05000324/FIN-2009004-06
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Finding | |
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| Title | Capability of Emergency Diesel Generator Ventilation System to Meet Design and Licensing Requirements |
| Description | The inspectors identified a Green non-cited violation (NCV) of 10 CFR 50, Appendix B, Criterion III, Design Control, for failure to translate a key analytical assumption related to operation of the emergency diesel building back draft and check dampers into specifications and ultimately into the installed hardware. This issue was entered into the licensees corrective action program as NCR 00259088 with actions to evaluate the ability of the EDGs actual installed equipment to satisfy the intended safety function during and following the design basis tornado event. Compensatory measures were established to eliminate the concern pending the licensees determination of the systems capability to mitigate the effects of a tornado event. This finding was determined to be more than minor because the finding was associated with the Mitigating Systems Cornerstone attribute of Design Control, i.e. initial design. It impacted the cornerstone objective of ensuring the availability, reliability, and capability of the emergency diesel building ventilation to protect the EDG building structure during a design basis tornado event. Due to the deficiencies between the installed hardware and the assumptions in the calculation, the calculation did not ensure the capability of emergency diesel building ventilation system to perform the safety function. This was determined to be a failure to ensure the availability, reliability, and capability of a safety system that responds to an initiating event to prevent undesirable consequences. The licensee subsequently determined from analysis through modeling and testing that the emergency diesel building ventilation system could perform the safety function during a design basis tornado event with the existing hardware installed. The NRC reviewed this analysis and the results that determined that the existing condition did not result in the loss of the system safety function. The inspectors assessed the finding using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of findings, Table 4a for the Mitigating Systems Cornerstone. The finding was determined to be of very low safety significance (Green) because there was not an actual loss of safety system function based upon the inspectors verification of the Progress Energy analysis of the emergency diesel building ventilation system. The cause of the finding is not related to a cross-cutting aspect because the occurrence was greater than three years ago and is not indicative of current licensee performance |
| Site: | Brunswick  |
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| Report | IR 05000324/2009004 Section 4OA5 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | P Capehart G Kolcum S Rose J Polickoski J Reece C Welch R Musser R Clagg |
| INPO aspect | |
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Finding - Brunswick - IR 05000324/2009004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Brunswick) @ 2009Q3
Self-Identified List (Brunswick)
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