05000382/FIN-2014007-04
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Finding | |
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| Title | Failure to Evaluate Missile Protection Requirements for Emergency Diesel Generator Day and Storage Tank Vents |
| Description | The team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states, in part, 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. Specifically, prior to November 6, 2014, the licensee failed to verify the adequacy of design of the vents for the emergency diesel generator A and B day tanks and storage tanks to withstand impact from a wind-driven missile, or to evaluate for exemption from missile protection requirements using an approved methodology. In response to this issue, the licensee performed an evaluation using the TORMIS computer simulation code that supported a determination of operability and a future licensing basis change. TORMIS is a methodology described in Electric Power Research Institute (EPRI) Technical Report NP-2005, Tornado Missile Simulation and Design Methodology, dated August 1981, which was approved for use by Waterford in the Safety Evaluation related to License Amendment 168. This finding was entered into the licensees corrective action program as CR-WF-2014-05131, CR-WF3-2014-5341, and CR WF3-2014-5412. The team determined that the failure to evaluate the lack of missile protection on the emergency diesel generator A and B day and storage tank vents was a performance deficiency. This performance deficiency was more than minor because it was associated with the design control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to events to prevent undesirable consequences. Specifically, the licensee failed to evaluate a design nonconformance on the emergency diesel generator A and B day and storage tank vents for lack of missile protection. In accordance with Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, dated June 19, 2012, Exhibit 2, Mitigating Systems Screening Questions, this finding screened as having very low safety significance (Green) because it was a design or qualification deficiency that did not represent a loss of operability or functionality; did not represent an actual loss of safety function of the system or train; did not result in the loss of one or more trains of non- technical specification equipment; and did not screen as potentially risk-significant due to seismic, flooding, or severe weather. The team determined that this finding did not have a cross-cutting aspect because the most significant contributor did not reflect current licensee performance. |
| Site: | Waterford  |
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| Report | IR 05000382/2014007 Section 1R21 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | B Larson E Ruesch G Gardner G Ottenberg P Wagner S Makor |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
| INPO aspect | |
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Finding - Waterford - IR 05000382/2014007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2015Q1
Self-Identified List (Waterford)
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