ML18283B411

LER 1978-003-00 for Browns Ferry Nuclear Plant, Unit 3, Valve FCV 3-74-52 Was Found Inoperable During Performance of Surveillance Instruction 4.5.B.1.C

ML18283B411
Person / Time
Site:	Browns Ferry
Issue date:	03/10/1978
From:	Fox H Tennessee Valley Authority
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
LER 1978-003-00
Download: ML18283B411 (8)

Text

~P py (i>/'9REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS>DISTRIBUTION FOR INCOMING MATERIAL 50-29b REC: OREILLY J P NRC ORG: FOX H S TN VALLEY AUTH DOCDATE: 03/10/78 DATE RCVD: 03/14/78 DOCTYPE: LETTER NOTARIZED:

NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 LICENSEE EVENT REPT (RO 50-296/78-03>

ON 02/13/78 CONCERNING DURING PERFORMANCE OF SI 4.5.B.i.Ci VALVE FCV 3-74-52 WAS FOUND INOPERABLE.

PLANT NAME:BROWNS FERRY-UNIT 3 REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL: Q4r DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS (DISTRIBUTION CODE A002>FOR ACTION: INTERNAL: EXTERNAL: BR CHIEF LEAR++W/4 ENCL r E~~W/ENCL E%%SCHROEDER/IPPOL ITO++W/ENCL NOVAK/CHECK44W/ENCL KNI GHT++M/ENCL HANAUER4+W/ENCL E I SENHUT4+W/ENCL SHAO++W/ENCL KREGER/J.COLLINS++W/ENCL K SEYFR IT/I E++W/ENCL LPDR S ATHENS)AL+%W/ENCL T I C++W/ENCL NS I C++W/ENCL ACRS CAT B++W/ib ENCL NRC PDR++W/ENCL MIPC+4W/3 ENCL HOUSTON++W/ENCL GR IMES+4 W/ENCL BUTLER++W/ENCL TEDESCO+4W/ENCL BAER++W/ENCL VOLLMER/BUNCH++M/ENCL ROSA++W/ENCL DISTRIBUTION:

LTR 45 ENCL 45 SIZE: iP+iP+iP THE END CONTROL NBR: 780740018

~~+e E h MAR 10 I978 Mr.James P.0'lly,.Director U.S, Nuclear latory Commission Office of Ins ection and Enforcement Region II 230 Peacht e Street, NW., Suite 1217 Atlanta, orgia 30303 j~!',",I!',i!'

TENNESSEE VALLEY ALITHOAITY cHATTANooGA.'ENNEssEE 37401 j))4if"j-'~ctq 4roptr~l~,(4%'ear Mr.'Reilly: N.TENNESSEE VALLEY AUTHORITY-BROWNS PERRY NUCLEAR PLANT UNIT 3-DOCKET NO.50>>296-FACILITY OPERATING LICENSE DPR&8-REPORTABLE OCCURRENCE REPORT BPRO-50-296/783 The enclosed report provides details concerning valve PCV 3-74-52 which was found inopexable during the performance of Surveillance Instruction 4'.5.B.l.c'.

This report is submitted in accordance with Browns Perry unit 3 Technical Specification 6.7.2.b.(2),.

Very truly yours, TENNESSEE VALLEY AUTHORITY H'.Pox Dixector of Power Production Enclosure cc (Enclosure)s Director (3)Office of Management Informatio and Program Control.U.S.Nuclear Regulatory Commiss n Washington, DC 20555 Director (40)Office of Inspection and Enforcement U.S.Nucleax Regulatory Commission Washington, DC 20555 I ab t An Equal Opportunity Employer 0'c~Mppjj.pp"qe$S$y e i-i<g f~i(g,.",t1[j('~bg;Y>f))>gQ-'if~f/','1P'~>~,'J]lj".,~

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This is reported under Technical Specification

.6.7.2.b.2.within 4 days.Redundant systems were operable during this period.Similar~o 4 Re air work was be un immediatel and the valve was restored to o erabilit~o 6 oc ur ences have been reviousl e orted on BFAO-50-260 7435 and~o 2 BFRO-50-259/7711.

There were no effects upon public health or safety.~QB 1 6 9~OB 2 6 SYSTf M CAUSE CAUSE COMP, VALV f COOK CODE SUBCQDK COMPONENT CODE SUBCQOE SVBCQOf s>>rs>>'Js o>>>>e>>sos Bus'ws 9 10 11 12 ll 16 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION Lf R/RO EVENT YEAR REPORT NQ.CODE TYPE NO.Qo erroor~78~~00 3~W~03~I~~0 21 22 21 24 26 21 26 29 lp ll l2 ACTION FVTURK EFFECT SHUTDOWN ATTACHLIE'CT IrSAD4 PRIME COMP.COMPONE NT TAKEN ACTION ONPLANT hlETHOD HQVRS Q22 SUBMITTED FOAM EUB.SUPPLIE R ereAIeUFACTVAKR roS>>'JS ooS LJS~>>oo ooS LJS~S SS 26 31 Sp 41 43 44 41 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS 021 o The valve is a 24" Walworth Co.ressure sea an le valve with a Limitor ue SMB-5T o erator.The valve.was disassembled and found that the u er bearin locknut h r dana ed the oke its normal o t bearin s and N/A.NAME OF PREPARER 4 scorin n The dana ed ITYdone on the yoke.STATUS N POWER OTHER STATVS QSO OISCQ~VERY e~EQre~10 0 Qre N A~BQel 2 6 9 IP I'2 Il 46 ACTIVITY CONTf NT RELEASFD OF RELf ASK AMOUNT OF ACTIVITY Q o~Z 03~Z034 N/A 1 6 9 10 I I 44 46~ERSQNNf 1 EXPOSURES NUMBER TYPE OKSCRIPTIONQ39

~oo o Q>>z PQe 2 6 9 11'I'1 ll~ERSONNEL INJURIES 2 6 9 11 12 LOSS OF QR OAMAG'E TO FACILITY Q43 TYPE Of SCRIPTION~Z042 2 6 9 10 PUB LI C I T Y I~SUE 0 Df SCReP TION Q~2Q~NQI4 N A~9 10 machinin DISCOVERY OESCRIPTIQN Q32 N A LOCATION OF RELEASE QB N/A NRC USE ONLY PHONE:*Revi sion.

~f

.Attachment BFRO-50-296/783.

.CAUSE DESCRIPTION AND CORRECTIVE ACTION (Continued)

Th'e valve was a 24" Walworth Co.pressure seal angle valve with a Limitorque SHB-5T operator.The valve was disassembled,and it was found that the upper bearing locknut had been'stripped from its normal position with the upper bearing locknut, set screws still in place.This also damaged the yoke nut, the, upper and lower bearings, and caused some scoring on the yoke.As a result of this damage there was binding causing the valve stem to become 4 immovable.

All the damaged parts were replaced, a small amount of machining work was done on the yoke, and the valve was reassembled.

It is not known r what exerted the excessive force on the upper bearing locknut..Two t probable causes of failure are that the valve at some time was stuck in'he closed position and was damaged when an attempt was made to open it or that it traveled past the backseated position.HLA: SGS 3/8/78 r~e,'b 4~h(~>i~I 1~