Although the instructional developer should be concise, enough of a description is needed to
make the case meaningful. All aspects of the case related to the objective must be included.
In this example case study the specific points mentioned above are included in the following
supply and exhaust fans and will always
be toward the area of possible higher
radiation. The reactor building and
refueling floor is the area of lowest
This commercial nuclear power
pressure. The standby gas-treatment
plant is a three-unit boiling water reactor
system must exhaust air from the reactor
site. At the time of the event, Units 1
building to maintain a negative pressure.
and 2 were in operation at 100% power.
In order not to exceed the capacity of
Unit 3 was under construction.
this system, inleakage to the reactor
building must be kept at a minimum.
Activities Preceding the Fire
The refueling floor is common for
The plant is designed so the air
all three reactor units. To maintain the
movement from one plant area to another
is controlled by
...operation and also the potential
OR CORE SPRAY AUTOMATIC
personnel hazards associated with
B LO WD O WN
fighting fires in electrical cabling with
Effects on Plant Operation
The first indication of the fire's
The control room operators
effect on Unit 1 operation came
observed that normal conditions of
20 minutes after the fire started with
reactor water level, reactor steam pres-
the almost simultaneous annunciation
sure, and drywell atmosphere pressure
of several alarms:
existed, so they were confused by the
alarms. Over the next 8 minutes, several
events occured, including the....