05000341/FIN-2017010-01
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Finding | |
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| Title | Failure to Account for Internal Heat Rise for Protective Devices Settings |
| Description | Green . The inspectors identified a finding of very -low safety significance (Green) and an associated NCV of Title 10 of the Code of Federal Regulations (CFR) , Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to ensure that the protective devices installed in Motor Control Centers ( MCCs ) would not spuriously trip during design basis events. Specifically, the licensee did not account for 18 degrees Fahrenheit (F) heat rise inside the MCCs. Protective devices inside MCCs located in harsh environment were evaluated and sized for a maximum elevated temperature up to 156 degrees F instead of 174 degrees F . The licensee captured the inspectors concern into their Corrective Action Program ( CAP ) as CARD 17 -24412. The performance deficiency was determined to be more- than- minor because it was associated with the Mitigating Systems cornerstone attribute of design control and affected the cornerstone objective of ensuring the availability, reliability, and capability of mitigating systems to respond to initiating events to prevent undesirable consequences. The finding screened as of very -low safety significance (Green) because it did not result in the loss of operability or functionality of mitigating systems. Specifically, as an immediate corrective action, the licensee performed a preliminary evaluation that reasonably concluded the overcurrent protection devices within the scope of DC -6475 would not spuriously trip. The finding did not have a cross -cutting aspect associated with it because it was not representative of current performance. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2017010 Section 1R21 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dahbur I Khan J Robbins M Greenleaf M Jeffers |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Fermi - IR 05000341/2017010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2017Q2
Self-Identified List (Fermi)
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