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Peter
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Peter
Asked: April 2, 20242024-04-02T19:04:47+05:30 2024-04-02T19:04:47+05:30In: Seismic Analysis of Structures

What are Class 1,2,3 components in ASME Section III Division I sub-section NF?

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what is class 1 2 3 components classification in ASME Section III Division I subsection NF?

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    1. johncarter
      2024-04-02T19:06:43+05:30Added an answer on April 2, 2024 at 7:06 pm

      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.

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