ML17252A454
| ML17252A454 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/18/1978 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| LER 01X-0 | |
| Download: ML17252A454 (3) | |
Text
Comm§.ealth Edison Dresden Ni:..ciear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr; #78-1030 James G. Keppler, Regional Directo~
July 14, 197 8 Directorate of Regulatory O~erations*- Region III u~s. Nuclear Regulatory Connnission 799 Roosevelt.. Road Glen Ellyn, IL 60137 r.:;
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Reportable ?ccurrence Report ;.f/77..,.059/0lX-l, Do<;_~et-1!?~4_9J.~.~ __.. _
hereby submit.ted to your office to supplement ~,License~ E.'\\l:~n*t. ~~p_gr.t 77-059/01 T-0 concerning the. Unit 3.Diesd G.enerator Feed Breaker to Bus 34-1 pulled tollock~ It addresses the.cdrrective actions implemented to prevent a recurrence.
This event was reported to you under Dresden Nuclear Power Station Technical Specification
- 6. 6.B.1. (f), personnel error or procedural.inadequacy which prevents or could.prevent, *by itself, the *fulfillment of.the functional requirements of systems required to cope with accidents analyzed in the SAR.
Power Station BBS/lanh Enclosure CC:
Director 6f Inspection & Enforcement
.D.ir.ector of Management Information & Program Control File/NRC JUL l-81979 F-tL£ 1"*
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I While Unit 3 was at steady-state operation, 2/3 diesel was taken out of seryice for inspection.
However,. the operator mistakenly pulled the U3 D/G to Bus 34-1 switch to lock and placed **the out-of-service card there, thus making the U3 D/G inoperable in that the feedbreaker would not close in case of loss of offsite power.
The mistake C2:IIJ was discovered and corrected in three hours and in this period offsite power was
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[J))] I Mistake was promptly corrected and operator was instructed of the. error. Operating ITIIJ personnel have been made aware of the importance of avoiding operating* errors.
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Shift starting times have been moved up ~ hr.
In addition, the station will continue DJ:TI*
the policy of independently verifying all safety related equipment outages.
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a ATTACHMENT TO LICENSEE EVENT REPORT 77-059/0lX...:.l COMMONWEALTH EDISON COMPANY (CWE)
DRESDEN UNIT 3 (ILDRS-3)
DOCKET # 050-249 At 054S. on December.28, 1977, while Unit 3 was at steady-state operation, the Unit 2/3 diesel generator was taken out of service for a monthly maintenance inspection; The diesel was taken out of service locally, and the 2/3 D/G to Bus 33-1 feed breaker was racked out.
However, the operator in 'the Control Room mistakenly put the out-of-service card on the 3 D/G to Bus 34~1 breaker switch and placed that switch in the pull to lock position.
In doing this the 3 D/G was made inoperable because in the event of a loss of offsite power, the diesel would not auto close to Bus 34-1.
The mistake was discovered at 0850 on the same date and was immediately corrected.
In the 3-hour period Unit 3 diesel generator was inoperable~-*
. off-site power was available.:-
In additiori the Unit 3 diesel could have been r~turned ~o operation by placing the breaker control switch (to Bus 34-1) to the normal position had *offsite power been lost, because the feed.breaker was'not racked out.
This is not a repetitive event.
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Immediately after discovery of the mistake, proper corrective action was taken.
The operator was instructed of the error.
All *diesel gener-ator switches in the control room have been*color coded to identify different diesel generators.
Through the company Profess~onalism Program, the Station has made operating personnel aware of the importance of avoiding operating errors. Shift.starting times have been moved up ~hour to enable.the control room operators to conduct a more thorough operational walk down of their control boards before the peak periods of surveillance and maintenance related work.
Additionally, the station will. continue to use double independent. verification to ensure the proper removal and return to service of safety*
related and.techriical specification related equipment.
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