ML20039D503

LER 81-046/03L-0:on 811201,control Bldg Ventilation Sys Exhaust Isolation Damper Failed to Close Rendering a Control Room Standby Filter Unit Inoperable.Caused by Misalignment of Damper Operator.Repair Procedure to Be Corrected

ML20039D503
Person / Time
Site:	Duane Arnold
Issue date:	12/22/1981
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039D502	List: ML20039D501 ML20039D503
References
LER-81-046-03L, LER-81-46-3L, NUDOCS 8201050070
Download: ML20039D503 (2)

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David M. Varner ,,oy g; 319-851-5611 2, PDR ADOCK 05000331 PAREA S PDR 3

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. DUANE ARNOLD ENERGY CENTER -

Iowa' Ele ~ctric Light and Power Iompany Licensee Event Report - Supplemental Data Docket No. 050-0331 Licensee Event Report Date: 12'22-81 Repor+able Occurrence No: 81-046 4  %

. Event Description During normal operation while performing surveillance testing, control building ventilation system exhaust isolation damper IV-AD-31A fa~iled to close. This rendered the "A" control room standby filter unit inoperable and a 7-day limiting condition for operation was entered per Tech. Spe'c .

3.10.A.3. The redundant system was demonstrated to be operable immediately and daily thereafter. One previous similar occurrence (See R0 81-045).

Cause Description . ,

Following repairs made a3 a result of the previous event, the damper operator had apparently been reinstalled with a severe misalignment between the damper operator' shaft Tnd the damper shaft. This resulted in accelerated bearing failure in the damper c wrator. The root cause of this and the previous event was a

' procedural defi - incy. The Rep ~ air Procedure did not provid5 adequate guidance concerning prope. alignment of the damper operator.

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. Ccrrective Action .

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The damper operator cylinder wills were honed and the. bearing and shaft.were

. replaced. The damper operator was-reinstalled and properly aligned to the damper shaft. The Repair Procedure will be corrected.

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