05000338/LER-1979-067-03, /03L-0 on 790504:radiation Monitoring Channel RM-RMS-159 Was Declared Inoperable Due to Filter Drive Failure.Caused by Failure of Slow Speed Motor Shaft on Paper Drive.Filter Paper & Motor Shaft to Be Replaced

/03L-0 on 790504:radiation Monitoring Channel RM-RMS-159 Was Declared Inoperable Due to Filter Drive Failure.Caused by Failure of Slow Speed Motor Shaft on Paper Drive.Filter Paper & Motor Shaft to Be Replaced

ML19289F337
Person / Time
Site:	North Anna
Issue date:	06/01/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289F334	List: 05000338/LER-1979-064-03, /03L-0 on 790503:cooling Water Line to Superchargers on 1H Diesel Developed Leak at Threaded Connection.Possibly Caused by Incomplete Cleaning of Threads & Insufficient Torquing of Connection During Installation 05000338/LER-1979-067-03, /03L-0 on 790504:radiation Monitoring Channel RM-RMS-159 Was Declared Inoperable Due to Filter Drive Failure.Caused by Failure of Slow Speed Motor Shaft on Paper Drive.Filter Paper & Motor Shaft to Be Replaced ML19289F333
References
LER-79-067-03L, LER-79-67-3L, NUDOCS 7906070247
Download: ML19289F337 (2)

LER-1979-067, /03L-0 on 790504:radiation Monitoring Channel RM-RMS-159 Was Declared Inoperable Due to Filter Drive Failure.Caused by Failure of Slow Speed Motor Shaft on Paper Drive.Filter Paper & Motor Shaft to Be Replaced

Event date:
Report date:
3381979067R03 - NRC Website

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HE PO97 D A T E FJ EVENT DECCH;PTION AND PHOil AHLL CONSEQUENCES h g gj l On May 4,1979, radiation t'anitorin", channel RM-RMS-159 was declared inoperable I

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This event had no effect on public health or safety. ]

Reportable pursuant to T.S.6.9.1.9.b.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i

O l Tne cause for the filter failure was due to the slow speed motor shaft on the paoer l [i l 3 l drive failing. A maintenance report was subaitted to replace filter paper and motor!

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A Virginia Electric and Power Company North Anna Power Station, Unit No. 1

Attachment:

Page 1 of 1 Docket Number 50-338 Report Number 79-067/03L-0 IMicrp tion of Event _:

On May 4,1979, while investigating a simultaneous Hi and to flow alarm in the sample line for the containment particulate monitor, Itt-RMS-159, the particulate filter drive mechanism was found inoperable due to a broken slow speed motor shaft.

Probable Consequences of Occurrence:

Channel PJ!-10tS-159 was declared inoperable. The required grab samples were taken.

In addition, the containment atmosphere gaseous radioactivity moni-toring system and containment sump discharge flow measurement systems were cperable. The health and safety of the public were not endangered. There are no generic implications.

Causes of Occurrence:

The slow speed motor shaft for the filter paper on Pli-RMS-159 severed pre-venting the f11ter paper from traveling.

Immediate Corrective Action

A maintenance report was submitted to the instrument shop to determine why RM-RMS-159 was inoperabic.

The slow speed motor shaf t and filter paper were replaced. Once the work was completed, the channel was returned to service.

During this period appropriate grab samples were taken.

Scheduled Corrective Action:

None.

Actions to Prevent Recurrence:

2233 147