A Green self revealing finding was identified for the failure to properly provide oversight over supplemental (vendor) personnel during the replacement of the Unit 2 turbine and
exciter rotors during the spring of 2010 in accordance with Dominion procedure
MA-AA-1001, Supplemental Personnel, Revision 9. The failure to properly provide oversight over supplemental (vendor) personnel in accordance with Dominion procedure
MA-AA-1001, Supplemental Personnel, section 3.8.1, during the spring 2010 replacement of the Unit 2 turbine and
exciter rotors was a performance deficiency. The performance deficiency was more than minor because it adversely affected the
Initiating Events cornerstone objective of reliability because the failure to properly conduct procedure
MA-AA-1001 directly resulted in the upset of plant stability by tripping the unit and the challenge of critical plant safety functions. Using
IMC 0609, Appendix A, The
Significance Determination Process for Findings at Power, issued June 19, 2012, the finding screens to green because although a
reactor trip occurred, the loss of mitigating equipment for transitioning the plant to a
safe shutdown condition did not occur. There is no cross cutting aspect for this finding because the initial cause of the finding occurred more than 3 years ago following turbine and
exciter rotor replacement.
