Field Programmable Gate Array Technology for NPP I&Cs - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 139

Figure 9. Generic architecture of RCS configuration in 1oo2 voting logic version for PWR Unit

◦ System size scalability accommodat-
ing needs for increased number of in-
puts and outputs.
◦ Simple and controlled ways of code
modiication of protection, interlock-
ing and control algorithms.
◦ Adaptability of interfacing capabili-
ties for communication and integra-
tion with other control, monitoring
and regulating systems.

Eighteen ESFASs are in operation now at
Rovno NPP, South-Ukrainian NPP, and Kozloduy
NPP (Bulgaria).
Nuclear Island and Conventional (Turbine)
Island Systems: Nuclear Island and Conventional
(Turbine) Island Systems (see Figure 11) have the
following main functions:

• Conditioning and initiation of protection,

interlocks and alarm commands.

• Conditioning and initiation of automatic

regulation commands when process values
deviate from setpoints.

The ESFAS can be supplied in single-, two-,
three-, or four-channel installations. The ESFAS
conforms to safety class 2, can be designed and
built in accordance with applicable national stan-
dards in the EU countries and the USA.

• Initiation of remote control commands

based on operators' instructions.

• Indicate current states, positions and oper-

ating modes of actuators in control rooms.