Performance of C-E system 80 reactor coolant pump with loss of component cooling water

The effects of the loss of auxiliary cooling water systems to the reactor coolant pump -- motor assembly are examined. The design details of the hardware involved and its performance during such simulated events are described along with appropriate calculations and past operating experience. The results support the following conclusions: (1) The reactor coolant pump-motor assembly can remain operational for a period of at least 45 minutes from the time of the loss of component cooling water. Operation without component cooling water for this time interval does not increase the possibility of shaft seizure or adversely affect coastdown. (2) The postulated loss of the redundant seal cooling systems (component cooling water system and seal injection system), while requiring continued operation of the reactor coolant pumps, is not a credible event. (U.S.)