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

NRC FORM 195 U.S. NUCLEAR RFGULATORV C SS ION DOCKET NUMOER 12.7G) -Rbo FILE NUMBER NRC DISTRIBUTION FDR PART 50 DOCKET MATERIAL XNCXDENT REPORT FROM: TVA DATE OF DOCUMENT m N C mSELEY TENN 1-ib- l4 CHATTANOOGA H S FOX DATE RECEIVED LETTER 0 NOTOR IZ E D PROP INPUT FORM NUMBER OF COPIES RECEIVED ORIGINAL UNCLASSIFIED C3COPV ) Wig~

DESCRIPTION ENCLOSURE /.i LTR TRANS THE FOLLOWINGe ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ LICENSEE EVENT REPORT 50<<260768 ON 7-9-76.... REF BATTERY BECAME INOPERABLE WHEN A CONNECTOR 'WAS ACCIDENTALLY BROKEN egg OFF A CELL POSTo ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

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PLANT NAIIE: iL+4 ~ NOTE: XF PERSONNEL EXPOSURE XS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION NCH CH EF' -nW 3 CYS FOR A Oi IC ~ ASST,: c. 4Q-W/ CYS ACRS CYS HOLDING SE T TO LA INTERNAL D IST Rl BUTION REG FIL I &E 2 SCHROEDER/XPPOLITO P NOUS O NOVAK/CHECK GRIMES CASE

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0 TENNESSEE VALLEY AUTHORITY GHATTANQQGQ. TENbfEssEE 37401 Ecf(gfg July 26, 1976 8'-]~

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Mr. Norman C. Moseley, Director Nuclear RegiLatory Cormission c'.S.

Office of Inspection and. Enforcement ~l S~

Region II tt~RUIGIO<J DOC>(et F)Je 230 Peachtree Street, NW., 8th Floor Atlanta> Georgia 30303

Dear Mr. Moseley:

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 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 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

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[PLEA8E PRINT ALL REQUIAEO INFOAIHATIOTII) 1 6 I.ICENSEE LICENSE EVENT NAME LICENSE NUM~' -

4) TYPE TYPE Q01 A L B 0 0 0 0 0 0 0 0 0 4 1 1 1 1 .~01 7 89 14 15 85 26 30 31 38 REPORT REPORT CATEGORY 7

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~a*58 57 TYPE 2

SOURCE L 0 5 OOCKET NUMBER 0 0 2 6 0 0 7 EVENT OATE 0 9 7 6 REPORT OATE 59 60 61 68 69 74 75 80 I

EVENT DESCRIPTION

[oO~J Durin a routine cleanin of the neutron monitorin battery 2A, the battery was made 7 8 9 80 7 8 9 ino erable when a connector was accidentall broken off a cell ost. Althou h all 80

[OD4) rods were alread full inserted this resulted in a loss of SRM channels A and C 7 8 9 80 (g8 9 and 7

initiated a reactor scram si nal BFRO-50-260/768 80

[oaf 7 8 9 PRM E 80 SYSTEM CAUSE Cl73~V COMPONENT CODE COBE COMPONENT CODE SUPRA

[OD77 ~BC E 0 A 2 R Y LNI 7 8 9 10 11 18 17 44 47 48 CAUSE DESCRIPTION Qg A C and D batteries model 3DCU-7 had a cable connector break off of a cell ost.

7 8 9 80 7

[OD9) 8 9 0 e l c d w t a ew ba t 80

~10 7 89 80 FACILITY METHOO OF STATUS 96 POWER OTHER STATUS 06COVERY OISCOVERY OESCRIPTION pig 7

0 ~oo 0 N/A B N/A 8 9 10 18 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT'F ACTIVITY LOCATION OF RELEASE Q~g a a N/A N/A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~(0 ~OO O 0 N/A 7 89 11 18 13 80 PERSONNEL INJURIES NUMBER DESCRIPTION

~4 ~oo o N/A 7 89 11 18 80 OFFSITE CONSEQUENCES Q~g N A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION 7

Q]89~s 10 N/A 80 PUBLICITY N/A 7 89 80 ADDITIONAL FACTORS

~18 N/A 7 89 ale/ 80

~)N/A 7 89 80 NAME: PHONE:

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