ENS 46776
ENS Event | |
|---|---|
05:00 Apr 22, 2011 | |
| Title | Potential Defect in Submersible Valve Position Sensors |
| Event Description | This letter is issued to provide notification of a potential defect in QualTech NP Top Potted Generation 3 Quick Disconnect Connector Pin Side assemblies installed on Topworx C7 and SV7 switches. All assemblies supplied prior to April 20, 2011 are potentially affected. These assemblies were supplied to Topworx [as] submergence qualified in accordance with our Test Report EGS-TR-23009-14. It was discovered during supplemental qualification testing that previously supplied assemblies may not properly seal against moisture intrusion if utilized in a submergence application.
The recommended corrective action for existing assemblies is to pressure test and, if required, repair them. Corrective actions already implemented will be effective in preventing recurrence of this condition. Additionally, all future assemblies will be required to pass pressure testing prior to acceptance. It has been confirmed that all assemblies previously supplied are for use in Chinese Nuclear Power Plants and therefore, no US plants are affected." Most of the assemblies are still in this country and the remainder are in Switzerland awaiting shipment. All assemblies will be recalled and pressure tested.
The purpose of this letter is to provide additional information concerning the status of all affected assemblies. As stated in the previous notifications all serial numbers affected by this defect have been identified and to date only 30 production units remain to be returned for testing/repair. We are still experiencing 100% success when repair is needed. It was previously reported that 'all affected assemblies were for use in Chinese Nuclear Power Plants and therefore no US Plants are affected'. This is no longer a correct statement. Our customer, Topworx, notified us on August 9 that one of their customers, Flowserve, had supplied valve packages containing 16 of these assemblies to Pilgrim Station in Plymouth, MA. It has been reported to us that these assemblies were never installed and are in the process of being returned for testing/repair. These 16 assemblies are included in the 30 production units remaining to be tested/repaired. It has been identified that 4 of the remaining assemblies are still in China and the other 10 were supplied to Flowserve. Additional information concerning these assemblies will be provided as it becomes available. A final letter will be issued once corrective actions for these 30 assemblies are complete. Notified R1DO(Powell), Part 21 GRP via e-mail
On April 22, 2011 QualTech NP, Huntsville issued an initial notification letter to the Nuclear Regulatory Commission and our Customer Topworx concerning a potential defect in QualTech NP Top Potted Generation 3 Quick Disconnect Connector Pin Side assemblies installed on Topworx C7 and SV7 Switches. A total of three notification/status letters associated with this subject have been previously issued. As of this date all affected production units have been returned and tested/repaired. We have experienced 100% success when repair was needed. This letter provides the final status and closeout of the above referenced 10CFR21 notification. Notified R1DO (Holoday) and Part 21 group via email. |
| Where | |
|---|---|
| Curtiss Wright Flow Control Co. Huntsville, Alabama (NRC Region 1) | |
| Organization: | Curtiss Wright Flow Control Co. |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+7.77 h0.324 days <br />0.0462 weeks <br />0.0106 months <br />) | |
| Opened: | Tony Gill 12:46 Apr 22, 2011 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jan 4, 2012 |
| 46776 - NRC Website | |
Curtiss Wright Flow Control Co. with 10 CFR 21.21 | |
WEEKMONTHYEARENS 474982011-12-05T05:00:0005 December 2011 05:00:00
[Table view]10 CFR 21.21 Part 21 Involving Defective Spring Clips Used as Seismic Restraints on Two Scientific Modules ENS 467762011-04-22T05:00:00022 April 2011 05:00:00 10 CFR 21.21 Potential Defect in Submersible Valve Position Sensors 2011-04-22T05:00:00 | |