ML20085H024
| 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: |
| References | |
| NUDOCS 8308300104 | |
| Download: ML20085H024 (2) | |
Text
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TENNESSEE VALLCL_,) AUTHOF! TTY !~~Wl *\\'77p" ;
CHATTANOOGA, TENNESSEE i
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' September 30, 1974 SE"dEEEEE r.
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Mr. Edson G. Case Acting Director of Licensing
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U.S. Atomic Energy Conniccion 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 fa, E. F. Thomas i
l fy Director of Fouer Production I-Enclosure.
CC (Enclosure):
l Mr. Norman C. Moseley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street,liW., Suite 818 l
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i 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
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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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