ML20023B265

LER 82-151/03L-0:on 821117,emergency Makeup Control Room Ventilation Fan B Failed to Start.Caused by Bent Outlet Damper Shaft to B Train & Broken Bearing Housing Cap. Linkage Misaligned When Installed Initially.Damper Repaired

ML20023B265
Person / Time
Site:	LaSalle
Issue date:	12/15/1982
From:	Wittenburg K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20023B264	List: ML20023B263 ML20023B265
References
LER-82-151-03L, LER-82-151-3L, NUDOCS 8212270180
Download: ML20023B265 (2)

Text

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l 8 60 DOCKET NLMBER EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h Io l2l l On 11/17/82 with the Unit is Startup Mode, the "B" Emergency Makeup Control Room [

ventilation fan failed to start during the performance of LOS-VC-M1. The "A" Emer- [

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go,,,l gency ventilation fan was started per Tech. Spec. 3.7.2 in conjunction with the [

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normal VC HVAC System. The health a'nd safety of plant personnel was maintained at  ;

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Il CAUSE DESCRIPTICN ANC CCRRECTIVE ACTICNS @

Investigation showed that the outlet damper shaft of the "B" train was bent and the ligoll t

,,,,,g b earing housing cap was broken. When the linkage was initially installed it appears to

, ,,,,,jhave been misaligned. The damper was removed to effect repairs and temporary duct work installed until the damper was reinstalled. "B" train passed LOS-VC-M1 after being *

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d I. LER NUMBER: '82-151/03L-0 II. LASALLE COUNTY STATION: Unit 1 III. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On 11/17/82 with the unit in Startup Mode, the "B Emergency Makeup Control Room Ventilation Fan failed to start during the performance of LOS-VC-M1. Technical Specification 3.7.2 prevents the unit from going to the run condition.

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The "A" Emergency Makeup Control Room Ventilation Fan was started per T.S. 3.7.2 in the pressurization mode, in conjunction with the normal VC HVAC system. The health and safety of plant personnel was main-tained at all times.

VI. CAUSE:

The outlet damper of the "B" train failed to open. Investigation found that the damper shaf t was bent and the bearing housing cap was broken.

This damage was apparently caused by a misalignment on the linkage when it was initially installed.

4 VII. CORRECTIVE ACTION:

i j Work Request L19787 was written and the damper was removed to complete j the repairs. Temporary duct work was installed and the damper position i limit switches were jumpered to allow the train to run if needed. LOS-VC-M1 was performed satisfactorily to prove the operability of the "B" Emergency Makeup Ventilation System after the damper was reinstalled.

This is believed to be an isolated incident.

I Prepared by: K. Wittenburg

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