05000244/FIN-2015002-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Preferred Auxiliary Feedwater Protection from Potential Block Wall Failures |
| Description | The inspectors identified a Green NCV of Title 10 of the Code of Federal Regulations (10 CFR) 50, Appendix B, Criterion III, Design Control, because Exelon did not provide for verifying or checking the adequacy of design, such as by the performance of design reviews and calculations to ensure that masonry block wall failures in the intermediate building would not challenge preferred auxiliary feedwater (AFW) piping operability. Corrective actions included installation of a temporary modification which corrected the condition, and entering this issue into the CAP. Exelon is evaluating options for a permanent modification to correct the issue. This finding is more than minor because it is associated with the design control attribute of the Mitigating Systems cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, if non-safety-related block wall 8-973-8I failed following a design basis seismic event, portions of the turbine-driven and B motor-driven AFW systems could be impacted by falling blocks. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibits 2 and 4 of IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, the performance deficiency was a deficiency affecting external event mitigation systems (seismic/fire/flood/severe weather protection degraded). The performance deficiency did not involve the degradation of equipment or function specifically designed to mitigate a seismic, flooding, or severe weather initiating event (e.g., seismic snubbers, flooding barriers, tornado doors) only a reasonable doubt regarding the operability of the turbinedriven AFW system. Therefore, the inspectors determined that this finding is of very low safety significance (Green). Additionally, the finding has a cross-cutting aspect in the area of Problem Identification and Resolution, Identification, because Ginna did not implement a CAP with a low threshold for identifying issues and individuals did not identify issues completely, accurately, and in a timely manner in accordance with the program. |
| Site: | Ginna  |
|---|---|
| Report | IR 05000244/2015002 Section 1R18 |
| Date counted | Jun 30, 2015 (2015Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | A Siwy D Dodson D Render D Schroeder E Burket N Perry S Horvitz |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
| ' | |
Finding - Ginna - IR 05000244/2015002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Ginna) @ 2015Q2
Self-Identified List (Ginna)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||