05000254/FIN-2011004-03
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Finding | |
|---|---|
| Title | Non-Safety Related Main Steam Modification Failure |
| Description | NRC inspectors identified a finding of very low safety significance when analysis performed for installation of a small bore instrument sensing line modification for Unit 1 main turbine thermal performance testing did not include all applicable stresses as required by the USA Standards B31.1.0-1967 Code. On June 13, 2011, that line failed, resulting in an emergency downpower and reactor scram. The issue was incorporated into the corrective action program (CAP) as IR 1227884. Immediate corrective actions removed the leaking sensing lines on Unit 1 and permanently plugged the pipe penetrations. The performance deficiency was more than minor because it affected the Initiating Events Cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during power operations as described in IMC 0612, Appendix B. The key attribute impacted was design control for plant modifications. The inspectors performed a SDP phase 1 screening for the finding using IMC 0609, Table 4a, and answered all of the questions No. Therefore, the finding screened as very low safety significance, or Green. Inspectors determined that a significant contributor to this finding was the failure of the individual and supervisor performing the acceptance review of the contractor generated modification to engage the appropriate engineering expertise to evaluate the adequacy of the modification design before the modification was implemented. As a result, inspectors identified this issue as cross-cutting in the area of Human Performance - Work Practices in that the licensee did not ensure supervisory and management oversight of work activities, including contractors, such that nuclear safety was supported |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2011004 Section 1R18 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | M Munir A Dahbur M Mitchell M Phalen M Ring J Mcghee B Cushman R Edwards C Mathews L Rodriguez |
| CCA | H.2, Field Presence |
| INPO aspect | LA.2 |
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Finding - Quad Cities - IR 05000254/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2011Q3
Self-Identified List (Quad Cities)
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