05000461/FIN-2014004-06
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Finding | |
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| Title | Modifications to Steam Dryer Tie Bars 28 and 30 Without a 10 CFR 50.59 Safety Evaluation |
| Description | The inspectors identified a Severity Level IV non-citied violation of 10 CFR 50.59(d)(1), Changes, Test, and Experiments, for the licensees failure to perform a written evaluation, which provided the bases for the determination that a change did no
require a license amendment. Specifically, the licensee made a change pursuant t 10 CFR 50.59(c) with the installation of 12 inch holes adjacent to welds attaching tie bar 28 and 30 to the steam dryer vane assembly and did not provide a basis for th determination that this change would not result in a more than a minimal increase in th likelihood of occurrence of a malfunction of an system structure or component important to safety. The licensee entered this finding into the CAP as IR 02223135 and identified a action to secure a detailed assessment of these degraded tie bar locations from the steam dryer vendor. The licensee also consulted with the steam dryer vendor and made a qualitative assessment that the additional unflawed and unaltered portion of the fillet welds present at the end of the tie bar 28 and 30 locations provided a reasonable basis t conclude that these tie bars would not fail and affect the operability of safety-relate components. The inspectors determined that the failure to provide a written evaluation, which provided the basis for the determination that a change did not require a license amendment, was a performance deficiency. Specifically, the licensee failed to provide a basis for not applying for a license amendment associated with increased likelihood of a SD failure that impacts safety-related equipment due to reduced structural support available at tie bars 28 and 30. The performance deficiency was determined to be more than minor in accordance with IMC 0612, "Power Reactor Inspection Reports," Appendix B, "Issue Screening," dated September 7, 2012, because it was associated with the Initiating Events cornerstone attribute of equipment performance and adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. In addition, the associated violation was determined to be more than minor because the inspectors could not reasonably determine if the changes to the SD at tie bars 28 and 30 would have required NRC prior approval. Per IMC 0609, Attachment 4, Initial Characterization of Findings, and Appendix A, The Significance Determination Process for Findings at Power, the finding was screened against the Initiating Events cornerstone and determined to be of very low safety significance (Green) because the finding did not cause a reactor trip and the loss of mitigating equipment relied upon to transition from the onset of the trip to a stable. The performance deficiency associated with this finding did not reflect current licensee performance; therefore, no cross cutting aspect was identified with this finding. In accordance with Section 6.1.d.2 of the NRC Enforcement Policy, this violation was categorized as Severity Level IV because the resulting changes were evaluated by the SDP as having very low safety significance. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2014004 Section 4OA2 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | TEV: Severity level IV |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | M Holmberg R Elliott R Ng S Bell S Mischke W Schaup C Lipa E Sanchez Santiago J Beavers |
| Violation of: | 10 CFR 50.59 |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2014004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2014Q3
Self-Identified List (Clinton)
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