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Among the thousands of structures, systems, and components (SSC) that comprise a nuclear power plant, the component class relied upon most for protection, control, monitoring, and supervision is instrumentation and control (I&C) components and systems. A typical unit has approximately 10,000 sensors and detectors and 3,000 miles of instrumentation cables. In total, the mass of I&C components averages approximately one thousand tons. Next to buildings and structures, I&C represents the heaviest and most extensive infrastructure in any plant.
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