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What is Safety Classification

Chapter 2
Cyber Security and Safety of Nuclear Power Plant Instrumentation and Control Systems
Differentiation of systems or their components into classes, depending on their impact on NPP safety.
Published in Chapter:
International Standard Bases
Serhii Trubchaninov (State Scientific and Technical Center for Nuclear and Radiation Safety, Ukraine)
Copyright: © 2020 |Pages: 29
DOI: 10.4018/978-1-7998-3277-5.ch002
Abstract
The main standard bases for NPP instrumentation and control (I&C) systems are documents of the International Atomic Energy Agency (IAEA) and International Electrotechnical Commission (IEC). Standards are interconnected through the following: IAEA develops general safety principles for NPP I&C systems, and IEC develops technical requirements that use and specify safety principles. Structures of both bases are considered. IAEA and IEC safety classification principles are described. Classifications of I&C systems and their components are given on the basis of their safety impact. According to IEC, functions to be performed by I&C systems shall be assigned to categories according to their importance to safety. The importance to safety of a function shall be identified by means of the consequences in the event of its failure, when it is required to be performed, and by the consequences in the event of a spurious actuation.
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