ML20050D464

Updated LER 82-020/01T-1:on 820315,standby Diesel Generator Tripped in Start Sequence While Performing Surveillance Testing.Caused by Procedural Deficiency Allowing Both Fuel Oil Filters to Be Changed W/O Filing & Renting Casings

ML20050D464
Person / Time
Site:	Duane Arnold
Issue date:	04/05/1982
From:	Van Sickel J IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20050D460	List: ML20050D459 ML20050D464
References
LER-82-020-01T, LER-82-20-1T, NUDOCS 8204120231
Download: ML20050D464 (3)

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DUANE ARNOLD ENERGY CENTER

', IOWA ELECTRIC LIGHT AND POWER COMPANY LICENSEE EVENT REPORT - SUPPLEMENTAL DATA DOCKET NO. 050-0331 Licensee Event Update Report Date: 4/5/82 Reportable Occurrence No.82-020 Event

Description:

During normal operation while performing the monthly surveillance testing, standby diesel generator 1G-21 tripped in the start sequence before reaching the rated frequency and voltage. As required by Technical Specification 3.8.B.1 for an inoperable diesel generator, a 7-day limiting condition for operation (LCO) was entered. The redundant standby diesel generator, 1G-31 was operable. The 7-day LC0 was ended after approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when IG-21 was made operable.

There have been no similar previous occurrences.

Cause

Description:

The diesel generator trip was caused by a procedural deficiency which allowed both fuel oil filters on diesel generator 1G-21 to be changed on February 25, 1982 without requiring that the filter casings be properly filled and vented.

This caused 1G-21 to trip from fuel starvation during the start sequence.

At the time, it was mistakenly believed that the fuel oil filters were to be changed without making the diesel generator inoperable. Thus 1G-21 was not declared inoperable when its filters were changed. For the same reason, post maintenance operability testing was not performed.

Corrective Action:

The fuel oil system for diesel generator 1G-21 was primed and vented. Then 1G-21 was functionally tested satisfactorily and made operable to end the 7-day LC0 entered that day.

To prevent recurrence, maintenance procedures for diesel generator fuel oil filter maintenance have been developed.

Administrative controls will be modified to assure post maintenance operability of safety related equipment. These changes will include a mechanism to ensure that safety related maintenance is performed in accordance with adequate maintenance procedures. In addition, an independent review by qualified personnel to verify the adequacy of post maintenance operability testing will be required. These changes will be in place by May 15, 1982.

Special testing was performed on 4/4/82 which simulated an automatic start of the 1G-21 standby generator. Prior to the test the conditions present after the maintenance was performed on February 25, 1982 were recreated, i.e., the fuel oil filters were changed and the filter casings were not refilled with fuel oil.

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. DUANE ARN0LD ENERGY CENTER

. IO!!A ELECTRIC LIGHT AND POWER COMPANY LICENSEE EVENT REPORT - SUPPLEMENTAL DATA DOCKET NO. 050-0331 Licensee Event Update Report Date: 4/5/82 Reportable Occurrence No.82-020 Corrective Action (Cont.)

During the first test 1G-21 started and reached rated speed and voltage 30.2 seconds after automatic start initiation. The time specified in the DAEC FSAR is 10 seconds.

A second test was conducted during which 1G-21 reached rated speed and voltage in 30.3 seconds. The completed test procedures are available for review on site.

This testing was witnessed by the NRC Resident Inspector.

The NSSS vendor has been requested to evaluate the effect of this delayed start time for IG-21 on the DAEC Accident Analysis.

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