ML20034B996
| ML20034B996 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 04/19/1990 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20034B994 | List: |
| References | |
| NUDOCS 9005010280 | |
| Download: ML20034B996 (1) | |
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.U.S. Nuclear Regulatory Commission A'i N.
,,...,4 ATTN:l Document' Control Desk x
y April 19,.1990 j
Attachment k
s 3
Duke, Power Company 1
McGuire Nuclean Station-C
[
Diesel Generator 1A Spacial Report 1
On March 3, 1990 at-2031, Diesel Generator (DG)-1A failed'to start during V(b[
Start Attempt No.'781.-
Work request no.' 140801 was= initiated to' investigate.
the cause o hthe failure. :At 2146, Start Attempt.No. 782 was made to:
. troubleshoot the previous failure. 'Again,Lthe engine did npt start and the^
a cause was-determined to be a failuru of the cooling! water high temperature :
switch (1KDTS5100). Since this trip skitch-is'by-passed in'the emergency mode-of. operation. Start Attempt No. 781/is considered :an:Inval1d Test '
Failure. Start Attempt No. 782~was an~1nvalid Test Attempt for:
. troubleshooting. Start Attempt No. 783.was made with 1KDTS5100 by passed-to '
allow performance testing (PT/3/A/4350/15A, DG 18 Month Test) while the-
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switch was being replaced. The oughie' started successfully..This test is considered invalid because-the run was terminated intentionally without:
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s loading the DG.
Temperature switch 1KDTS5100 was replaced and. Start Attempt No. 184 was performed satisfactorily. LThis s*s-t attempt?is alsoLan Invalid V
Test because the DG was~ intentionally not loaded..
4 On March 4, 1990 at 0929,-Start Attempt No. 785 was hade, but the DG failed' to start. Approximately 4 seconds later, Start Attempt-No. 786 was-made.
resulting in a successful start. This start is considernd an' InvalM Test.-
because the DG was not loaded to 50% load. Work request no'. 75312 was-j initiated to investigate the failure. The cause of-the failure was due to O
loose sliding links at terminations C33 and E33. The nuts on the back off j
the links were found to have stripped threads. -The nuts were replaced.
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H Start Attempt No._785 is considered an Invalid Test Failure'because'both of y'
these links are by passed in the emergency mode of operation.
.On, March 4,.
j 1990 at 0945, Start Attempt No. 787 was made and performed satisfactorily-Both of the aforementioned Invalid Test Failures are considered'to be random
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and due to normal equipment wear. Neither failure would have affected DG
- s optration in an emergency since they were by-passed in the-start circuit; i
therefore, no corrective actie.s are deemed necessary at this time.
q DG 1A has experienced 1 Valid Failure in the last 20 Valid Tests and 3 Valid
Failures,in'the last 100 Valid Tests.
Surveillance test frequency la.
monthly. On'a unit basis, there have been 5 Valid Failures in the last 100 l
Valid Tests.
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