ML15117A248
| ML15117A248 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/29/1994 |
| From: | Wiens L Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9408040262 | |
| Download: ML15117A248 (5) | |
Text
110 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 July 29, 1994 Docket Nos. 50-269, 50-270 and 50-287 Licensee:
Duke Power Company Facility: Oconee Nuclear Station, Units 1, 2, and 3
SUBJECT:
SUMMARY
OF JULY 12, 1994, MEETING WITH DUKE POWER COMPANY ON KEOWEE PROBABILISTIC RISK ASSESSMENT PROJECT On July 12, 1994, NRC staff members met with representatives of Duke Power Company (DPC) at their Corporate office to review and discuss the Probabilistic Risk Assessment (PRA) being performed for the Keowee hydrostation. Meeting attendees are enclosed. During this meeting, the licensee presented a description of draft system fault trees and the preliminary process for plant-specific data collection.
The licensee discussed the draft system fault tree models which were completed in June 1994. These models were provided to the NRC staff for review on July 1, 1994. The staff discussed the scope of the project at length with the licensee. The licensee's effort is focused on the ability of the Keowee hydro units to provide power to the Oconee startup transformers and the standby transformer. The staff questioned the licensee about their rationale for limiting the project scope in this fashion rather than including all possible emergency power sources and their ability to provide power down to the Oconee emergency busses.
The licensee stated that, although Keowee was treated as a "black box" in the PRA used for the Oconee Individual Plant Examination (IPE), the IPE modeled all other aspects of the Oconee AC power system with adequate detail.
Therefore, it was DPC's intent for this Keowee PRA to be more of a "Keowee Vulnerability Study."
The staff agreed that the licensee's response seemed reasonable, but that in order to make an overall assessment of Oconee's existing emergency power system, the results would need to be integrated into the existing IPE PRA. The licensee had not made a final determination as to whether to integrate the results into the IPE PRA, but indicated that if the results validated the "black box" values used in the PRA model, such an integration would probably not be necessary. The issue remained open, and the NRC staff stated they would provide further feedback concerning the need for such integration.
The licensee also discussed the preliminary process for Keowee plant-specific data collection. Draft reliability data is scheduled to be available by the end of July 1994.
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July 29, 1994 Other discussions were held on the possibility of performing sensitivity studies using the Keowee PRA data, and whether the data would be incorporated into the IPE PRA update planned for late 1995. Although the licensee indicated they were considering these issues, no decision had been made. The meeting closed with a discussion of when the next progress review meeting should be held. No specific date was agreed to, but the licensee indicated that by September sufficient progress would have been made to justify another meeting. The NRC staff stated that if the reliability data was provided in time to provide adequate review prior to the meeting date, the September timeframe appeared to be satisfactory.
Original signed by:
Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Meeting Attendees cc w/enclosure:
See next page DISTRIBUTION:
NRC & Local PDRs L. Wiens PDII-3 R/F E. Merschoff, Ru V. Beaston, 0-7 E4 W.Russell/F.Miraglia, 0-12 G18 C. Craig, 0-17 G21 OGC, 0-15 B18 ADPR/NRR, 0-12 G18 ACRS (10), TWFN S. Varga L. Berry G. Lainas H. Berkow J. Shackelford, Ru E. Jordan, T-4 D18 S. Rosenberg, 0-10 E4 R. E. Carroll, Jr, RI P. Harmon, R H OFFICE PDII-3/I!AX-P7 J;b D,
ID_____
I____I MAWL.
BERRY L
IENS rkL Berry AE
/9/-1/94
/Z194 OFFICIAL RECORU COPY FILE NAME: G:\\OCONEE\\PRAMTGSU.JUL
2 _
July 29, 1994 Other discussions were held on the possibility of performing sensitivity studies using the Keowee PRA data, and whether the data would be incorporated into the IPE PRA update planned for late 1995. Although the licensee indicated they were considering these issues, no decision had been made. The meeting closed with a discussion of when the next progress review meeting should be held. No specific date was agreed to, but the licensee indicated that by September sufficient progress would have been made to justify another meeting. The NRC staff stated that if the reliability data was provided in time to provide adequate review prior to the meeting date, the September timeframe appeared to be satisfactory.
Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Meeting Attendees cc w/enclosure:
See next page
Duke Power Company Oconee Nuclear Station cc:
A. V. Carr, Esquire Mr. Steve Benesole Duke Power Company Compliance 422 South Church Street Duke Power Company Charlotte, North Carolina 28242-0001 Oconee Nuclear Site P. 0. Box 1439 J. Michael McGarry, III, Esquire Seneca, South Carolina 29679 Winston and Strawn 1400 L Street, NW.
Mr. Marvin Sinkule, Chief Washington, DC 20005 Project Branch #3 U. S. Nuclear Regulatory Commission Mr. Robert B. Borsum 101 Marietta Street, NW. Suite 2900 Babcock & Wilcox Atlanta, Georgia 30323 Nuclear Power Division Suite 525 Ms. Karen E. Long 1700 Rockville Pike Assistant Attorney General Rockville, Maryland 20852 North Carolina Department of Justice Manager, LIS P. 0. Box 629 NUS Corporation Raleigh, North Carolina 27602 2650 McCormick Drive, 3rd Floor Clearwater, Florida 3461.9-1035 Mr. G. A. Copp Licensing -
EC050 Senior Resident Inspector Duke Power Company U. S. Nuclear Regulatory Commission 526 South Church Street Route 2, Box 610 Charlotte, North Carolina 28242-0001 Seneca, South Carolina 29678 Mr. J. W. Hampton Regional Administrator, Region II Vice President, Oconee Site U. S. Nuclear Regulatory Commission Duke Power Company 101 Marietta Street, NW. Suite 2900 P. 0. Box 1439 Atlanta, Georgia 30323 Seneca, South Carolina 29679 Max Batavia, Chief Dayne H. Brown, Director Bureau of Radiological Health Division of Radiation Protection South Carolina Department of Health North Carolina Department of and Environmental Control Environmental Health and 2600 Bull Street Natural Resources Columbia, South Carolina 29201 P.0 Box 27687 Raleigh, North Carolina 27611-7687 County Supervisor of Oconee County Walhalla, South Carolina 29621
MEETING ATTENDEES KEOWEE PRA MEETING July 12, 1994 NAME ORGANIZATION Len Wiens NRC/NRR Stacey Rosenberg NRC/NRR Homayoon Dezfuli SCIENTECH Virgil Beaston NRC/NRR Ken Canady Duke/GO Duncan Brewer Duke/GO Mike Barrett Duke/GO P. M. Abraham Duke/GO Scott Gewehr Duke/GO Gary Cruzan Duke/GO Leo Kachnil Duke/GO Lee Kanipe Duke/GO Robert Boyer Duke/GO Mike Misenheimer Duke/GO