Overall Instrumentation and Control Systems - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 278

Table 1. I&C systems that were modernized for approval of power unit life extension

Name of System Designation Designer

Neutron flux monitoring system NFMS “Impuls” (Ukraine)

Emergency and preventive reactor protection system E&PRPS “Radiy” (Ukraine)

Reactor power control, unloading, limitation and accelerated
preventive protection system

RPw CUL & APPS “Radiy” (Ukraine)

Rod group and individual control system RG&ICS “Impuls” (Ukraine), “Radiy” (Ukraine)

Engineering safety features actuation system ESFAS “Radiy” (Ukraine), Impuls (Ukraine)

Steam generator level and feedwater control system - Westinghouse Energy Europe

Unit computer information system CIS “Impuls” (Ukraine), “Westron” (Ukraine)

In-core reactor monitoring system IRMS KhIKA (Ukraine), “SNIIP-Atom” (Russia)

Reactor island normal operation systems - “Radiy” (Ukraine), “Impuls” (Ukraine)

Turbine island normal operation systems - “Radiy” (Ukraine), “Impuls” (Ukraine)

Refueling machine control system RMCS EVIG (Hungary), DIACONT (Russia)

Radiation safety monitoring system RSMS “Westron” (Ukraine)

Review of Instrumentation and Control
Systems Mission took place at the “Radiy”
Corporation site for review of FPGA tech-
nology in December 2010.
• The diversity requirement was not imple-
mented in Ukrainian NPP before 2000.
Ukrainian regulation, issued in 2000,
included this requirement for reactor
protection systems as necessary and for
other systems of safety class 2 (the high-
est) as recommended. It would be noted
that the diversity requirement caused many
contradictions and discussions between
the developers of regulations and opera-
tors and designers. After discussions, this
requirement was included in regulations
as obligatory only for protection systems.
After a ive-year period, specialists began
to perceive these requirements as a usual
task. The diversity principle has been now
incorporated in all reactor protection sys-
tems (designer - “Radiy” Corporation).
• Ukrainian companies have elaborated new,
their own equipment families (platforms).
• Ukrainian designers have the possibil-
ity to use the hardware components from

any foreign country. This was impossible
before in the USSR, when designers of
NPP I&C systems had to use only USSR
components.
• An important step was wide use of iber
optic communication lines instead of wire
lines.

A set of Ukrainian regulations (NP, 2000; NP,
2003; GND, 2000) were developed to support
I&C modernization. These regulations were har-
monized as much as possible with requirements
of international safety standards and guidelines
published before the preparation of these docu-
ments. It should be noted that the main principles
of IAEA, 2002 were taken in the account in the
Ukrainian regulations before the official issue of
this document.
All safety important I&C systems designed and
produced by Ukrainian companies were brought
into compliance with Ukrainian regulations.
The main results of modernizations are the
following (Yastrebenetsky, 2004):

• Increase of equipment dependability, avail-

ability and reliability;