ML19275A231

LER 79-105/03L-0:on 790828,during Testing of Containment Particulate Monitor,Power Fuses Blew When Sample Pump Was Placed in Stop Position Causing Particulate & Gas Monitor to Be Inoperable.Caused by Shorted Valve K5

ML19275A231
Person / Time
Site:	North Anna
Issue date:	09/27/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19275A222	List: ML19275A221 ML19275A227 ML19275A231
References
LER-79-105-03L, LER-79-105-3L, NUDOCS 7910030357
Download: ML19275A231 (2)

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7 8 14 75 HE PORT DATE EVENT UESCRiPTION AND PROBABLE CCNSEQUENCES h o 2 l On August 28, 1979, during periodic testint of Containment Par t iculate Moni ent I o 3 } RM-RMS-159, the power fuses blew when the sample pump was placed in the stop positionl o 4 l causing both the containment particulate monitor and the containment cas rmnitor to b3 o s declared inoperable for almost 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. Since both monitors were returned to opera- 1 IO is l I ble status within the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> time limit allowed by the ACTION Statement. the health 1 o i l and safety of station personnel and the general public were not affected. Report- I iO1a l able pursuant to T.S. 6.9.1.9.b. I 80 1 8 9 SYSTEM CAUSE CAUSE C OY P. VALVE CODE COOE SUBCODE COVPONENT CODE SUBCODE SU8 CODE

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CAusE cEsCPIPTION AND CORRECTIVE ACTIONS h i a l The fuses blew when the sample pump was placed in the stop position because the coil I g,q on purge solenoid valve k5 shorted out. The solenoid valve coil was replaced and the I

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Vitgina Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-105/03L-0 Description of Event On August 28, 1979, during Mode 1 operation, the sample pump for the contain-ment particulate monitor and the containment gas monitor sas placed in the stop position for the performance of a periodic test. As soon as the pump was placed in the stcc position, the power fuses blew resulting in both contain-ment radiation monitors being declared inoperable which is in violation of T.S. 3.4. 6.1. RM-RMS-159 and RM-RMS-160 remained inoperable for almost 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Probable Consequences of Occurrence The Containment Particulate and Gas honitoring Cystems are used as a primary means of detecting a Reactor Cooling System leek. The systems also provide a signal to secure and isolate the Containment Purge Supply and Exhaust Systema on a high-high particulate or gas level in Mode 6. Both the Containment Particulate Monitor and the Containment Oas Monitor were returned to e,erable status within the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> time limit allowed by the ACTION statement a2d no violation of the Environmental Technical Specifications occurred. As a result, the health and safety of station personnel and the general public were not affected by this event. There are no generic implications associated with this occurrence.

Cause The cause for the fuses blowing when the sample pump was placed in the stop position was a shorted coil on purge solenoid valve k5.

Immediate Corrective Action New power fuses were immediately installed and the defective solenoid valve coil was replaced with a new coil. Both radiation monitors were then returned to service and the periodic test was re-performed with satisfactory results.

Scheduled Corrective Action No scheduled corrective action required.

Actions Taken To Prevent Recurrence No further actions required.

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