05000331/FIN-2013002-02
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Finding | |
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| Title | Failure to Ensure Operability of Low Pressure Coolant Injection Following a Postulated LOCA in Mode 3 |
| Description | A finding of very low safety significance (Green) and associated non-citied violation 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors for the failure to ensure the low pressure coolant injection (LPCI) mode of operation of residual heat removal (RHR) would be capable of performing its mitigating function while in Mode 3 following a postulated loss of coolant accident (LOCA). The licensee documented the issue in the CAP as CRs 01625023, 01626334, and 01776321. Corrective actions included the development of mitigating actions to manually realign RHR to LPCI mode should a LOCA occur while in Mode 3 to ensure system operability. The performance deficiency was determined to be more than minor because the finding was associated with Mitigating System Cornerstone attribute of Equipment Performance and affected the cornerstone objective of ensuring the capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, under the postulated conditions, steam voiding could occur within the RHR system and impact the ability of LPCI to respond during a postulated Mode 3 LOCA. The finding required a Phase II SDP evaluation because the operability of the LPCI system was determined to be impacted. Based on the Phase II SDP risk-analyses and SAPHIRE analysis developed by the regional senior risk analyst (SRA), the inspectors determined the finding was of very low safety significance. The inspectors determined this finding had a cross-cutting aspect in the area of Problem Identification and Resolution, having Operating Experience (OE) components, and involving the licensee systematically collecting and evaluating relevant internal and external OE. Specifically, the licensees evaluation of Information Notice 2010-11 did not result in a detailed evaluation for potential issues related to the OE. |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2013002 Section 1R21 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | J Corujo Sandin L Haeg R Murray S Bell B Orlikowski |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Duane Arnold - IR 05000331/2013002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2013Q1
Self-Identified List (Duane Arnold)
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