ML19256E364
| ML19256E364 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/17/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Stewart W FLORIDA POWER CORP. |
| References | |
| NUDOCS 7911020227 | |
| Download: ML19256E364 (3) | |
Text
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UNITED STATES
!4 NUCLEAR REGULATORY COMMISSION
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WASHINGTON. O. C. 20555
%,, "I, f October 17, 1979 Docket "o.
50-302 fir. W. P. Stewart Manager, Nuclear Operations Florida Power Corporation P. O. Box 14042, Mail Stop C-4 St. Petersburg, Florida 33733
Dear Mr. Stewart:
'le are currently reviewing the adequacy of the offsite power systens 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 followuo letters which you have sent to us.
Our review of these reports indicated that loss of offsite power events have occurred at Crystal River Unit No. 3 on Nover.ber 28, 1977, January 4, July 10, August 2 & 16, 1978.
In order to complete our review of loss of offsite power events we require additional information. This information should be provided to us in the form of answers to the questions listed in the enclosure.
Please provide your response to the enclosed questions for the Crystal River Unit No. 3 Nuclear Power Plant to NRC within 90 days of the receipt of this
- letter, Sincerely, WY h
Robert W. Reid, Chief Operating Reactors Eranch d4 Division of Operating Reactors
Enclosure:
Recues-for Additicnal Info ation cC U/e9 Clos 9"e:
P00RORllE 1259 310 7 911020 2 y
P rig 8 ECs sr Cor; oration cc:
"r. S. A. Erancincre
' lice Presicent and General Ccur.sel P. O. Ecx 14042 St. Pe ersburg, Ficrica 33733 I'.r. Robert B. Borsum Babcock & Wilcox i;uclear Power Generation Division Suite 420, 7733 Old Georgetown Road Bethesda, Maryland 20014 Crystal River Public Library Crystal.' River, Florida 32629 Mr. Jack Shreve Office of the Public Counsel Room 4, Holland Building Tallahassee, Florida 32304 1259 311 P00RORBIEL
I ENCLOSURE PROPOSED OUESTIONS FOR LOSS OF OFF SITE SURVEY A.
Fcr icsses cf offsite poser where less than all offsite power was lost:
1.
How many circuits to the offsite network re ncrmally available and how many were lest during the event?
2.
What was the cause of the event?
Why did the other lir.es not fail when some dic fail?
3.
4 Was any voltage inr rease or decrease experisced just prier to or during the cutage? 'If sc, please give details, vc : aces reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the cutage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
How long was power unavailable from :ne circuit?
7.
Date of Event.
5.
For lesses of all offsite power:
1.
How long was the power off? How long fer partial recevery?
Please give details.
2.
If turbine trip occurred, how soon after did less of offsite power occur?
3.
If power was recovered promptly (10 minutes or less), was it due to automau:
or manual actions?
4.
Was any voltage increase or de rease experienced just prior to or during
- the. outage? If so, please give details, voltages reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the outage?
If so, please cive details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
Cate of Event.
Were there ary other icss of effsite pcwer events cther than we have lirted?
- s:, clease gi',e cetails cf eacn evert.
1259 312 P00R ORSW1