ML19323E401
| ML19323E401 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/06/1980 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Peoples D COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8005230500 | |
| Download: ML19323E401 (3) | |
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':r. D. Louis Peoples Directcr of t!uclear Licensing Cc~ nwealth Edison Ccapany P:st Office Sox 757 Chicap, Illinois 50590 i
Dear !:
- r. Peoples :
RE: ZI.'? STATIO:1, 'JiiIT NOS.1 A!iD 2 We are currently revieviing the adequacy of the offsite power systems i
of r.uclear power plants and in particular, the loss of offsite power events at your facilities. One aspect of this review concerns the hhtery of experienced total and partial p;wer outages and attendent degraded voltage or frequency conditions of the grid.
j In cur reviau of this catter we have drawn upon the information j
trovided to us' via Licensee Event Reports and follcwup letters which j
have 'een sent to us.
Our records do not indicate that you have exper-t
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isnced any loss of offsite po:cer events either completely or partially.
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Please review your exa:rienc2s and, if any are identified, then report t'.e-in ansNer to this letter and furnish the related informatien as included in the enclosure, Pleise rovi.'e your response to us within 30 days of the receipt of i
this letter.
1 Sincerely, nh
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Division of Licensing i
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Enclosure:
F.scu n-for Additional Infarm tie n -
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'1/ i30lo s ur e THIS DOCUMENT CONTAINS e ee next sage P0OR QUAUTY PAGES d
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- 3. Lc'lis Pccplas
- c.cr.cealth Ediscn Ccmpany s
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..ciien, ~csquire cc:
109 Her;h Daarborn Street Chica ;c, I'.li r.oi s 60602 Dr. Cecil Lue-Hing Directcr of Rece2rch and Develcpment
- M:repolitan Sanitary Cistrict of Greiter Chicaco 100 East Erie Strect Chicace, Illinois 6CS11 Ilon-?enten Public Library District 2500 Emasus Aver.ce Zica, Illir.cis 6CC99 cr. en1111p r,.
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! sham, Linccin and Beale Ccunselors at Law One First National Plaza 42nd Flocr Chicago, Illinois 6C603 Susan N. Sekuler, Esquire Assistant Attorney General Environmantal Centroi Divisica 133 Ecst Randolph Streat, Suite 2315 Chicago, Illinois 6C501 U. S. Nuclear Reculatcry Ccamissicn Resident Insnectors Office
? cst Of fice Box 238 Cearfield, Illir.cis 6C015 l
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LOSS OF OFFSITE POWER SURVEY *_
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l 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 and how many were lost during the event?
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' 2.
What was the cause of the event?
3.- Why db the other lines not fail when some did fail?
l.4. 'Was any voltage in' crease or decrease experienced just. prior to or during the outhge?. If so, please give details, voltages
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reached, affects, etc. -
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- ~ ".. ' 5.~ Was any frequency decay experienced just prior to or during the
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' outage? 'If so, ~please give details, lowest frequency reached,
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- decay rate, affects on equipment operation, etc..',
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How long was poder 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.
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