The team concluded that for a period of seven hours and 14 minutes neither train of the
CCW system would have automatically started if called upon during a load shed event. For the A-Train, the 1C
CCW pump was
inoperable after a system operator manipulated the foot pedal on the breaker at 1700 on September 4, placing it in a trip free condition. It remained in this condition until the breaker was replaced and retested at 0014 on September 5. Concurrently, for the B-Train, the 1A
CCW pump, although running, would not have automatically restarted from a load shed. This was demonstrated by its failure to manually start from the control room on September 5. [Note, the 1B swing pump was tagged out during this entire period and unavailable.] However, the inspectors did determine that following an actual load shed event in which the 1A
CCW pump would have initially failed to start, control room operators would have manually recovered the B-Train of
CCW by attempting another start of the 1A
CCW pump. The licensee demonstrated that the 1A
CCW pump would have restarted on a second attempt. Additionally, operator actions to manually start the 1A
CCW pump that failed to start automatically were consistent with licensed operator continuing training and procedure requirements for Emergency Operating Procedures implementation. A detailed time line of the significant events described above is provided in Attachment 1. This item is left unresolved pending evaluation of the operational effects of the
CCW system being unable to automatically actuate. It is identified as an Unresolved Item (
URI), and is tracked under
URI 05000348(364)/2007010-01, Unavailability of
CCW System to Automatically Actuate Due to Breaker Failures.
