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(from Wikipedia) The NRC’s mission is to regulate the nation’s civilian use of byproduct, source, and special nuclear materials to ensure adequate protection of public health and safety, to promote the common defense and security, and to protect the environment.
The NRC’s regulatory mission covers three main areas:

• Reactors – Commercial reactors for generating electric power
  and research and test reactors used for research, testing, and
  training

• Materials – Uses of nuclear materials in medical, industrial,
  and academic settings and facilities that produce nuclear fuel

• Waste – Transportation, storage, and disposal of nuclear
  materials and waste, and decommissioning of nuclear facilities
  from service

The NRC is headed by five Commissioners appointed by the President of the United States and confirmed by the United States Senate for five-year terms. One of them is designated by the President to be the Chairman and official spokesperson of the Commission. The current chairman is Gregory B. Jackzo. He was first sworn in as a Commissioner on Jan. 21, 2005, and his term runs through June 2013. He was designated Chairman of the U.S. Nuclear Regulatory Commission by President Barack Obama on May 13, 2009.