ENS 46122
ENS Event | |
|---|---|
17:27 Jul 23, 2010 | |
| Title | 24 Hour Report - Discovery That Waste Water Filter Press Not Configured for Passive Design Feature |
| Event Description | Facility:
Westinghouse Electric Company LLC, Commercial Fuel Fabrication Facility, Columbia SC, low enriched (less than or equal to 5.0 wt.% U-235) fuel fabricator for commercial light water reactors. License: SNM-1107. Time and Date of Event: July 23, 2010, 1:27 p.m. EST It was reported to EH&S Management that on July 23, 2010, two filter plates (P1 and P2) in the Integral Fuel Burnable Absorber (IFBA) waste water system filter press were found to be missing pegs utilized in the 'peg-and-hole' passive design of feature SSC-IFBA-MISC-101. The press did not contain more than the allowed four filter press plates. Operations involving the filter press were immediately stopped and EH&S notified of the event by phone and the 'Redbook' reporting system. (Redbook Issue #16126.) The actual configuration remained bounded by the analysis evaluated in the criticality safety calculations and sub-critical margins were not compromised. There was no actual safety consequence to the workers, the public or the environment. Notification is made based on 10CFR70 Appendix A (b)(1) 'Any event or condition that results in the facility being in a state that was not analyzed, was improperly analyzed, or is different from that analyzed in the Integrated Safety Analysis, and which results in failure to meet the performance requirements of 10CFR70.61.' The potential for an inadvertent criticality event was evaluated in Criticality Safety Evaluation (CSE) CSE-14-C for Miscellaneous Operations in the Integrated Fuel Burnable Absorber Area and the applicable Integrated Safety Analysis for this system. The CSE evaluated scenario's addressing the installation of the incorrect number or type of filter plates which had the potential to lead to an inadvertent criticality event. These scenarios were determined to be not-credible. Certain safeguards were identified, including SSC-IFBA-MISC-101, to maintain the basic process design of the system. Failure to identify this sequence event was credible led to that event not being included in the ISA Summary and therefore no Items Relied on For Safety (IROFS) were designated for this accident sequence. Immediate Corrective Actions: As stated previously, the IFBA area Filter Press operation was shutdown and will remain so until appropriate analysis is completed and IROFS are properly selected and identified. Similar Filter Press operations in the Uranium Recovery and Recycle System were shutdown and will remain so until appropriate analysis is completed and IROFS are properly selected and identified. This event has been entered into the Facility Corrective Action Process CAPS#10-204-C012. The licensee will inform the NRC Project Manager. |
| Where | |
|---|---|
| Westinghouse Electric Corporation Columbia, South Carolina (NRC Region 2) | |
| License number: | SNM-1107 |
| Reporting | |
| 10 CFR 70.74 APP. A | |
| Time - Person (Reporting Time:+-0.92 h-0.0383 days <br />-0.00548 weeks <br />-0.00126 months <br />) | |
| Opened: | Gerard F. Couture 16:32 Jul 23, 2010 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jul 23, 2010 |
| 46122 - NRC Website | |
Westinghouse Electric Corporation with 10 CFR 70.74 APP. A | |
WEEKMONTHYEARENS 461222010-07-23T17:27:00023 July 2010 17:27:00
[Table view]10 CFR 70.74 APP. A 24 Hour Report - Discovery That Waste Water Filter Press Not Configured for Passive Design Feature 2010-07-23T17:27:00 | |