05000280/FIN-2011011-02
From kanterella
Revision as of 14:06, 30 September 2017 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Finding | |
|---|---|
| Title | Failure to Implement Design Control Measures to Verify the Adequacy of TOLs at Degraded Voltage Conditions |
| Description | The team identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to use the most conservative motor currents in the analysis to determine the adequacy of thermal overloads (TOLs) at degraded voltage conditions. The licensee entered this into their corrective action program as CR 455657, CR454839, CR454841, CR454863, CR455218, and CR 456448. The licensees failure to use the most conservative motor currents in the analysis to determine the adequacy of TOLs at degraded voltage conditions was a performance deficiency. The performance deficiency was more than minor because it was similar to Inspector Manual Chapter 0612, Power Reactor Inspection Reports, Appendix E, Example of Minor Issues , Example 3.j, which states that if the engineering calculation error results in a condition where there is now a reasonable doubt on the operability of a system or component the performance deficiency is not minor. Further, the performance deficiency was more than minor because it was associated with the design control attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to use the most conservative motor currents in the analysis to determine the adequacy of TOLs at degraded voltage conditions resulted in a reasonable doubt that the 480V safety related motors could perform their safety function. In accordance with Nuclear Regulatory Commission Inspection Manual Chapter 0609.04, Initial Screening and Characterization of Findings , the team conducted a Phase 1 Significance Determination Process screening and determined the finding to be of very low safety significance (Green) because it was a design deficiency confirmed not to have resulted in the loss of operability or functionality. The finding was reviewed for cross-cutting aspects and none were identified since the performance deficiency was not indicative of current licensee performance. |
| Site: | Surry  |
|---|---|
| Report | IR 05000280/2011011 Section 1R21 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | D Jones G Skinner B Sherbin R Nease J Eargle A Alen M Endress |
| INPO aspect | |
| ' | |
Finding - Surry - IR 05000280/2011011 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Surry) @ 2011Q4
Self-Identified List (Surry)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||