A self-revealing
NCV of very low safety significance of
10 CFR 50 Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified because Entergy personnel used instructions that were not appropriate to the circumstances, resulting in an inadvertent trip of the A
emergency diesel generator (
EDG) fuel rack. Entergy\\\'s corrective actions included promptly restoring the A
EDG to an
operable state, removing the qualifications for the auxiliary operator and field support supervisor involved in the event, and initiating
CR-VTY-2011-05483. The inspectors determined that the inadvertent trip of the A
EDG fuel rack by Entergy personnel was a performance deficiency that was reasonably within Entergy\\\'s ability to foresee and prevent. This finding is more than minor because it is associated with the Human Performance attribute of the
Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability of systems that respond to
initiating events to prevent undesirable consequences (i.e. core damage). Specifically, the inadvertent trip of the A
EDG fuel rack resulted in the unplanned unavailability of the A
EDG for approximately two minutes. The inspectors determined the significance of the finding using
IMC 0609.04, Phase 1 - Initial Screening and Characterization of Findings. The finding was determined to be of very low safety significance (Green) because it did not represent a loss of system safety function, a loss of safety function of a single train for greater than its technical specification allowed outage time, and did not screen as potentially risk significant due to external
initiating events. The inspectors determined that this finding had a crosscutting aspect in the Human Performance cross-cutting area, Work Practices component, because Entergy did not ensure supervisory oversight of work activity such that nuclear safety was supported
