A finding of very low safety significance and associated non-citied violation of
10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was self-revealed for the licensees failure to meet the requirements of
MA-AA-716-012, Post Maintenance Testing, which states, in part that post maintenance testing ensures that a component is able to perform its intended function and that the original deficiency is corrected. Specifically, licensee procedure QCEMS 0210-01 failed to include quantitative and qualitative acceptance criteria for determining that the Unit 1 250 VDC Battery Charger could perform its intended function. This issue was placed into the licensees
CAP as
IR 1631541. Immediate corrective actions included replacing the float
potentiometer in the battery charger circuitry, replacing a thyristor in the voltage regulation circuitry, and correcting a loose solder connection identified in the battery charger circuitry. Planned corrective actions include revising procedure QCEMS 0210-01 to include acceptance criteria that ensure the battery chargers can satisfactorily perform their intended function. The finding was determined to be more than minor because the finding was associated with the
Mitigating Systems Cornerstone attribute of equipment performance and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. The inspectors determined the finding could be evaluated using the
SDP in accordance with
IMC 0609,
Significance Determination Process, Appendix A, The
Significance Determination Process (
SDP) for Findings At-Power. The inspectors answered, No, to all of the Exhibit 2,
Mitigating Systems Screening Questions, in Section A and determined the finding was of very low safety significance. This finding had a cross-cutting aspect of design margins in the area of Human Performance because the licensee did not operate and maintain the battery charger within design margins. Specifically, the licensees post maintenance testing acceptance criteria did not give them enough margin to prevent the battery from becoming inoperable (H.6).
