Environmental Engineering Reference
In-Depth Information
Control Functions
command) with the nominal speed simul-
taneously all CR of one group selected by
the operator with the help of switcher on
remote control and monitoring panel in
MCR or moving of the groups one by one
in the design order;
• In case of absence of commands from ad-
jacent I&C systems or from the operating
personnel: Retaining of all CR in the end
or any intermediate positions (including
cases of power interruption during the time
set by the design);
• By emergency reactor protection (ERP)
command, received from any of two SHC
E&PRP sets: Disconnecting of power sup-
ply of all control rod drives, which cause
CR drop under their own weight into low-
ermost position (on lower hard supports),
(then - drop of CR into the core);
• By accelerated preventive reactor protec-
tion (RAPP) command, received from
SHC RPwCUL&APP: Disconnecting of
power supply of CR driving mechanisms
of one (previously selected) group, which
causes drop of all CR of the group into the
core;
• During preventive reactor protection
(PRP1) command action, received from
any of two SHC E&PRP sets, or reac-
tor power unloading (RPwU) command,
received from SHC RPwCUL&APP:
Forming and sending control signals to
control rod CR drives, which provide low-
ering of CR groups with the nominal speed
in the design order starting from the last
removed group;
• During action of preventative preventive
reactor protection (PRP2) command, re-
ceived from any of two SHC E&PRP sys-
tem sets: Forbidding of all commands per-
forming, which initiate CR lift;
•
By the operator's initiative (by B↑ or D↓
command from the group control key on
remote control and monitoring panel in
MCR): Forming and sending control sig-
nals to control rod CR drives, which pro-
vide lift or lowering with the nominal
speed simultaneously of all CR of one
group selected by the operator with the
help of switcher on the same remote con-
trol panel, or moving groups one by one in
the design order;
•
By the operator's command B↑ or D↓ from
the control key on the remote control in
MCR: Forming and sending control signals
to control rod CR drives, which provide lift
or lowering with the nominal speed simul-
taneously of all CR of the ifth group;
•
By the operator's initiative (by the com-
mand B↑ or D↓ from individual control
key on the control and monitoring panel
in MCR): Forming and sending to control
rod CR drives of the control signals, which
provide lift or lowering simultaneously
with the nominal speed of any CR or sev-
eral CR (up to six) selected by the operator
with the help of buttons embedded in the
core map on the same control panel;
•
By the operator's command from the key
on control and monitoring panel in MCR:
Forming and sending control signals to
control rod CR drives, which provide suc-
cessive lift (by groups in order of priority)
of the CR, which upon performance start or
after drop by ERP or RAPP command are
on lower hard support, and their stop at the
•
By the commands of automatic regula-
tion received from SHC RPwCUL&APP:
Forming and sending to control rod CR
drives of control signals, which provide
lift (by B↑ command) or lowering (by D↓
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