ML20065T127

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Special Rept:On 901204,invalid Failure of Diesel Generator 2A Occurred During Air Roll Test Preceding Start Attempt for Normal Monthly Operability Performance Test Due to Removal of Safety Pin.Spacer Installed to Maintain Pin in Position
ML20065T127
Person / Time
Site: Catawba Duke Energy icon.png
Issue date: 12/20/1990
From: Tuckman M
DUKE POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9012270228
Download: ML20065T127 (2)


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.L DUKEPOWER December 20, 1990 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.

20555 Subj ect:

Catawba Nuclear Station, Unit 2 Docket No. 50-414 Special Report invalid Failure Diesel Generator 2A Pursuant to Technical Specification 4.8.1.1.3 and 6.9.2, find attached a Special Report concerning Unit 2A Diesel Generator Invalid Failure on December 4, 1990.

Very truly yours,

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M. S. Tuckman, V ce President Nuclear Operations CRL/11/lcs Attachment xc Mr. S. D. Ebneter Regional Administrator, Region II U. S Nucicar Regulatory Commission 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. R. E. Martin Office of Nuclear Reactor Regulations U. S.. Nuclear Regulatory Commission

' One White Flint North, Mail Stop 9113 Washington, D.C.

20555 Mr. W. T. Orders NRC Resident Inspector Catawba Nuclear Stat. ion l

9012270228 901220 PDR ADOCK 05000414 9F

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4 SPECIAL REPORT CATAWBA NUCLEAR STATION DIESEL GENERATOR 2A INVALID FAILURE DUE TO OPERATOR ERROR DURING MONTHLY OPERABILITY TESTING OF ENGINE An invalid failure (start #637) of Diesel Generator (D/G) 2A occurred on December 4, 1990 at 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br />. The failure occurred during the air roll test preceding the start attempt for the normal monthly operability performance test (PT/2/A/4350/02A). NO attempt was made to start the engine at this point. D/G 2A was on a monthly operability test schedule at the time of this invalid failure. There have been 0 valid failures in the past 20 valid starts and 2 valid failures in the past 100 valid starts for D/G 2A.

Immediately following tho inability to roll, the Mechanical Supervisor was called because the barring device had just been removed for rebuilding. The Supervisor immediately recognized the problem. The removal of the barring device had caused the safety pin to move slightly therchy preventing the engine from being air rolled. This system is designed to prevent air rolling the engine during maintenance when the barring device is in use, thus providing a positive personnel safety function._ A spacer was installed to maintain the pin in its intended position..thus restoring the engine to an "available for operation" condition. The D/G could respond to and..istain all emergency start demands as designed.

Unavailable time fcr this event was 45 minutes.

At 1500 on December-4, 1990, start and load (start 638) was successfully-performed per Operation procedure PT/2/A/4350/02A.

The barring device is a maintenance tool and, in itself, is not required for. operability.

This-inability to roll is considered an isolated incident in thst:

Operator error (Maintenance and Operations) is directly attributable for the insbility to roll.

No other failures were caused by this mechanism.

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