General Provisions - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 23

• Constructional aggregation on several as-
sembly levels (module units, assembles
of modules, devices, software-hardware
complexes).
• Standardization of input / output signals,
communication interfaces and protocols
between aggregate modules.
• Consistency of requirements to items by
resistance to external factors typical for in-
dustrial operation conditions.
• Software, standard-methodological provi-
sion, information provisions, service and
instrumentation tools.
• Development of concepts of design of
object- and problem oriented assembles
of modules, devices, software-hardware
complexes.

• Signal generation (transform input signals
into digital form, process data and gener-
ate output signals according to speciied
algorithms).
• Cross output (generate and output com-
mands by results of logical processing of
signals, obtained from three signal genera-
tion cabinet according to logical condition
“two-out-of-three”).
• Remote control (actuators control by com-
mands of automatic regulators, technologi-
cal protection and interlocking, obtained
from signal generation or cross output
cabinets and by commands of operating
personnel).
• Alarm (commands, which control process
signaling board in the main- and emergen-
cy control rooms).

At present, during design and packaging of
I&C systems at Ukrainian NPPs several equip-
ment families are used.
RADIY PLATFORM (Bachmatch, 2008) -
equipment family of Research and Production
Corporation Radiy. Its main peculiarities are: use
of Field Programmable Gate Arrays (FPGA) in
function blocks of lower level to perform main
functions; use of programmable electronic de-
vices built-in in the same blocks for independent
performance of auxiliary functions (control, di-
agnostics, etc.); primary use of fiber-optic lines
for data exchange between component parts of
SHC; use of industrial servers, panel computers,
uninterruptable power supply for exchange of
message, archiving, display, recording, database
maintenance, etc. in workstations,
RADIY PLATFORM has two-level structure.
Lower level is formed by typical cabinets:

• Position monitoring (determine control

rod positions and output proper signals to
remote control cabinets and indication ele-
ments, located in the main and emergency
control rooms).

• Power supply (provide primary power sup-

ply to software-hardware complexes and
force power supply by alternating and di-
rect current for control rod drives; termi-
nate force power supply by command of
reactor protection or accelerated preven-
tive protection, obtained from cross output
cabinet).

Cabinets include modular units to input stan-
dardized analog signals, signals of thermoelectric
transmitters and digital signals, of generation con-
trol commands, diagnostics, alarm, optical com-
munication and transmission of optical signals,
selection of interlocking, actuators control, etc.
Upper level of RADIY PLATFORM is formed
by workstations, which:

• Normalizing (obtain and normalize dis-
crete signals, continuous standard DC sig-
nals and signals of thermoelectric convert-
ers, and also provide galvanic separation of
chains and power supply for sensors).

• Receive technological information and di-

agnostic messages from cabinets of lower
level.