Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Nuclear safety in the U.S. is governed by federal regulations and continues to be studied by the Nuclear Regulatory Commission (NRC). The safety of nuclear plants and materials controlled by the U.S. government for research and weapons production, as well those powering naval vessels, is not governed by the NRC. Licensees (organizations applying for construction licenses or operating licenses for nuclear facilities) are required to show before the license is issued that they meet the requirements of the regulations.