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The practice of using physical systems and administrative systems in a structure of mutual reenforcement to avoid exposure of the public, the workforce, and the environment to nuclear radiation and to radioactive materials.

An approach to facility safety that builds in layers of defense against hazards so that no one layer by itself, no matter how good, is completely relied upon. To compensate for potential human and mechanical failures, defense in depth is based on several layers of protection with successive barriers to prevent the hazard from becoming actualized. This approach includes protection of the barriers and further measures to protect the public, workers, and the environment from harm in case these barriers are not fully effective.

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  • Environment
  • Safety
  • Security

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