05000285/LER-1980-030-03, /03L-0:801211,diesel Generator 1 Failed to Start on Secondary Air Sys.Caused by Vanes of Air Motor Sticking & Preventing Motors from Turning.Vanes Cleaned & Motors Installed

/03L-0:801211,diesel Generator 1 Failed to Start on Secondary Air Sys.Caused by Vanes of Air Motor Sticking & Preventing Motors from Turning.Vanes Cleaned & Motors Installed

ML19351F505
Person / Time
Site:	Fort Calhoun
Issue date:	12/22/1980
From:	Tesarek J OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351F501	List: 05000285/LER-1980-030, Forwards LER 80-030/03L-0 05000285/LER-1980-030-03, /03L-0:801211,diesel Generator 1 Failed to Start on Secondary Air Sys.Caused by Vanes of Air Motor Sticking & Preventing Motors from Turning.Vanes Cleaned & Motors Installed
References
LER-80-030-03L, LER-80-30-3L, NUDOCS 8101130387
Download: ML19351F505 (4)

LER-1980-030, /03L-0:801211,diesel Generator 1 Failed to Start on Secondary Air Sys.Caused by Vanes of Air Motor Sticking & Preventing Motors from Turning.Vanes Cleaned & Motors Installed

Event date:
Report date:
2851980030R03 - NRC Website

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60 61 DOCKET NUV8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0 l2l l During the performance of ST-ESF-6, F.2, Appendix F, Diesel Generator #1 (DG-1) l l O i 3, I

failed 'to start on its secondary air system. DG-1 was removed from service in l

10 i.i i l accordance with Tech. Spec. 2.7(2)i and the secondary air start motors were re-I lo isi l paired. Prior to the incident, DG-1 had successfully started on its primary air l

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In addition, DG-2 was started to verify its operability.

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LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 ATTACHMENT N0. 1

Safety Analysis

Fort Caltuun Station Unit No.1 is designed such that a single failure cannet adversely affect the ability of the plant to be safely shutdown in the event of an accident. Although OG-1 failed to start on its secondt.ry air start system, it had previously successfully started on its primary air system.

In addition, DG-2 and both redundant offsite power supplies (161 KV and 345 KV) were available during the time that DG-1 failed to start on its secondary air system.

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• LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No, 1 Docket No. 05000285 ATTACHMENT NO. 2

Corrective Action

M.0. #8169 was initiated to repair the secondary air start motors of DG-1.

An inspection of the motors revealed that the vanes were stuck which prevented the motors from turning. The primary and secondary air start systems will be tested periodically per ST-ESF-6.

In addition, the primary and secondary air start motors and the air line s', 'ainers on the primary and secondary aid start systems will be inspected and cleaned annually per ST-ESF-6. The air line lubricators on the primary and secondary air start systems will also be inspected annually and, if necessary, they will be cleaned.

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LER No.80-030 Omaha Public Power District Fort Calhoun Station Unit No.1 i

Docket No. 05000285 ATTACHMENT N0. 3 l

Failure Data Previous related incidents are detailed in Unusual Event 73-5, Ab-normal Occurrence 75-20 and LER 77-12.

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