ML20151Y180
| ML20151Y180 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/18/1977 |
| From: | Constable G, Sniezek J, Whitt K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-130, NUDOCS 9809180141 | |
| Download: ML20151Y180 (1) | |
Text
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PRELIMINARY NOTIFICATION July 18, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance.
The information presented is as initially received without verification or evaluation
_and is basically all that is known by IE staff on this date.
FACILITY _:
Tennessee Valley Authority Browns Ferry Unit No. 3 Athens, Alabama
$UBJECT:
_ EXCESSIVE TEMPERATURE IN OFFGAS CHARC0AL FILTER During operation at 600 mwe on July 17, 1977, an apparent ignition took place at 4:00 p.m. in the offgas system's "B" charcoal filter, as evidenced by high temperature (greater than 700 degrees F recombiner operation was erratic prior to the occurrence.). The hydrogen The filters were bypassed by isolating them from the offgas system at S:00 p.m. and a nitroger, purge was' initiated on all charcoal filters.
Unit operation con-tinues with the filters bypassed.
Subsequent analysis of samples of the stack effluent indicated I-131 concentration of 8.63 E-12 uci/cc (0.08% of technical specification limit) and I-133 concentration of 1.05 E-11 uci/cc (0.15% of T.S. limit)..
Additional sampling is in progress.
m.
m Temperatures in the "B" filter have stabilized at about 1000 degrees F based on copper constantan thermocouple readings.
Licensee is removing a wall to perform a visual inspection of the filter unit to aid in determining cause of the event.
The licensee has informed the State of Alabama and plans to make a press release.
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Region II received notification of this event at 5:15 a.m. on July 18, 1977. Region II inspectors are enroute to the Browns Ferry site.
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Contact:
KWhitt, IE x27451 GLConstable, IE x27451 JHSniezek, IE 27451 p
Distribution: Transmitted H St / 2. 7 ;
g Commissioner Kennedy C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Gilinsky S. J. Chi 1F, SECY H.H.Whiteside,SCtd H. R. Myers, HCEE s
Transmitted:
MNBB_/ j P Bldg l l 3 L-55 Bldg ll3 c/
L. V. Gossick, ED0 E. G. Case, NRR C. V. Smith, NMSS S. H. Hanauer, ED0 J. A. Harris, PA W. G. Mcdonald, MIPC Luge (MAIL)
E. Volgenau, IE R. G. Ryan, OSP T. J. McTiernan, OIA Region @ Q3_(o
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H. K. Shapar, ELD 1 7,, c 1 1 PRELIMIN4RYNOTIFICATION 9809180141 770718 PDR I&E PNO-77-130 PDR