ML20034B311
| ML20034B311 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 04/17/1990 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9004260380 | |
| Download: ML20034B311 (2) | |
Text
w-
-ll:,
-#L Duke 1%er Company :
- Het E kner L
- P.0 Bar 33198.
Vice Presiden:
Charlotte, NC 28242 Nudear hodaction (TN)3734S31
- DUKE POWER April 17, 1990-U.S. Nuclear Regulatory Commission-ATTN: Document Control' Desk-Washington, D C.
20555
~
Subject:
~McGuire Nuclear Station, Unit 1, Docket No. 50-369 Revision to'Special' Report Concerning Diesel Generator 1A~
Gentlemen:
By letter dated April-2, 1990, pursuant to Technical Specification (TS) 6.9.2 as specified by TS 4.8.1.1.3, a special report concerning Diesel
' Generator 1A was submitted. The attached revision is.provided to correct a typographical error. The revision-is identific'd by change bars.
If there are any questions, please contact Steve-LeRoy at'704-373-6233.
Very truly yours, ng Hal B. Tucker Attachment SEL530 xc:
Mr. S.D. Ebneter, Administrator U. S. Nuclear Regulatory Commission, Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. D.S. Hood, Project Manager Office of Nuclear Reactor Regulation, USNRC Washington, D.C.
20555 Mr. P.K. Van Doorn Senior Resident Inspector, USNRC McGuire Nuclear Station dhhhd[69 1
$f I
PDC Q
/
w.;
', i U.S. Nuc1 car Rrgulctory Commicaion
. ATTN: Document Control Desk April 17, 1990
' Attachment Duke Power Company l
McGuire Nuclear Station l
Diesel Generator.1A Special' Report On March 3, 1990 at 2031, Diesel Generator (DG) 1A failed.to start during
~
~
Start _ Attempt No. 781. Work request no. 140801 was initiated to investigate-the cause of the failure.
At'2146, Start Attempt No. 782 was made to troubleshoot the previous failure.. Again, the engine did not start and-the--
j cause was determined to be a failure of the cooling water high temperature
~
switch-(1KDTS5100). Since this trip switch is by passed'in the~ emergency.
mode of operation, Start' Attempt No. 781 is considered an Invalid Test j
Failure. Start Attempt No. 782 was an Invalid Test Attempt'for i
troubleshooting. Start' Attempt No. 783'was made with 1KDTS5100 by passed to allow performance testing (PT/1/A/4350, DG 18 Month Test) while the switch-was being replaced. The engine started successfully..This test is considered invalid because the run was terminated intentionally without loading the DG.
Temperature-switch 1KDTS5100.was replaced and Start Attempt-No. 784 was performed satisfactorily. This start attempt is also an Invalid Test because the DG was intentionally not loaded.
On March 4, 1990 at 0929, Start Attempt No. 785 was made, but the.DG ' failed to start. Approximately 4 seconds later, Start Attempt No. 786 was made resulting in a succ.essful start. This start is considered an Invalid Test because the DG was not loaded to 50% load. Work request.no. 75312 was initiated to investigate the failure. The cause of the failure was due to loose sliding links at terminations C33 and E33. The nuts on the back of 1
the links were found to have stripped threads. The nuts were replaced..
Start Attempt No. 786 is considered an Invalid Test Failure because both of 1
these links are by passed in the emergency mode'of operation. On March 4, 1990 at 0845, Start Attempt No.-787 was made and performed satisfactorily.
l Both of the aforementioned Invalid Test Failures are considered to be random and due to normal equipment wear. Neither failure would have affected DG
]
operation in an emergency since they were by passed in the start circuit; i
therefore, no corrective actions are deemed necessary at.this time.
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 is monthly. On a unit basis, there have been 5 Valid Failures in the last 100 lf -
Valid Tests.
}
.l 4
1 fL
]