ENS Event | |
|---|---|
05:00 Jan 12, 2007 | |
| Title | Part 21 - Rosemount Pressure Transmitter May Not Be Seismically Qualified |
| Event Description | During routine operations on the RNII production floor, it was observed that an incorrect torque wrench was being used at mechanical assembly to tighten the Sensor Module Lock Nut. The incorrect tool was calibrated to a value of 12.5 ft-lb, resulting in undertorquing of the lock nut. The incorrect torque wrench was removed from service and replaced with a tool calibrated to the correct torque value of 35 ft-lb. RNII reworked all affected transmitters that had not yet shipped to the correct torque value.
Assembly with the incorrect tool could result in certain pressure transmitters having a degraded environmental seal between the sensor module and the electronics housing during or after a seismic event. The five affected models have been delivered to the Byron and Comanche Peak nuclear stations. |
| Where | |
|---|---|
| Rosemount Nuclear Chanhassen, Minnesota (NRC Region 3) | |
| Organization: | Rosemount Nuclear |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+1854.5 h77.271 days <br />11.039 weeks <br />2.54 months <br />) | |
| Opened: | David Roberts 10:30 Mar 30, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Mar 30, 2007 |
| 43266 - NRC Website | |
Rosemount Nuclear with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 477162012-02-16T06:00:00016 February 2012 06:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Report - Rosemont Pressure Transmitters Out of Tolerance Condition ENS 464492010-11-22T06:00:00022 November 2010 06:00:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Anolmaly Discovered on Rosemount Model 1152 Differential Pressure Transmitters with Output Code "L" 10-50 Ma Electronics ENS 432662007-01-12T05:00:00012 January 2007 05:00:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 - Rosemount Pressure Transmitter May Not Be Seismically Qualified 2012-02-16T06:00:00 | |