Environmental Engineering Reference
In-Depth Information
CR movement lower performance range
value (in lower limit switch position).
In case of simultaneous entry of commands
from group control key and fifth group control key
at the SHC RG&IC-R input, only group control
command is performed.
Distribution of CR by groups, sequence of
groups movement and priorities of control func-
tions performing in case of simultaneous perform-
ing of several functions at the SHC RG&IC-R input
are defined by rod group and individual control
algorithms, which are set in the reactor design.
SHC RG&IC-R realizes priorities of control func-
tions performance used at the Ukrainian power
units with WWER-1000 reactors:
Information Functions
• Displaying: coordinates of CR selected by
the operator for individual control; number
of group selected for manual group con-
trol; number of main (work) group and CR
auxiliary group while their moving in the
design order;
• Indication of movement direction (lift or
lowering) of the moving CR or CR group;
• Monitoring of all CR position within the
operating cycle stroke range (between LLS
and ULS) and identiication of two end and
ten intermediate position of each CR;
• Monitoring and displaying of the precise
(with 1% discretion) vertical position: se-
lected by the operator CR or selected CR
group; main (work) CR group while mov-
ing in the design order; each CR group
(intermediate position); all CR in one (any
one selected by the operator) group;
• Monitoring of vertical mismatch of all CR
in each group and sending of alarm mes-
sage led by sound signal in cases when po-
sition of, at least, one CR deviates for more
than ± 40 mm of the middle position of the
group, which this CR to constituent;
• Detection of fall of, at least, one (any) CR
into the core and sending of the signal,
which initiates forming of PRP2 command,
to the irst and second SHC E&PRP sets;
Emergency Reactor Protection: In re-
lation to the other functions: when ERP
commands is received, it is performed im-
mediately, after that performance of other
control functions is suspended and can be
renewed only after ERP command cancel-
lation at the SHC RG&IC-R input;
Accelerated Preventive Protection: In re-
lation to the other control functions except
emergency reactor protection: when RAPP
command is received, it is performed im-
mediately, after that reactor power unload-
ing (RPwU) command must be performed;
Preventive Reactor Protection PRP1: In
relation to the other control functions ex-
cept ERP and RAPP: during PRP1 com-
mand performance of B↑ and D↓ automatic
regulation and manual control commands
is blocked (RPwU command performs the
same actions as PRP1);
Preventive Reactor Protection PRP2:
In relation to any actions, which prescrip-
tive upward movement of any groups or
separate CR: during PRP2 command per-
formance of B↑ automatic regulation and
manual control commands is blocked;
Downward Movement of Any Groups or
Separate CR: In relation to any actions,
which prescriptive their upward movement.
Forming and sending to the in-core reactor
monitoring system (IRMS) of data on the
precise vertical positions of all CR;
Forming and sending to power unit com-
puter information system of messages with
data on: group control commands, initiated
by the operator and / or received from the
adjacent systems; coordinates of control
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