Environmental Engineering Reference
In-Depth Information
set of required sensors, independent from sensors
of other channels. The central part of each chan-
nel - signal forming (SF) device - implemented
in a separate cabinet, in which two plug-in card
cage (crates) with mounted in them in-coming
modules (cards) are placed, is provided. One of
crates performs functions of automatic power
control, another one controls unloading, power
limitation and initiates accelerated preventive
protection of the reactor. Each cabinet supplied
by built-in panel computers for set-points input
and adjustments.
The following is common for three SF devices
(channels):
nals CHECKING of proper system deacti-
vation (shown in Figure 7).
• Discrete signals, deining a selected opera-
tion mode (automatic and remote) and con-
trol mode from an alarm and control board,
placed in MCR.
Discrete output signals RPwC, generated in
case of a regulated parameter deviation (rela-
tive power or pressure in main steam collector)
from the specified value, initiate actions of the
actuation system RG&ICS that minimizes this
deviation due to lifting or dropping of a working
(regulating) group of control rods into the reactor
core. In TCS from cross cabinet signals, defining
selected control mode RPwC are transmitted.
Similar information of each channel and output
regulation commands, actions caused by them,
prohibition of decrease and (or) increase of power,
state (operability) of each channel are initiated on
the indication and control board. General signals
of operability failure and / or deactivation of any
of channel control board switching in MCR.
Crate performing functions of power unloading
and limitation (PUL) and accelerated preventive
protection (APP) receives:
• Cross output cabinet (not shown in Figure
8).
• Workstation (WS) of data archiving and
display, and laser printer.
• Visual alarms for the relection of the SHC
state and indicating the cause that initiated
unloading of reactor power.
• Keys for the task of the control (regulation)
modes, initiation of commands for unload-
ing and accelerated preventive protection
and conirmation of messages by MRC
personnel.
• Automated work places of technologist
and operator (not shown in Figure 7 and 8).
• Analog signals from sensors and normal-
izing transducers of coolant temperature,
pressure, power frequency and power of
main circulation pumps.
• Discrete signals from sensors of turbogen-
erator state (disconnection, setting of stop
valves, generator unloading).
• Analog signals, representing relative neu-
tron power value and discrete signals Рw
≥ 25% and Рw ≥ 75% from 1 NFMS and
2 NFMS.
• Discrete signals CHECKING of deactiva-
tion of 1 E&PRPS (2 E&PRPS).
Crate performing the reactor automatic power
regulation function receives:
• Analog signals from pressure sensors
above the core and main steam collector.
• Analog signals from 1 NFMS and 2
NFMS, representing a value of relative
neutron power Рw, and discrete signals
Рw ≥ 25%, Рw ≥ 75%, Рw ≥ «Pw», Рw ≥
ULAR “Рw.”
•
Commands PRP1 (regulation prohibition),
PRP2 (power increase prohibition) from 1
E&PRPS and 2 E&PRPS, and discrete sig-
•
Commands from keys “PUL” and “APP,”
placed in MCR.
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