The inspectors reviewed selected applicable plant records, correction action documents and approved procedures while evaluating the performance of operations personnel in response to non-routine evolutions. The inspectors assessed personnel performance to determine what occurred and how the operators responded, and to determine if plant personnels response was in accordance with plant procedures and training. The following non-routine evolution was reviewed: During the conduct of surveillance testing of the E-3
EDG on March 15, 2007, a licensed operator missed the performance of a required step in a supporting system operating procedure. The omission of the procedure step placed the E-3
EDG in the isochronous mode while synchronized with offsite power through a 4 kilovolt (kV) vital bus. This condition resulted in unexpectedly loading the E-3
EDG beyond its 30-minute load rating. The
ST and supporting procedures directed the synchronization of the E-3
EDG to a selected
4 kV bus to pick up the bus loads. The procedure subsequently directed opening the offsite power feeder breaker to the
4 kV vital bus (the missed step) before placing the
EDG in the isochronous mode.
PBAPS placed this issue in the
CAP by initiating IR 604364. Prompt corrective actions included the selected implementation of additional peer checking of procedure performance place-keeping. The E-3
EDG was inspected for potential damage and tested before being returned to an
operable condition in accordance with TS on March 17, 2007. The causal evaluation of this event was ongoing at the end of the inspection period. At the close of this inspection period, the inspectors were reviewing the event and awaiting the results of the causal evaluation to understand the potential performance deficiencies. This issue is unresolved pending review of
PBAPSs causal evaluation and corrective actions by the inspectors to characterize the issue.
URI 05000277/2007002-05, Missed Procedure Step Resulted in Unplanned Overloading of the E-3
EDG.
