ML20084H472

AOs BFAO-50-260/747W & BFAO-50-260/741OW:on 740814 & 21, Valves FCV 1-52 & FCV 1-27 to Steamlines D & B,Respectively, Failed to Open.Other MSIVs Tested & Appear Fully Operational

ML20084H472
Person / Time
Site:	Browns Ferry, 05002607
Issue date:	08/23/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084H462	List: ML20084H464 ML20084H470 ML20084H472 ML20084H474
References
NUDOCS 8305040309
Download: ML20084H472 (1)

Text

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b TENNESSEE VALLEY AUTHOFtlTY !"~~T1T // / >;1 T CHATTANOOGA, TENNESSEE :{

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Dear Mr. O' Leary:

TENNESSEE VALLEY AUTHORITY - BROES FERRY HUCLEAR FIANT UNIT 2 -

DOCKET NO. 50-260 - FACILITY OPIRATII!G LICEESE DFR ABNOP.FAL OCCURRENCE REECRTS BFAO-50-260/747ki AI!D BFAO-50-260/741CW This is an interim report until details are available concerning the cauce of failure ar_d ccrrective actica taken as a result of tuo n in stec~

isolation valves which were sequentially found inoperative cn August 14 and August 21, 1974.

Unit 2 reactor was in the early phases of the startup test program and has reached full operating temperature and pressure, but has nct been operating above approximately 6-percent thermal power.

On August lb,1974, uith the reactor in a shutdour conditicn at appror,imately 1CO psic, FC71-52 failed to open. On Aut;ust 21, 1974, with the reactor still in the shutdown conditicn, but at atmospheric pressure, a seccnd valve, FCV l-27, failed to open when manually actuated. These valves are the outboard containment isolaticn valves in steamlines "D" and "B," respectively. All other main steam isolatien valves have been tested and appear to be fully operacional.

The reactor will remain in a cold shutdcun condition until investigatien and corrective acticn is conplete.

We have had no previcus failures of this nature with these valves.

Very truly ycurs, 4m W O* o

- N o. TENHESSEE VALLEY AUTHCRITY 0* o ,

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to 04 Enclosure om CC(Enclosure):

@@m Fr. Norman C. Fcceley, Director Region Il Regulatory Operat1ons Offica, USAEL, fg,, 'j_

230 Feachtry Stnet, M. . Suite 818 Atlanta, Gecrgia 30303 COPY SENT REGION' u ' j