The following violation of very low safety significance (Green) was identified by Exelon and is a violation of NRC requirements which meets the criteria of the NRC Enforcement Policy for being dispositioned as a non- cited violation (NC V). Ginna TS Table 3.3.1- 1 requires the function of under frequency Bus 11A and 11B be tested to be greater than or equal to 57.5 hertz in accordance with surveillance requirement 3.3.1.10.
Surveillance requirement 3.3.1.10 requires this testing to be completed in accordance with the
Surveillance Frequency Control Program. The
Surveillance Frequency Control Program requires the function of under frequency Bus 11A and 11B be tested every 24 months. Contrary to the above, on February 6, 2017, Ginna engineering personnel determined that the Bus 11A under frequency function had not been tested within the interval specified frequency ; the function had last been tested on May 1, 2014 . Upon identification, Exelon conducted a risk evaluation and completed the surveillance requirement at the next available opportunity i n accordance with
surveillance requirement 3.0.3 for a
missed surveillance. Exelon entered this issue into the
CAP as
AR 03970849 and completed the testing on March 11, 2017. Additional evaluation was required to demonstrate operability since the acceptance criteria of greater than or equal to 57.5 Hz was not met. The inspectors determined the finding was of very low safety significance (Green) in accordance with
IMC 0609, Appendix A, The
SDP for Findings at Power, Exhibit 1,
Initiating Events Screening Questions, issued June 19, 2012, because the
transient initiator did not cause a
reactor trip and the loss of mitigating equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition.
