05000317/FIN-2009004-01
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Finding | |
|---|---|
| Title | Saltwater Pump Pit Flooding Event |
| Description | The inspectors identified an unresolved item (URI) associated with an internal flooding event involving the No. 21 SW pump pit that occurred on December 10, 2008. On December 10, 2008, operators observed several feet of SW in the No. 21 SW pump pit. Operations secured the No. 21 SW pump and requested maintenance personnel to evaluate and perform repairs as necessary. Following the flooding event, maintenance personnel identified a clogged floor drain in the SW pump pit, degraded packing gland bolts and a failed radial bearing. The inspectors reviewed the initial CR describing an excessive packing leakage on the No. 21 SW pump, the maintenance work activity, and the flooding analysis for the intake structure. The inspectors questioned if the submergence event caused the lower radial bearing failure since Constellation did not include this degraded condition in their CAP. The inspectors also questioned the validity of the flooding analysis since the SW pump pits have design considerations and provisions to ensure the pumps would not be submerged. The inspectors reviewed the design considerations and provisions, the maintenance order used to overhaul the No. 21 SW pump, and supporting operability documents for the pump. Constellation provided information about the effect of Intake Structure flooding on the SW pumps. The inspectors reviewed the information and had additional questions on the supporting information used to support the operability basis of the SW pump and the design considerations associated with the SW pump pit. This item is unresolved pending further review and investigation of Constellations design considerations, provisions, and additional supporting information of the intake structure flooding of the SW pump pits such that the inspectors can determine if there is a performance deficiency associated with design control of the pump operating in a submerged environment |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2009004 Section 1R06 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | D Schroeder M Davis G Dentel S Kennedy T Hoeg S Sanchez J Tomlinson R Rolph M Halterd Silkm Davis K Young D Johnson S Barr G Dentel N Perry R Rolph J Hawkins |
| INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2009Q3
Self-Identified List (Calvert Cliffs)
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