The basic concept, the origin and the progress of nuclear security are reviewed in this paper. The basic idea includes the nuclear security elements and the classification of measures. Then, the current states of the related regulations and technical work of International Atomic Energy Agency (IAEA), the United States and China in the nuclear security field are discussed. The requirements in the nuclear security equipment selection, the system design and the construction are analyzed. In the last part, the challenges in the nuclear security area, like the cyber security, the anti-drone defense and the underwater defense, are discussed, together with several suggestions about the future nuclear security technology R&D directions.

nuclear facility  /  nuclear material  /  nuclear security