONEE NUCLEAR STATION, UNIT 1 (TAC NO. MC7234)
On June 22, 2005, the Nuclear Regulatory Commission (NRC) met with Duke Energy Corporation (the licensee) to discuss the results of the Spring 2005 steam generator inspection at Oconee Nuclear Station (Oconee), Unit 1. Attachment 1 provides a list of the attendees. contains the slides presented by the licensee during the meeting.
The steam generators at Oconee, Unit 1 were replaced during the Fall 2003 refueling outage.
This was the first replacement of once-through steam generators (i.e., steam generators with straight tubes rather than U-bend tubes).
During the 2005 steam generator tube inspections at Oconee, Unit 1, a significant number of tubes (approximately 3200) were found to have wear indications after only 14 months of operation. None of the wear indications were safety significant; however, given the large number of tubes affected, the licensee and the steam generator fabricator (B&W Canada) began a comprehensive investigation into the cause. The investigation is on-going and no single cause has been identified; however, the consensus of industry experts is that the steam generators are experiencing flow-induced wear. The excitation force for this wear is not known at this time.
The root cause investigation is expected to continue through the end of 2005. Some of the corrective actions being considered include (1) pulling tubes from Oconee, Unit 2 during its Fall 2005 outage (Oconee, Units 2 and 3 have similar replacement steam generators to those used at Oconee, Unit 1), (2) installing additional instrumentation (pressure transducers and accelerometers) on the Oconee, Unit 2 steam generators during the Fall 2005 outage, (3) and performing additional tests and analytical analysis.
The licensee has installed Nitrogen-16 monitors in each of the three units to assist in primary-to-secondary leak detection. In addition, the actions to take upon detection of primary-to-secondary leakage, including a tube rupture event, have been reviewed with the operators.
NRR and Region II continue to follow the licensees investigations.
Attachments: As stated cc w/atts: See next page
July 26, 2005 LICENSEE:
DUKE ENERGY CORPORATION FACILITY:
OCONEE NUCLEAR STATION, UNIT 1, 2, AND 3
SUBJECT:
SUBJECT OF JUNE 22, 2005, MEETING TO DISCUSS RESULTS OF SPRING 2005 STEAM GENERATOR INSPECTION AT OCONEE NUCLEAR STATION, UNIT 1 (TAC NO. MC7234)
On June 22, 2005, the Nuclear Regulatory Commission (NRC) met with Duke Energy Corporation (the licensee) to discuss the results of the Spring 2005 steam generator inspection at Oconee Nuclear Station (Oconee), Unit 1. Attachment 1 provides a list of the attendees. contains the slides presented by the licensee during the meeting.
The steam generators at Oconee, Unit 1 were replaced during the Fall 2003 refueling outage.
This was the first replacement of once-through steam generators (i.e., steam generators with straight tubes rather than U-bend tubes).
During the 2005 steam generator tube inspections at Oconee, Unit 1, a significant number of tubes (approximately 3200) were found to have wear indications after only 14 months of operation. None of the wear indications were safety significant; however, given the large number of tubes affected, the licensee and the steam generator fabricator (B&W Canada) began a comprehensive investigation into the cause. The investigation is on-going and no single cause has been identified; however, the consensus of industry experts is that the steam generators are experiencing flow-induced wear. The excitation force for this wear is not known at this time.
The root cause investigation is expected to continue through the end of 2005. Some of the corrective actions being considered include (1) pulling tubes from Oconee, Unit 2 during its Fall 2005 outage (Oconee, Units 2 and 3 have similar replacement steam generators to those used at Oconee, Unit 1), (2) installing additional instrumentation (pressure transducers and accelerometers) on the Oconee, Unit 2 steam generators during the Fall 2005 outage, (3) and performing additional tests and analytical analysis.
The licensee has installed Nitrogen-16 monitors in each of the three units to assist in primary-to-secondary leak detection. In addition, the actions to take upon detection of primary-to-secondary leakage, including a tube rupture event, have been reviewed with the operators.
NRR and Region II continue to follow the licensees investigations.
Attachments: As stated cc w/atts: See next page Distribution:
PUBLIC RidsRgn2MailCenter PDII-1 R/F JDavis RidsNrrPMLOlshan (Hard Copy)
KKarwoski RidsOgcRP LLund RidsAcrsAcnwMailCenter MMayfield RidsNrrDlpm (LMarsh)
TMintz RidsNrrDlpmLpdii (EHackett)
EMurphy RidsNrrDlpmLpdii1 (EMarinos)
LOlshan RidsNrrLACHawes (Hard Copy)
SVias TMensah JJolicoeur Package: ML051940482 Meeting Notice: ML051580629 Attach2: ML052080113 Accession Number: ML051940468 NRC-001 OFFICE PDII-1/PM PDII-1/LA PDII-1/SC NAME LOlshan CHawes EMarinos DATE 7/26/05 7/26/05 7/26/05 OFFICIAL RECORD COPY LIST OF ATTENDEES MEETING TO DISCUSS RESULTS OF SPRING 2005 STEAM GENERATOR INSPECTION AT OCONEE NUCLEAR STATION, UNIT 1 JUNE 22, 2005 NRC DUKE J. Davis T. Alley K. Karwoski S. Capps L. Lund G. Davenport M. Mayfield J. Davis T. Mintz R. Eaker E. Murphy D. Mayes L. Olshan M. Robinson S. Vias (by telephone)
OTHER J. Albert, B&W Canada N. Idvorian, B&W Canada R. Klarner, B&W Canada D. Lee, B&W Canada E. Bird, MPR Associates
Oconee Nuclear Station, Units 1, 2, and 3 cc:
Ms. Lisa F. Vaughn Duke Energy Corporation Mail Code - PB05E 422 S. Church St.
P.O. Box 1244 Charlotte, NC 28201-1244 Ms. Anne W. Cottingham, Esq.
Winston and Strawn LLP 1700 K St, NW Washington, DC 20006 Manager, LIS NUS Corporation 2650 McCormick Dr., 3rd Floor Clearwater, FL 34619-1035 Senior Resident Inspector U.S. Nuclear Regulatory Commission 7812B Rochester Highway Seneca, SC 29672 Mr. Henry Porter, Director Division of Radioactive Waste Management Bureau of Land and Waste Management Dept. of Health and Env. Control 2600 Bull St.
Columbia, SC 29201-1708 Mr. Michael A. Schoppman Framatome ANP 1911 North Ft. Myer Dr.
Suite 705 Rosslyn, VA 22209 Mr. B. G. Davenport Regulatory Compliance Manager Oconee Nuclear Site Duke Energy Corporation ON03RC 7800 Rochester Highway Seneca, SC 29672 Ms. Karen E. Long Assistant Attorney General NC Department of Justice P.O. Box 629 Raleigh, NC 27602 Mr. R. L. Gill, Jr.
Manager - Nuclear Regulatory Issues and Industry Affairs Duke Energy Corporation 526 S. Church St.
Mail Stop EC05P Charlotte, NC 28202 Mr. Richard M. Fry, Director Division of Radiation Protection NC Dept of Environment, Health, & Natural Resources 3825 Barrett Dr.
Raleigh, NC 27609-7721 Mr. Peter R. Harden, IV VP-Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road 12th Floor Charlotte, NC 28210 Mr. Henry Barron Group Vice President, Nuclear Generation and Chief Nuclear Officer P.O. Box 1006-EC07H Charlotte, NC 28201-1006