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 376

PRINCIPLES OF SAFETY
ASSESSMENT OF THE
MODERNIZED NPP I&C
SYSTEMS IN UKRAINE

• Licensing: Authorization for performing

activities connected with use of NPP and
sources of ionizing radiation;

• Inspection: Execution of inspection for

compliance with the requirements and
conditions of provided permissions by or-
ganizations and enterprises using NPP and
sources of ionizing radiation.

According to Law of Ukraine “On Nuclear Energy
Use and Radiation Safety” (Law of Ukraine, 1995)
during development and implementation (modifi-
cation) of NPP safety important I&C systems at all
LC stages the assessment of their safety, performed
by expert authorities during State expert review
of NRS in the framework of scientific technical
support of the regulatory authority is mandatory.
Thus, all documents substantiating safety of
the NPP I&C systems undergo expert review of
State expert review of NRS. In case of a positive
result of expert review of documentation, issued at
a specific life cycle stage, the regulatory authority
gives a permit to proceed to the next stage of the
project for development and implementation of
I&C systems at NPP.
NPP nuclear and radiation safety is a feature
of not exceeding determined limits of radiation
effect on personnel, population and environment
under normal NPP operation, failures of normal
operation and design basis accidents and also of
restricting radiation effects under beyond design
basis accidents. NPP I&C safety is understood as
a part of NRS, which relates to jointly operating
I&C systems and technological equipment of NPP
power units and depends on proper operation of
the I&C systems.
Safety regulation of nuclear energy use is
performed by specially established regulatory
authority and is one of the fundamental principles
of safety management, which purpose is safety
assurance for people, natural environment, NPP
and sources of ionizing radiation. State regulation
of safety of nuclear energy use includes:

The regulatory authority acts independently
from designers, constructors, operators to such
an extent that is required for safety assurance was
the only task of personnel of this authority. For
efficient performance of its functions, the regula-
tory authority possess all required legal powers,
has a full access to NPP and to proper information
which is held by operator.
Let us consider in detail a function of the regu-
latory authority such as licensing (authorization).
According to Law of Ukraine “On Authorizing
Activity in Nuclear Energy Use” (Law of Ukraine,
2000), authorization activity is a component of
nuclear safety regulation. It provides:

• Licensing of activity of operator at sepa-
rate stages of NPP life cycle;
• Granting of individual permissions on ex-
ecution of certain types of work or opera-
tions at stages of commissioning, operation
and decommissioning;

• Licensing of activity connected with direct

personnel control of NPP reactor unit;

• Certiication of sources of ionizing ra-

diation and elements, safety important for
NPP.

The purpose of authorization-based activity
is the following:

• Provision of use of NPP only with ap-

proved level of safety according to national
requirements;

• Standardization: Determination of na-

tional regulatory criteria and requirements,
deining conditions of use of NPP and
sources of ionizing radiation,

• Provision of activities in the ield of nuclear

energy use only by those physical and legal