Abstract
Risk-informed approaches (RIA) analysis in relation to nuclear power industry has been presented. Limitations of safety’s probabilistic analysis (SPA) as a main tool for RIA have been demonstrated. In particular, such SPA problems as statistics uncertainty related to equipment reliability and a problem of accidents modelling uncertainty using thermal-hydraulic codes have been analyzed. Recommendations for accounting of these uncertainties have been given. Ways of RIA further development and results of their application for substantiation and implementation of measures to improve the safety and operation efficiency of nuclear power plants have been presented. Results of the RIA application for such measures as equipment change-over to on-condition maintenance, reduction of amount of testing related to hermetic shell, measurement system accuracy evaluation, some systems’ modernisation feasibility study have been illustrated.
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