05000389/FIN-2014008-02
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | A licensee-identified violation of 10 CFR 50, Appendix B, Criterion III, was discovered in March 2014, during a planned visual inspection of the upper internals in SG-2A and SG-2B. The licensee identified damage to the feedring in both steam generators as a result of a thermal-hydraulic transient. The transient caused an increase in feedring pressure, damage to the feedring supports, and increased stresses on the feedring piping and feedwater nozzle. The transient was attributed to leakage from the feedring bolted inspection covers, which were modified in 2011 through the engineering change process. 10 CFR 50, Appendix B, Criterion III, Design Control, states that design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. Contrary to the above, on January 18, 2011, the licensee failed to establish design control measures that provided for verifying or checking the adequacy of the modified feedring inspection cover design to maintain the safety related function of the steam generators. The modification replaced the feedring inspection covers, the gaskets, and the bolts lock washers in SG-2A and SG-2B. However, in March 2014, the modification was determined to be inadequate, resulting in leakage through the bolted inspection covers and consequently in a thermal hydraulic transient that affected the safety-related portion of the steam generators. This violation was determined to be of very low safety significance (Green) because SG-2A and SG-2B maintained their operability and functionality, and therefore resulted in no loss of safety function. The licensee entered this violation in the corrective action program as AR 01951667. |
| Site: | Saint Lucie  |
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| Report | IR 05000389/2014008 Section 4OA7 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Butcavage J Rivera Ortiz O Lopez Santiago |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Saint Lucie - IR 05000389/2014008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Saint Lucie) @ 2014Q2
Self-Identified List (Saint Lucie)
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