Diversity and Multi-Version Systems - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 218

module redundant subsystems; It should be noted
that this list is not concluded because of an uni-
versality of Radiy Platform. PRC Radiy has the
ability to build different digital I&C systems for
reactors of any type. The example of two-channel
RTS is shown at Figure 35.
Both channels implemented on Radiy Platform.
Reactor Power Control and Limitation System;
Engineering Safety Features Actuation System
(ESFAS); Control Rods Actuation System; Au-
tomatic Regulation, Monitoring, Control, and
Protection System for Research Reactors; these
I&Cs were developed as one-version systems
consisting of triple module redundant subsystems.
The first commissioning of the RADIY plat-
form was done in 2003 for Ukrainian NPP unit
Zaporozhe-1. In seven years since that time, more
than 80 applications of RPC Radiy systems have
been installed in 17 nuclear power units in Ukraine
and Bulgaria. These systems are commissioned in
pressurized water reactor (PWR) plants known as
“WWER” reactors developed by the former Soviet
Union. WWER reactors are used in Armenia, Bul-
garia, China, Czech Republic, Finland, Hungary,
India, Iran, Russia, Slovakia, and Ukraine.

The largest project implemented by RPC Radiy
is the modernization of six ESFASs for Bulgarian
NPP Kozloduy (three ESFASs for Kozloduy-Unit
5 and three ESFASs for Kozloduy-Unit 6).

RADIY RTS DIVERSITY
ASSESSMENT

Radiy RTS Diversity Assessment
Based on General Approach

RADIY Platform can be used for building whole
multi-channel systems as well as for building
one (primary or diverse) channel of I&C System.
For cases using the platform in several channels
of a system, diverse solutions should be used
and appropriate diversity assessment have to be
performed.
The following example shows the results of
assessment for two variants of RTS. Both systems
are two-channel and have diverse channels with
primary channel based on Altera FPGA. The first
variant diverse channel is based on Actel FPGA
(see Table 9). The second variant uses FPGA
produced by Xilinx in the diverse channel (see

Figure 35. Radiy platform based Reactor Trip System with primary and diverse channels