The licensee identified a finding of very low safety significance (Green) and associated
NCV of
10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings. This regulation requires in part that activities affecting quality be prescribed by procedures of a type appropriate to the circumstances and be accomplished in accordance with these procedures. Contrary to the above, the licensee identified during the performance of operator rounds on May 11, 2012, that a
scaffolding modification interfered with the operation of the
EDG G-01 ventilation gravity
louvers contrary to the requirements of procedure MI 32.9,
Scaffolding Program. The cause of the issue was determined to be the result of the related procedure not requiring an operations department review of modifications made to
scaffolding after initial installation. The licensee entered this into the
CAP as
AR01795985 and
AR01766629 and implemented corrective actions to remove the interference and modify the inadequate procedure. The performance deficiency was determined to be more than minor because it was associated with the
Mitigating Systems Cornerstone attribute of equipment performance and adversely affected the associated cornerstone objective to ensure the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. Specifically, the erected
scaffolding impacted the
EDG G-01 ventilation gravity
louvers operation impacting the
EDGs operability. The inspectors evaluated the issue using
IMC 0609,
Significance Determination Process, Attachment 0609.04, Initial Characterization of Findings, Tables 2 and 3, dated June 19, 2012, and
IMC 0609, Appendix A, Exhibit 2, for the Mitigating System Cornerstone and answered No to the mitigating
SSCs and functionality questions; therefore, the issue screened as very low safety significance (Green).
