Rod Group and Individual Control System - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 341

is not included to design order; for control
of one selected CR. Upwards movement
command (B↑) is sent in case of holding
of key in right position, downwards move-
ment command (D↓) - in left position.
After lowering key is set in intermediate
(ixed) position, with that the command is
cancelled;

lines, which connect monitoring and control panel
to each signal forming cabinet.
Embedded diagnostic equipment performs
continuous automatic monitoring of component
parts technical condition. Test results are dis-
played on embedded monitor and transferred to
workstation.
Indication devices on MCR and ECR displayed
the position of each CR in two limit positions and
ten intermediate sections of control rod working
stroke. One-digit indicators are placed in 10 as-
semblies each of them to one CR group; quantity
of indicators corresponds to CR quantity in the
respective group. Data on position of each CR
are sent in form of continuous unified direct cur-
rent signal (4-20 mА) via separate electrical line,
which connects indication device and the respec-
tive channel in CR position cabinet. Information
signal parameter (direct current) is transformed
into discrete signals code combination and dis-
played in form of digital symbol on indicator,
which to this CR.
Workstation, made on base of Hewlett-Packard
industrial computer components, performs:

• Button without locking for exit of the pre-

ventative protection mode, initiated in SHC
E&PRP by fall CR signal. Button lightning
turns on simultaneously with start of fall
CR signal sending and turns of after the
button is pushed;

• Switcher on 2 ixed positions for putting

SHC RG&IC-R from working mode to
automatic test mode (test scheduling and
procedure, which are supported in auto-
matic test mode, correspond to the speci-
ied above).

On monitoring and control panel the follow-
ing data are displayed: number and direction of
CR main (working) group movement (in case of
design order group movement the auxiliary group
number is shown); vertical position of working
group; coordinates of CR, selected for individual
control, its vertical position and movement direc-
tion. On built-in panel computer, embedded in
monitoring and control panel, this information is
represented in more details (in a digital form, in
form of histograms, mnemonic images, explaining
descriptions and notes). By operator's initiative
additional data can be displayed: vertical position
of all groups and all CR in any group; coordinates
of CR, which the middle group position is defined;
deviation of each CR position from the middle.
In case of deviation of, at least, one CR for more
than ± 40 mm of the middle group position alarm
message is sent.
B↑ and D↓ commands are sent to signal forming
cabinets via separate independent electrical lines.
Other information is sent and received in form of
digital messages via fiber-optical communication

• Receiving of fault signals and diagnostic

messages on SHC RG&IC-R component
parts technical condition, communication
lines, control keys, CR drives, sensors of
control rod positions;

• Continuous automatic monitoring of

own component parts technical condition
(self-diagnosis);

• Processing of received data and results of

self-diagnosis, archiving, displayed of cur-
rent and archived information on industrial
monitors; sending of diagnostic messages
to CIS and IRMS;

• Sound alarm in case of failure detection,

displayed of alarm messages on industrial
monitors; forming and sending of general-
ized signal about faults to CIS and IRMS
and to MCR.