ENS 45926
ENS Event | |
|---|---|
16:33 May 13, 2010 | |
| Title | a Valve Classified as an Item Relied on for Safety Found Closed While Position Indicator Showed Open |
| Event Description | It was reported to EH&S [Environmental Health & Safety] Management that on May 13, 2010 that the XV-202-I valve actuator was showing open when the valve was closed. This valve is the Uranium Hexafluoride (UF6) eduction back-up emergency shut off valve and is credited as a protective feature for a high level condition in the hydrolysis column. This valve is a key component of an Item Relied On for Safety (IROFS) and is identified in the Integrated Safety Analysis (ISA) Summary for the conversion area of the Columbia Fuel Fabrication Facility. This IROFS designation is ADUVAP-110. No process upset occurred and the condition was discovered by the production staff during normal operation.
This notification is made based on 10CFR70 Appendix A (b) (2), 'Loss or degradation of items relied on for safety that results in failure to meet the performance requirements of 10CFR70.61.' The performance requirements for this accident sequence require the Overall Likelihood Index (OLI) be a -4, which corresponds to Highly Unlikely. With this control failure the sequence OLI is a -3 which corresponds to Unlikely. Immediate Corrective Actions: - Upon identification of the issue on May 13, production shut down conversion line 2 and generated a 'red book' to inform EH&S. - Maintenance determined the valve actuator had been installed incorrectly. - Maintenance properly installed the actuator on the valve and demonstrated proper performance. - The event has been entered into the Corrective Action Process IR# 10-134-C001. - Conversion line 2 remains shutdown pending staff management authorization for restart. - For all modifications/maintenance activity on IROFS in safety significant systems, staff management approval is required for restart of the system. The licensee believes that the valve mis-position and indication issues occurred during maintenance on the valve approximately one week prior to discovery of the condition. |
| 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:+18.35 h0.765 days <br />0.109 weeks <br />0.0251 months <br />) | |
| Opened: | Gerard Couture 10:54 May 14, 2010 |
| NRC Officer: | Bill Huffman |
| Last Updated: | May 14, 2010 |
| 45926 - NRC Website | |
Westinghouse Electric Corporation with Part 70 App A (B)(2) | |
WEEKMONTHYEARENS 542982019-09-27T19:15:00027 September 2019 19:15:00
[Table view]Part 70 App A (B)(2) Procedural Noncompliance with Administrative Item Relied on for Safety ENS 519742016-06-02T16:45:0002 June 2016 16:45:00 Part 70 App A (B)(2) Administrative Verifications of Ventilation Clean-Out Containers Were Not Performed ENS 510242015-04-29T14:00:00029 April 2015 14:00:00 Part 70 App A (B)(2) Valve Classified as Item Relied on for Safety Failed to Operate as Designed ENS 459262010-05-13T16:33:00013 May 2010 16:33:00 Part 70 App A (B)(2) a Valve Classified as an Item Relied on for Safety Found Closed While Position Indicator Showed Open ENS 458842010-04-29T17:04:00029 April 2010 17:04:00 Part 70 App A (B)(2) Hot Oil System Emergency Shutdown Fails Annual Preventative Maintenance Check ENS 449282009-03-23T11:30:00023 March 2009 11:30:00 Part 70 App A (B)(2) Degraded Item Required for Safety in the Pelleting Area ENS 438142007-11-30T16:00:00030 November 2007 16:00:00 Part 70 App A (B)(2) Potential Loss of Item Relied on for Safety (Irofs) ENS 414242005-02-19T21:04:00019 February 2005 21:04:00 Part 70 App A (B)(2) 24-Hour Criticality Control Report - Failure to Obtain Required Powder Samples 2019-09-27T19:15:00 | |