what is class 1 2 3 components classification in ASME Section III Division I subsection NF?
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Classification of Class-1,2,3 components of ASME Section III Division I sub-section NF is made based on the following criteria.
Class 1 Components/ Supports:
The supports whose failure can cause catastrophic failure/damage to the nuclear reactor core, primary coolant pressure boundary and steam generator that releases radioactivity.
Examples: Support for nuclear reactor vessels, support for primary coolant piping, and support for steam generators.
Class 2 Components/ Supports:
The supports whose failure can result in severe damage to the nuclear reactor coolant system and other safety-related systems but without immediate catastrophic consequences.
Examples: Supports for secondary coolant piping, supports for control rod drive mechanism, and supports for auxiliary equipment related to the reactor coolant system.
Class 3 Components/ Supports:
The supports whose failure does not affect the plant’s or the public’s safety.
Examples: Supports for non-safety-related piping and supports for non-nuclear components.