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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 47498 | 5 December 2011 05:00:00 | 10 CFR 21.21 | Part 21 Involving Defective Spring Clips Used as Seismic Restraints on Two Scientific Modules | The following information was received via fax: The purpose of this letter is to notify you of a defect in spring clips that form part of the seismic restraint for Scientech CON2000-701 and RTD2100-7403 modules. Details of the defect are provided below and in the attached Technical Bulletin Volume 38, CON2000 and RTD2100 Spring Clips, dated December 2011. The written report shall include, but need not be limited to, the following information, to the extent known: (i) Name and address of the individual or individuals informing the Commission. Michael Weinstein Director of Quality Operations Scientech, a business of Curtiss-Wright Flow Control Corporation 44 Shelter Rock Road Danbury, CT 06810 Scott Robuck General Manager Scientech, a business unit of Curtiss-Wright Flow Control Corporation 200 S. Woodruff Avenue Idaho Falls, ID 83401 (ii) Identification of the basic component supplied for such facility or such activity within the United States which fails to comply or contains a defect. PID controller, manufactured by Scientech, Model CON2000-701, Part No. NUS-A056PA RTD converter, manufactured by Scientech, Model RTD2100-7403, Part No. NUS-A121PA (iii) Identification of the firm supplying the basic component which fails to comply or contains a defect. Scientech, a business unit of Curtiss-Wright Flow control Corporation 200 S. Woodruff Avenue Idaho Falls, ID 83401 (iv) Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect or failure to comply. The CON2000-701 is replacement for the obsolete Bailey Meter Company 701 PID controller. It is a panel mounted module that is retained in the panel during seismic events by a spring clip on the top of the modules (part number NUS-P089DB-13) that engages a detent in the panel. The module can be pulled out about one inch out of the rack before the spring clip prevents further movement; full removal requires pressure on the spring clip to disengage the detent. The module was seismically tested as documented in Qualification Report NUS-A056QA Rev 2. During the CON2000 test, a minor anomaly occurred and was accepted by Scientech as not affecting the qualification results. Recently a client questioned Scientech's acceptance of the anomaly and requested a retest. Scientech agreed to retest the module; the RRS used is attached. During the retest, the spring clip failed to adequately restrain the module. The balance of the replacements for the Bailey 7000 series - the NUSI 2000 series - are cabinet mounted modules. When they are reconfigured for shelf or panel mounting they become part of the NUSI 2100 series, and the seismically qualified units use the same spring clip. The RTD2100-7403 is the only safety related panel mounted module sold as of December 2011 with the deficient spring clip. Investigation revealed that the original clip was made of 0.025" thick spring steel. After the seismic qualification test was performed, Revision 4 to NUS-F089DB-13 altered the characteristics of the retaining clip, reducing the force required to disengage the detent. The metal was changed to SS301 stainless steel and the thickness reduced to 0.015" thick. Scientech's design change process required an evaluation of the impact of the change; the evaluation was complet4ed, but did not address the impact on seismic qualification adequately. These controllers could be mounted in the in the main control room control panels. The failure of the seismic clip could result in the controllers coming out of the panels, impacting other safety related equipment or personnel, and failing to properly control their actuated devices during a seismic event. (v) The date on which the information of such defect or failure to comply was obtained. Submitted for evaluation 11/30/11; evaluation completed 12/2/11. (vi) In the case of a basic component which contains a defect or fails to comply, the number and location of these components in use at, supplied for, being supplied for, or may be supplied for, manufactured, or being manufactured for one or more facilities or activities subject to the regulations in this part. PLANT CON2000-701 RTD2100-7403 Clinton 4 0 Davis Besse 8 0 Monticello 2 0 Perry 4 0 Susquehanna 20 7 TOTALS 38 7 (vii) The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action. 1. All five plants were notified and provided with a technical bulletin addressing the problem and the proposed solution. 2. Scientech is expedition procurement of the correct spring clips and will supply them to all affected plants. They can be readily changed out on site. 3. Scientech had previously strengthened its design review process to specifically remind reviewers to evaluate the impact on and need for additional qualifications testing. 4. Scientech will review this event with all engineering staff and emphasize the need for correct reviews. (viii) Any advice related to the defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees. See attached Technical Bulletin. (provided separately) (ix) In the case of an early site permit, the entities to whom an early site permit was transferred. Not applicable. Should you have any questions regarding this matter, please contact Robert Queenan, Operations Manager, Scientech/NUS Instruments, at (208) 524-9311. | ||
| ENS 46776 | 22 April 2011 05:00:00 | 10 CFR 21.21 | 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.
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. |