ML17192A502
| ML17192A502 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/18/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7910220316 | |
| Download: ML17192A502 (3) | |
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~ocket ORB #3 Dbcket No.
50~249 NRR Reading SEPTEMBER 1 8 1979 -
Local PDR NRC PDR Tippol ito RBevan '
Mr. Cordell* Reed Assistant ¥ice President Commonwealth Edison Company.*
P. o~. Box 767 Chicago,-Illinois 60690.
- SSheppard Atty, OELD OI&E (3)
T JCarter
,WRussell OI&E (3)'
- JRBuchana-n
- TERA.
ACRS (16)
- _Fr' bear Mr *. Reed:
. buimay DOCKET nu CD?V.**
L~e are currently reviewing *the-adequacy of*the offsite po\\'1er systems oP~
n~clea~ po0er plants and in particul~r, 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_ voltage or freq~ency condi~ions of the grid.
In our review of this matter we ha~e dra~'/n upon* the *informatfon provided
- io us via_Ucensee E~ent *Reports a~d foll?wu~ letters which you hav~
- ent to us. - Our r~v1ew of thes~ reports indicated the.loss.of offs1te to~er eventi have occurred at Oresden.Unii3 on~~gust 21, 1975~* - To complete our* review of 'loss of offsite power events we require the*
ad_ditional. infonnation co~cerning the Dresd.en Unit 3 offsite grid indicated in the enc 1 osur*e to this letter.
Please provide your response to the attached questions for Dresden Unit 3 within 90 days of rec~ipt of this Tetter. --
Enclosure:
Request for Additional Information cc w/enclosure:
Sincerely, Original Signe*i 5*
- l\\A. lppq]j,tij I -'..
Thomas A. Ippolito;Ch-ief OperatiDQ Reactors Branch 13 Division of Op~rating Reactors 3' ~--
7919220
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IOlC POllM 318 (9-76) NB.CH 0240 u.s. aOvBRNllS:~T PR~NTINQ OPP'ICB:., D71
- Ill - 711
. Mr. Cordell Reed ColTITlonwealth Edison Company cc:
Mr. John W. Rowe Isham, Lincoln & Beale Counselor~ at Law One First National Plaza, 42nd Floor
- Chicago,.Illinois 60603 Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station
- Rura 1 RoLJte #1
- Morris, Illinois 60450 Anthony Z. Reisman Natural Resources Defense Council 917 15th Street, N. W.
Washington, D. C.
20005 Morris.Public Library 604 Liberty Street Morris, Illinois 60451
- Jimmy L. Barker U. S. Nuclear Regulatory Commission P. 0. Box 706 Mor~is, Illinois
~0450 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 W. Randolph Street Suite 2315 Chicago, Illinois 60601
- SEPTrnarn T s 1979
REQUEST* FOR ADDITIONAL INFORMATION
- A.
For losses of offsite power where less than all offsite power was lost:
- l.
How many circuits to the offs He network are normally 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 detai1s, volt~ges 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 offT How long for partial recovery? Please give details.
-2. If turbine trip occurred, hew 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; 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.
s: Date of.Event.
C.
Were there any other loss of offsite power events other than we have listed?
If so, ple~se give details of eaoh eve~t.