05000346/LER-1978-049-03, /03L-0:on 780509,generator Load Not Constant & Diesel Generator Air Intake Low Pressure Alarm Received During Surveillance Test.Maint Insp Conducted But Cause Undetermined.Surveillance Test Completed 780514

/03L-0:on 780509,generator Load Not Constant & Diesel Generator Air Intake Low Pressure Alarm Received During Surveillance Test.Maint Insp Conducted But Cause Undetermined.Surveillance Test Completed 780514

ML19326A338
Person / Time
Site:	Davis Besse
Issue date:	06/01/1978
From:	Beeler T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A303	List: 05000346/LER-1978-049, Forwards LER 78-049/03L-0 05000346/LER-1978-049-03, /03L-0:on 780509,generator Load Not Constant & Diesel Generator Air Intake Low Pressure Alarm Received During Surveillance Test.Maint Insp Conducted But Cause Undetermined.Surveillance Test Completed 780514
References
LER-78-049-03L, LER-78-49-3L, NUDOCS 8002030156
Download: ML19326A338 (2)

LER-1978-049, /03L-0:on 780509,generator Load Not Constant & Diesel Generator Air Intake Low Pressure Alarm Received During Surveillance Test.Maint Insp Conducted But Cause Undetermined.Surveillance Test Completed 780514

Event date:
Report date:
3461978049R03 - NRC Website

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6.3 63 EVENT QATE 74 75 REPCRT DATE 80 EVENT DESCRIPTION ;?40 PRC5 AELE CCNSECUENCES h 10121 1 At 1745 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.639725e-4 months <br /> on "av 9, 1978. While nerfortine the Diesel Gener2Mr Refuelim Su M 1 l [o;s,l lance Test, the generator load would not stay constant and the diesel generator air I

'I o l a ; i intake low pressure alar = vas received.

The test was susuended at this coint, and thel l o l s t ; diesel generator declared inoperable.

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Diesel Generator 1-2 was ooerable l l c !e i I had e=ergency power been reCuired.

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CAUSE DESCRIPTION AND CCRRECT!VE AC lCNS @

l i l o ; l The cause of this occurrence is not known.

Extensive =aintenance investications were l li ii l l conducteld but the exact cause was not discovered. At 0415 hours0.0048 days <br />0.115 hours <br />6.861772e-4 weeks <br />1.579075e-4 months <br /> on Mav 14 1978.

,,,,,jSurveillance Test ST 5081.01, " Diesel Generator Menthlv Test" was co=cleted.

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e DATE OF EVENT: May 9, 19 78 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Diesel Generator 1-1 declared inoperable on May 9, 1978.

Conditions Prior to Occurrence: The unit was in Mode 6, with Power (}%T) = 0, and Load (Mh'E) = 0.

Descriution of occurrence: At 1745 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.639725e-4 months <br /> on May 9,1978, while perfor=ing Surveil-lance Test ST 5081.02, " Diesel Generator Refueling Surveillance Test", the genera-tor load would not stay constant and the diesel generator air intake low pressure alarm was received. The test was suspended at this point, and the diesel generator declared inoperable.

This occurrence did not place the unit in the Action Statenent of the Technical Specification 3.8.1.2 because the plant Was in Mode 6 which requires only one diesel generator to be operable while in Modes 5 and 6.

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' Designation of Accarent Cause of Occurrence:

The cause of this occurrence is not known.

Analysis of Occurrence:

There was no danger to the health and safety of the public or to unit personnel.

The diesel generator was not required for energency power during the period of ti=e it was inoperable.

Diesel Generator 1-2 yas operable had e=ergency power been required.

Corrective Action

Under Maintenance Work Order IC-322-78, Diesel Generator 1-1 Air Intake Lov Pressure Switch was checked for calibration and operation.

It was found satis %ctory.

Under Maintenance Work Orders 78-1184 and 78-1192 unit per-sonnel worken with Woodvard field service engineers to assure proper governor operation. Maintenance Work Order 78-1209 was issued to check Diesel Generator 1-1 intake air pressure, all inlet pipe joints for leakage, oil bath filter for blockage and found none.

At 0415 hours0.0048 days <br />0.115 hours <br />6.861772e-4 weeks <br />1.579075e-4 months <br /> on 167 14, 1978, Surveillance Test ST 5081.01, " Diesel Generator Monthly Test" was cc=pleted, and the diesel generator was declared operable.

vailure Data:

There have been no previous failures of the Diesel Generators used by load fluctuations.

LER #78-049