In Nuclear Power Plants
Emergency power systems, called there Emergency Diesel Generators (EDGs), are a required feature in nuclear power plants. They are typically installed in sets of three. The EDG installation is designed to the same safety-grade requirements as the other safety systems in the plant. The next (upcoming) generation of nuclear power plants includes some designs with multiple independent banks of EDGs (as in the ABWRs ).
Read more about this topic: Emergency Power System
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