05000321/LER-1981-084-03, /03L-0:on 810804,Div I Plant Svc Water Strainer P41-D103A Found Clogged.Personnel Damaged Strainer Drum Drive Motor While Trying to Clear Strainer.Caused by Strainer Drum Vertical Positioning Being Out of Adjustment

/03L-0:on 810804,Div I Plant Svc Water Strainer P41-D103A Found Clogged.Personnel Damaged Strainer Drum Drive Motor While Trying to Clear Strainer.Caused by Strainer Drum Vertical Positioning Being Out of Adjustment

ML20010F220
Person / Time
Site:	Hatch
Issue date:	08/27/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F213	List: 05000321/LER-1981-084, Forwards LER 81-084/03L-0 05000321/LER-1981-084-03, /03L-0:on 810804,Div I Plant Svc Water Strainer P41-D103A Found Clogged.Personnel Damaged Strainer Drum Drive Motor While Trying to Clear Strainer.Caused by Strainer Drum Vertical Positioning Being Out of Adjustment
References
LER-81-084-03L, LER-81-84-3L, NUDOCS 8109090508
Download: ML20010F220 (2)

LER-1981-084, /03L-0:on 810804,Div I Plant Svc Water Strainer P41-D103A Found Clogged.Personnel Damaged Strainer Drum Drive Motor While Trying to Clear Strainer.Caused by Strainer Drum Vertical Positioning Being Out of Adjustment

Event date:
Report date:
3211981084R03 - NRC Website

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t.0 61 DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTIOfJ AND PROBABLE CONSEQUENCES h

! f01T1 l On 8-4-81, the Div. I Plant Service Water (PSW) strainer P41-D103A was l

! iO iai i found clogged.

In an effort to clear the' strainer, personnel inadver-1 ll10I411tantly damaged the strainer drum drive-motor, disabline the strainer.

l l' I O l s i l'The strainer was repaired and returned to service.

Two hours later the l l10to1Istrainer became clogged again.

Efforts to clear the strainer were un-1 l successful. A 7-day LCO was declared per T.S.

3.5.J. This is a non-repe-l 0 7 lOIRIltitive event. There were no effects upon public health or safety.

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CAUSE DESCHiPTION AND CORRECTIVE ACTIONS h l li l O l l The strainer was disassembled for cleanine and insnection.

The strninori l drum vertical positioning was found to be out of adjusemone.

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i i ii i,il caused excessive friction between the drum and the body.

The drum was l

lil3l l prope'rly adjusted, and PSW Div. I was returned to service.

The unit is I li l41 I now in full compliance and no further action or reportine is reauired.

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2 LER #:

50-321/1981-084 Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-084 Approximately 0535 on 8-4-81, div. I Plant Service Water (PSW) system pressure was observed to be higher than normal.

It was found that the drum of div.

I PSW strainer P41-D103A had stopped rotating.

This usually accompanies severe clogging of the strainer media.

As a result, the self-cleaning backwash system of the strainer was inoperable.

In an effort-to prevent total stoppage of the strainer and loss of div.

I service

water, personnel were dispatched to the intake structure to attempt and clear the strainer.

Manual reverse rotation of the strainer drum has in the past proved helpful in freeing the drum.

In the process of doing this the drum drive-motor mounting studs were sheared rendering the strainer and div. I of Plant Service Water inoperable.

A 7 day LCO was declared per Tech Specs 3.5.J.

The motor mounting studs were replaced, the strainer drum was freed and div. I service water was returned to service at approximately 1000.

Due to the small operating clearance between strainer drum and body, it is rot unusual for the drum to bind against the body whenever inclimate weather conditions prevail that cause an abnormal amount of debris in the river water.

This in fact, was what precipitated this strainer problem.

At approximately 1145 of the same day, the same symptoms were again noted on div. I PSW and the strainer drum was again found stuck.

Plant Service Water pumps P41-C001ASC were secured, however, efforts to free the strainer drum were unsuccessful and div. I service water was declared inop.

A 7 day LCO was declared (Tech Specs 3.5.J).

The strainer was disassembled for cleaning and inspection.

The drum vertical positioning was found to be out of adjustment due to loosening of the lock nuts.

This caused excessive friction between the drum and the body, eventually tripping the drum drive-motor.

Strainer filter media was c1 caned and the drum was properly positioned inside the body.

The strainer was checked for proper operation upon reassembly, and div.

I returned to service.

This is a non-repetitive occurrence.

This RO covers deviation reports 1-81-179 and 1-81-180.

There were no effects upon public health or safety due to this event.

The unit is now in full compliance and no further reporting is required.

I