05000339/LER-1980-021-03, /03L-0:on 800504,during Mode 3 Operation,Leaking Valve on Radiation Monitor RMS-259 Resulted in Low Flow to Monitor.Caused by Routine Failure of Valve Bonnet.New Valve Bonnet Installed

/03L-0:on 800504,during Mode 3 Operation,Leaking Valve on Radiation Monitor RMS-259 Resulted in Low Flow to Monitor.Caused by Routine Failure of Valve Bonnet.New Valve Bonnet Installed

ML19318C343
Person / Time
Site:	North Anna
Issue date:	06/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318C325	List: 05000339/LER-1980-021, Forwards LER 80-021/03L-0 05000339/LER-1980-021-03, /03L-0:on 800504,during Mode 3 Operation,Leaking Valve on Radiation Monitor RMS-259 Resulted in Low Flow to Monitor.Caused by Routine Failure of Valve Bonnet.New Valve Bonnet Installed
References
LER-80-021-03L-02, LER-80-21-3L-2, NUDOCS 8007010375
Download: ML19318C343 (2)

LER-1980-021, /03L-0:on 800504,during Mode 3 Operation,Leaking Valve on Radiation Monitor RMS-259 Resulted in Low Flow to Monitor.Caused by Routine Failure of Valve Bonnet.New Valve Bonnet Installed

Event date:
Report date:
3391980021R03 - NRC Website

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c U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

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R DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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During Mode 3 operation, a diaphram valve on radiation monitor (RMS-259) was

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leaking causing low flow to the monitor. Both associated monitors (RMS 259

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and 260) were removed from service to allow repair contrary to T.S. 3.4.6.1.

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obtained, therefore the health and safety of the public were not affected.

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This event is reportable pursuant to T.S. 6.9.1.9.b.

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SYSTEM

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The valve bonnet leakage is considered to be a routine failure without generic /

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service.

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NAME OF PREPARER W. R. CARTWRIGHT PHONE g 31 894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #2

Attachment:

Page 1 of I Docket No. 50-339 Report No. LER 80-021/03L-0

Description of Event

On June 4, 1980, during Mode 3 operation, a diaphram valve on radiation monitor RM-RMS-259 was found to be leaking through the body-to-bonnet connection.

In order to repair, two radiation monitors (RMS-259 and 260) were removed from service contrary to T.S. 3.4.6.1.

This item is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence In accordance with the action statement, 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> grab samples were obtained and therefore the health and safety of the public were not affected.

Cause of Event

The failure of the diaphram valve is considered to be a routine failure without generic implication.

Immediate Corrective Action

The bonnet was replaced on the defective valve and the system was returned to service.

Scheduled Corrective Action No further action required.

Actions Taken to Prevent Recurrence No further action required.