Komarov Y. Method of Scheduled Tests and Switches Periodicity Optimization of Normal Operation Safety-Related Systems of NPP with VVER-1000

The object of research is planning of operation and control process for nuclear powerplants support safety-related systems. The purpose of a thesis is creation of a scheduled tests and switches periodicity optimization technique of normal operation safety-related systems (SRS NO) of NPP with VVER-1000. The probabilistic methods of systems reliability simulation are used: a regeneration method of repair modeling, Markov-process for the description of random transitions between possible condition, Boolean methods for the description of a system structure. The optimization parameter is a system reliability indicator, parameter which one is varied - periodicity of scheduled tests or switches of system components. The estimation of optimum performances is executed by the numerical methods that based on a covers method. The scientific novelty is the develop universal complex of reliability models, which one as against known models more correctly take into account of SRS NO equipment operation for intervalsbetween points of scheduled tests /switches; analytical solutions for pointwise availability of SRS NO elements are obtained that basis on an above-stated models and seven reasonable representative charts of operation. The practical value of the obtained outcomes consists in the technique, as a fundamentals of a standard branch technique and in mining the guidelines on change of scheduled tests and switches periodicity for Zaporozhye NPP SRS NO. Investigation results are mean for nuclear-power branch.