Abstract
This chapter describes the Defense in Depth (DID) concept in nuclear safety. It provides multiple independent protections against the occurrence of accidents and their progression. The object of independent barriers in totality is only an objective. The definition of DID can be defined on a general defense principle. It can be implemented through design and operation provisions. The decision to create DID in the plants can be taken at the start of nuclear energy development. It also indicates a remarkable farsightedness. History has demonstrated that it has been the best defense against the uncertainties of the technology. The DID concept is based on four principal barriers against the external release of radioactive products. At the same time, it is also based on five defence levels for using the barriers in a unique way. The actual implementation of DID needs the support of some base requirements. These requirements descend from the technical principles of nuclear safety and can lead to the specific measures.
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