Environmental Engineering Reference
In-Depth Information
Figure 4. Implementation of emergency and accelerated preventive reactor protection commands
Each signal forming cabinet has base and re-
serve protection signals forming channels. Their
outputs are connected by separate wires to the
base and reserve blocks of each power control
channel in all power control cabinets. Actuation
of power control channel (forming and delivery
of control signal, which activate power off of
appropriate CR drive) take place, if on input of
basic block this channel logical element “≥2”
commands from ERP or RAPP activate simulta-
neously from two or all three channel forming
safety signals. If basic block is in down state,
which is detected by diagnostic means, power
control channel activation realizes by reserve
block of this channel with the same conditions.
Forming and displaying of data on CR position
is shown in Figure 5.
Digital messages from CR position cabinet are
sent via fiber-optical communication lines, which
form the main and redundant control buses, to
channels of output signals forming on the first,
second and third signal forming cabinet. Each
channel transmits the received digital messages
via fiber-optical communication lines to the same
channels in two other signal forming cabinet,
receives from them similar messages and compares
them with data received via main and redundant
control buses. In case of data mismatching output
signal forming channel corrects unreliable input
information forming error signal. In case of re-
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