Organization and Information Support of Expert Reviews of I&C Systems Modernization at NPP of Ukraine - Nuclear Power Plant Instrumentation and Control Systems for Safety and Security - page 377

parties that can guarantee performance of
requirements of legislation, guides, rules
and standards of NRS.

In Ukraine state expert review of NRS is
performed by the State Scientific and Technical
Centre for Nuclear and Radiation Safety (SSTC
NRS) which is an organization of technical sup-
port of the regulatory authority.
Figure 1 shows a diagram of interaction
between different authorities during licensing
process (including state expert review of NRS).
State expert review of NRS during moderniza-
tion of the NPP I&C systems consists in assessment
of documentation, substantiating safety of NPP
I&C systems for compliance with NPP safety
principles and also to main requirements of NRS
assurance determined in legislative and regula-
tory documents currently in force.
In general case an expert review object can be
NPP in a whole or its different systems, including
components. In particular these objects are new/
modernized NPP I&C systems and their com-
ponents: software-hardware complexes (SHC);
hardware (HW); software (SW).
Expert review subject (reviewed documenta-
tion) can be design, engineering, technological,
software, organizational management and other
documents related to expert review object and

Main principle of authorization-based activity
in the field of nuclear energy use is a priority of
NRS assurance over other purposes.
Receiving a license by the applicant is the
basis to start activities, execution of work and
operations connected with certain life cycle stage
of NPP. The license determines conditions and
limits of such activity performance.
An integral part of licensing process is the as-
sessment in the framework of state expert review
of NRS.
In NP, 2005, a concept “state expert review
of nuclear and radiation safety” is defined as a
complex of organizational, scientific technical and
expert and analytical activities that is performed
by a special regulatory authority for independent
assessment of technical safety level in the field of
nuclear energy use, taking into account all factors
that lead to nuclear and radiation danger to hu-
man health and environment including physical
protection assurance.

Figure 1. Interaction between authorities during licensing process