"This Supplemental Directive establishes the requirements, processes, and procedures for conducting biennial reviews under the National Nuclear Security Administration (NNSA) Chief of Defense Nuclear Safety (CDNS). The CDNS is responsible for maintaining operational awareness of nuclear safety performance of NNSA Site Offices and contractors on behalf of the Central Technical Authority and Administrator. One of the means by which CDNS maintains this awareness is through biennial and other types of reviews. The reviews provide credible, objective, value-added information to NNSA line managers on the status of Program and Site Office nuclear safety oversight and implementation of nuclear safety requirements, and serve to facilitate continuous improvement in: the implementation and maintenance of nuclear safety requirements of the Nuclear Safety Rule, 10 CFR Part 830; the implementation and institutionalization of Integrated Safety Management Systems (ISMSs) that affect the implementation and maintenance of nuclear safety requirements; and the implementation of the requirements for the Federal oversight responsibilities and processes contained in DOE O 226.1A for the protection of workers, the public, and the environment. CDNS convenes teams of evaluators who perform these reviews, which are an integral part of Headquarters support of facility and program line management."
Manual NA-1 SD 226.1-1
National Nuclear Security Administration: http://nnsa.energy.gov/