05000305/FIN-2007011-04
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Finding | |
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| Title | Effects of Air Entrainment in ECCS Pumps |
| Description | One issue was identified by the inspectors. BKG ES-1.3 discussed the air void between the containment sump suction supply valves. The inspectors asked engineering personnel if the air volume in the piping between valves SI-350A(B) and SI-351A(B) could potentially lead to air binding of the downstream ECCS pumps. Engineering personnel provided the inspectors with CAP 024206, WNSAL 2004-007 Containment Sump Line Fluid Inventory. This CAP was generated on November 24, 2004, in response to Westinghouse Nuclear Safety Advisory Letter (WNSAL) 2004-007, Containment Sump Line Fluid Inventory, that discussed a potential vulnerability for trapped air in ECCS suction line piping. The evaluation performed for this CAP identified that Kewaunee was potentially susceptible to trapped air in the ECCS piping. This conclusion resulted in the generation of CAP 024797, Potential for Air Void in Containment Sump Recirculation Suction Line, dated January 1, 2005. Engineering personnel also provided the inspectors with an evaluation performed by a contractor that evaluated the effects of an air void in the ECCS sump suction piping. This evaluation concluded that the peak air entrainment rate would be 3 percent to 5 percent by volume over a period of 20 seconds, and that such entrainment rates would not be expected to cause any significant problems. NUREG/CR 2792, An Assessment of Residual Heat Removal and Containment Spray Pump Performance Under Air and Debris Ingestion Conditions, stated that for air quantities between 3 percent and 15 percent pump degradation depends on individual pump design and operating conditions. The inspectors asked the engineering staff if Kewaunee had an evaluation from the pump vendor that stated that 3 percent to 5 percent air entrainment would not adversely affect the ECCS pumps. On December 18, 2007, the licensee provided the inspectors with vendor information regarding the performance of the ECCS pumps. Until the inspectors complete a review of the contractors analysis and the information from the pump vendor, this issue will be tracked as an unresolved item (URI 05000305/2007011-04). The analysis and the information indicated that the pumps were operable. |
| Site: | Kewaunee  |
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| Report | IR 05000305/2007011 Section 4OA4 |
| Date counted | Dec 31, 2007 (2007Q4) |
| Type: | URI: |
| cornerstone | No Cornerstone |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 95002 |
| Inspectors (proximate) | A Dahbur K Riemer R Krsek K Barclay C Tilton V Myers J Mancusor Daleyr Orlikowski S Burgess J Geissner D Betancourt |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2007011 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2007Q4
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