ML19260C108

LER 79-146/03L-0:on 791116,w/unit in Refueling Shutdown, Pressurizer Level Protection Channel III Found to Be Reading Erratic & Inconsistent W/Actual Level.Caused by Defective Module Amplifier in Transmitter LT-1461

ML19260C108
Person / Time
Site:	North Anna
Issue date:	12/14/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260C106	List: ML19260C105 ML19260C108
References
LER-79-146-03L, LER-79-146-3L, NUDOCS 7912180570
Download: ML19260C108 (1)

Text

NRC FORM 366 U. S. NUCLEAR RE ULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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REPORT DATE 80 7 8 EJ 61 DOCKET NUMB ER 68 6'J EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i On November 16, 1979, with the unit in a refueling shutdown, Pressurizer Level Protect 4 Io l3 l l 1 n Channel III was found to be reading erratic and inconsistent with actual level. I o 4 [ Since redundant protection channels were operable and in calibration, the health and I o s l safety of the general public were not affected. Reportable pursuant to T.S. 6.9.1.9.aj O 6  !

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44 47 CAUSE DESCRiPTIO.d AND CORRECTIVE ACTIONS h i O A defective electronic module amplifier in transmitter LT-1461 is suspected as the l

, y,,lcause for the discrepant readings. The level transmitter was replaced with a trans- I mitter fron Unit 2 and the new transmitter is presently being calibrated. I ITITl 11 1411 7 8 9 80 ST S *POAER OTHER STATUS IS O RY DISCOVERY DESCRIPTION lil5l @ l 0l Og 0l g l NA l lBl@l Routine Calibration Check l ACTIVITY CONTENT REL LEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA NA l l i l 869 l U{ SED OF@ U@l 7 10 11 44 l l 45 80 PERSONNEL EXPOSURES NU SER T E DESCRIPTIO i 7 l l l l l l l PE RSONNE L INJURIES

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7 i 9 8 9 U{E@l 10 80 PUBL ICI T Y NRC USE ONLY iSyE D DESCgTiOs(O) 7 91218 0 57C I l'lIlli lil.

12 l o l L_J81 68 69 80 5 7 8 9 10 NAME OF PREPARER W. R. Cartwricht PHONE: r7mg_90r_5151