05000324/FIN-2007006-01
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Finding | |
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| Title | Capability of Emergency Diesel Generators to Meet Design and Licensing Requirements |
| Description | The team identified an Unresolved Item (URI) for failure to translate a key analytical assumption related to operation of the back draft and check dampers into specifications and ultimately into the installed hardware. The teams review of design calculation 0VA- 0033, Tornado Analysis of Diesel Generating Building, Rev. 1 identified the following concerns: nAssumption 7 of this calculation stated that the back draft/check dampers are assumed open in the normal outward flow direction during an atmospheric depressurization event associated with a tornado. The assumption also states that during the subsequent atmospheric repressurization associated with a tornado, the back draft/check dampers would open in the reverse direction to allow reverse inward flow when the Differential Pressure (dP) across damper exceeds 80 psf. There was no surveillance to verify the ability of the back draft/check dampers to open in reverse direction. Furthermore, the teams review of specification 226-002, Sheet Metal Work, Rev. 12; drawings SHW-D-10490, SHW P 2230 Backdraft Damper w/Extra Deep Frame, Rev. C and 9527-01-4283, Technocheck Valve, Rev. 0 (check damper); walk down observations; and interviews with plant personnel identified that the installed back draft and check dampers could not open in the reverse direction. Therefore, conclusions of the calculation 0VA-0033 about the maximum dPs for the structures and the ductwork were not valid or conservative. nAdditionally, this calculation and the design specification failed to address the effects of the high dP predicted in this calculation on the EDG building HVAC hardware other than the ductwork (e.g., in-line fans, recirculation dampers, etc). Progress Energy had not verified that the specified assumptions were translated into the procured and installed HVAC hardware for the EDG building. The analysis for the EDG building HVAC system did not assure that the critical analytical assumption were implemented; thus making it undetermined that the EDG building HVAC system, that serviced all four (4) EDGs for both units of Brunswick Nuclear Plant, would function during and following the design basis tornado. This condition has existed since original plant licensing. This finding 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. This issue is identified as URI 05000325/2007006, 05000324/2007006- 01, Capability of Emergency Diesel Generators to Meet Design and Licensing Requirements. This item is unresolved pending NRC review of the of the licensees analysis of the effects of the as-built configuration on the EDG building HVACs ability to satisfy the intended safety function during and following the design basis tornado event. |
| Site: | Brunswick  |
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| Report | IR 05000324/2007006 Section 1R21 |
| Date counted | Dec 31, 2007 (2007Q4) |
| Type: | URI: |
| cornerstone | No Cornerstone |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | W Lewis G Skinner M Shlyamberg S Rose J Hamman G Khouri S Rutledge K Miller |
| INPO aspect | |
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Finding - Brunswick - IR 05000324/2007006 | |||||||||||||||||
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Finding List (Brunswick) @ 2007Q4
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