05000348/FIN-2013004-05
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Finding | |
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Title | Licensee-Identified Violation |
Description | 10 CFR 50 Appendix B, Criterion III, Design Control, required in part that design changes, including field changes, shall be subject to design control measures commensurate with those applied to the original design. Contrary to the above, the licensee failed to implement a design change for the TDAFW pump flow orifice plates that would have installed the correct sized (1/2-inch thick) orifice plates in the TDAFW pump discharge headers during original plant construction of Unit 2. The licensee captured this issue into the CAP as CR 515901. The significance of this finding was screened using IMC 0609, Appendix A, Significance Determination Process (SDP) for Findings at Power dated July 1, 2012. The finding required a detailed risk evaluation by a senior reactor analyst (SRA) because it represented an actual loss of function of at least a single train for greater than its TS allowed outage time. Consequently a detailed risk evaluation was performed by an SRA. The bounding analysis showed that the change in core damage frequency was less than 1E-6, and should therefore be treated as a Green finding. The main drivers for the low risk result were; the low likelihood of events which would reveal the performance deficiency and the lack of common cause applicability to other AFW flow orifices. This violation is associated with Unit 2 LERs 05000364/2012-001-00 and -01. |
Site: | Farley ![]() |
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Report | IR 05000348/2013004 Section 4OA7 |
Date counted | Sep 30, 2013 (2013Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | D Dumbacher F Ehrhardt P Niebaum J Sowa |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
INPO aspect | |
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Finding - Farley - IR 05000348/2013004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2013Q3
Self-Identified List (Farley)
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