05000282/FIN-2013004-03
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Finding | |
|---|---|
| Title | Failure to Properly Assess D6 EDG Operability |
| Description | An inspector-identified finding of very low safety significance (Green) and an NCV of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures or Drawings, was identified on August 15, 2013, due to the licensees failure to follow Procedure FP-OP-OL-01, Operability/Functionality Determination. Specifically, the licensee failed to evaluate the ability of the D6 emergency diesel generator (EDG) to perform its specified safety function over the expected voltage range of 3740-4580 volts after identifying that the radiator fan motor overload relays were improperly sized. Corrective actions for this issue included removing the D6 EDG from service to replace the relays and sharing the lessons learned from the failure to follow procedures with engineering personnel. The inspectors determined that this issue was more than minor because it was associated with the design control and equipment performance attributes of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). The inspectors determined that this issue was of very low safety significance because each question provided in IMC 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, was answered no. This issue was cross cutting in the Human Performance, Decision Making area because the licensee failed to use conservative assumptions regarding EDG operating voltage when making decisions regarding the D6 EDGs ability to perform its specified safety function with inadequately sized radiator fan motor thermal overload relays (H.1(b)). |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2013004 Section 1R15 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | K Riemer D Szwarc B Palagi M Phalen R Baker K Stoedter M Speck K Barclay P Laflamme E Sanchez-Santiago J Beavers M Ziolkowski T Daun |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Prairie Island - IR 05000282/2013004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2013Q3
Self-Identified List (Prairie Island)
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