ENS 48551
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ENS Event | |
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21:30 Dec 2, 2012 | |
Title | Inadequate Raw Water Pump Anchor Embedment |
Event Description | The raw water pumps (AC-10A/B/C/D) base plate support anchors were discovered by Fort Calhoun Station personnel to have inadequate embedment to support existing analysis. Plant drawing specify a j-bolt type of anchor with a required 16 inch embedment. Actual plant configuration was found to be a j-bolt type anchor with a 9 inch embedment. Plant design analysis requirements are not being met for the existing configuration. Existing analysis requires a minimum embedment of 60 inch for a j-bolt type anchor. There are a total of 4 anchors for each raw water pump, totaling 16 anchors. The as found condition renders all four raw water pumps inoperable.
In the current plant Mode 5 (De-fueled), Shutdown Condition, the raw water pumps are considered available per the station's Shutdown Operations Protection Plan. Raw water pumps AC-10B and AC - 10D are in service providing cooling to the Component Cooling Water System. The core is offloaded and the Component Cooling Water System is maintaining Spent Fuel Pool temperature. The licensee notified the NRC Resident Inspector. |
Where | |
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Fort Calhoun Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
Time - Person (Reporting Time:+-4.03 h-0.168 days <br />-0.024 weeks <br />-0.00552 months <br />) | |
Opened: | Klint Kudlacek 17:28 Dec 2, 2012 |
NRC Officer: | Vince Klco |
Last Updated: | Dec 2, 2012 |
48551 - NRC Website
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