05000461/FIN-2011003-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Based on an issue identified at another facility, the licensee initiated AR 01197314 to verify that the normally voided section of the RHR system containment spray piping had been properly analyzed for dynamic loading during spray initiation. The licensee determined that General Electric Design Specification 22A3139, Residual Heat Removal, specified a dynamic loading analysis, which was required by American Society of Mechanical Engineers Code,Section III, for the normally voided section of piping; however, the licensee was unable to locate the analyses or justification for not performing the analyses. The licensees initial evaluation as documented in calculation 3C10-0175-001, Design and Analysis of Clinton Containment Spray System, was based on a review of Electric Power Research Institute Topical Report (TR)-106438, Water Hammer Handbook for Nuclear Plant Engineers and Operators. The evaluation concluded that a severe water hammer would not occur based on the condition that the valves required to open were slow acting. However, the licensee determined the evaluation was based on the case of a valve closing and not on the actual condition of a valve opening and a slug of water moving through the voided section of pipe. The licensee then performed an analysis of a water slug and confirmed the system remained operable. Failure to have a dynamic loading analysis for this piping as required by the design specification was considered a violation of 10 CFR 50, Appendix B, Criterion III, Design Control. This violation was not greater than Green because the dynamic loading was verified to be within the capability of the piping design. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2011003 Section 4OA7 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | S Mischke A Dunlop B Kemker C Brown D Lords J Cassidy M Jones M Ring R Winter |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2011003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2011Q2
Self-Identified List (Clinton)
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