ML072390119
| ML072390119 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/05/2007 |
| From: | Olshan L N NRC/NRR/ADRO/DORL/LPLII-1 |
| To: | Duke Power Co |
| Olshan L N, NRR/DORL, 415-1419 | |
| References | |
| TAC MD3721, TAC MD3722, TAC MD3723, TAC MD3724, TAC MD3725, TAC MD3726 | |
| Download: ML072390119 (5) | |
Text
September 5, 2007LICENSEE:DUKE POWER COMPANY LLC (DUKE)
FACILITY:OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (OCONEE)
SUBJECT:
SUMMARY
OF AUGUST 17, 2007, MEETING TO DISCUSS THE STATUS OFTHE TORNADO AND HIGH-ENERGY LINE BREAK (HELB) EFFORTS (TAC NOS. MD3721, MD3722, MD3723, MD3724, MD3725, AND MD3726)On August 17, 2007, the U.S. Nuclear Regulatory Commission (NRC) staff met with Duke (thelicensee) to discuss the status of the Oconee tornado/HELB efforts. The handouts provided by the licensee during the meeting are available in the Agencywide Documents Access and Management System under accession number ML07230121. Enclosed is a list of the meeting attendees.The licensee stated that it intends to use the guidance provided in Regulatory Guide (RG) 1.76,"Design Basis Tornado and Tornado Missiles for Nuclear Power Plants," Revision 1, which lowers the tornado wind speed and differential pressure (but adds missiles) from that provided in RG 1.76, Revision 0. The NRC staff agreed that using RG 1.76, Revision 1 was appropriate.The NRC staff is currently reviewing a license amendment request (LAR) for Oconee thatproposes the use of fiber-reinforced polymer (FRP) to strengthen certain walls against the effects of tornado wind speed and differential pressure. The licensee stated that in the event the NRC staff does not approve the use of FRP, the licensee would install blowout panels. The NRC staff stated that by August 31, 2007, it would inform the licensee as to whether FRP could eventually be found acceptable for use at Oconee. The licensee stated that it intends to use the TORMIS methodology to determine that somecomponents needed to mitigate a tornado have an acceptably low probability of damage from tornado missiles. However, the licensee noted in Slide 9 of the handout that other licensees have recently had difficulties in obtaining NRC approval for the use of TORMIS methodology.
The NRC staff stated that this should not discourage the licensee from using TORMIS.
methodology, because these other licensees did not fully understand the TORMIS methodology. The NRC staff suggested that the licensee contact the originator of the TORMIS methodology for guidance, and the licensee stated that it had already done so. The NRC staff did not recall specifically to what extent the tornado wind speeds that are endorsed by RG 1.76, Rev. 1, are the same or similar to the enhanced Fujita scale tornado wind speeds, but the NRC staff indicated that the licensee's use of RG 1.76, Rev. 1, as endorsed by the NRC staff, is considered to be an acceptable approach. The NRC staff offered to meet with the licensee before the tornado-mitigation LAR is submitted to discuss the licensee's use of the TORMIS methodology. This LAR is currently scheduled to be submitted in January 2008.
Duke-2-The licensee stated that it is considering a significant change in its main steamline break(MSLB) mitigation strategy that may include the installation of main steamline isolation valves.
The licensee intends to decide on its MSLB mitigation strategy and engage the NRC staff in technical discussions by the end of 2007./RA/Leonard N. Olshan, Project ManagerPlant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-269, 50-270, and 50-287
Enclosure:
List of Attendees cc w/encl: See next page Duke-2-The licensee stated that it is considering a significant change in its main steamline break(MSLB) mitigation strategy that may include the installation of main steamline isolation valves.
The licensee intends to decide on its MSLB mitigation strategy and engage the NRC staff in technical discussions by the end of 2007./RA/Leonard N. Olshan, Project ManagerPlant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-269, 50-270, and 50-287
Enclosure:
List of Attendees cc w/encl: See next pageDistribution
- PublicRidsOgcRp LPL2-1 R/FS. Campbell, EDO Rgn II RidsNrrDorlLpl2-1 (EMarinos)RidsNrrDorl (TMcGinty)
RidsNrrPMLOlshan (hard copy)K. Manoly, NRC RidsNrrLAMO'Brien (hard copy)J. Tatum, NRC RidsAcrsAcnwMailCenterR. Carroll, NRC RidsRgn2MailCenter (Jmoorman)RidsNrrOd (Tech Comm. Assistant)Accession Number: ML072390119OFFICENRR/LPL2-1/PMNRR//LPL2-1/LANRR/LPL2-1/BCNAMELOlshan:ncMO'BrienEMarinosDATE 8/31/07 8/30/07 9/5/07OFFICIAL RECORD COPY MEETING ATTENDEES FROM AUGUST 17, 2007, MEETINGWITH DUKE POWER COMPANY LLC (DUKE)TO DISCUSS THE STATUS OF THE OCONEE NUCLEAR STATION, UNITS 1, 2, AND3, TORNADO AND HIGH-ENERGY LINE BREAK EFFORTS NRC DUKET. McGintyR. FreudenbergerE. MarinosS. Newman K. ManolyM. Glover J. TatumG. McAninch L. OlshanT. Brown J. Moorman (by phone)
R. Carroll (by phone)Oconee Nuclear Station, Units 1, 2, and 3 cc:Mr. Bruce H. HamiltonVice President, Oconee Site Duke Power Company LLC 7800 Rochester Highway Seneca, SC 29672Ms. Lisa F. VaughnAssociate General Counsel and Managing Attorney Duke Energy Carolinas, LLC 526 South Church Street - EC07H Charlotte, North Carolina 28202Manager, LISNUS Corporation 2650 McCormick Dr., 3rd Floor Clearwater, FL 34619-1035Senior Resident InspectorU.S. Nuclear Regulatory Commission 7812B Rochester Highway Seneca, SC 29672Mr. Henry Porter, DirectorDivision of Radioactive Waste Management Bureau of Land and Waste Management Dept. of Health and Env. Control 2600 Bull St.
Columbia, SC 29201-1708Mr. Michael A. SchoppmanFramatome ANP 1911 North Ft. Myer Dr.
Suite 705 Rosslyn, VA 22209Mr. B. G. DavenportRegulatory Compliance Manager Oconee Nuclear Site Duke Energy Corporation ON03RC 7800 Rochester Highway Seneca, SC 29672Mr. Leonard G. GreenAssistant Attorney GeneralNC Department of JusticeP.O. Box 629 Raleigh, NC 27602Mr. R. L. Gill, Jr.Manager - Nuclear Regulatory Issues and Industry Affairs Duke Power Company LLC 526 S. Church St.
Mail Stop EC05P Charlotte, NC 28202Division of Radiation ProtectionNC Dept of Environment, Health, & Natural
Resources 3825 Barrett Dr.
Raleigh, NC 27609-7721Mr. Peter R. Harden, IVVP-Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road 12th Floor Charlotte, NC 28210Mr. Henry BarronGroup Vice President, Nuclear Generation and Chief Nuclear Officer P.O. Box 1006-EC07H Charlotte, NC 28201-1006Mr. Charles BrinkmanDirector, Washington Operations Westinghouse Electric Company 12300 Twinbrook Parkway, Suite 330 Rockville, MD 20852Ms. Kathryn B. NolanSenior Counsel Duke Energy Carolinas, LLC 526 South Church Street - EC07H Charlotte, NC 28202