ENS 51303
ENS Event | |
|---|---|
04:00 Jun 11, 2015 | |
| Title | Part 21 Interim Report - Potential Defect on P/N 535-601 Moore Industries Milliamp Modules |
| Event Description | The following information is a summary that was excerpted from a facsimile received from ATC-Nuclear:
The basic component which is the subject of this notification is identified as Moore Industries Milliamp Module with part number (P/N) 535-601 (alternate P/N: 535-601-SSTRV) which has been provided individually and/or contained within a STS 535 Single Loop Process Controller. On December 22, 2014, ATC Nuclear received a 535 controller from Detroit Edison (DTE) with a failed Milliamp Module (P/N 535-601). The customer requested ATC Nuclear to perform a failure analysis to determine the cause of no output (0 Ma) on output 2 of the 535 controller. ATC Nuclear initiated a failure analysis in January 2015 that was broken down into several stages to determine the cause of the Milliamp Module failure. ATC Nuclear is continuing to evaluate the cause of the Milliamp Module failure and has preliminarily identified workmanship issues with a surface-mount fuse that is installed in the Milliamp Modules. ATC Nuclear has provided the results of the analysis to Moore Industries and Littelfuse to support or refute the workmanship concerns. Preliminary information provided by Littelfuse on June 11, 2015, was sufficient evidence to identify the existence of a deviation potentially associated with a substantial safety hazard (i.e., discovery as defined in 10 CFR Part 21). This information was documented as part of CAR 15T-24. Evaluation of reportability in accordance with 10 CFR Part 21 was not able to be completed within the 60 day evaluation period. The discovery date of the deviation requiring evaluation under 10 CFR Part 21 is June 11, 2015. ATC Nuclear has preliminarily identified a total of 285 Milliamp Modules with P/N 535-601 that have been supplied to customers by ATC Nuclear since 2010. However, there is not sufficient evidence to establish that all Milliamp Modules supplied to customers have defective Littelfuse surface-mount fuses (P/N 0448.100MR) installed. ATC Nuclear will continue to work with Moore Industries and Littelfuse to define the population of Milliamp Modules that potentially have a defective surface-mount fuse installed. This information will become available once our 10 CFR Part 21 evaluation is completed. ATC Nuclear is reviewing customer purchase orders for Milliamp Modules to identify the population of Milliamp Modules that potentially have a defective surface-mount fuse installed. Additionally, ATC Nuclear is working with Moore Industries to purge its stock of potentially defective fuses. Additional time is needed to evaluate the condition of new surface-mount fuses and it is expected that this evaluation will be completed no later than October 9, 2015. Littelfuse identified a very low failure rate (< 0.001 %) in a preliminary report issued June 2015 spanning approximately an eighteen month period commencing January 2014. There were 356,250 fuses manufactured during this period. Littelfuse is conducting a more thorough review of this failure mechanism. There is no additional advice at this time. For additional information, contact the following; Ray Chalifoux Vice President QA, ATC-Nuclear 777 Emory Valley Road, Oak Ridge, TN 37830 (865) 384-0124
The following information is a synopsis of information received via facsimile: ATC Nuclear has concluded that the identified deviation could be considered a defect on the surface-mount fuses supplied by Littelfuse. However, ATC Nuclear determined that it does not have the capability to complete a 10 CFR Part 21 evaluation to determine if a substantial safety hazard exists. A total of 285 Milliamp Modules with P/N 535-601 have been supplied to customers by ATC Nuclear since 2010. However, there is not sufficient evidence to establish that all Milliamp Modules supplied to customers have defective Littelfuse surface-mount fuses installed. ATC Nuclear identified Milliamp Modules supplied in the January 2013 - June 18, 2015 timeframe as potentially having defective Littelfuse surface-mount fuses. Nuclear plants that received Milliamp Modules which potentially have a defective surface-mount fuse were as follows: LaSalle, Fermi 2, Limerick, and Clinton. ATC Nuclear has developed a Technical Bulletin to direct the purchasers and/or affected licensees for inspections to determined if the manufacturing defect could be present in their applications. Notified R1DO (Bickett), R3DO (Stone), and via E-mail Part 21 Group. |
| Where | |
|---|---|
| Moore Industries Oak Ridge, Tennessee (NRC Region 1) | |
| Organization: | Atc-Nuclear |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+1449.83 h60.41 days <br />8.63 weeks <br />1.986 months <br />) | |
| Opened: | Ray Chalifoux 13:50 Aug 10, 2015 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Oct 9, 2015 |
| 51303 - NRC Website
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Moore Industries with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 513032015-06-11T04:00:00011 June 2015 04:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 Interim Report - Potential Defect on P/N 535-601 Moore Industries Milliamp Modules 2015-06-11T04:00:00 | |