ML18039A302

Forwards LER 98-001-00 Which Provides Details Concerning Issue That Was Discovered by Util While Performing Analysis in Support of 5% Power Uprate License Amend

ML18039A302
Person / Time
Site:	Browns Ferry
Issue date:	04/01/1998
From:	CRANE C M TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18039A303	List: ML18039A302 ML18039A305
References
NUDOCS 9804090267
Download: ML18039A302 (6)

Text

CATEGORY1 REGULATORY INFORMATION DISTRIBUTION SYSTEM (RZDS)ACCESSION NBR:9804090267 DOC.DATE: 98/04/01 NOTARIZED:

NO FACIL:50-296 Browns Ferry Nuclear Power Station, Unit 3, Tennessee AUTH.NAME'UTHOR AFFILZATION CRANE,C.M Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Forwards LER-98-01-00 re voluntary rept provides details concerning issue that discovered by util while performing analysis in support of 5>power uprate license amend.DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR

)ENCL (SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.NOTES: DOCKET¹05000296 RECIPIENT ID CODE/NAME PD2-3-PD INTERNAL: ACRS AEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HZCB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL: L ST LOBBY WARD NOAC POORE,W.NRC PDR COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RECIPIENT 1D CODE/NAME DEAGAZIO,A FILE CE R DE/EELB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN2 FILE 01 LITCO BRYCE,J H NOAC QUEENER,DS NUDOCS FULL TXT COPIES LTTR ENCL 1 1 2 2 1 1 1 1'1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 R Y D E N NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE.TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS'R REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL 25 0 lj L I.

Tennessee Valley Authority.

Post Office Box 2000, Decatur, Alabama 35609-2000 Christopher M.(Chris)Crane Vice President.

Browns Feny Nuclear Pant April 1, 1998 U.S.Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.20555

Dear Sir:

10 CFR 50.73 BROWNS FERRY NUCLEAR PLANT (BFN)UN I TS 1 r 2 r AND 3 DOCKET NOS 50 259 r 260 r AND 296 FACILI TY OPERATING LICENSE DPR-33, 52, AND 68-LICENSEE EVENT REPORT (LER)50-296/98001 The enclosed voluntary report provides details concerning an issue that was discovered by TVA while performing analysis in support of a 5 percent power uprate license amendment.

Through utilization of a different computer code than the current licensed basis for environmental qualification of equipment, TVA's computer modeling indicated that certain sensors may not detect all pipe breaks.On January 21, 1998, TVA made an Emergency Notification System one hour Non-Emergency telephone call to the NRC operations center, notifying them of an event that resulted in a nuclear power plant being in an unanalyzed condition that significantly compromised plant safety.Further review determined that an unanalyzed condition significantly compromising safety did not exist and TVA subsequently withdrew the one-hour notification.

98040902b7 980 029b PDR ADOCK 0500029b S P.DR

U.S Nuclear Regulatory Commission Page 2 April 1, 1998 TVA is providing this voluntary report to inform others under what circumstances existing computer models may provide, different results..There are no commitments contained in this report.Sincerely, C.M.rane Enclos cc (Enclosure):

MR.Albert De Agazio, Project Manager U.S.Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr.Mark S.Lesser, Branch Chief U.S.Nuclear Regulatory Commission Region II 61 Forsyth Street, S.W.Suite 23T85 Atlanta, Georgia 30303 NRC Resident Inspector Browns Ferry Nuclear Plant 10833 Shaw Road Athens, Alabama 35611 Cl~c