ML20085G668

Followup Rept of AO BFAO-50-260/7432W:on 741204,shutdown Cooling Flow Control Valve FCV-74-66 Failed to Allow Waterflow Passage.Caused by Broken Tack Welds.Welds Ground Off & Large Fillet Welds Rewelded

ML20085G668
Person / Time
Site:	Browns Ferry
Issue date:	02/19/1975
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E Office of Nuclear Reactor Regulation
Shared Package
ML20085G647	List: ML20085G661 ML20085G668 ML20085G683
References
NUDOCS 8308290274
Download: ML20085G668 (4)

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- ABUORMALObCURRENCEHSPORT Report No.: BFAo-50-260/7432W(FollowupReport)

Report Date: February 19, 1975 Occurrence Date: Decenber 4,1974 Facility: Brouns Ferry Huelcar Plant unit 2

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Designation of Apparent Cause of Occurrence RefertoAbnornalOccurrenceReportDFAo-50-260/7432W.

Corrective Action ,

All valves in similar positions en both units 1 and 2 to the failed valve reported in the subject abnor-21 occurrence report have subsequently been

.disassenbled, inspected, and repaired. The tack welds were found broken on all three valves. 'rne disc had rotated appro.xinately tuo inches and one inch circu .fcrentially on valves 74-66 and 74-52, respectiva:ly, on unit 1.

The disc htd not rotated on 7h-52 on unit 2. i l'

Repairs were nade by grindins off the broken tach ucids and rewelding with large fillet velds in accordance with approved instructions.

Valve Data

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F.anufacturer '..'alworth Congeny, Greensbur63 PA 24" pressure seal angle globe vd.ve with limitorque operator.

WalworthCoganydrawingA-1233I-mi-E .

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8308290274 750425 PDR ADOCK 05000260 S PDR l

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O TENNESSEE VALLEY AUTHORITY CH ATTANOOGA TCNNCSSCE 374ol hk;D.\

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'IYdN b February 19, 1975 l t (; .{vL\ i ' '}

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x Mr. Edson G. Case vM. ,'f , ' .-N Acting Director of Licensing \( . .~".[ 4 . ;,' g '. . ' g.

U.S. liuclcar Regulatory Conmission Washington, DC 20545

Dear l'r. Case:

TEli!ESSEE VALLEY AUTHORITY - BRO'.CS FERilY UUCIEAR plt. lit UNIT 2 -

DOCET I:0. 50-260 - FACILITY OPERATING LICEUSE DPR AB'IOR!'AL OCCURREiOE REPORT BFAO-50-260/7432W -

The enclosed zeport is to provide a followup on the inspection of valves in similar positions on both units 1 and 2 as the flow control valve ifnich failed on December 4,1974 The failure in December was reported by Abnor-1_ Occurrence Report BFAO-50-260/7432W tranceitted

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very wu g yours, TEti1ESSEE VAILEY AUTHORITI i

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E. F. Thomas Director of Power Production Enclosure '

CC (Enclosure):

Mr. Hornan C. I'oseley, Director U.S. I;uclcar Ect;ulator/' Coc:d.ssion Regional Office 230 Peachtree Street, NW., Suite G18 Atlanta, Georgia 30303 2052

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- ABRORMAL OCCURRE:!CE REPORT Report No.: BFAO-50-260/7432W(FollowupReport)

Report D, ate: February 19, 1975 Occurrence Date: December h, 1974 Facility: Browns Ferry Huelcar Plant unit 2 Designation of Apuarent Cause of Occurrence Refer to Abnormal Occurrence Report BFAO-50-260/7432W.

Corrective Action All valves in similar positions on both units 1 and 2 to the failed valve reported in the subject abnor-n1 occurrence report have subsequently been

.disassc= bled, inspected, and epaired. The tack welds were found broken on all three valves. The dise had roteted approximately two inches and one inch circunferentin11y on valves 74-66 and 7h-52, respectively, on unit 1.

The disc hcd not rotated en 7b-52 on unit 2.

Repairs were made by Srinding off the broken tach welds and rowelding with large fillet welds in accordance with approved instructions.

Valve Data 1/.anufacturer - Walworth Ccepany, Greensbur63 FA 24" pressure seal angle ;;1obe valve with limitorque operator.

Uclworth Company drawing A-12337'-10i-E ,

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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ot g,l rs ]

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February 19, 1975 .

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> tz ' l Mr. Edson G. Case \. s Acting Director of Licensing ',- ,2 7 T. .] p(\'?

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U.S. Nuclear Regulatory Cor::nission

. Washington, DC 20545

Dear Fr. Case:

THUIESSEE VALLEY AUTHORITY - BRO'<TJS FERRY NUCLEAR PLANT UNIT 2 -

DOCIGT NO. 50-260 - FACILITY OPERATING LICE;;SE DPR ABNORF1.L OCCURREICE REPORT BFAO-50-260/7432W The enclosed report is to provide a followup on the inspection of valves in similar positions on both units 1 and 2 as the flow control valve which failed on December 4,1974. The failure in December was reportedbyAbnormalOccurrenceReportSFAO-50-260/7432Wtransmitted by letter of December 13, 1974 Very Tzaq yours, TCE!ESSEE VALLEY AUTHORITY .

E. F. Tho=as Director of Power Production Enclosure CC (Enclosure):

Mr. Norman C. Ibseley, Director U.S. Nuclear Regalatory Cor::nission Regional Office 230 Feachtrec-Street, NW., Suite 818 Atlanta, Georgia 30303 I

i V 2052 LL -

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