General Provisions - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 22

one and monitors current database, which allows
bumpless switching to duplicating controller,
when the main fails. For connecting controllers to
network of FDDI, special-purpose network adapt-
ers are used. Input-output modules of analog and
discrete signals have built-in microcomputers and
can be duplicated or reserved on logic condition
“two-out-of-three.” During the use of fiber-optic
communication lines, it is possible to move input-
output modules on 2 km from a controller. Instead
of any input-output modules, single-loop regula-
tory module, communication module, rotation
velocity detector, controller valve positioner can
be connected to a controller.
Upper level is formed by workstations,
implemented on the basis of personnel computer
with a processor Pentium IV or Sun Blade 150,
operation system Windows NT or Sun Solaris
(correspondingly), random-access memory, disc
storage, special operator's keyboard. In work
stations interfaces for direct connection to FDDI
network are provided.
Engineering workstation performs configura-
tion and software maintenance functions, stores
system programs and source codes of application
programs. Workstation of archiving and recording
is implemented on platform Ultra Sparc Station
under operation system UNIX. It stores data about
measured values, events, operator's actions, etc.
In the whole world hundreds of information and
control systems, based on platform OVATION, are
developed and implemented in power engineer-
ing and other branches. In Ukraine OVATION
is used in safety parameters display systems at
Zaporozhe NPP.
As far as equipment families OVATION are
not certified for use in safety systems, Emerson
Process Management implements such systems on
AC 160 platform (earlier Westinghouse Electric
Company used platform Eagle for safety system).
In particular, on the basis of AC 160 reactor pro-
tection system in Ringhals NPP unit 2 (Sweden)
and safety systems in Ulchin NPP units 5 and 6
(South Korea) were implemented.

TELEPERM XP and TELEPERM XS - equip-
ment families, developed by Siemens Power
Corporation as a technical base for central part
of information and control systems, including
systems important to safety. Platform TELEPERM
XP is oriented at application in normal operation
systems, TELEPERM XS - in NPP safety systems.
Among other foreign platforms Common
Qualified Platform (Common-Q), developed by
ABB Nuclear Automation (Westinghouse Electric
Company uses modified version of this platform -
Westinghouse Advant), and Tricon programmable
logic controller system (Tricon PLC) of Triconex
Corporation are also should be mentioned.
In Ukraine during assembling of new software-
hardware complexes to be supplied on NPP,
platforms of foreign companies are nearly not
used currently.
First Ukrainian equipment families were
developed more than 30 years ago. In 1983, at
International exhibition “Automation-83,” placed
in Moscow, an aggregate complex of technical
means (platform) MikroDAT, widely used in
various industry branches and in nonindustrial
field (Didenko & Rozen, 1985), was presented.
Typical characteristics of this platform, further
developed in modern Equipment family, should
be mentioned:

• Implementation of concept of distributed
control, based on use of large integrated
circuits, microprocessors.
• Optimization of nomenclature of aggregate
modules (functionally complete, structur-
ally standalone items with uniied external
communications).

• Standardization of the main and joint size

of aggregate modules and switching ele-
ments for external connections.

• Speciic assembly items for placing, me-

chanical protection, electric integration
and connection of aggregate modules to
external chains.