05000317/FIN-2009002-00
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Finding | |
|---|---|
| Title | Auxiliary Feedwater Pump Room Emergency Ventilation Low Flow |
| Description | The inspectors identified an unresolved item (URI) associated with the performance evaluations (PE-1-36-1-O-M and PE-2-36-2-O-M) used to determine if the AFW emergency ventilation system performs satisfactorily in service for Units 1 and 2. Specifically, the performance evaluation did not incorporate the requirements and acceptance limits contained in the Updated Final Safety Analysis Report (UFSAR). Following the inspectors concerns about the AFW pump room emergency ventilation system configuration, Constellation measured the AFW pump room emergency ventilation flow rates. The results of the tests revealed that the flow rates were less than the design requirement stated in the UFSAR. The UFSAR stated, in part, that the emergency ventilation can circulate 2,000 cubic feet per minute (CFM) of air between the mechanical room of the Auxiliary Building at Elevation 50 and the AFW pump room of the Auxiliary Building at Elevation 120. However, Constellation found that the flow rates for each AFW pump room emergency ventilation fan were less than 2,000 CFM. Constellation entered this issue into their CAP for resolution as CR-2008- 002833 and CR-2009-000650 and performed a re-analysis using the degraded flow rates. As a part of the degraded flow rate review, the inspectors identified that the performance evaluation used to determine the equipment performance of the emergency ventilation fan operation did not incorporate the requirements contained in the UFSAR. The inspectors noted that the monthly performance evaluation only checked for air being drawn into the AFW pump room with no acceptance criteria. The inspectors determined that a performance deficiency existed in that Constellation did not establish an adequate test program to assure that the AFW pump room emergency ventilation system would perform satisfactorily in service. Specifically, the performance evaluation did not contain acceptance limits. This resulted in Constellation not recognizing that the AFW pump room emergency ventilation system did not meet the design requirements stated in the UFSAR. This item is unresolved pending further review and investigation of past operability concerns such that the inspectors can determine if the performance deficiency is more than minor. The inspectors need to review the inputs and assumptions used in the re-analysis to determine if the degraded flow rate adversely affected the Mitigating System cornerstone objective to ensure the availability, reliability, and capability of the AFW steam driven pumps |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2009002 Section 1R15 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | O Ayegbiso M Halter D Silk M Davis C Cahill M Modes B Haagensen G Dentel S Kennedy H Balian N Perry R Rolphg Dentels Kennedy R Rolph K Mangan M Davis |
| INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2009Q1
Self-Identified List (Calvert Cliffs)
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