ML11234A046
| ML11234A046 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/12/2011 |
| From: | Gill T Curtiss-Wright Flow Control Corp |
| To: | Office of Nuclear Reactor Regulation, NRC/RGN-II |
| References | |
| 46776 | |
| Download: ML11234A046 (6) | |
Text
0811212011 U.S. Nuclear Regulatory Commission OperationsCenter Event Report Page I Part 21 (PAR) Event# 46776 Rep Org: CURTISS WRIGHT FLOW CONTROL CO. Notification Date I Time: 04/22/2011 12:46 (EDT)
Supplier: CURTISS WRIGHT FLOW CONTROL CO. Event Date I Time: 04/22/2011 (CDT)
Last Modification: 08/12/2011 Region: 1 Docket #:
City: HUNTSVILLE Agreement State: Yes County: License #:
State: AL NRC Notified by: TONY GILL Notifications: PART 21 GROUP HQ Ops Officer: MARK ABRAMOVITZ JONATHAN BARTLEY R2DO Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 UNSPECIFIED PARAGRAPH POTENTIAL DEFECT IN SUBMERSIBLE VALVE POSITION SENSORS "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.
- UPDATE RECEIVED VIA FAX FROM TONY GILL TO JOE O'HARA AT 1545 ON 8/12/11 ***
"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.
08/12/2011 U.S. Nuclear Regulatory Commission OperationsCenter Event Report Pare2 Part 21 (PAR) Event# 46776 "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 R1 DO(Powell), Part 21 GRP via e-mail
QualTach 125 West'Park Loop Huntsville, AL 35806 I Phone: 256.722.8500 . Fax: 250.722.8533 www.sderifech. corn
%d)Flow ControlCompany QualTech NP FAX TRANSMITTAL DATE: \ý--\L-,\
TO:
FAX NO:
FROM:
COMMENTS/INSTRUCTIONS:
TRANSMITTAL INCLUDES COVER SHEET PLUS _ _ PAGE(S).
I Huntsville Operations l 25West Park Loop SjFMow Cotrl omcW Huntsville, AL 35806 Quarrech NP 256-722-8500 (File No.: QTHuntsvillel OCFR21-2011-01)
August 12, 2011 To whom it may concern:
On April 22, 2011 QualTcch 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 copy of that letter and the May 24, 2011. follow up letter are attached for information.
The purpose of this letter is to provide additional information concerning the statug 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.
If you require additional details or would like to discuss this further please contact me at 256-722-8500 ext. 131 (office), 256-426-4558 (cell) or tgill@curtisswright.com.
Sincerely, Tony Gill Quality Assurance Manager QualTech NP, Huntsville Operations a business unit of Curtiss-Wright Flow Control Company http://qualtechnp.ewfe.com
I 4W" -
a]wd r , Huntsville Operations 125 West Park Loop 0 WCon I TComanMP GwptTech Huntsville. AL 35806 256-722-8500 (File No.: QTHuntsv. lie IOCFR21-201 1-01)
May 24, 2011 To whom it may concern:
On April 22. 2011 QualTech NP, Huntsville issued an initial ýnotification 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 C? and SV7 Switches. A copy of that letter is attached for information. Based on the initial notificiion and investigations since. the following conclusions are provided.
All serial numbers affected by this defect have been identified! and approximately half of those have been repaired with 100% success. The remaining assemblies are in prdcess of being returned and it is cxpected that all affected assemblies will be repaired or replaced widhin the next" sixty days.
The identified probable causes for the potential defect have been corrected. The assembly instruction was revised to properly define the setscrew sealing process and it is! now a requirement that 100% of completed assemblies are post production tested to verify pressure inte-rity. These implemented corrective actions will be effective in preventing recurrence of this condition.
It has been confirmed that all assemblies previously supplied are for use in Chinese Nuclear Power Plants and therefore no US Plants are affected.
If you require additional. details or would like to discuss this further please contact Tony Gill at 256-722-8500 ext. 131 (office). 256-426-4558 (cell) or L-i1.1_a c ,. for additional information, Sincerely, Kurt Mitchell General. Manager QualTech NP, a business unit of Curtiss-Wright Flow Control Conipany Office 301.854.3432 http://qualteclnp.cvfc.com krnitchell.curtisswright.corn
I JWWU M~r"Huntsvi lie Operations 0 FOW Co t 1.25 West Park Loop
..... w nrol qompany Huntsvile, AL 35806 Qua Tech VP 256-722-8500 (File No.: QTHuntsvillelOCFR21-20 1-01)
April 22. 2011 To whom it may concern:
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 quaJified 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 ifutilized in a submergence application.
Investigations revealed two probable causes for the potential defect, The primary cause was due to inadequate assembly instructions concerning setscrew sealing. A secondary cause was post production testing did not require verification of pressure integrity for this type of connector/switch assembly.
One hundred thirty six assemblies with the potential defect were still in inventory at our facility, All one hundred thirty six were pressure tested to verify pressure integrity. Thirty two were found to be leaking and required repair. A repair instruction was generated and thirty one were repaired (one was rejected due to a visual defect). All thirty one repaired assemblies passed the pressure test confirming the instruction was adequate to fix the leak. Additionally, the affected assembly instruction was revised to better define and control the set screw sealing process and an additionaJ 50 assemblies were built using the revised instruction. All fifty of these assemblies passed the pressure test confirming that die revised instruction was effective in preventing the leakage.
The recommended corrective action for existing assemblies is to pressure test and if required repair them in tile same manner as those identified above. 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.
Additional details will be provided. in the formal written report, Please contact Tony Gill at 256-722-8500 ext. 131 (office), 256-426-4558 (cell) or hzicl..*cutiswighcom for additional information, Sincerely, Kurt Mitchell General Manager QualTech NP.. a business unit of Curtiss-Wright rlow Control Company Office 301.854.3432 http://qualtechnp.cwfc.com kmitcbell@curtisswright.com