Technology and Operation - Kernkraftwerk Gösgen

Coolant treatment systems
The volume control system links the highpressure
reactor coolant system to the lowpressure
auxiliary and secondary systems.
The reactor coolant system is filled and
drained by means of the volume control system.
The volume control system offsets the
temperature-related volume fluctuations in
the reactor coolant which occur during reactor
start-up and shutdown and with reactor
load changes. It also supplies sealant water
to the high-pressure shaft seals on the reactor
coolant pumps.
Some 30 tons of coolant per hour are taken
out of the reactor’s primary circuit for purification.
To keep the level of radioactive sub-
Chemical and volume control and waste processing systems
Seal water
supply system
Volume control
system
Auxiliary and secondary systems
Demineralised water
Chemicals
stances in the reactor coolant system as low
as possible, corrosion and fission products
are removed. Coolant purification is performed
by mixed bed filters filled with two different
ion exchange resins. After purification,
the coolant can be degassed. Coolant degassing
constitutes an additional purification
step.
In the coolant storage system the coolant is
separated by evaporator systems into boric
acid and demineralised water (fully desalinated
and degassed water). Boric acid and
demineralised water are used for controlling
reactivity.
All the chemical substances needed to treat
the coolant are prepared in the chemical control
and feed system. This same system is
Fuel pool
purification system
Coolant
purification system
Coolant
degassing system
Coolant
storage system
Boric acid and demineralised
water control system
Chemical
control system
Reactor building drains
Water from laundry and showers
Gaseous waste
processing system
Coolant
treatment system
Liquid waste processing
system
Concentrate
processing system
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Drum store
Vent stack
River