ML20052B425

Updated LER 82-020/01X-2:on 820315,standby Diesel Generator 1G-21 Tripped During Surveillance Testing.Caused by Procedural Deficiency,Allowing Fuel Oil Filter Change W/O Filling & Venting Filter Casings.Maint Procedures Written

ML20052B425
Person / Time
Site:	Duane Arnold
Issue date:	04/23/1982
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052B419	List: ML20052B418 ML20052B425
References
LER-82-020-01X, LER-82-20-1X, NUDOCS 8204300401
Download: ML20052B425 (3)

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71 REPORT QArg to 7 8 to el Cocat tT Numegn 48 09 SvtNT DATE 3 EVENT DESCRIPTION AND pmCSASLE CCNsECUENcES h lol2l l During normal operation while performina surveillance testing, standby d 1 mI iesel generator 1G-21 tripped in start sequence. As required by Technica l io t A i i 1 Specification 3.8.B.1, a 7-day LCO was entered. The redundant diesel q l i: # sj l enerator was operable. The 7-day LCO ended af ter aporoximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> w I t o ps i I hen 1G-21 was made noerahlo. Subsequent testino demonstrated enaine woul 1 10671 1 d have started with an auto start sinnal present. There have beon no ore i I o !e i I vinus simiIar occurrencos. sa I

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ii toi l Diesel trip caused by procedural deficiency which allowed both fuel oil I titiiI filters on 1G-21 to be changed without procerly fillina and venting the 1 i,#2, I filter casings. This caused the engine to trip from fuel starvation. Fue I i ii3i l 1 oil system was primed and vented and engine tested sat. To preclude re i Ii6.ii currence, maintenance procedures have been written. I s a s ao STAh Ii 15 I [E,_J@ l0 l9 l0 l@lNA

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Iowa Electric Light and Power Company Licensee Event Report - Supplemental Data Docket No. 050-0331 Licensee Event Update Report Date: 4/23/82 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)wasentered. The redundant standby diesel generator, 1G 31 was operable. The 7-day LC0 was ended af ter approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when 1G-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.

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v 3 DUANE ARN0LD ENERGY CENTER Iowa Electric Light and Power Company Licensee Event Report - Supplemental Data Docket No. 050-0331 Licensee Event Update Report Date: 4/23/82 Reportable Occurrence No: 82-020 Corrective Action: (Cont.)

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.

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 completed an evaluation of the effect of this delayed start time for diesel generator 1G-21 on the DAEC design basis accident analysis.

For the purposes of this evaluation, the design basis accident was assumed to occur with a loss of off-site power, the worst single f ailure (LPCI injection valve f ailure), and a 60-second delay in the start of diesel generator 1G-21.

This evaluation concluded that the peak clad temperature (PCT) resulting from the above accident would be well below the 2200*F PCT 10CFR50, Appendix K licensing limit and that the delayed start time for diesel generator 1G-21 would not have unacceptably affected the plant's response to such an i accident.

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