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The inspectors identified a Green NCV of 1 … The inspectors identified a Green NCV of 10 Code of Federal Regulation (CFR) 50, Appendix B, Criterion XVI, Corrective Action , because Exelon personnel did not identify and correct a condition adverse to quality associated with emergency diesel generator (EDG) D24 lubricating oil pipe fitting supports. This resulted in EDG D24 being in a degraded condition from November 2012 until the condition was corrected in May 2013. Exelon personnel entered this issue into the corrective action program (CAP) as issue reports (IRs) 1507365, 1509125, 1511869, 1512745, 1526780, and 1528088. The failure of Exelon personnel to identify and correct the degraded instrument line pipe fitting support and insert on EDG D24s lubricating oil supply pressure sensing line following the failure of a pipe fitting on November 13, 2012 is a performance deficiency that was reasonably within Exelons ability to foresee and correct. The IR written to document the issue (IR 1439284) was inappropriately classified as not a critical component failure. This resulted in the issue receiving a lower level of investigation (work group evaluation versus an apparent cause or root cause evaluation). This NRC-identified finding was more than minor because it is associated with equipment performance and affected the Mitigating System cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating event to prevent undesirable consequences. The inspectors evaluated the finding using Appendix A, The Significance Determination Process (SDP) for Findings At-Power, to IMC 0609, Significance Determination Process. Exelon personnel conducted vibration testing which determined that the pipe fitting crack initiation and propagation occurred during engine slow start speed acceleration. This was based vibration data which showed two vibration peaks at speeds during the acceleration. Also, the crack did not propagate during normal speed operation based on the fact that the leak size did not increase during monthly testing on April 27, 2013. The inspectors determined this finding did not represent an actual loss of function of a single train for greater than it Technical Specification Allowed Outage Time. Therefore, the inspectors determined the finding to be of very low safety significance.ing to be of very low safety significance.

Discovered date

23:59:59, 30 June 2013 +

Docket

05000352 + and 05000353 +

Event date

23:59:59, 30 June 2013 +

Finding integer

1 +

Finding type

Non-cited violation +

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Identified by

NRC identified +

Inspection Manual Chapter

NRC Inspection Manual 0609 +

Inspection procedure

IP 71111.15, Operability Determinations and Functionality Assessments +

Inspection report

IR 05000352/2013003 +

Inspector

Mel Gray +, R Nimitz +, J Hawkins +, O Masnyk Bailey +, J Tomlinson +, Juan Ayala +, Eugene Dipaolo +, Stephen Hammann + and Thomas Burns +

Issue report

AR 01439284 +

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00:48:38, 21 February 2018 +

Person