Two auxiliary 750-kw diesel generator sets are on standby to provide the
following: (1) Power to the main bus for operating those loads needed to
supply cooling for decay-heat removal after a scram or shutdown, (2)
emergency “take-home” power should the nuclear power plant become
inoperative, (3) power for reactor startup, and (4) spare generating
capacity for normal operation should a turbine generator become
inoperative.
In the event of a reactor “scram,” these generators will automatically
start and synchronize on the main bus bar to supply and distribute power
to the components used for reactor cooling.
A 300-kw emergency diesel generator is also available to supply power to
the 450-volt emergency switchboard. This source will operate in case
both the main turbine generators and auxiliary diesel generators do not.
Loads connected to the emergency switchboard include lighting, low speed
windings of the primary coolant pumps, and the emergency cooling system.
A battery protected source will also provide power to those loads that
require an especially dependable power source with no interruption due
to loss or switching of auxiliary power.