ML19259C190

LER 79-037/03L-0 on 790515:average Power Range Monitor a Upscale Rod Block Alarm Out of Spec High. Caused by Instrument Drift.Instrument Setpoint Lowered

ML19259C190
Person / Time
Site:	Brunswick
Issue date:	06/12/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19259C189	List: ML19259C188 ML19259C190
References
LER-79-037-03L, LER-79-37-3L, NUDOCS 7906140314
Download: ML19259C190 (2)

Text

1RC FORM 3b6 . . Hi OM i U 77)

LICENSEE EVENT REPORT

. CONTROL BLOCK: l 1

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lh IPLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o 1 lN lC lB l E l Pl 1lgl 0 l 0 -l 0 j 0 0l 0l 0 0l 0l lg 4l1llj1l1 gl 26 l

$7 CAT 68 jg i 8 9 LICENSEE CODE 14 tb LICENSE NUMBEH 26 LICENSE TYPE JO CON'T 6 1 2

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3$n"c'60Ll@l0 61 5 l0DOCKET l- l NUMB 0 ] ER3 l 21 685 @l 69 0 511l5 EVENT DATE 7 l 9 lgl 0 14 75 REPORT DATE 7l9l@ 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCET h o 2 l While performing PT 1.1.7PC, APRM tixed Bias Calibration, APRM "A" upscale rod l o

block alarm was out of specification high. The alarm required a 8.68 volt signal g a I o 4 l to actuate while Technical Specifications require a maximum signal of 8.64 volts.

o s I Technical Specifications 3.2.2, 6.9.1.9a lo e l0 7 l l0 8 l I

/ 8 9 80 SYS T E P.1 C AUS E CAUSE C O*.t P. VALVE CODE CODE SU8 CODE COMPONEN T CODE SUBCODE SUBCODE lo 7_

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9 10 11 12 13 18 19 20

_ SEQUE NTI AL OCCURRENCE nEFORT REVIS'ON LE R RO EVENT YE AR HEPORT c40 CODE TYPE NO.

R E PO R T l7 9l l__ l0l3l7l l ,,, - l 0 l3 [ [ Ll l l0 l 21 22 23 24 26 21 21 29 30 31 32 T KEr A TO O J PLA T P Ti HOURS S 8 i FO UB. SL PP LI E MANUFA TURER l33E l@l7. 34 l@ lZl@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 gi g l During the previous calibration, the alarm had been set at B.64 volts per PT 1.1.7PC. g g , g The tolerance band for this instrument is B.64 + 0 - 0.08 volts. Due to having been ;

, ,  ; set on the t'pper limit, instrument drif t (temperature change aging) and possible l

, [ test equipment tolerance helped the instrument to be out of calibration. The l 3

, , g instrument was recalibrated with a setpoir.t of 8.60 volts. PT 1.1.7PC was (cont'd) l 1 8 9 80 ST S "i poi".E n O1HE R SI A TUS ISC V Y DISCOVEHY DESCHIPTION Ii t

s 8 9 l El@ l 100 l 9 l 812l@l13 NA 44 l lBl@l 45 46 Periodic test 80 AC TIVI T Y CONTENT RELE ASED OF HEl.E ASE AMOUNT OF ACTIVITY - LOCATION OF RELEASE J

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{Zj @ lZl@l to 11 NA 44 l l 45 NA 80 l

PERSONNEL E XPOSUHES NUMREn TYPE DESCnPTION i 7 10 01 Ol@lE l@l NA l

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• NUYBEH DESCHIP TION 2gg i a 8 9 l0l0l0l@l 11 12 NA 80 l

L OSS OF OR DAM AGE TO F ACILITY '

TYPE DE SCHIP TION i 9 J @l NA 7006I40 3I4 80 l

8 9 to NA llj 2 o ISSUE LN @lDESCHIPTION l l 08 r2 ')

lll ll 80 ;;i R 9 to eer aP, n. o , A. C. To111 son, Jr. __ png,y 919-457-6701 2

IER CONTINUATION - RO# 1-79-37 Facility: BSEP Unit # Event Date May 15, 1979 revised to change the setpoint to 8.60 1 0.04 volts to allow a tolerance band on eithe: side of the setpoint.

2278 351 O

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