Modeling of emergency diesel generators in an 800 megawatt nuclear power plant

Computer models have been developed of emergency diesel generators and their associated emergency core cooling system induction motors during sequencing and results compared with field tests. Models required to perform studies of emergency diesel generators in a nuclear plant are presented. Field measurements indicating different response of two seemingly identical generator excitation systems are discussed. Results of 480 volt ac contactor dropout testing are provided for determining voltage limits in the 480 volt system during motor starting transients.