Finding | |
|---|---|
| Title | Inadequate Design Control for Battery Sizing Calculation |
| Description | The inspectors identified a Green NCV of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion III, Design Control, because Exelon did not verify the adequacy of the low pressure coolant injection (LPCI) motor operated valve (MOV) independent power supply (IPS) with respect to the 419 volt direct current (VDC) battery sizing calculation. Specifically, non-conservative design inputs were used for the safety-related battery sizing calculation which reduced the battery capacity margin. On November 22, 2017, Exelon performed an operability determination for the identified issue and determined that the batteries had sufficient capacity. This issue was entered into the corrective action program (CAP) as issue report (IR) 4079452. The performance deficiency was determined to be more than minor because it was associated with the Design Control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, based on the quantity and magnitude of the errors, there was reasonable doubt that the LPCI MOV batteries would have adequate capacity under all design conditions. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 2 of IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, issued June 19, 2012, the finding was of very low safety significance (Green) because it was a design deficiency confirmed not to result in a loss of operability. This finding does not have a cross-cutting aspect because the calculation was last revised in 2003 so the finding is not indicative of current performance. |
| Site: | FitzPatrick  |
|---|---|
| Report | IR 05000333/2017004 Section 1R12 |
| Date counted | Dec 31, 2017 (2017Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | K Kolaczyk B Sienel E Carfang J Lilliendahl K Mangan O Masnyk-Bailey T O'Hara A Dimitriadis |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - FitzPatrick - IR 05000333/2017004 | |||||||||||||||||||||||||||||||
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Finding List (FitzPatrick) @ 2017Q4
Self-Identified List (FitzPatrick)
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