ML20009C824
| ML20009C824 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/03/1978 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20009C822 | List: |
| References | |
| NUDOCS 8107220019 | |
| Download: ML20009C824 (15) | |
Text
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Enclosura 3 DE '.
PHILAD ELPHIA ELECTRIC COM PANY i.C
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February 3, 1978 Docket Nos. 50-277 50-278 Director Nucleap Reactor Regulation U.S. Nuclear Regulatory Comission Washington, Oc 20555
Dear Sir:
Attached is Our respense to the questionnaire en reliability _
of standby diesel generator units, which was requested in Mr. Kari R..-
Goller's letter of December 15, 1977 Afso attached are the maintenance precedures requested en page 15 of the questionnaire and the surveillance test precedures requesteo on page 21.
Should you have any questions or recuire further infer.ation, please do' not hesitate to centact us.
Very truly ycurs, Attachment N
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- C10722OO19 810709
/[f PDR ADOCK 05000277 F
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-5.
Are any foreien cases such as propane, freon, halon, carbon dioxide, etc. stored in the: Diesel Engine room?
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Yes No y
or adjacent buildings? 'Yes x - 30 If yes,-(other than hand portable fire pxtinguishers),> then i
identify. gases and give approximate *.a'nk size.
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Gases co, Volump ( f t")
97 T.
Does control system autcmatically bypass, in emergency starting, any engine temporarily out of service for maintenance? Yes No X
System manually blocked for =aintenance If yes, then how many failures to bypass have occured?
U.
Does the control system automatically override the test.
mode under emergency conditions? Yes N/A No No test positic, V. LHave repetitive mechanical 'f ailures occ'urred in any ccmoonent part or subsystem of the engine, generator, or switch aear. etc.?
Yes x
Ho if yes, then which part or subsystem?
Valves in air start seste=
How many failures?
About 30 Give nature of failure.
Seat or stem failures. leaks through.
W.
would periodic (yearly or ~other) evaluation and/or testing by "outside excerts" contribute significantly to the ciesel.-
generator reliability? Yes No x
Give brief reasons for the answer. Philadelph_ia,Electri:
Company's operating and maintenance. groups have. attained knowledge
in the area of operation. testine, inseection and a-se-euch
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1.
Give the accumulated time-load operating record for each diesel-generator unit from installation tu the present (Running Hours):
'Preoperational test Date July 1973
- Engine Sury. Testing & :
- Emergency Total
- Serial Ho :
Maintenance Mrs. :
and Other Hours :
No Load : Loaded. : Service Hrs. :
- JounsVUL) ;
DSM12
- - 100 300 178 573
- 38D87018 DSM12 100 300 591 991 38D87010 DSM12 100 300 197 597
- Jeociuzz 566 DSN12 100 300 166 "Approximace 2.
Surveillance test load (percent of continucus rating) 8 07.
of normal ' raced load of 2.5Mw 3.
Give the projected or olanned time-load operation for each diesel-generator unit during the next 12 months.
- Surveillance &
Emergency :
Tota 1
- Maintenance Mrs. :
and other :
Leurs
- Service Hrs. :
, 70.
30 100 l
4 Provide the following sunmary of the periodic urvelliance testing experience:
a.
Starting date of surveillance testing (OL a.'te)
Aur. 1973 b.
Periodic test interval' Ueakly c.
Total numoer of surveillance tests performed c 1000 a
(see Additional co==ents) d.
Total -number of test, failures f ailure to start i
f ailure to accent load 2
f ailure to carry loao f ailures cue to coeratnr errnr i
failure due to ecuionent not being operative caring emergency conditions ~
e.
Supply a copy of the surveillance test procedur es with tnis ccmoleted cuestionnaire.
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Additional Comments
' Breakdown of Tese fat tures r.
- 1. Failure to Scare - Dire or foreign material interfered with field flashing logic relays
- 2. Failure to accent load - D.G. breaker inocerable(charging
.w-spring.not charged due to charging motor ' brush wear,)
- 3. Failure to accept load -[hilure of D.G. breaker to close due to bent linkage.
/*. Ooerstor errer - D.C. Control to -.achine le ft ocen.
Y.
General Succestions-Briefly give constructive criticism or suggestions as to These improvement in reliacility of the diesel generstors.
remarks may cover tests, maintenance, oractices, orcers,
- olicy, adjustments, etc.
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