ML20085G956

Updated AO BFAO-50-259/7453W Re Loss of Position Indication on Suppression Chamber to Drywell Vacuum Breakers.Electrical Checks in Torus Suppression Chamber Showed Grounded Conductors in Inside Torus Penetration Connector

ML20085G956
Person / Time
Site:	Browns Ferry
Issue date:	01/17/1975
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E Office of Nuclear Reactor Regulation
Shared Package
ML20085G957	List: ML20085G956 ML20085G962 ML20085G969
References
NUDOCS 8308290540
Download: ML20085G956 (2)

Text

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Q O TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 574ol ,,..-

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{9 c . g,?e d .Y .y"' ',h Mr. Edson G. Case 9 k.y S" Acting Director of Licensing -

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Office of Regulation ,. .

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U.S. Ato=ic Energy Co==ission Washington, DC 20545

Dear Mr. Case:

TEIRIESSEE VAIlff AUTHORITY - BROMIS FERRY UUCLEAR PL/JIT UNIT 1 -

DOCiGT HO. 50-259 - FACILITY OPERATING LICEITSE DPR ABNORMAL OCCURREIICE REPORT BFA0-50-259/7453W Abnor=alOccurrenceReportBFAO-50-259/7453Wsubmittedwithnyletter of October 17, 1974, made a en mit= cat to provide additional infor-nation when the cause of failure was determined. The enclosed report fulfills this co==it=ent.

Ver/' truly yours, TENNESSEE VALLEY AUTHORITY

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/ E. P. Thomas Director of Power Production Enclosure CC (Enclosure): -

Mr. Ifortan C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street,IiW., Suite 818

-Atlanta, Georgia 30303 du 6

8308290540 750117 PDR ADOCK 05000259 S PDR 802

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O O ABIORbML OCCURRENCE REPORT Report No.: BFAO-50-259/7453W(FollowupReport)

Report Date: January 17, 1975 Facility: Browns Ferry nuclear Plant unit 1 Designation of Annarent Cause of Occurrence On November 20, 1974, entry was made into the torus suppression chamber. .

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Electrical checks showed the cause of the failure to be grounded conductors in the inside torus penetration connector for valve 1-FCV-64-28M.

Corrective Action The grounded connector was disconnected and the wiring was routed to a spare penetration connector.

Failure Data There are no known failures of this type of connector before this time.

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