05000331/FIN-2012002-09
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Finding | |
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Title | Licensee-Identified Violation |
Description | The licensee identified a finding of very low safety significance (Green) and an associated NCV of 10 CFR 50, Appendix B, Criterion III, Design Control, for the failure to adequately review the design of the RHR system to ensure vents were located at system high points and to ensure that design basis requirements were translated into procedures. Specifically, the licensees original design reviews in response to Generic Letter 2008-01 did not identify that vents were not located at the actual system high points, and design reviews failed to identify portions of the system which would not receive adequate flow during fill and vent operations following maintenance. Corrective actions for this issue included installing vents at the system high points (completed for the B RHR subsystem and planned for the A RHR subsystem). In addition, the licensee plans to review RHR, Core Spray, RCIC and HPCI system flow paths to ensure the systems are adequately vented during fill and vent procedures following maintenance. The issue was entered into the CAP as CR 01712033. The failure to adequately review the design of the RHR system to ensure vents were located at system high points and to ensure that design basis requirements were translated into procedures was a performance deficiency. The performance deficiency was determined to be more than minor and a finding because it was associated with the design control, procedure quality, and human performance attributes 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 (i.e., core damage). Specifically, the licensee did not identify the design inadequacy of the RHR system vent location during review of the system, and procedures used to vent the RHR system following maintenance did not ensure that all gas voids were vented. The finding screened as of very low safety significance (Green) because the finding involved a design or qualification deficiency that did not result in a loss of operability. |
Site: | Duane Arnold |
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Report | IR 05000331/2012002 Section 4OA7 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | R Orlikowski T Bilik M Mitchell M Ring L Haeg K Walton J Draper R Murray S Bell |
INPO aspect | |
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Finding - Duane Arnold - IR 05000331/2012002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2012Q1
Self-Identified List (Duane Arnold)
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