Technology and Operation - Kernkraftwerk Gösgen

Steam and
power conversion system
Low-pressure turbines and generator.
The conventional steam and power conversion
system does not differ essentially from
that of a fossil thermal power plant. It essentially
comprises the turbine, generator, condenser,
condensate and feedwater pumps,
preheaters and the feedwater storage tank,
all of which are located in the turbine building.
The function of the steam and power conversion
system is to use the energy released
by the live steam coming from the steam
generators to drive the turbine and the generator
coupled to it. After the steam has
passed through the low-pressure turbines, it
is condensed in the condenser.
The condensate is preheated in several
stages and fed back into the steam generators
by the feedwater pumps, via the feedwater
storage tank. As in all other thermal
power plants, demineralised water is used in
the water/steam circuit and this is prepared
in an on-site facility.
Live steam system
From the three steam generators in the reactor
building, the live steam travels at 280°C
and a pressure of some 62 bar through three
separate pipelines to the live-steam valve station,
which houses the spatially separate
safety valves, blow-off valves and isolating
valves. The three live-steam pipes enter the
turbine building via a pipe route, where the total
live-steam flow is subdivided into four
lines.
The steam is then conveyed into the doubleflow
high-pressure section of the turbine system
via four quick-acting stop valves and control
valves that are arranged in series. If
necessary, the quick-acting stop valves can interrupt
the steam supply to the turbine as a
protective measure.
As the steam leaves the high-pressure turbine,
it is still at a pressure of 11 bar with a
moisture content of some 13 % and a temperature
of 187°C. To prevent the low-pressure
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