05000249/FIN-2014005-01
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Finding | |
|---|---|
| Title | Unit 3A LPCI Heat Exchanger Supports Returned to Service with Unacceptable Indications |
| Description | A finding of very low safety significance and associated non-cited violation (NCV) of 10 CFR 50.55a(g)(4) was identified by the inspectors for the licensees failure to maintain American Society of Mechanical Engineers (ASME) Code Class 2 components in accordance with ASME Code Section XI requirements. Specifically, the licensee failed to repair or replace the Unit 3A Low Pressure Coolant Injection (LPCI) heat exchanger support welds identified to have unacceptable linear flaws prior to return to service. The inspectors determined that the licensees acceptance of linear flaws in the Unit 3A LPCI heat exchanger supports that are determined to be unacceptable for continued service IAW with the ASME Code Section XI, Article IWC3000 requirements was a performance deficiency (PD). The inspectors determined that the PD was more-thanminor, and a finding, because if the PD remained uncorrected it could lead to a more significant safety concern. Absent NRC identification, the LPCI support welds with unacceptable linear flaws would have remained in service without repair or replacement. This condition could potentially lead to the failure of the Unit 3A LPCI heat exchanger supports, which in turn, could lead to a potential failure of the Unit 3A LPCI heat exchanger. The inspectors reviewed the finding using Attachment 0609.04, Initial Characterization of Findings, Table 3Significance Determination Process (SDP) Appendix Router. The inspectors answered No to the question in Section A of Table 3; and therefore, evaluated the finding using the SDP in accordance with IMC 0609, The Significance Determination Process for At-Power Operations, Appendix A, Exhibit 2, Mitigating Systems Screening Questions. The inspectors answered No to the questions in Exhibit 2 and determined that this finding did not result in a deficiency affecting the structures, systems, and components (LPCI heat exchanger) to maintain its operability or functionality. Therefore, the finding was determined to have very low safety significance. The inspectors determined that this finding has a cross-cutting aspect in the area of Human Performance, training, for the licensees failure to provide training and ensure knowledge transfer to maintain a knowledgeable, technically competent workforce and instill nuclear safety values. Specifically, the licensee staff dispositioned unacceptable flaws in the LPCI heat exchanger supports for continued service using an engineering evaluation because the licensee staff lacked the specific ASME Code knowledge concerning disposition of the unacceptable indications. Therefore, the licensee failed to return the LPCI heat exchanger supports to within ASME Code acceptable flaw limits via repair or replacement prior to return to service. |
| Site: | Dresden  |
|---|---|
| Report | IR 05000249/2014005 Section 1R08 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | A Shaikh B Bartlett C Khan D Lords E Sanchez-Santiago G Roach J Cameron J Mancuso M Porfirio R Jicklin T Go |
| Violation of: | 10 CFR 50.55a |
| CCA | H.9, Training |
| INPO aspect | CL.4 |
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Finding - Dresden - IR 05000249/2014005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2014Q4
Self-Identified List (Dresden)
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