ENS 50015: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 16: | Line 16: | ||
| event date = 04/09/2014 CDT | | event date = 04/09/2014 CDT | ||
| last update date = 05/09/2014 | | last update date = 05/09/2014 | ||
| title = Part 21 - Potential Defect | | title = Part 21 - Potential Defect in General Electric Type Cr120Ad Control Relays | ||
| event text = The following information was received via fax: | | event text = The following information was received via fax: | ||
This letter is being issued by QualTech NP, Huntsville, AL, to provide an initial notification to the Nuclear Regulatory Commission and Nebraska Public Power District [NPPD] Cooper Nuclear Station concerning a potential defect in General Electric Type CR120AD control relays. A failure analysis revealed that the most likely initiator of the failure was a flaw or defect in the start wrap of the magnet wire. The flaw created an arc that involved windings directly beneath the start wrap which resulted in an open circuit on the coil windings. This failure is classified as infant mortality, which is similar to the failure mode identified in the 10 CFR part 21 30 day report (accession number 9706190261) dated June 12, 1997 submitted by GPU Nuclear. | This letter is being issued by QualTech NP, Huntsville, AL, to provide an initial notification to the Nuclear Regulatory Commission and Nebraska Public Power District [NPPD] Cooper Nuclear Station concerning a potential defect in General Electric Type CR120AD control relays. A failure analysis revealed that the most likely initiator of the failure was a flaw or defect in the start wrap of the magnet wire. The flaw created an arc that involved windings directly beneath the start wrap which resulted in an open circuit on the coil windings. This failure is classified as infant mortality, which is similar to the failure mode identified in the 10 CFR part 21 30 day report (accession number 9706190261) dated June 12, 1997 submitted by GPU Nuclear. | ||
Latest revision as of 21:50, 1 March 2018
| Where | |
|---|---|
| Qualtech Np Huntsville, Alabama (NRC Region 1) | |
| Organization: | Qualtech Np |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+10.35 h0.431 days <br />0.0616 weeks <br />0.0142 months <br />) | |
| Opened: | Matthew Thelen 15:21 Apr 9, 2014 |
| NRC Officer: | Steve Sandin |
| Last Updated: | May 9, 2014 |
| 50015 - NRC Website | |