Environmental Engineering Reference
In-Depth Information
Table 2. Expert review of modernized I&C system during 1996-2012
Years
Number of modernized
I&C systems
Number of expert
reviews
Number of assessed documents,
substantiating safety
Number of assessed
regulatory requirements
1996-
2012
257
826
1112
41558
State expert review of NRS is performed at all
life cycle stages of the I&C systems. At the same
time checking of the I&C systems for compliance
with several tens of safety criteria, i.e. manda-
tory requirements of modern regulatory documents
is performed (during each expert review assess-
ment of compliance with 30-40 requirements of
guides, rules and standards of NRS is made).
During safety assessment of the NPP I&C
system experts have to deal with a large amount
of information that makes expert review a labor-
intensive process and increases probability of fault
occurrence. In particular, experts should:
◦ International safety standards and
guidelines;
◦ Intergovernmental and national stan-
dards, rules and guides in nuclear
power engineering;
◦ Regulatory documents of supplier
countries of equipment for NPPs of
Ukraine, deining regulatory require-
ments to expert review objects (I&C
systems and their components);
◦ Regulatory documents which are cur-
rently in force in Ukraine and contain
regulatory requirements on expert re-
view subjects (documents, substanti-
ating safety).
• Assess compliance of I&C system with
a large amount of requirements on safety
regulated in various regulatory documents;
• Perform analysis of submitted documents
for expert review, which substantiate safety
of the NPP I&C system;
• Assess diferent additional designers' and
NPP's documents, in which data about
modernization, reconstruction and imple-
mentation of new I&C system at NPP units
of Ukraine, is contained;
• Consider information about implemented
(modernized) I&C system (about its com-
position, structure, functions, experience
of approbation of similar systems etc);
• Analyze reports, expert conclusions and
analogous documents that contain results
of earlier performed safety assessments of
the I&C systems and their components;
• Choose rules and methods of safety assess-
ment regulated in regulatory documents
and applied procedures (algorithms, pro-
grams, calculation formulas etc.);
• Work with
•
Reference to native and foreign publica-
tions for additional information that can be
important for safety assessment of the NPP
I&C systems.
It is obvious that such an approach requires
information support of expert activities to decrease
efforts and increase expert work efficiency.
Knowledge base that will simplify searching
and selection of required for experts information
is suggested to be developed.
For knowledge base development the following
tasks should be solved:
• Development of general structure of the
knowledge base;
• Development of detail structure if all chap-
ters contained in the knowledge base;
regulatory
documents,
including:
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