ENS Event | |
|---|---|
05:46 Jun 13, 2008 | |
| Title | Unusual Event Due to Partial Loss of Annunciators |
| Event Description | The licensee is investigating a loss of greater than 75% of their annunciator indications. The annunciators lost include alarms for ECCS divisions 1 & 2, Reactor Control Panels, and electrical panels. "All normal methods of monitoring plant systems are available." Compensatory measures are being initiated. The plant is stable at 100% power and all maintenance has been stopped.
The licensee notified the NRC Resident Inspector.
Troubleshooting revealed the "C" MUX to be the cause of the problem. "C" MUX was removed from service and the redundant unit is now supplying input. Based on satisfactory testing the Shift Manager terminated the Unusual Event. The licensee informed the NRC Resident Inspector. Notified R3DO (Louden), IRD (McDermott, Gott), DHS (J. Craig), FEMA (J. Dunker), DOE (R. Foot), USDA (R Leadbetter), HHS (Y. Mammarelli), Canada (L. Colligan). |
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.53 h-0.147 days <br />-0.021 weeks <br />-0.00484 months <br />) | |
| Opened: | William Richards 02:14 Jun 13, 2008 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jun 13, 2008 |
| 44293 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 499372014-03-20T18:05:00020 March 2014 18:05:00
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