ML19291C034
| ML19291C034 | |
| Person / Time | |
|---|---|
| Issue date: | 11/16/1979 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Gammill W, Vollmer R Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR NUDOCS 8001110085 | |
| Download: ML19291C034 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION y
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WASHINGTON, D. C. 20555 NOV 161979 MEMORANDUM FOR: William P. Gammill, Acting Assistant Director for J ', e.
Operating Reactor Projects, D0R Richard H. Vollmer, Acting Assistant Director for Systematic Evaluation Program, D0R FROM:
Darrell G. Eisenhut, Acting Director, Division of Operating Reactors
SUBJECT:
LOSS OF OFFSITE POWER SURVEY Our previous memo dated August 20, 1979, relating to loss of offsite power survey requested a survey of offsite power experience for certain plants that had reported either total or partial interrup-tions of offsite power.
These plants were identified as a result of their LER's.
Since that time we have determined that this survey should include all plants since there may be cases where similar experiences may not have been reported.
This information is a necessary part of iask Actior. Plan A-44, Station Blackout, which has a high priority. Therefore, the attached questions and sample letter should be sent to the remaining licensees who have not be previously contacted.
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Darrell G. Eisen ut, Acting Director Division of Operating Reactors Enclosures :
1.
Sample Letter 2.
Loss of Offsite Power Survey - questions cc w/ enclosures:
See next page 1734 2b}
Contact:
M. Chiramal, X28333 9001110 085
William P. Gamill 2-NOV 161979 Richard H. Vollmer cc w/ enclosures:
D. Ficonhut 6 Hanau D b.
Ld illdh F. Rosa D. Tondi I. Ahmed P. Baranowsky M. Chiramal OR Branch Chiefs 1734 202
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SAMPLE LETTER Docket No. 50-Licensee Address Dear Mr.
RE:
NUCLEARPOWERSTATION(UNIT (S)
)
We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particulTr, 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 been sent to us.
Our records do not indicate that you have experienced any loss of offsite power events either completely or partially.
Please review your experiences ano, 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 (fill in name of plant ) Nuclear Power Plant to us within 90 days of the receipt of this letter,
, Chief Operating Reactors Branch #
Division of Operating Reactors Enclos ure:
Request for Additional InforTnation 1734 263
Enclosure LOSS OF 0FFSITE POWER SURVEY
- A.
For losses of offsite power where less than all offsite power was lost:*
1.
How many circuits to the offsite network are normally available
- 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, voltages reached, affects, etc.
5.
Was any frequency decay experienced just prior 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 long 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 detials, voltages reached, affects, etc.
5.
Was any frequency decay experienced just 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.
I734 264
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