ENS 46964
ENS Event | |
|---|---|
18:00 Jun 15, 2011 | |
| Title | Rosemount Model 710 Trip Units Would Not Turn on During Testing |
| Event Description | On June 15, 2011, the Site Vice President was notified that the 10 CFR 21 evaluation of Rosemount Model 710 trip units supplied under purchase order 10174727 determined that the reporting criteria of 10 CFR 21.21 (d)(1) are met.
During pre-installation testing, it was found that 3 of 4 Rosemount Model 710 trip units would not turn on. The units were returned to Rosemount for failure analysis and it was determined that a resistor in the start-up circuit for the trip unit was failed. This prevented the trip unit from starting. Based on engineering analysis, some of the applications for the trip unit require it to energize to perform the associated safety functions. Therefore, the identified failure mechanism could have represented a substantial safety hazard if the components had been installed, and the condition is reportable. The condition had no actual safety consequences as the deficiency was identified during pre-installation testing and if installed without pre-installation testing, the system could not have passed post maintenance testing. The three failed units were returned to Rosemount. This notification is made pursuant to 10 CFR 21(d)(ii)(3)(i). The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| FitzPatrick New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+18.23 h0.76 days <br />0.109 weeks <br />0.025 months <br />) | |
| Opened: | Eugene Dorman 12:14 Jun 16, 2011 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jun 16, 2011 |
| 46964 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 469642011-06-15T18:00:00015 June 2011 18:00:00
[Table view]10 CFR 21.21 Rosemount Model 710 Trip Units Would Not Turn on During Testing ENS 411422004-10-08T22:31:0008 October 2004 22:31:00 10 CFR 21.21 Part 21 Report: Auxiliary Relays Failure 2011-06-15T18:00:00 | |