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The US Nuclear Regulatory Commission (NRC) introduces the term functionally unavailable for an item that is capable of operation, but where the function normally provided by the item is unavailable due to lack of proper input, lack of support function from a source outside the component (i.e. motive power, actuation signal), maintenance, testing, the improper interference of a person, and so on.

The NRC‐term is seen to cover failures/faults of several of the categories above, most notably input/output and control failures.