05000443/FIN-2015002-02
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Finding | |
|---|---|
| Title | Inadequate Characterization of Prompt Operability Determination of the Containment Enclosure Building |
| Description | The inspectors identified a Green NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, because NextEra did not perform an adequate POD of a safety-related plant structure. Specifically, NextEra did not appropriately categorize the operability of the CEB, a safety-related seismic Category I structure, in accordance with EN-AA-203-1001, Operability Determinations/Functionality Assessments, Revision 19, after identification of a non-conforming condition affecting the structure. NextEra entered the condition into their CAP (AR 02053991), recharacterized the operability of the CEB as Operable but Degraded, and established compensatory measures to monitor for additional structural deformation by performing routine seismic seal gap measurements. This performance deficiency was considered to be more than minor because it affected the design control attribute of the Barrier Integrity cornerstone and its objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. Specifically, the inspectors determined that the operational capability of the CEB was affected in that compensatory measures were not identified and established to monitor for any further degradation of the non-conforming condition. The finding was evaluated in accordance with IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, and determined to be of very low safety significance (Green) since it did not represent an actual open pathway in the physical integrity of reactor containment, containment isolation systems, or heat removal systems. In addition, the affected structures and components remained capable of performing their safety function. The finding is related to the cross-cutting area of Problem Identification and Resolution Evaluation, because NextEra did not thoroughly evaluate an issue to ensure that resolutions address causes and extent of condition commensurate with their safety significance. Specifically, NextEra did not appropriately characterize the CEB non-conforming condition and establish compensatory measures that were commensurate with the safety significance of the condition [P.2]. |
| Site: | Seabrook  |
|---|---|
| Report | IR 05000443/2015002 Section 4OA2 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Dionne C Newport G Dentel N Floyd P Cataldo W Cook |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Seabrook - IR 05000443/2015002 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Seabrook) @ 2015Q2
Self-Identified List (Seabrook)
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