ML19260C678
| ML19260C678 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 12/13/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8001080294 | |
| Download: ML19260C678 (3) | |
Text
.~g g[e Mc h UNITED STATES n
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i NUCLEAR REGULATORY COMMISSION
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.a E WASHINGTON, D. C. 20555
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DECEYBER 1 3 1979 Occket Nos. 50-259, 50-260 and 50-296 fir. Hugh G. Parris Manager of Power
' Tennessee Valley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37401
Dear Mr. Parris:
We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particular, the loss of offsite power events at your facility. One aspect of this review concerns the history of experienced total and partial power outages and attendent degraded voltage or frequency conditions of the grid.
In our review of this matter we have drawn upon the information provided to us via Licensee Event Reports and followup letters which have bnn sent to Our records do not indicate that you have experienced any loss of us.
offsite power events either completely or partially. Please review your experiences and, if any are identified, then report them in answer to this letter and furnish the related information as included in the enclosure.
Please provide your response for the Browns Ferry Plant Units Nos.1, 2 and 3, to us within 90 days of the receipt of this letter.
Si ncerely,
. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
P.equest for Additional Information 1702 312 8001080 2
P
Mr. Hugh G. Parris Tennessee Valley !.uthority
-2 cc:
H. S. Sanger, Jr., Esquire General Counsel Tennessee Valley Authority 400 Commerce Avenue E 11B 33 C Knoxville, Tennessee 37902 Mr. ' Dennis McCloud Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. E. G. Beasley Tennessee Valley Authority 400 Commerce Avenue W 10C 131C Knoxville, Tennessee 37902 Robert F. Sullivan U. S. Nuclear Regulatory Commission P. O. Box 1863 Decatur, Alabama 35602 Athens Public Library South and Forrest Athens, Alabama 35611 1702 313
s e
RE00EST FOR ADDITION.11 If FOPy.' TION A.
For losses of offsite power where less than all effsite power was lost:
1.
How many circuits to the offsite network are norrally available and how many were lost during the event?
2.
What was the cause of the event?
- 3. ' Why did the other lines not fail when some did fail?
4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give details, vol: ages reached, affects, etc.
5.
Was any frequency decay experienced just pricr to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
How long was power unavailable from the circuit?
7.
Date of Event.
B.
For losses of all offsite power:
1.
How long was the power off? How lor.g for partial recovery? Please give details.
2.
If turbine trip occurred, how soon after did loss of offsite power occur?
3.
If power was recovered promptly (10 minutes or less), was it due to automatic or manual actions?
4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give details, voitages reached, affecti-etc, 5.
Was any frequency decay experienced jus: prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.' Date of Event.
C.
Were there any other loss of offsite peser ever.:s c:her than we have listed?
If so, please give details of each ever.:.
!792 714