ML16293A826
| ML16293A826 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/07/1994 |
| From: | Wiens L Office of Nuclear Reactor Regulation |
| To: | Hampton J DUKE POWER CO. |
| References | |
| TAC-M86233, TAC-M86234, TAC-M86235, NUDOCS 9403160263 | |
| Download: ML16293A826 (3) | |
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0UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 March 7, 1994 Docket Nos. 50-269, 50-270 and 50-287 Mr. J. W. Hampton Vice President, Oconee Site Duke Power Company P. 0. Box 1439 Seneca, South Carolina 29679
Dear Mr. Hampton:
SUBJECT:
OFFSITE POWER FROM THE 100KV TRANSMISSION SYSTEM OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (TAC NOS. M86233, M86234, AND M86235)
By letter dated April 14, 1993, you provided a discussion, for NRC information, of the acceptability of using the 100kV transmission system from the Central Switchyard as an offsite source of electrical power to a cold shutdown unit during periods of testing and maintenance. Subsequently, you provided the NRC staff with the 10 CFR 50.59 evaluation and supporting calculations which evaluated the installation of degraded grid voltage relays in this system. In a letter dated June 14, 1993, the NRC expressed concerns with the proposed use of the Central Switchyard as an offsite power source.
You responded to these concerns in a letter dated August 31, 1993. The NRC staff reviewed your response and found that you have adequately addressed our concerns and we have no additional questions concerning your analysis performed under 10 CFR 50.59. The staff also found the use of the Central Switchyard as an additional offsite power source could reduce conditional core damage probability during a loss-of-offsite power event at Oconee. Although the new hardware (degraded voltage protection), which you have installed to support the use of the Central Switchyard, does not completely meet the guidance contained in various applicable staff documents, it does provide a positive measure of protection against inadequate voltage when the Central Switchyard is utilized.
It is the staff's position that the proposed use of the Central Switchyard as an offsite power source would require technical specifications meeting the guidelines contained in the NRC Generic Letter (GL) dated June 2, 1977.
Proposed technical specifications covering the use of the Central Switchyard are being reviewed by NRC staff as part of the revision of the Oconee Electrical Technical Specifications. In order to allow interim use of the Central Switchyard while the electrical technical specification change is processed, you were requested to commit to administrative controls and testing equivalent to the technical specifications recommended in the GL. In letters dated November 30, 1993, and January 24, 1994, you provided a description of the controls and testing that would be performed. We have reviewed your 90360263 40307
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Mr. J. W. Hampton
- 2 submittals and find them acceptable. Therefore, we conclude that the use of the Central Switchyard as an offsite power source under the administrative controls described in your submittals, is acceptable for the interim period until appropriate technical specifications are approved to cover this use.
The use of the Central Switchyard to satisfy existing Technical Specification Limiting Conditions of Operation requirements is not acceptable without prior approval of technical specification changes.
If you have any questions regarding this matter, contact me at (301) 504-1495.
Sincerely, Original signed by:
Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTION NRC & Local PDRs PD23 Reading File S. Varga G. Lainas C. Berlinger D. Matthews L. Wiens L. Berry OGC ACRS (10)
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/7/94 Document Name: G:\\OCONEE\\0C086233.LTR
Mr. J. W. Hampton 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. Mark Lesser, Section 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 34619-1035 Mr. G. A. Copp Licensing -
ECO50 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 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 Atlanta, Georgia 30323 Max Batavia, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Supervisor of Oconee County Walhalla, South Carolina 29621