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An emergency power system (EPS) for a nuclear power plant provides the plant with the necessary power in all relevant conditions within the design basis so that the plant can be maintained in a safe state after postulated initiating events, in particular during the loss of off-site (grid) power. This Safety Guide elaborates on the requirements for ensuring the reliability if EPSs as established in The Safety of Nuclear Power Plants: Design , which it supplements. It describes how the requirements should be met in the design of emergency power systems (EPSs) for nuclear power plants. |