Purpose/Industry Need: The proposed revision to the NUC-001 standard will clarify that subrequirement R9.3.5 requires the Nuclear Plant Generator Operator and the applicable Transmission Entity to have an Agreement with a provision to consider a nuclear plant's coping time (the period of time a nuclear plant can function without an AC power source) required by Nuclear Plant Licensing Requirements during the restoration of Off-site Power following a loss of all Off-site and On-site AC Power Sources.