ENS 44928
ENS Event | |
|---|---|
11:30 Mar 23, 2009 | |
| Title | Degraded Item Required for Safety in the Pelleting Area |
| Event Description | Reason for Notification
Notification is being made based on following criteria: '10 CFR 70 Appendix A (b)(2) Loss or degradation of IROFS [Items Relied On For Safety] that result in failure to meet the performance requirements of 10CFR70.61' WEC CFFF [Westinghouse Electric Company, Commercial Fuel Fabrication Facility) has identified a degraded IROFS condition exists in the Pelleting Area. Safety Bulletin No: M-01-09-01, issued by GE FANUC has been evaluated by CFFF Engineering and this evaluation has identified a degraded IROFS condition exists in the Pelleting Area. GE PLC of the type discussed in the Safety Bulletin (IC695CPU310) is used in Pelleting Area Furnaces 1B, 2B, and 4C. This common mode failure is applicable to IROFS PELSINT-903, PELSINT-904, & PELSINT-905. These IROFS are preventive controls for a Hydrogen Deflagration Event in the sintering furnaces. While several potential initiating sequences can lead to this event, the only scenario where the performance requirements are not met due to this degraded condition is if the furnace is above the auto ignition temperature for hydrogen and the PLC CPU fails as the furnace is cooling, then the hydrogen shut-off valve could remain open with a potential to result in an explosive atmosphere in the furnace. This event is evaluated in the CFFF ISA-08 Summary for the Pelleting Area. See Reason for Notification. Impacted Pelleting Area Furnaces are 1B, 2B and 4C. Furnace 1B is currently at normal operating temperature (above auto ignition temperature) and in operation with approximately 550 kg's of Uranium. The other two Furnaces, 2B and 4C are currently at normal temperature (above auto ignition temperature) with no uranium present in either furnace." The licensee will contact NRC Region 2. |
| Where | |
|---|---|
| Westinghouse Electric Corporation Columbia, South Carolina (NRC Region 2) | |
| License number: | Snm-1107 |
| Reporting | |
| Part 70 App A (B)(2) | |
| Time - Person (Reporting Time:+-0.65 h-0.0271 days <br />-0.00387 weeks <br />-8.9037e-4 months <br />) | |
| Opened: | Gerard Couture 10:51 Mar 23, 2009 |
| NRC Officer: | Vince Klco |
| Last Updated: | Mar 23, 2009 |
| 44928 - NRC Website | |
Westinghouse Electric Corporation with Part 70 App A (B)(2) | |
WEEKMONTHYEARENS 542982019-09-27T19:15:00027 September 2019 19:15:00
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