05000313/FIN-2016007-04
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Finding | |
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| Title | Inadequate Control of Monitoring for Wall Loss in the Service Water System |
| Description | The team identified a Green finding and an associated non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, because the licensee failed to implement the Microbiologically Influenced Corrosion Monitoring Program in a manner that would monitor for pipe wall loss in the service water system. Specifically, the team identified that the licensee had not maintained representative monitoring points and allowed an excessive time period between pipe wall thickness inspections. The licensees corrective actions included initiating an evaluation of the Microbiologically Influenced Corrosion Monitoring Program and documenting the issue in the corrective action program as condition reports CR-ANO-C-2016-00435, CR-ANO-C-2016-00524 and CR-ANO-C-2016-00546. The team did not identify a loss of structural integrity in any service water system pipe caused by these errors and therefore did not have an operability concern. The failure to implement the Microbiologically Influenced Corrosion Monitoring Program was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone objective and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to monitor service water system pipe locations for microbiologically influenced corrosion could result in a loss of pipe structural integrity (e.g., large pipe break) resulting in the loss of a service water train and adversely affecting safety-related equipment necessary for accident mitigation. The finding was evaluated using Inspection Manual Chapter 0609, Significance Determination Process, Attachment 0609.04, Initial Characterization of Findings, and Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 2 Mitigating Systems Screening Questions, dated June 19, 2012. The team determined the finding was of very low safety significance (Green) because the finding was a deficiency affecting the design or qualification of a mitigating system, structure or component, but the system, structure or component maintained its operability. This finding had a human performance cross-cutting aspect of Conservative Bias because the licensee failed to ensure that individuals used decision-making practices that emphasized prudent choices over those that were simply allowed. Specifically, the program database contained errors related to non-conservative decisions regarding the impact of monitoring points following pipe replacement and limiting the maximum time between monitoring for wall loss [H.14]. |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2016007 Section 4OA4 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 95003 |
| Inspectors (proximate) | B Correll C Osterholtz D Betancourt D Lackey D Willis E Duncan G Hansen J Brand J Dixon J Mateychick L Mckown M Holmberg M Keefe M Phalen N O'Keefe P Mckenna R Alexander R Deese R Kopriva R Kumana S Graves S Morrow S Rich S Smith T Hartman W Sifre Z Hollcraft |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2016007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2016Q1
Self-Identified List (Arkansas Nuclear)
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