05000483/FIN-2008008-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | SAFETY-RELATED 125 Vdc Station Battery NK11 Inadequate Battery Sizing Calculation |
| Description | The team identified a non-cited violation 10 CFR 50, Appendix B, Criterion III, Design Control, for failure to verify the adequacy of design and for failure to correctly translate the 125 Vdc system design basis into instructions, procedures, and drawings. Specifically, the licensee failed to include momentary loads in the battery sizing calculation, thus reducing the peak load demand voltage during the first minute of an event, an intermediate scenario event, and the last minute of the battery duty cycle. Additionally, the licensees subsequent review determined that the calculation had failed to include three additional momentary loads. The failure to include these loads prevented the licensee from developing a battery duty cycle profile that conforms to the guidance of IEEE 485-1983 and correctly simulates the battery loads following a design basis or station blackout event. The licensee entered this finding into their corrective action program as Callaway Action Request 200808609. The failure to account for all loads, including momentary loads, in the battery design calculation was a performance deficiency because it prevented the licensee from correctly analyzing available voltage at safety-related components during the battery peak loading periods. The finding was more than minor because it is associated with the Design Control attribute of the Mitigating Systems cornerstone objective of ensuring the availability, reliability, and capability of the safety-related battery systems to respond to initiating events and prevent undesirable consequences. Using the Manual Chapter 0609, Phase 1 screening worksheet, the issue screened as having very low safety significance because adequate margins had been included in the battery selection and, therefore, the issue was a design deficiency confirmed not to result in loss-of-operability in accordance with NRC Manual Chapter Part 9900, Technical Guidance, Operability Determination Process for Operability and Functional Assessment. (Section 1R21.b.1) |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2008008 Section 1R21 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | G George P Gage W Sifre |
| INPO aspect | |
| ' | |
Finding - Callaway - IR 05000483/2008008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Callaway) @ 2008Q3
Self-Identified List (Callaway)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||