Qualification of Safety System Testing Periodicity with Increasing Fuel Campaign Time at Nuclear Power Facilities

V. I. Skalozubov, Yu. S. Katsarskyi, Ye. O. Mazur,
V. Yu. Kochnieva, D. O. Klymchuk

Interagency Center for Fundamental Scientific Research in Energy and Ecology Sector, 1, Shevchenko Ave, Odesa, 65044

DOI: doi.org/10.31717/2311-8253.25.2.2

Abstract

Based on the analysis of the results of the probabilistic  safety analysis of nuclear power facilities with VVER, the need to develop alternative methods for qualifying safety system testing periodicity in modes of increasing the time of nuclear reactor fuel campaigns has been recognized. An alternative risk-informed method for qualifying the periodicity of tests of active and passive safety systems in modes of increasing the time of fuel campaigns has been developed. The qualification criterion of the developed method is the probability of failure of accident control systems for three groups of initial accident events: reactor circuit leakage to the containment of the nuclear power facility, inter-circuit leaks in the steam generator, and initial events with a leak proof reactor circuit. The qualification conditions of the developed method are ensuring the design reliability indicator of accident control systems in modes of increasing the time of fuel campaigns. Based on the developed qualification method, the following has been recognized: it is necessary to modernize the periodicity of scheduled tests of active safety systems at reactor power; lack of grounds for the need to qualify the periodicity of scheduled tests of passive safety systems in modes of increasing the time of fuel campaigns.

Keywords: qualification, safety system, nuclear power facility

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