A self-revealing finding was identified for the licensees failure to follow the requirements of the station modification program manual
EDM 601 during implementation of a high pressure turbine replacement modification revision. This resulted in Anticipated
Transient Without
Scram Mitigation System Actuation Circuitry (
AMSAC) calibration procedures not being revised with the proper setpoints. The performance deficiency (
PD) was more than minor because it affected the Design Control attribute of the
Initiating Events Cornerstone and adversely affected the cornerstone objective in that
AMSAC actuated causing a
turbine trip. The finding was determined to have very low safety significance because it did not contribute to both the likelihood of a
reactor trip and the likelihood that mitigation equipment or functions would not be available. The cause of this finding was related to the cross-cutting aspect of the need for work groups to maintain appropriate interfaces and communicate, coordinate with each other during important work activities as described in the Work Control component of the Human Performance cross-cutting area because necessary revisions to the
AMSAC input device calibration procedures were not adequately communicated.
