ML18283B011

LER 1976-08W-00 for Browns Ferry Unit 2, Neutron Monitoring Battery 2A Was Made Inoperable When Connector Was Accidentally Broken Off Cell Post During Routine Cleaning & Is Submitted in Accordance with Appendix E to Regulatory Guide 1.16, R

ML18283B011
Person / Time
Site:	Browns Ferry
Issue date:	07/26/1976
From:	Fox H Tennessee Valley Authority
To:	Moseley N NRC/RGN-II
References
LER 1976-08W-00
Download: ML18283B011 (6)

Text

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~~~~~~~~~~~~~egg ENCLOSURE/.i LICENSEE EVENT REPORT 50<<260768 ON 7-9-76....

REF BATTERY BECAME INOPERABLE WHEN A CONNECTOR'WAS ACCIDENTALLY BROKEN OFF A CELL POSTo~~~~~~~~~~~~~~~t gf gg~.PLANT NAIIE: iL+4~NOTE: XF PERSONNEL EXPOSURE XS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS NCH CH EF'3 CYS FOR A Oi IC~ASST,: W/CYS ACRS CYS HOLDING SE FOR ACTION/I NFORMATION-nW c.4Q-T TO LA REG FIL INTERNAL D IST Rl BUTION I&E 2 SCHROEDER/XPPOLITO P NOUS O NOVAK/CHECK GRIMES CASE~HANAUER/TEDESCO HACCARY w EISENHUT r BAER SHAO r VOLLHER HUNCH'GER/J COLLINS.PDR: XC: S~EXTERNAL DISTRIBUTION CONTROL NUMBER NAC FOAM IOO I2.7G

~0 I I~u I~~~~~I F I I ut OOII~I I I 0 TENNESSEE VALLEY AUTHORITY GHATTANQQGQ.

TENbfEssEE 37401 Ecf(gfg 8'-]~Qgg~~~lag~~gg~~l S~July 26, 1976 Mr.Norman C.Moseley, Director c'.S.Nuclear RegiLatory Cormission Office of Inspection and.Enforcement Region II 230 Peachtree Street, NW., 8th Floor tt~RUIGIO<J DOC>(et F)Je Atlanta>Georgia 30303

Dear Mr.Moseley:

The enclosed report is to provide details concerning neutron monitoring battery,:2A which was made inoperable when a connector was accidentally broken off a cell post during a routine cleaning and, is submitted in accordance with Appendix E to Regulatory Guide 1.16, Revision 4, August 1975.This event occurred.on Browns Ferry Nuclear Plant unit 2.Very truly yours, TENNESSEE VALLEY UTHORITY~cd H.S.Fox Director of Power Production TENNESSEE VAIZZY AUTHORITY-BROWNS FERRY NUCLEAR PIANT UNIT 2-DOCKET NO.50-260-FACILITY OPERATING LICENSE DPR-52-REPORTABLE OCCURRENCE REPORT BFRO-50-260/768W Enclosure (3)CC (Enclosure):

Director (3)Office of Management Information and, Program Control U.S.Nuclear Regulatory Commission Washington, D.C.20555 Director (40)Office of Inspection and Enforcement U.S.Nuclear Regulatory Commission Washington, D.C.20555 An Equal Opportunity Employer H HH%Il.'v S H H~~~H~~

4/~(('ENBEE EVENT REPORT 4 CONTROL BL I.ICENSEE NAME Q01 A L B 7 89[PLEA8E PRINT ALL REQUIAEO INFOAIHATIOTII) 1 6 LICENSE EVENT LICENSE NUM~'-4)TYPE TYPE 0 0 0 0 0 0 0 0 0 4 1 1 1 1.~01 14 15 85 26 30 31 38 REPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER EVENT OATE REPORT OATE[gg~jppN7~a*2 L 0 5 0-0 2 6 0 0 7 0 9 7 6 7 8 57 58 59 60 61 68 69 74 75 EVENT DESCRIPTION

[oO~J Durin a routine cleanin of the neutron monitorin battery 2A, the battery was made 7 8 9 I ino erable when a connector was accidentall broken off a cell ost.Althou h all 7 8 9[OD4)rods were alread full inserted this resulted in a loss of SRM channels A and C 7 8 9 (g and initiated a reactor scram si nal BFRO-50-260/768 7 8 9[oaf 80 80 80 80 80 7 8 9 SYSTEM CAUSE CODE COBE COMPONENT CODE[OD77~BC E 0 A 2 R Y 7 8 9 10 11 18 17 CAUSE DESCRIPTION Qg A C and D batteries model 3DCU-7 7 8 9[OD9)PRM E COMPONENT SUPRA LNI Cl73~V 44 47 48 had a cable connector break off of a cell ost.0 e l c d w t a ew ba t 80 80 OTHER STATUS N/A AMOUNT'F ACTIVITY 7 89 7 8 9~10 7 89 FACILITY STATUS 96 POWER pig 0~oo 0 7 8 9 10 18 13 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE Q~g a a N/A 7 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~(0~OO O 0 7 89 11 18 13 PERSONNEL IN JURIES NUMBER DESCRIPTION

~4~oo o 7 89 11 18 OFFSITE CONSEQUENCES Q~g 7 8 9 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION Q]~s 7 89 10 PUBLICITY METHOO OF 06COVERY B 44 45 46 44 45 N/A N/A N A N/A N/A OISCOVERY OESCRIPTION N/A LOCATION OF RELEASE N/A 80 80 80 80 80 80 80 80 80 ADDITIONAL FACTORS~18 7 89 7 89 NAME: N/A ale/~)N/A PHONE: 80 80 cpo eel~eev qQf gal%pe P~A I u