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Extra info for Instrumentation and Ctl Systems Important to Safety in Nuclear Powerplants (IAEA NS-G-1.3)
Spurious actuation should be considered as a mode of failure when applying the concept. At no time is more than one failure assumed to occur. 17. To interpret the single failure criterion as defined in the Requirements for Design, the criterion shall be applied to each safety group incorporated in the plant design. ‘Safety group’ is defined as that assembly of equipment (frequently referred to as a ‘train’) which performs all actions required after a PIE in order that the limits specified in the design basis for that event are not exceeded (Ref.
93. g. where a channel has been removed from service for testing and yet must be properly restored to service for safety), the test method should ensure that both objectives are satisfactorily achieved. For example, when a sensor has been removed from service for a periodic test, visual cross-checking with the redundant sensors (or other equivalent means) should be used to verify its subsequent restoration to service. g. instrument root valve position, maintenance bypasses) should be verified to ensure their return to the original operating state.
Reliability is an important attribute of systems important to safety. The Requirements for Design require that all structures, systems and components that are items important to safety be designed such that their quality and reliability are commensurate with their classification. In particular, reliable I&C systems important to safety are necessary to prevent undue challenges to the integrity of physical barriers and to ensure the reliability of engineered protective systems. For the protection system, Ref.
Instrumentation and Ctl Systems Important to Safety in Nuclear Powerplants (IAEA NS-G-1.3)