05000336/LER-1980-014-03, /03L-0:on 800327,w/plant at 100% Power,A Control Room Air Conditioning Exhaust Fan (a Crac) Placed Out of Svc to Replace Noisy Motor Bearings.Caused by Natural end-of-life of Bearings.Shaft Rebuilt & Returned to Svc

/03L-0:on 800327,w/plant at 100% Power,A Control Room Air Conditioning Exhaust Fan (a Crac) Placed Out of Svc to Replace Noisy Motor Bearings.Caused by Natural end-of-life of Bearings.Shaft Rebuilt & Returned to Svc

ML19309G059
Person / Time
Site:	Millstone
Issue date:	04/28/1980
From:	Criscione J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309G052	List: 05000336/LER-1980-014, Forwards LER 80-014/03L-0 05000336/LER-1980-014-03, /03L-0:on 800327,w/plant at 100% Power,A Control Room Air Conditioning Exhaust Fan (a Crac) Placed Out of Svc to Replace Noisy Motor Bearings.Caused by Natural end-of-life of Bearings.Shaft Rebuilt & Returned to Svc
References
LER-80-014-03L, NUDOCS 8005020286
Download: ML19309G059 (1)

LER-1980-014, /03L-0:on 800327,w/plant at 100% Power,A Control Room Air Conditioning Exhaust Fan (a Crac) Placed Out of Svc to Replace Noisy Motor Bearings.Caused by Natural end-of-life of Bearings.Shaft Rebuilt & Returned to Svc

Event date:
Report date:
3361980014R03 - NRC Website

text

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(>3 EVENT DATE 74 lb HEPOHT JATE 80 EVENT DESCalPTION AND PROB ADLE CONSEQUENCES h io 121 i With the plant at 100 percent power level, the ' A' Control Room air conditioning l

iTil I exhaust fan (' A' CRAC) was placed out of service to replace noisy motor bearings (shaf t i 3l4l l end and opp. end bearings).

The 'B' CRAC was verified operable and the plant was l

3 I s l I operated in accordance with the action statement of section 3.7.6.1 of Technical l

Oy l Specifications.

The motor bearings were replaced, the motor shaft rebuilt and the ' A' l 0171 l CRAC returned to service within 5 days.

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JJ 34 35 36 3d 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i 1O l [ The cause of failure was the natural end of life of the motor bearings, which caused I

g l excessive motor shaft wear.

Motor manufacturer was General Electric (Model flo.

I g 1 5Kl84AL6485) and bearing manufacturer was SKF (GE Part No. 25BC02XP and 30BC02XP).

Thel i 131 l ' A' CRAC was taken out of service, the motor bearings replaced and shaft rebuilt and l

i l41 l the unit returned to service.

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