ML20085G768

AO BFAO-7311W:on 730910,HPCI Quick Start Sys Failed.Caused by Missing Anchor Nut from Depressed End of Amplifier Receptacle.Missing Nut Replaced & New Flow Controller Installed

ML20085G768
Person / Time
Site:	Browns Ferry
Issue date:	09/20/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G770	List: ML20085G768 ML20085G776
References
AO-BFAO-7311W, NUDOCS 8308290345
Download: ML20085G768 (2)

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TENNESSEE VALLEY AUTHOAITY Mp I CHATTANOOGA, TENNESSEE il '

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Mr. Joha F. O'Icary, Director H t',

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U.S. Atomic Energy Commission /)ff%;f c ,/

Washington, DC 20545 'h8,, .

Dear Mr. O'Icary:

TENNESSEE VALLEY AUTHORITY - EBOWNS FERRY NUCIZAR PIANT UNIT 1 -

DOCKET H0 50-259 - FACILITY OPERATING LICE'ISE DPR ABUCEAL OCCURRENCE REPORT DFAO-7311W The purpose of this report is to provide details concerning the reported failure of an automatic quick start of unit 1 high pressure coolant injection (HPCI) system on September 10, 1973 This occurrence vac reported by telegram on the date of the failure to the Region II Directorate of Regulatory Operations, Atlanta, Georgia, c

D2scrintion of the Incident C c'

On September 10, 1973, during initial startup testing at 150 psig, the unit 1 HPCI cystem failed to reach rated speed and flow during a simulated automatic initiation (quick start). Immediately before this,HPCIdidachieve-ratedspeedandrequiredflowduringamanual/

automatic flow test. Since the cause of tae problem was not obvious, the reactor pressure was reduced below 122 psig to accommodate further investigation.

Invectigation and Corrective Action Inspection of the flow controller revealed a " cocked" cmplifier plug-in receptacle with one end depressed and disconnected from that portion of its mating emplifier plug. The cause was traced to.a missing anchor nut from the depressed end of the emplifier receptacle. When the miscing nut was replaced allowing proper mating of emplifier connections, the original flow controller successfully passed a bench performance test. A new flow controller with a properly mounted amplifier receptacle vac installed. After completing all necessary control adjustments, the HPCI system recponded correctly and delivered rated flow in lecs than 25 seconds. ,

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Mr. John F. O' Leary September 20, 1973 TEN:;ESSEE VALLEY AUTHORITY - EROWI!S FERRY IiUCIEAR PLM;T UNIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATII;G LICE:iSF: DPR ABNOMAI, OCCURIE: ICE REPO.Tf EFAO-7311W To prevent recurrence, a locking material cuch as "Icetite" retaining compound will be installed on all similar GE/13C controller receptacle fastener nuts. Thic work will be completed within 30 daye.

Very truly yours, .

TENNESSEU VALLEY AUTHORITY

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E. F. Thomas Director of Power Production CC: Mr. C!orman C. Moseley, Director Region II Regulatory Operations Office, US/IC 230 Peachtree Street, NW Atlanta, Georgia 30303 (.

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