"The American Concrete Institute ""Code Requirements for Nuclear Safety Related Concrete Structures (ACI 349-01)@"" referred to as ""the Code@"" provides minimum requirements for reinforced concrete design or construction in applications where protection against potential radioactive releases is a concern. The scope of the Code has historically addressed new construction; however@ this scope has recently been extended to providing recommendations for the analysis@ design@ construction@ testing@ and evaluation of new and existing concrete nuclear structures. While the requirements of this Code pertain primarily to new concrete structures@ corresponding recommendations for the evaluation of existing concrete nuclear structures are provided in ACI 349.3R-96.1.3 The Owner is to identify nuclear safety related structures and establish which of them are covered by ""Code for Concrete Reactor Vessels and Containments (ACI 359)"" and its latest revisions in lieu of this Code. Some special structures involve unique problems that are not covered by the Code. While the requirements of this Code pertain primarily to new concrete structures@ corresponding recommendations for the evaluation of existing concrete nuclear structures have been developed by the committee separately (ACI 349.3R-96). The Code is applicable to radioactive waste repository structures; however@ considerations of thermal loads@ load combinations@ and long-term durability should be considered."