ML20009H626

LER 81-055/03L-0:on 810706,control Rod Did Not Have RTGB Position Indication or Full Out Indication.Caused by Failure to Tighten Rod Position Instrument to Probe Cable Connector. Connector Tightened & Rod Position Indications Normal

ML20009H626
Person / Time
Site:	Brunswick
Issue date:	07/28/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H615	List: ML20009H614 ML20009H626
References
LER-81-055-03L-01, LER-81-55-3L-1, NUDOCS 8108100302
Download: ML20009H626 (2)

Text

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PdRC FOHM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 771' ' '

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l0 l1l8 8 Nl Cl B l E l P] 141l@l15 0 l 0 l - l 0LICENSE l0l0 l 0 l 0 l - l 0 l250 l@l 4 UCENSE l 1 l 1TYPE l 1JOl 1 l@l l j@

57 CAT 68 NUMBER 26 7 9 LICENSEE CODE CON'T lolil $$v"n] l L j@l 0l 3 l 0 l - l 0 l 3 l 2 l 5 69@] 017 l 0 l 6 l 874 l 175l@l0l7l2181811l@

REPORT DATE 80 7 8 60 61 DOCKET NUMBER 68 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o l 2 l l During a reactor startup, it was discovered that control rod 22-07 did not have RTGB l l o l a l l Position indication at notch positions "44", "45", and "48" and did not have " full [

[ o l 4 l l out" indication on the RTGB or " full cut" position confirmation by the plant computer l

[Tls] l when the rod was fully withdrawn. This event did not affect the health and safety l l 0 l6 l l of the public. l l

l o 171 l 101811 Technical Specifications 3.1.3.7a, 6.9.1.9b [

7 8 9 DE CODE S SC E COMPONENT CODE SUBC O'E S ODE lo19l l Il Dj@ W@ l C l@ lI lN lS lT lR lU [ @ g @ W @

12 13 18 19 20 7 8 9 10 11 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR R EPORT NO. CODE TYPE No.

LE R/Ro b RE nu l8 l1 l (--J l0 l515 j y 27 l013l 28 29 lLl 30 l-l 31 l 0l 32

_ 21 22 23 24 26 K N A oN PL NT M HOURS SB IT D FOR h B. SUPPLIE MAN FACTURER

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43 l44 Gl 0l 8l 0l@47 33 34 35 36 31 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li lo l l During previous maintenance, the rod position instrument to probe cable connector I i i l was not sufficiently tightened to ensure proper signal transmission from these rod I g,i7l l position reed switches to the position instrumentation. The connector was properiv i lil3ll tightened and the rod position indications were found to be normal. All I&C l gl maintenance personnel will review this report. 80 I

7 8 9 ST S  % POWER oTHER STATUS ISCO RY DISCOVERY DESCRIPTION l1 l 5 l l_CJ@ l 0 l 0 l 4 l@l NA l [,A_j@l Operator Surveillance l ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 7

1 6 8 9 l Zl @ to

@l 11 NA .] 44 l

45 NA 80 l

PERSONNEL EXPOSURES NUY8ER TYPE DESCRIPTION n^ l i 7 LOI 01 Ol@lz l@l PERSONNE L INJURIES NUMBER DESCRIP flON l

7 1 a 8 9 l0l0l0l@l 11 12 NA 80 LOSS OF OH DAMAGE TO FACILITY TYPE DE SCRIPTION l

i 9 8

1 9.

zl@l10NA 80 7

NRC USE ONLY "ilESCRIP1QN 8 08100302 810728 ,

ISSU E llllllllllllly 7

2 o 8 9 hl 10 NA hDRADOCK05000 l

68 69 80 5 NAME OF Pr.EPARER M. J. Pastva. Jr- PHONE:

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LLR NITACliMENT - RO # 1-81-55 Facility: BSEP Unit No.1 Event Date: 07/06/81 This event ocrarred as a result of incomplete . maintenance, where following-repairs to the rod position indication system associated with rod 22-07, the rod probe to instrument cable connector was not sufficient ly tightened. This caused a loss of position indication at rod positions "44", '45", "48", and " full out" indication on the RTGB and the plant computer printout, ie- designed, the cable connector utilizes a clamp which prevents a visual check of the connector integrity after installation of the clamp. During the investigation of this event, it was revealed that the previous maintenance which led to this event had been performed without an LCO. As a result, an operability check was not performed to ensure the rod had been properly repaired. The failure to initiate j-~'

.an LCO on the problem worked during the maintenance which led to this event will be reported in LER 1-81-48. As a result of this event, all I&C maintenance personnel will review this report and the corrective actions required as a result of the failure to initiate an LCO will be outlined in LER 1-81-48.

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