The Nuclear Regulatory Commission has divided the US territory into four regions:


These four regions oversee the operation of 104 power-producing reactors, and 36 non-power-producing reactors. This oversight is done on several levels, for example:

• Each power-producing reactor site has Resident Inspectors, who monitor day to day operations
• Numerous special inspection teams, with many different specialties, routinely conduct inspections at each site
• Whistleblower reports are investigated by the Office of Enforcement, specifically the Allegations branch