ML18283B405

LER 1978-005-00 for Browns Ferry Nuclear Plant, Unit 3, Six CRD Accumulator Level Switches Which Would Not Alarm with Level Increases During Plant Operation While Performing Electrical Maintenance Instruction 50

ML18283B405
Person / Time
Site:	Browns Ferry
Issue date:	04/04/1978
From:	Fox H Tennessee Valley Authority
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
LER 1978-005-00
Download: ML18283B405 (6)

Text

a j Ept~t yf(IP(+g 'g REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-296 REC: ORElLLY J P ORG: FOX H S DOCDATE: 04/04/78 NRC TN VALLEY AUTH DATE RCVD: 04/11/7(

DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 FORWARDING LICENSEE EVENT REPT (RO 50-296/78-005)"ON 03/07/78 CQNCERNING DURING PLANT OPERATION WHILE PERFORMING EMI-50'IX CRD ACCUMULATOR LEVEL SWITCHES WOULD NOT ALARM WITH LEVEL INCREASES DUE DIRT ON SWITCH FRONT PREVENTING LEVEL SWITCHES FROM OPER PLANT NAME:BRQWNS FERRY UNIT 3 REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL:~

DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS (DISTRIBUTION CODE A002)

FOR ACTION: BR AR~~~~W/4 ENCL INTERNAL: REG FILE4HIW/ENCL NRC PDR++W/ENCL MIPC44W/3 ENCL SCHROEDER/I PPOL I TO++A/ENCL HOUSTON++W/ENCL NOVAK/CHECK4~~~W/ ENCL EEB++WfENCL KNIGHT~~4~W/ENCL BUTLER+>W/ENCL HANAUER~~~W/ENCL TEDESC04~+W/ENCL EI SENHUT+4I W/ENCL BAER++W/ENCL SHAQ~~~~WlENCL VOLLMER/BUNCH++W/ENCL KREGER/J. COLLINS~~~W/ENCL ROSA++W/ENCL K SEYFR IT/IE4~+WfENCL EXTERNAL: LPDR S ATHENS'L++W/ENCL TI C+%W/ ENCL NS I C++W/ENCL ACRS CAT B4+Wf 16 ENCL COPIES NOT SUB)iITTED PER REGULATORY GUIDE 10 ~ 1 DISTRIBUTION: LTR 45 ENCL 45 CONTROL NBR: 781020031 SIZE: iP+1P THE END

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TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37401 PPR 4 19l8 Hr. Jarms P. eilly, Directox I/Igpss glpiI((%I'I5. IsIIli ~

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<<rn n B Dear Hr. O'R ll CA TENNESSEE VALL Y AUTHORITY - SROHNS PERRY NUCLEAR PLNT UNIT 3-DOCKET NO. 50 96 FACILITY OPEBAT INC LICENSE DPR<<68 REPORTASLE OCCURRENCE REPORT SPRO-50'296/785 The enclosed report provides details concerning six CRD accumulator level machos Mich cauld not alaaa vith levcQ. iacreaoes during plant operation Uhilo perforniag Electrical maintenance Instruction 50. This report io subaitted in accordance eith Brome Perry unit 3 Technical Specification 6.7.2.b (2),

'ery truly youxs, TENNESSEE VALLEY AUTHORITY II, S. Pox Director of Prox'roduction Enclosure (3) cc (Enclosure)!

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14 15 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES Qlo urin lant o switches would not alarm with level increases.

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exfstedl on BFRO-50-259/7725.

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eration while erformin EHI-50 six There are no redundant systems.

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!.ICENSEE EVENT REPORT Ql LIOENsE NUMNER 66 No 69 IPLEAEE PRINT DR TYPE EVENT DATE 26 Technical 14 CRD LICENSE TYPE 15 hazard to the ublic health or safet S

Previous occurrence~ was.reported

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TAKEN ACT(CN ON PLANT METHOD HOUAS Q22 SUSSUTTED PORS'I SUB. SUPl'LIEA MANUFACTURER

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' LRSLJS. LJS 22 24 25 LES QOLRO40 LJS L$ $ LNS 26 41 42 42 LJmWIS 44 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS Q27 irt on the switch front prevented the level switches from o eratin .

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All'ured by GEMS, Inc. General Electric Part No. 117C1434P1. The level will be functionall c ecke dur n e e unit's 4 refueling outa e.

7 4 9 fSTATuS ACILITY

'1POWER OTHER STATuS Q METHOD OF DISCOVERY

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~B Q31 Electrical DISCOVERY DKSCAIPTION Q32 Maintenance Instruction ACTIVITY CONTENT RELEASED OF AELEASK AMOUNTOF ACTIVITYQSS LOCATIONOF RELEASE Q jQg 7 4

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Q ~aQ34 10 11 N/A 44 N A PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION QSB R ~00 OQR' QRR N A Ti 4 9 11

~ ERSONNEL INJURIES 12 I2 9 11 '12 LOSS OF OA DAMAGE To fACILITY

'TYPE DESCRIPTION Q43 B ~aQ47 N/A 7 6 9 10 PUSLICITY NRC USE ONLY O ~5@<<' N/A 4 9 10 64 69

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