05000325/LER-1980-081-03, /03L-0:on 801010,diesel Generator 3 Failed to Start within Required 10-s.Caused by Stuck Manual Test Button on Starting Air Pilot Valve of Cylinder 1.Button & Housing Disassembled & Cleaned & Button Sanded

/03L-0:on 801010,diesel Generator 3 Failed to Start within Required 10-s.Caused by Stuck Manual Test Button on Starting Air Pilot Valve of Cylinder 1.Button & Housing Disassembled & Cleaned & Button Sanded

ML19340C146
Person / Time
Site:	Brunswick
Issue date:	11/07/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340C137	List: 05000325/LER-1980-081, Forwards LER 80-081/03L-0 05000325/LER-1980-081-03, /03L-0:on 801010,diesel Generator 3 Failed to Start within Required 10-s.Caused by Stuck Manual Test Button on Starting Air Pilot Valve of Cylinder 1.Button & Housing Disassembled & Cleaned & Button Sanded
References
LER-80-081-03L, LER-80-81-3L, NUDOCS 8011140044
Download: ML19340C146 (2)

LER-1980-081, /03L-0:on 801010,diesel Generator 3 Failed to Start within Required 10-s.Caused by Stuck Manual Test Button on Starting Air Pilot Valve of Cylinder 1.Button & Housing Disassembled & Cleaned & Button Sanded

Event date:
Report date:
3251980081R03 - NRC Website

text

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REPORT QATE 80 EVENT DESCRIPTION AND PAOB ABLE CONSEQUENCES h [o l 2 l l During the performance of required testine, as a result of the No. 1 Diesel Generator !

Io Ia1 I being out of service for its annual inspection, the No. 3 Diesel Generator failed to l

[oq.,j l start within the required ten seconds. The No. 3 Diesel Generator was then declared

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LER ATTACH}ENT - RO # l-80-81 Facility: BSEP Unit No. 1 Event Date:

10-10-80

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A stuck manual test button on the starting air pilot valve of No.1 cylinder caused the pilot valve to remain open. This allowed the starting air to oppose normal engine rotation and resulted in a starting time of 13.9 seconds.

An examination of the test button housing assembly revealed the button to be stuck in the depressed position due to a close fit between it and the housing.

The button and housing were disassembled and cleaned and the button was sanded to reduce its dia=cter, thus allowing free travel within the housing. Repeated test operations of the button verified its normal operation. The remaining starting air pilot valve test buttons on the engine were inspected and no prob-lems were f.'ound.

The diesel was then satisfactorily tested with a starting j

time of 8.2 seconds. As there is no' past history of similar events involving this component, this is considered an isolated event with no further corrective action required.

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