ENS Event | |
|---|---|
23:17 Jan 25, 2007 | |
| Title | Technical Specification Shutdown Due to Dropped Control Element Assembly (Cea) |
| Event Description | Notification of shutdown required by the Technical Specifications per 10CFR50.72(b)(2)(i). Arkansas Nuclear One Unit 2 is shut down in Mode 3 (Hot Standby) due to Control Element Assembly misalignment as required by Technical Specification 3.1.3.1.d (All CEAs shall be OPERABLE with each CEA of a given group positioned within 7 inches, indicated position, of all other CEAs in its group). CEA #35 dropped to the bottom of the core due to power supply breaker trip during maintenance and was unable to be recovered within the allowed time. All rods were verified to trip normally as part of the controlled shutdown."
The reactor was manually tripped from approx. 20% power. The reactor trip was preplanned. The NRC Resident Inspector and the county were notified of this event by the licensee. Licensee will also notify the State of this event. |
| Where | |
|---|---|
Arkansas Nuclear  Arkansas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-3.1 h-0.129 days <br />-0.0185 weeks <br />-0.00425 months <br />) | |
| Opened: | James Crabill 20:11 Jan 25, 2007 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Jan 25, 2007 |
| 43121 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (45 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 522672016-09-28T12:45:00028 September 2016 12:45:00
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