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Snisar I.B.,State Scientific and Technical Center for Nuclear and Radiation Safety
Nuclear and Radiation Safety | Year: 2014

This paper analyzes a mathematical model of ionizing radiation fields generated near material surfaces by the sources distributed over them. It is shown that there is an objective limit of their spatial heterogeneity, and this limit does not depend on the distribution of sources on surfaces. Some possible applications of the obtained result in radiation protection and dosimetry have been identified.


Snisar I.,State Scientific and Technical Center for Nuclear and Radiation Safety
Nuclear and Radiation Safety | Year: 2015

The paper presents original procedures for zoning, survey optimization and verification of surface radiation fields dosimetry data. These procedures give an opportunity to find unambiguous solutions for the problems of zoning and survey routing of the above fields at any scope of input data, as well as an opportunity to verify field measurements data acquired at any measurement grid and using any methods.


Klevtsov A.,State Scientific and Technical Center for Nuclear and Radiation Safety
Nuclear and Radiation Safety | Year: 2013

The approaches and methods accepted in Ukraine for reliability assessment of NPP instrumentation and control systems are presented in the paper. The software for reliability calculation which was developed by SSTC NRS and results of its verification are described as well.


Chumak D.,State Scientific and Technical Center for Nuclear and Radiation Safety | Klevtsov O.,State Scientific and Technical Center for Nuclear and Radiation Safety
Nuclear and Radiation Safety | Year: 2015

Active introduction of information technology, computer instrumentation and control systems (I & C systems) in the nuclear field leads to a greater efficiency and management of technological processes at nuclear facilities. However, this trend brings a number of challenges related to cyber-attacks on the above elements, which violates computer security as well as nuclear safety and security of a nuclear facility. This paper considers regulatory support to computer security at the nuclear facilities in Ukraine. The issue of computer and information security considered in the context of physical protection, because it is an integral component. The paper focuses on the computer security of I & C systems important to nuclear safety. These systems are potentially vulnerable to cyber threats and, in case of cyber-attacks, the potential negative impact on the normal operational processes can lead to a breach of the nuclear facility security. While ensuring nuclear security of I & C systems, it interacts with nuclear safety, therefore, the paper considers an example of an integrated approach to the requirements of nuclear safety and security.


Dybach O.,State Scientific and Technical Center for Nuclear and Radiation Safety | Nosovsky A.,State Scientific and Technical Center for Nuclear and Radiation Safety
Nuclear and Radiation Safety | Year: 2015

The paper considers the general task on checking compliance of probabilistic safety indicators with regulatory criteria. It presents correlations to assess probable exceeding of safety criterion for different laws of distribution of the numerical results of the probabilistic safety analysis (PSA). The paper presents the scale for rationing probability of safety criteria exceeding.

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