05000346/LER-1981-009-03, /03L-0:on 810128,diesel Generator 1-2 Could Not Be Started W/Left Side Set of Air Start Motors During Diesel Generator Surveillance Test 5081.01.Caused by Failure of One Air Start Motor Due to Broken Solenoid Drive Shaft

/03L-0:on 810128,diesel Generator 1-2 Could Not Be Started W/Left Side Set of Air Start Motors During Diesel Generator Surveillance Test 5081.01.Caused by Failure of One Air Start Motor Due to Broken Solenoid Drive Shaft

ML19341C626
Person / Time
Site:	Davis Besse
Issue date:	02/27/1981
From:	Syslo J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19341C618	List: 05000346/LER-1981-009, Forwards LER 81-009/03L-0 05000346/LER-1981-009-03, /03L-0:on 810128,diesel Generator 1-2 Could Not Be Started W/Left Side Set of Air Start Motors During Diesel Generator Surveillance Test 5081.01.Caused by Failure of One Air Start Motor Due to Broken Solenoid Drive Shaft
References
LER-81-009-03L, LER-81-9-3L, NUDOCS 8103030847
Download: ML19341C626 (2)

LER-1981-009, /03L-0:on 810128,diesel Generator 1-2 Could Not Be Started W/Left Side Set of Air Start Motors During Diesel Generator Surveillance Test 5081.01.Caused by Failure of One Air Start Motor Due to Broken Solenoid Drive Shaft

Event date:
Report date:
3461981009R03 - NRC Website

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8 60 61 DOCKET NUMBER Gd b9 EVENT DATE 14 75 REPORT DATE alo EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lO l a l l (NP-33-81-07) on 1/28/81 at 0330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> during the performance of the Diesel Generator i l Monthly Test ST 5081.01, Diesel Generator (DG) 1-2 could not be started with the lef t l O 3 l0 l4 l l side set of air start motors. It would start with the right side motors. The statiori Lo i s i i was in Mode 5 at the time, and the requirements of Technical Specification 3.8.1.2 l

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There we.s no danger to the health and safety of the public or statiorj lo l7l i personnel. Diesel Generators 1-1 and 1-2 were operable during this time. This event.

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33 35 36 Ji 40 el 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS h li l o l l The cause of the occurrence was the f ailure of one air start motor. The air start motgr lhad a broken solenoid drive shaft. The break is considered a random failure. Under I

i i l Maintenance Work Order 81-1406, the air start motor was replaced. The Emergency Diesel

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Jim Syslo

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE j

SUPPLEMENTAL INFORMATION FOR LER NP-33-81-07 DATE OF EVENT: January 28, 1981 0

FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Failure of one of four air start motors on Emergency Diesel Generator 1-2.

Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MRT) = 0 and Load (Gross MWE) = 0.

Description of Occurrence: On January 28, 1981 at 0330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> during the performance of the Diesel Generator Monthly Test Sr 5081.01, Diesel Generator 1-2 could not be started with the left side set of air start motors.

It would start with the right side motors.

".here are two sets of air start motors on each diesel.

Each set has two air start motors. The station was in Mode 5 at the time, and the requirements of Technical Specification 3.8.1.2 were being met by the operability of Diesel Generators 1-1 and 1-2.

Therefore, the station did not enter an action statement.

This event is being reported to document a component failure of one air start motor.

Designation of Apparent Cause of Occurrence: The cause of the occurrence is the com-ponent failure of an air start motor..The motor failed when the solenoid drive shaft broke. The starting sequence actuates the solenoid. The solenoid moves the solenoid drive shaft causing a gear attached to it to engage a planetary gear assenbly which is connected to the air start motor. The air supply line then opens to the air motor which starts the shaft turning. The solenoid drive shaft broke between the solanoid and the gear. The break is considered a random failure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. Emergency Diesel Generators 1-1 and 1-2 were operable during this time.

Corrective Action

The faulty air start motor was replaced under Maintenance Uork Order 81-1406.

The engine was tested satisfactorily by the performance of ST 5081.01.

Diesel Generator 1-2 was returned to normal at 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br /> on January 28, 1981.

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Failure Data: There have been no other previous occurrences of this nature.

LER #81-009

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