ENS 46352
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ENS Event | |
|---|---|
10:36 Oct 22, 2010 | |
| Title | Manual Reactor Trip During Physics Testing Due To Problems With The Rod Control In Hold Out Switch |
| Event Description | On 10/22/2010 at 0636 hours0.00736 days <br />0.177 hours <br />0.00105 weeks <br />2.41998e-4 months <br />, North Anna Unit-1 reactor was manually tripped during physics testing and 1-E-0 was entered due to problems with the Rod Control In Hold Out Switch. The out direction of the switch was not functioning properly and the reactor was tripped to put the plant in a condition to perform maintenance. All control rods fully inserted into the reactor core. This was an uncomplicated reactor trip with no automatic ESF actuation required.
Unit 1 is currently stable at normal operating temperature and pressure in MODE 3 (Hot Standby). The plant electrical line-up is normal. Decay heat removal is via the steam dumps. Notification will be made to the local county administrator's office. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
North Anna  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-0.83 h-0.0346 days <br />-0.00494 weeks <br />-0.00114 months <br />) | |
| Opened: | Don Taylor 09:46 Oct 22, 2010 |
| NRC Officer: | Eric Simpson |
| Last Updated: | Oct 22, 2010 |
| 46352 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Startup (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 571482024-05-29T10:24:00029 May 2024 10:24:00
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