ENS 46694: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 03/24/2011 10:18 CDT | | event date = 03/24/2011 10:18 CDT | ||
| last update date = 03/24/2011 | | last update date = 03/24/2011 | ||
| title = Unexpected Loss | | title = Unexpected Loss of Annuciators During Planned Maintenance | ||
| event text = During a planned maintenance activity on the Unit 2 main control room alarm cabinets, it was identified that all Unit 2 safety system annunciators were lost. This was identified at 1006 [CDT]. Main Control Board indicators remained functional. At 1018 [CDT], the Shift Manager declared an Unusual Event under Emergency Action Level MU6. This was due to an unplanned loss of most (approximately 75%) safety system annunciators for > 15 minutes. The planned maintenance activity was not expected to affect the amount of annunciators that were lost. | | event text = During a planned maintenance activity on the Unit 2 main control room alarm cabinets, it was identified that all Unit 2 safety system annunciators were lost. This was identified at 1006 [CDT]. Main Control Board indicators remained functional. At 1018 [CDT], the Shift Manager declared an Unusual Event under Emergency Action Level MU6. This was due to an unplanned loss of most (approximately 75%) safety system annunciators for > 15 minutes. The planned maintenance activity was not expected to affect the amount of annunciators that were lost. | ||
At 1030 [CST], the [planned maintenance] clearance order was cleared and power was restored to the Unit 2 annunciators. | At 1030 [CST], the [planned maintenance] clearance order was cleared and power was restored to the Unit 2 annunciators. | ||
Latest revision as of 22:07, 1 March 2018
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.65 h-0.152 days <br />-0.0217 weeks <br />-0.005 months <br />) | |
| Opened: | Scott Butler 11:39 Mar 24, 2011 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Mar 24, 2011 |
| 46694 - NRC Website | |