ENS Event | |
|---|---|
05:00 Jun 14, 2012 | |
| Title | Part 21 - Reliability Degradation of Resistors in Trip Units and Readout Assemblies |
| Event Description | Certain 710DU Trip Units may not perform their intended safety function as a result of certain wire wound precision resistors experiencing a degradation of reliability. Additionally, certain 710DU Readout Assemblies used to calibrate 710DU Trip Units may experience degraded digital display accuracy during calibration due to a similar cause. Rosemount Nuclear Instruments, Inc. does not have complete information relating to specific plant applications and therefore cannot determine the potential effects of the condition on plant operation.
This notification affects certain Model 710DU Trip Units and certain 710DU Readout Assemblies shipped from Rosemount Nuclear Instruments, Inc between March 16, 2005 and May 10, 2012. The shipments were distributed to Ginna, Nine Mile Point, Fermi, Columbia Generating Station, Fitzpatrick, River Bend Station, Grand Gulf, Quad Cities, Peach Bottom, LaSalle, Limerick, Dresden, Perry, Hope Creek, Hatch, Brunswick, Browns Ferry, and Monticello. |
| Where | |
|---|---|
| Rosemount Nuclear Instruments, Inc. Chanhassen, Minnesota (NRC Region 3) | |
| Organization: | Rosemount Nuclear Instruments, Inc. |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+178.05 h7.419 days <br />1.06 weeks <br />0.244 months <br />) | |
| Opened: | Jeff Chivers 15:03 Jun 21, 2012 |
| NRC Officer: | Dong Park |
| Last Updated: | Jun 21, 2012 |
| 48042 - NRC Website
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Rosemount Nuclear Instruments, Inc. with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 580602025-11-25T06:00:00025 November 2025 06:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Rosemount Pressure Transmitters Electronic Assembly Faiulres ENS 480422012-06-14T05:00:00014 June 2012 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Reliability Degradation of Resistors in Trip Units and Readout Assemblies 2025-11-25T06:00:00 | |