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DOE-HDBK-1116-98
...operation and also the potential
OR CORE SPRAY AUTOMATIC
BLOWDOWN PERMISSIVE,"" REACTOR
personnel hazards associated with
WATER LEVEL LOW-AUTOMATIC
fighting fires in electrical cabling with
BLOWDOWN," and "CORE COOLING
water.
SYSTEM/DIESEL INITIATE."
Effects on Plant Operation
The control room operators observed that
normal conditions of reactor water level,
The first indication of the fire's effect on
reactor steam pressure, and drywell
Unit 1 operation came 20 minutes after
atmosphere pressure existed, so they
the fire started with the almost
were confused by the alarms. Over the
simultaneous annunciation of several
next 8 minutes, several events occurred,
alarms: "RESIDUAL HEAT REMOVAL
including the....
...After inserting the resilient
...instructed to recheck all penetrations
polyurethane foam into the leak, the
in their assigned areas.
inspector placed the candle about
1 inch from the foam to check the
Fire in the Cable Spreading Room
success of the repaired seal. The
airflow through the leak pulled the
Cable penetrations had been sealed
candle flame into the resilient
after initial installation but additional
polyurethane foam, which sizzled and
cables were often added. To make an
began to burn. The inspector and the
opening for additional cables, holes
electrician attempted unsuccessfully to
were punched through the wall...
put out the fire by breaking up....
...not already affected. Although the sug-
...instrumentation was lost. Unit 2
gestion to use water was made repeatedly
reactor was placed in shutdown cooling
by the local community fire chief, plant
about 11 hours after the fire started.
personnel were concerned about the ef-
fects of grounds and shorts on plant
Lessons Learned
operation and potential personnel hazards.
The inability to put out the fire was
Community fire fighting personnel did not
caused, in part, by the large air flow
arrive at the scene until approximately
through the penetration that prevented
45 minutes after they were called. Part of
the carbon dioxide and dry chemicals
the delay was the need to....
from smothering the fire.
Compounding this were the fire...
12


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