05000339/LER-1980-053-03, /03L-0:on 800825,during Mode 1 Operation,C Steam Line Flow Channel 4 Indicated Low & Channel Placed in Trip Condition.Caused by Instrument Drift.Channel Recalibr & Returned to Svc

/03L-0:on 800825,during Mode 1 Operation,C Steam Line Flow Channel 4 Indicated Low & Channel Placed in Trip Condition.Caused by Instrument Drift.Channel Recalibr & Returned to Svc

ML19338D333
Person / Time
Site:	North Anna
Issue date:	09/16/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D332	List: 05000339/LER-1980-053, Forwards LER 80-053/03L-0 05000339/LER-1980-053-03, /03L-0:on 800825,during Mode 1 Operation,C Steam Line Flow Channel 4 Indicated Low & Channel Placed in Trip Condition.Caused by Instrument Drift.Channel Recalibr & Returned to Svc
References
LER-80-053-03L-01, LER-80-53-3L-1, NUDOCS 8009220360
Download: ML19338D333 (2)

LER-1980-053, /03L-0:on 800825,during Mode 1 Operation,C Steam Line Flow Channel 4 Indicated Low & Channel Placed in Trip Condition.Caused by Instrument Drift.Channel Recalibr & Returned to Svc

Event date:
Report date:
3391980053R03 - NRC Website

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LIC.2iSE NUMBER LICENSE TYPE CAT

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

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On August 25, 1980 during normal mode 1 operation, C steam line flow channel

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4 was observed to be indicating low. The channel was placed in a tripped

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condition within I hour in accordance with T.S. 3.3.1.1.

Therefore the health /

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and safety of the public were not affected. This event is reportable pursuant /

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to T.S. 6.9.1.9.b.

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SYSTEM

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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Subsequent investigation revealed that a very slight instrument drift had

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occurred. This drift was determined to be less than 2% of the preset value.

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The channel was recalibrated and returned to service.

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FACILITY METHOD OF STATUS

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LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUH3ER TYPE DESCRIPTION (39)

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NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 g 000220 %O

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Virginia Electric and Power Company North Anna Power Station, Unit #2 Attachment: Page 1 of I Docket No. 50-339 Peport No. LER 80-053/03L-0

Description of Event

On August 25, 1980 in mode t operation, the C steam line flow channel 4 was observed to be indicating low. The channel was placed in

.the tripped condition within I hour in accordance with T.S. 3.3.1.1.

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

Probable Consequences of Occurrence The consequences of this event were limited because the channel was placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The channel was recslibrated and returned to service within 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br />..Therefore, the health'and safety of the public were not affected.

Cause of Event

This event was caused by instrument drift. The drift was very small (< 2%).

i Immediate Correctiva Action The channel was recalibrated and returned to service.

Scheduled Corrective Action

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• No further actica required.

Actions Taken to Prevent Recurrence No further action required.

Generic Implications

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There are no generic implications associated with this event.

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