ML20113D719
| ML20113D719 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 01/18/1985 |
| From: | George Alexander COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 9651N, GL-84-15, NUDOCS 8501230203 | |
| Download: ML20113D719 (4) | |
Text
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N Commonwealth E:Cson v
) one First Nr.tionti Pint, Chictgo. Illinois I
/
O' (C'
Addr;ss Riply to: Post Office Box 767 N
Chicago, Illinois 60690 January 18, 1985 Mr..Harol'd R. Denton, Director Office of Nuclear Reactor Regulation
-U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Quad Cities Station Units 1 and 2 Corrected Response to Generic Letter No. 84-15 NRC Docket Nos. 50-254/265 References (a):
Generic Letter 84 D. G. Eisenhut letter to All OLs and cps dated July 2, 1984 (b):
September 28, 1984 G. L. Alexander letter to H. R. Denton (c):
October 12, 1984 G. L. Alexander letter to H. R. Denton
Dear Mr. Denton:
Reference-(c) contained our response to Generic Letter No.
84-15 for Quad Cities Station.
Pages 2 and 3 of the attachment to the letter contained typographical errors under the "Date" heading.
Attached are revised pages with the corrected information.
Please address.any questions that you or your staff may have concerning our response to this office.
One signed original with Attachment and fifteen copies are
'being~provided for your use.
spectfully, Greg lexa der f
Attachment _
Nuclear Licensing Administrator cc:
RIII Inspector - QC 9651N' 90 l%ss 8501230203 850118 i
PDR ADOCK 05000254
. P_
ATTACHMENT QUAD CITIES UNITS 1 AND 2 COMMONWEALTH EDISON COMPANY 1.
Reduction in Number of Cold Fast Start Surveillance Tests Electro-Motive Division diesel engine models 20-645E4 and 20-645E4B supplied by Western Engine are utilized as the emergency diesel generators at Quad Cities Station.
These models are 20 cyclinder, 45 degree Vee, two-stroke cycle, turbocharged diesel engines, providing a piston displacement of 645 cubic inches.
A review of the engine operating inanual and conversations with the Western Engine service representatives have indicated that fast cold starts should be avoided whenever possible and practical.
Both agree that minimization of fast cold starts would significantly reduce engine wear and ultimately improve diesel _ generator reliability and life expectancy.
Although the soak back oil pump circulates heated lubricating oil through the diesel engine during shutdown, the operating-manual and service representatives recommended a
. minimum engine " warm-up" period of 90 seconds.
This warm-up entails starting the diesel and operating _it at the specified idle speed'of 400 rpm.
Subsequent to the warm-up period, the deisel' generator may be accelerated to the ratea operating speed or 900 rpm and loaded to a minimum of.40 percent of_the rated load.. This ensures that proper bearing lubrication is taking
' place.and minimizes thermal stresses on engine components.
To reduce-the actual number of diesel generator starts, the Technical Specifications that require operability testing of the diesel generators for inoperable equipment will be deleted via Technical-Specification change. ;However, the Station procedures will retain verification of diesel' generator status for availability even-after the Technical Specification change
-(i.e., no associated equipment out of service, diesel generator control switch in "AUT0", etc.').
- Although the number of required diesel generator starts will'be reduced, fast cold start capability testing will.not be totally climinated.- Technical Specification 4.9.E.2.a and 4.9.E.b, which require' simulated emergency auto-starts of diesel
. generators,~'will remain unchanged.
-To' reduce excessive engine' wear,.surveillances which require routine ~ diesel generator operabilityLtesting-(i.e.
monthly operability-and/or' post-maintenance surveillance) will' incorporate the 90 second warm-up period into the surveillance J
n-t.
3;
. procedure.
All other requirements of the survellance will
. remain unchanged..This will sufficiently demonstrate the diesel (generator's ability to start and load.
2 ~. - Diesel Generator Reliability Data Diesel generator reliability data were obtained in accordance with the recommendations of Regulatory Guide 1.108
.- po sitio n ' C. 2. e.
The primary source of the data was the Unit Operating Log Books, with Deviation Reports and Surveillance JChecksheets utilized as secondary sources.
Although no independent record is maintained of diesel generator ~ starts and failures, the combination of Unit Operating Log Book entries, Deviation Reports, and Surveillances clearly
-identify diesel generator starts, run times, and failures.
These may_be utilized as a record of diesel generator reliability. data information.
The following is a summary of diesel generator demands and
-failures for the 20 and 100 demands criteria, with a time history for.the associated failure.
Diesel Generator 1-Failurestin.last 20-starts = 4~
Failures in last 100 starts = 5 Diesel-Generator reliability = 95%
FAILURE 1
- DURATION DATE-Failure 1-20-min.
07-29-84 e Failure 2 20 min.
06-07-84 j
- Failure 3-11 hr. 10. min.
06-12-84
" Failure 4 11 hr. 5 min.
~04-28-84 s
b
' Failure 5-3 hr.-11 min. :12-15-82 REVISED l-17-85 4
a t
bi e
x;
- s. e y Diesel-Generator-1/2 Fai!
escin last~20 starts = 2 Failures inflast-100 starts = 3
~ Diesel Generator reliability = 97%
FAILUREL DURATION DATE' Failure 1 20 min.
07-28-84 Failure 2 41 hr. 20 min. 07-28-84 Failure 3
~1 min.
02-02-83 s
Diesel Generator 2 Failures in last 20 starts = 0
- Failures in last:100' starts = 4
' Diesel ~ Generator reliability = 96%
FAILURE DURATION
'DATE-
~ Failure 1
'28 hr. 42' min. 10-06-82
' Failure 2' 20 hr.
10-30-81~
Failure 3?
3 hr.
10-26-81 Failure 4 L43 hr. 40 min.:10-26 '
is 3.
. Diesel' Generator: Reliability Monthly! maintenance: performed on the diesel generator-
' coupled.with surveillance? esting of.the-diesel ~ generators!has t
Lyieldedireliability ratings 1of 95% to 97%.
It is' felt ~that
- maintaining-the present program of: monthly. maintenance,;along.
'with implementing the changes noted in.section 1, provide for-Ldiesel gnerator reliability consistent;with safe-plant operation.
REVISED l-17,
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