05000482/FIN-2013002-01
From kanterella
Revision as of 00:19, 22 February 2018 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Finding | |
|---|---|
| Title | Failure to Initiate a Condition Report and Determine Extent of Condition for Emergency Diesel Generator Head Stud Failure |
| Description | The inspectors identified a NCV of 10 CFR 50 Appendix B, Criterion XVI, Corrective Actions. The licensee did not initiate a CR for a hardware failure of an emergency diesel generator structural component identified in October 2006. On October 15, 2006, while performing planned maintenance on the emergency diesel generator B, a broken cylinder head stud was discovered while disassembling the number four cylinder. None of the other seven studs on that cylinder showed any visible damage, so maintenance and engineering personnel assumed a surface nick was the cause of the failure and simply replaced the bolt under Work Order WO 06-288926-000. No CR was written so there was no formal cause evaluation, no hardware failure analysis to specify the mode of degradation, or any consideration of extent of condition for potential common cause failures. On January 7, 2013, a broken cylinder head stud was found during maintenance on emergency diesel generator B. An independent laboratory determined that the stud had failed due to high cycle fatigue. Subsequent analysis of the stud that failed in 2006 confirmed the same failure cause. This issue was entered into the CAP as CR 65912. Failure to identify, determine the cause and take actions to prevent recurrence for a broken emergency diesel generator cylinder head stud, a significant condition adverse to quality, is a performance deficiency. The performance deficiency is more than minor and therefore a finding because, if left uncorrected, would have the potential to lead to a more significant safety concern because the failure to determine the cause, evaluate the extent of condition, and take action to preclude repetition was later confirmed to have left an additional degraded or failed studs undetected for over six years. The inspectors screened the finding using Inspection Manual Chapter 0609, Appendix A, Significance Determination Process for Findings at Power, Exhibit 2, Mitigating Systems Screening Questions, Section A. The finding screened as Green because it was a design or qualification issue where affected system, structures, or components maintain their operability or functionality. No cross-cutting aspect was assigned associated with the 2006 events because the primary causes of this finding were not indicative of current licensee performance |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2013002 Section 4OA3 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Peabody D You J Laughlin L Carson M Bloodgood M Williams N Greene N O'Keefe R Kopriva T Hartman |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| INPO aspect | |
| ' | |
Finding - Wolf Creek - IR 05000482/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Wolf Creek) @ 2013Q1
Self-Identified List (Wolf Creek)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||