Abstract
The analysis of new regulation and standard on nuclear and radiation safety of instrumentation and control (I&C) systems important to safety of nuclear power plants (NPP) is fulfilled and the peculiarities of the requirements to accuracy of such systems are defined. The definition of requirements to establishment and assurance of accuracy characteristics of measuring channels, alarm channels and control channels of I&C system important to NPP safety is considered. The confirmation of requirements to accuracy characteristics (metrological certification and calibration) are analyzed. The peculiarities of requirements to accuracy of the above mentioned channels taking into consideration their redundancy and methods of exclusion of unreliable data of the redundant measuring channels are considered.
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