ML20085H024

AO BFAO-50-260/7414W:on 740920,drywell Equipment Primary Containment Isolation Valve FCV 77-15B Failed.Caused by Sticking solenoid-operated Valve.Valve Changed Out & Cycled Several Times.Foreign Matter Found in Armature Housing

ML20085H024
Person / Time
Site:	Browns Ferry
Issue date:	09/30/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085H029	List: ML20085H024 ML20085H031
References
NUDOCS 8308300104
Download: ML20085H024 (2)

Text

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TENNESSEE CHATTANOOGA, VALLCL_,) TENNESSEEAUTHOF! iTTY !~~Wl *\'77p" ; '

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' September 30, 1974  : SE"dEEEEE

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Acting Director of Licensing

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I Office of Reg'.11ation

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.. Washington, DC 20545

Dear Mr. Case:

TETHESSEE VI.LLEY AUTHORITI - BROWS FERRY HUCLit.R PINIT UNIT 2 -

, DOCKET NO. 50-260 - FACILITY OPERATING LICENSE DPR /J3HORMAL OCCURRE:CEREPORTBFAO-50-260/7414U The enclosed report is to provide details concerning failure of the drywell equiprent drain primary contain:nent inolation valve FCV 77-15B

. cnd is submitted in accordance with I.ppendix A to Regulatory Guide 1.16,

! Revision 1, October 1973. This evcnt occurred on Browns Ferry I!uelear

, Plant unit 2 on September 20, 1974.

Very truly yours,

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TEHKESSEE VALLEY AUTHORITY

/// 0' gry ,,p i fa, E. F. Thomas l fy Director of Fouer Production I-Enclosure.

CC (Enclosure):

Mr. Norman C. Moseley, Director l Region II Regulatory Operations Office, USAEC 230 Peachtree Street,liW., Suite 818

• Atlanta, Georgia 30303 l

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• ABITORMAL OCCURREHCE ICPORT Report Ho.: DF/.0-50-260/7414W Report Date: September 30, 1974 Occurrence Date: September 20, 1974 Fe.cility: Browns Ferry Huelcar Plant unit 2 Tdentification of Occurrence Failure of the drywell equipment drain primary containment isolation valve FCV 77-15B.

Conditions Prior to Occurrence The reactor was at approximately 2-percent power.

Descrintion of Occurrence While attempting to close the dryvell equipment drain sump pump primary containment -

isolation valves from the control room, FCV 77-15B failed to close.

Desirnation of Aprarent Cause of Occurrence The solenoid-operated valve, FSV 77-15B, suppling air to the air-operated valve, FCV 77-153, was sticking.

Analysis of Occurrence At the time of failure of FCV 77-153,' the other valve, FCV 77-15A, closed. This satisfied technical specification requirements calling for at least one of the. .

vtaves to be in the code corresponding to the isolated condition when there is an inoperable isolation valve in that line. This failure caused no damage to~ J any systems, components, or structures. There were no adverse effects on the health or safety of the public as a result of this failure.

Corrective Action The solenoid valve was changed out. The valve was then cycled several times, y operating satisfactorily each tine. The solenoid.ves disassembled to determine.

the cause of sticking. Particles of foreign material vere found in the armature housing probably causing the armature to stick. j .i Failure Data .,) .

The colenoid valve is manufactured by Versa Products Company with the following nameplate:

1 Valve, _ solenoid product No. USG-3521, suffix detail U-14-15-21-31.

A previous failure of this type of solenoid valve on unit 1 was reported in BFAO-7351W.

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