05000416/FIN-2009006-02
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Finding | |
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| Title | Non-conservative Bias in Instrumentation Used for Standby Service Water Leak Detection |
| Description | The team identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for failure to establish adequate measures for the selection and review for suitability of equipment and processes that are essential to the safety-related functions of structures, systems and components. Specifically, the licensee failed to properly design for pulsation effects on flow rate instrumentation used for leak detection in the Standby Service Water system. This instrumentation is needed to meet licensee commitment 10 CFR Part 50, Appendix A, General Design Criterion 13, Instrumentation and Control, to monitor trends in the ultimate heat sink basin inventory with the system in operation. The system was designed to detect a leakage rate of 1250 gallons per minute, and alarm in the control room at this leak rate, but due to design inadequacies in the instrumentation, the leak rate would have to exceed 3350 gallons per minute before activating the alarm. The licensee has entered this into their corrective action program as CR-GGN-2009-00054.This finding was more than minor because it affected the mitigating systems cornerstone attribute of equipment performance of ensuring the availability, reliability, and capability of systems that respond to initiating events. Also, using Inspection Manual Chapter 0612, Power Reactor Inspection Reports, Appendix B, Section1-3, Screen for More than Minor ROP, question 2, the finding is more than minor because if left uncorrected, the performance deficiency would have the potential to lead to a more significant safety concern. Using the Inspection Manual Chapter0609, Significance Determination Process, Phase 1 Worksheets, the finding was determined to have very low safety significance (Green) because it was not a design issue resulting in loss of function, did not represent an actual loss of a system safety function, did not result in exceeding a Technical Specification allowed outage time, and did not affect external event mitigation. The finding was reviewed for crosscutting aspects and none were identified |
| Site: | Grand Gulf  |
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| Report | IR 05000416/2009006 Section 1R21 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | I Anchondo C Ryan C Edwards T Famholtz K Clayton R Kopriva J Adams M Runyan M Bloodgood J Nicely |
| INPO aspect | |
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Finding - Grand Gulf - IR 05000416/2009006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2009Q2
Self-Identified List (Grand Gulf)
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