12.72. Should there be a complete loss of both off-site and on-site power, all pumps would gradually coast to a stop and the result would be a loss- of-flow accident. However, within 30 s or so, emergency power should be available from the diesel generators to operate essential pumps. In the meantime, the reactor would have been tripped upon receipt of the loss — of-flow signal, and steam would be automatically dumped from the turbine. Since some onsite power would continue to be produced during the dump­ing process, the circulation pumps would normally be left connected to the main generator busbar for about 30 s. The circulation during coastdown together with some natural circulation of the coolant would normally be

sufficient to prevent the critical heat flux condition being attained following reactor trip.