Ventilation is necessary to prevent hazardous build-up of hydrogen gas.
EDGs are required to accommodate emergency loads after approximately 10 to 50 seconds following a power failure. EDGs supply power for an extended period. UPS only provides power for a short period, usually less than two hours. A work order is in place to reduce these loads. Except for informal hand calculations performed in 1978, loading calculations were not available for the EDG in Building 371.