International Standard Bases and Safety Classification

2014 ◽  
pp. 31-60
Author(s):  
Michael A. Yastrebenetsky ◽  
Grygoriy Gromov
Keyword(s):  
International Atomic Energy Agency ◽  
Atomic Energy ◽  
International Electrotechnical Commission ◽  
Energy Agency ◽  
International Standard ◽  
Standard Bases ◽  
Technical Requirements ◽  
General Safety

The main standard bases for NPP 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 the bases are considered. Classifications of I&C systems and their components are given on the basis of their safety impact. According to the IAEA classification, all systems are divided into safety important and non-safety important. 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. All functions are divided into categories A, B, C.

International Standard Bases

2020 ◽  
pp. 27-55
Author(s):  
Serhii Trubchaninov
Keyword(s):  
International Atomic Energy Agency ◽  
Atomic Energy ◽  
International Electrotechnical Commission ◽  
Energy Agency ◽  
International Standard ◽  
Standard Bases ◽  
Technical Requirements ◽  
And Control ◽  
General Safety

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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