ML18038B707

Forwards LER 96-005-00 Re Unit 2 Automatic Scram on Low Reactor Water Level Occurred

ML18038B707
Person / Time
Site:	Browns Ferry
Issue date:	06/10/1996
From:	Machon R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18038B708	List: ML18038B707 ML18038B709
References
NUDOCS 9606140069
Download: ML18038B707 (6)

Text

'REGULRT( ZNFORMRTION DZSTRZBUTZONOSTEN (RIDE) g'ACCESSION NBR:9606140069 DOC.'DATE: 96/06/10 NOTARIZED: NO DOCKET FACIL:50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 AUTH. NAME AUTHOR AFFILIATION MACHON,R.D. Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Forwards LER 96-005-00 re Unit 2 automatic scram on low reactor water level occurred. C DISTRIBUTION CODE: ZE22T COPIES RECEIVED:LTR I ENCL i SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.

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NOTES:

RECIPIENT COPIES RECIPIENT COPIES ZD CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-3-PD 1 1 WILLIAMSFJ. 1 1 0

INTERNAL: ACRS 1 1 AECCJ~Q/RAB 2 2 AEOD/SPD/RRAB 1 1 ILE CENTI 1 1 NRR/DE/ECGB 1 1 N 1 1 NRR/DE/EMEB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRCH/HQMB 1 1 NRR/DRPM/PECB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 1 EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 NOAC MURPHYFG.A 1 1 NOAC POOREFW. 1 1 D NRC PDR 1 1 NUDOCS FULL TXT 1 1 0

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NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTETH CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN SD-5(EXT. 415-2083) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEEDt FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 26

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Tennessee Vat~ey Autttonty, Post Office Box 2000, Decatur. Afabarna 35609.2000 R. D. (Rick) Machon Vice President, Brovms Ferry Ruder Rant June 10, 1996 U.S. Nuclear Regulatory Commission 10 CFR '50.73 ATTN: Document Control Desk Washington, D.C. 20555

Dear Sir:

BROWNS FERRY NUCLEAR PLANT (BFN)i - UNITS 1q 2q AND 3 - DOCKET NOS ~ 50-259~'50-260'ND 50-296 FACILITY OPERATING LICENSE DPR-33~ '52~ AND 68 - LICENSEE EVENT REPORT 50-260/96005 The enclosed report provides details concerning the Unit 2 automatic scram on low reactor water level which occurred on May 10, 1996. The low. water level resulted from a runback of two of the three, reactor feedwater pumps which unexpectedly occurred while software parameter changes were being made in the digital feedwater control system. When the software parameter changes were made active in the control system, an initialization sequence occurred which drove the feed pump speed demand signal to zero, and an automatic scram was initiated on low water level. During,the transient, the Reactor Core Isolation Cooling turbine tripped on high exhaust pressure.

This report is submitted in accordance with,10 CFR 50.73 (a)(2)(iv) as .a condition that resulted in manual or automatic actuation of engineered safety features and 10 CFR 50.73(a)(2)(i)(B),as a condition prohibited by the plant's technical specifications.

Sincerely, R. D. chon Enclosure cc: See page 2 3.40020 960bi40069'60610 PDR'DOCK,05000260 S PDR

II I+I U.S. Nuclear Regulatory Commission Page,2 June 10, 1996

Enclosure cc (Enclosure):

INPO Records Center Suite 1500 1100,Circle 75 Parkway Atlanta, Georgia 30339 Paul Krippner American Nuclear Insurers Town Center, Suite 300S 29 South Main Street West Hartford,, Connecticut 06107 Mr. Mark S., Lesser, Branch Chief U.S. Nuclear Regulatory Commission Region 101 II Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611 Mr. J. F. Williams, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852

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