A Penetration is a way through in a barrier. The barrier may be the reactor vessel, Primary Containment, or a fire barrier. Penetrations serve a variety of purposes like fluids or electrical cables. Penetrations are controlled in order to maintain the intent of the barrier. For example, penetration lets fluids pass through the barrier while maintaining a pressure boundary.
Penetrations have their own identification number and tracking techniques.
See Property:Penetration
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