ML18029A674
| ML18029A674 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/27/1985 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML18029A675 | List: |
| References | |
| NUDOCS 8507160727 | |
| Download: ML18029A674 (5) | |
Text
June 27, 1985 Docket Nos. 50-259/260/296 Mr. Hugh G. Parris Manager of Power Tennessee Yalley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37401
Dear Mr. Parris:
SUBJECT:
REACTOR PROTECTION SYSTEM (RPS)
POWER MONITORING SYSTEM DESIGN MODIFICATION Re:
Browns Ferry Nuclear Plant, Units 1, 2 and 3
The RPS power supply modification was initiated by our letter to you of August 7, 1978.
We required that the RPS components shall not be exposed to unacceptable voltage and frequency variations in the electric power which could damage the components.
You were, therefore, required to provide modifications which permit automatic detection of and protection against abnormal voltages and frequencies, and provide for isolation of electric power.
The modifications were to meet Class 1E requirements of IEEE 279, single failure protection requirements of General Design Criterion (GDC) 21, and seismic requirements of GDC 2.
You were also required to submit Technical Specification changes including limiting conditions for operation, surveillance requirements and trip setpoints.
Over the intervening years, design and implementation of the modifications have been the subject of periodic correspondence and conference calls, the most recent of which was your response of March 1, 1985 to one of our Requests for Additional Information.
We have reviewed your submittals including the additional information provided in your March 1, 1985 submittal.
Our review concludes that (1) the proposed modification and the relay setpoints which are to be incorporated in the Technical Specifications will adequately protect the RPS electrical components from sustained abnormal voltage and frequency conditions of the power supplies; and (2) during the interim period until the modifications are installed, the 110 volt coils of the scram contactors are replaced, and the testing is completed; the continued monitoring of the, RPS power supply, in accordance with our letter to you of August 7, 1978 will assure protection of the RPS components from an undetected abnormal voltage and frequency.
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Mr. Hugh G. Parris Based on our review of your design modifications and the actions you have committed to take, we conclude that the generic issue of Monitoring of Electric Power to the RPS is satisfactorily resolved for Browns Ferry, Units 1, 2 and 3.
Sincerely, Original signed by/
Enclosure:
As stated cc w/enclosure:
See next page DISTRIBUTION NRC PDR Local PDR ORBP2 Reading HThompson OELD SNorris RClark WLong ELJordan JPartlow BGrimes ACRS (10)
Gray File MThadani IAhmed J Knight Domenic B. Vassallo, Chief Operating Reactors Branch 82 Division of Licensing DL:0 B82 SNo s:ajs 06/g4/85 DL:ORB RCla 06/W/
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Mr. Hugh G. Parri s Tennessee Valley Authority Browns Ferry Nuclear Plant CC:
H. S. Sanger, Jr.,
Esquire General Counsel Tennessee Valley Authority 400 Conmerce Avenue E
11B 330 Knoxville, Tennessee 37902 Mr. Ron Rogers Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. Charles R. Christopher
- Chairman, Limestone County Commission Post Office Box 188
- Athens, Alabama 35611 Ira L. Meyers, M.D.
State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36130 Mr. H.
N. Culver 249A HBD 400 Commerce Avenue Tennessee Valley Authority Knoxville, Tennessee 37902 J.
Nelson Grace Regional Administrator Region II Office U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Steven Roessler U. S. Nuclear Regulatory Coomission Reactor Training Center Osobrne Office Center, Suite 200 Chattanooga, Tennessee 37411 James A. Coffey Site Director, BFNP'ennessee Valley Authority Post Office Box 2000
- Decatur, Alabama 35602 Resident Inspector U. S. Nuclear Regulatory Commission Route 2, Box 311
- Athens, Alabama 35611 Mr. Donald L. Williams, Jr.
Tennessee Valley Authority 400 West Summit Hill Drive, WlOB85 Knoxville, Tennessee 37902 George Jones,
- Manager, BFNP Tennessee Valley Authority Post Office Box 2000
- Decatur, Alabama 35602