ML20049J912
| ML20049J912 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/25/1982 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 3731N, NUDOCS 8203290208 | |
| Download: ML20049J912 (4) | |
Text
_
Commonwealth Edison O ) one First Nabonal Plata. Chicago, llhnors O
Address Reply to: Post Office Box 767 Chicago, lihnois 60690 March 25, 1982 4
g RECEivi?g Mr. A. Schwerice r, Chie f i}
MAR g 619828-I-Licensing Branch #2 6
"W;3fra[ Q M C es 4
Division o f Licensing U. S. Nuclear Regulatory Commission L*
Washington, DC 20555 N
0%
Subject:
LaSalle County Stttion Units 1 and 2 Diesel Generator Starts NRC Docket Nos. 50-373 and 50-374
Dear Mr. Schwencer:
The purpose of this letter is to transmit information on the number of diesel generator starts at LaSalle County Station.
This information was requested during a telecon between representa-tives of Commonwealth Edison Company and Dr.
A. Bournia, et al, o f your staf f on March 18, 1982.
Attached p' lease fino a summary o f starts and f ailures encountered for each of diesel generators 0, lA, 18 and 2A since their r.espective 23 start test.
It should be noted that not all starts are classified as either " Valid Starts" or " Failures".
In cases where a Regulatory Guide 1.108 start (which requires I hour run time) was not being performed (such as for preoperational testing), the start has not been classified as a Valid Test.
This info.mation was compiled through an extensive survey o f information from several sources at the station.
While there was an attempt at completeness, there exists a possibility that a small number of starts may not be included in these summaries.
Between January 23, and March 4, 1982, all four diesel generators were released to operations and monthly surveillances were officially initiated.
The surveillances performed for each diesel generator since release to operation have indicated no failures.
Commonwealth Edison Company intends to comply with Technical Specification Table 4.8.1.1.2-1, Diesel Generator Test Schedule.
This table presently requires that "For the purposes o f this test schedule, only valid tests conducted after the OL issuance date shall be included in the computation of the "last 100 valid tests."
pgRADOCK03290208 820325 03000373 A
A. Schwencer March 25, 1982 If there are any further questions in this matter, please contact this office.
Very truly yours, 3)19)
- C.
W. Schroeder Nuclear Licensing Adminis trator 1m Attachment cc:
NRC Resident Inspector - LSCS 3731N
\\
,s Division 1 - Diesel Generatof "O'
ODG0]K R.G. 1.108 "23 Start Test completed 9/05/80 97 st' arts since 9/05/1}0 55 were for pre-op testing / retesting 20 were related to maintenance testing 22.were' operating training / machinery exercise or unknown.
Of the 97 starts, 'there were 20 that qualified as " valid tests"
)
, per R.G. 1.108 and two " failures".
Failure #1 -
6-24-81
.DG-0 Cooling Water Pump would not auto start, motor had to be rebuilt.
Cause o f failure - unknown.
Failure #2 28-81 DG-0 failure to auto start" on a simulated ECCS actuation signal.
A
~
manual remote start one minute later
',as acceptable.
ECCS act. test w
reported 2-15-82 and. was accepted.
A'ppardntly dirty contacts in ECCS at circuit.
All preven.
firs t 6 years was comp,leted' Nobe'mber 24,tative maintenance and 1981.
Monthly surveil-lance o f ficially started.1-23-82,* and t wo have been done to date and dre two of thb 20 valid tests above.
c Division 2 - Diesel G'enerator lAl IOGO$K H.G. l'.108 23 start tests en'ded 6-29-79.
^
163 starts since 6-29-79 93 st. arts were.for preoperational t e5 ting /r e t e s t'ing 24 starts were maint. related testing 46 starts were Operator training /
ma,chinery exe rcise o r. unknown.
Of the 163 starts, there were 3 "f ai urss" and 42 " valid tests" as defined by R.G.
1.108.
Failure #1 DG-1 A would -not start on 9/11/79.
No information on cause or corrective work.
Reason for test -
unknown.
Could be an invalid test and not a failure.
l Failure #2
[
DG-1 A would not start on 1-25-80, 1-26-80, and 2-14-80, due to one missing and one broken i
blocking diode.
No t all o f the original damage l
was found by troubleshooting until af ter the l
2-14-80 start attempt.
No starts or start attempts occurred between the first and last startup a ttempts (on 1/25 and 2/14).
Co rrec tive action to prevent recurrence was done to check l
all blocking diodes periodically.
,= s Failure #3 New relay tach failed af ter one run o f DG-1A preventing DG-1 A s tart on 11/22/81.
Due to defective conpensation circuit board, relay tach replaced and no problems have occurred since.
All preventative maintenance and overhaul work required for the first 6 years was completed on November 20, 1981.
Monthly surv.
officially started 1-24-82, and three have been completed to date and are 3 o f the 42 valid tests above.
Division 3 - Diesel Generator 1B, 1E22-S001 R.G. 1.108 23 start tests ended 1-05-81 79 starts since 1-05-81 40 starts were preop related 24 starts were maint. related 15 starts were operator training /
machinery exercise or unknown Of the 79 starts, there were 1 "f ailure" and 11 " valid tests" as de fined by R.G.
1.108.
Failure #1 was caused by a stripped adjustment screw on the DG-1B governor run solenoid.
This caused 2 start f ailures and 1 trip during engine operation.
All preventative maintenance and overhaul work required for the first 6 years was completed October 26, 1981.
Monthly survell-lance of ficially started with surv. on 3-4-82, and is one of the 11 valid tests above.
Divison 2, Unit 2 - Diesel Generato r 2 A, 2DG01K R.G. 1.108 23 start tests ended 5-22-81.
49 starts since 5-22-81 32 starts were preop related 7 starts were maint. related 10 starts were operator training /
machinery exercise or unknown Of the 49 starts, there were 6 " valid tests" and no "f ailures".
All preventative maintenance and overhaul work required for the first 6 years was completed on December 17, 1981.
O f ficial monthly operating surveillances were begun on 2-26-82 and only the initial surv. has been done to date (3-23-82) and is included as one of the 6 valid test above.
3731N