A self-revealing, Green non-cited violation (
NCV) of
Technical Specification (TS) 6.8.1.b, Administrative Controls, was identified for
LGS failure to properly implement station procedure
MA-AA-716-100, Maintenance Alterations Process, during troubleshooting and calibration associated with the Unit 1 condensate filter (
CF) system. As a result, on September 9, 2014, one of two Instrument Maintenance (IM) technicians inadvertently mispositioned the air supply valve to the 1G
CF flow transmitter causing an unplanned plant
transient. The inspectors determined that the failure to properly implement station procedure
MA-AA-716-100, Maintenance Alterations Process, during troubleshooting of
CF system instrumentation, was a performance deficiency.
LGS promptly performed an investigation, verified the plant alignment and safely returned the Unit 1 reactor to 100 percent power.
LGS entered the issue into their corrective action program (
CAP) as
issue report (IR) 2116233
This self-revealing finding is more than minor because it affected the human performance attribute of the
Initiating Events Cornerstone and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions. This resulted in elevated
main steam line radiation levels which required operators to reduce reactor power in accordance with abnormal operating procedures. The inspectors evaluated the finding using inspection manual chapter (IMC) 0609, Appendix A, The
Significance Determination Process for Findings At-Power, to
IMC 0609,
Significance Determination Process. This finding was determined to be of very low safety significance (Green) because it was associated with a
transient initiator, but didnt cause a
reactor trip and the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The finding has a cross-cutting aspect in the area of Human Performance, because
LGS maintenance management did not ensure supervisory and management oversight of work activities [H.2].
