ML19282A615

LER 79-021/99T-0 on 790212:meterological Air Temp Change in Temp Indication Was Observed to Be off-scale Low.Caused by Faulty Resistance Temp Detector.Temp Element Replaced

ML19282A615
Person / Time
Site:	North Anna
Issue date:	02/27/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19282A612	List: ML19282A611 ML19282A615
References
LER-79-021-99T, LER-79-21-99T, NUDOCS 7903050183
Download: ML19282A615 (2)

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[5[.2] [ On 2 /1 'If 7 0 t b- l o a lscale" low. The Channel _ remained inoperable until 2 / 21/ Z(1. Energency Plan EPIP-2 I o .i Lwas available to provian for the health mutagety or the cenerni punite ir n roi-nco I o s lof radioactive material to the atmosphere were to occur. Th is event is repo rt abl e I o c lhy Tech. Spec. Act ion St at emont 3.3.3.4 (n) nnd Environmantni Toch. %o r . 'l _ i _ 4 l lo lil l I l

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41 l42N l@ l43 Ll@ l44 Rl 3l 6l 9l@47 CAUSE DESCPIPTION AND CORRECTIVE ACTIONS l i j o l lThe low AT air temperature indication was caused by a faulty RTD temperature elenant, l R W lThe temperature elemont was replaced and the appropriate instrumant Calibration I i j l procedure was performed. l l

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

Attachment:

Page I cf 1 Docket No. 50-338 Report No. LER 78-021/99T-0 Description of Event:

On 2/12/79 at approximat(1y 1500, the environmental Instrument technician performing )ther duties at the meterological station observed the air tempera-ture /.T Recorder to be "off 'cale" low. This indication was determined to be erroneous and prompted a troubleshooting evolution which lasted until 2/21/79 at 1130 when the AT air temperature channel was declared operable. The extended period of time for troubleshooting was caused by the fact that the trouble was intermittent in nature and inclement weather conditions hampered repair efforts.

This event constituted a 10 day reportable occurrence on 2/19/79 ii accordance with Tech Spec 6.9.2 and Environmental Tech Spec 5.6.2.1.

Probable Consequences of Occurrence During the 8 day, 20 hour2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> and 30 minutes time interval when the channel was inoperable, Emergency Plan Implementing Procedure (EPIP-2) was available to provide for the health and safety of the general public if a routine or accidental release of radioactive material to the atmosphere were to occur.

Cause This event was caused by a faulty Rosemont Temperature Element Model 104ABG1. The element failed intermittently in such a way to cause the air temperature aT recorder to read "off scale" low.

Immediate Corrective Action The immediate corrective action was to inform the instrument department of the problem and to commence troubleshooting and replace the RTD.

Scheduled Corrective Action No scheduled corrective action is required.

Actions to Prevent Recurrence No further action required.