ENS 46292
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ENS Event | |
|---|---|
10:50 Sep 30, 2010 | |
| Title | Offsite Notification - Inadvertent Alarm Actuation |
| Event Description | At 0650 [EDT] on September 30, 2010, site personnel were notified by multiple Calvert County residents of a single siren activation (Siren C21) at 0645 [EDT] for approximately 2-3 minutes.
Following a detailed review of the site's Alert and Notification System, the site identified multiple activations of the siren in addition to the first inadvertent activation of the siren that occurred at 0645 [EDT]. The multiple siren activations were not related to any condition or event at Calvert Cliffs. The siren has experienced multiple losses of power as a result of the effects from heavy rain and wind associated with the passing of Tropical Storm Nicole. Each time the power had restored to the siren, it performed a full cycle test as opposed to the standard silent test. County Officials were notified and are taking actions to communicate to Calvert County residents concerning the inadvertent siren actuation. Site maintenance locally deactivated the siren at 0827 [EDT] and will further investigate the extent of issue with the siren once the Tropical Storm Nicole has passed. In response to deactivating the siren, Calvert County has implemented the back-up method of route alerting in the event that actual siren activation is required. The NRC Resident Inspector has been informed of the activations. |
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-1.18 h-0.0492 days <br />-0.00702 weeks <br />-0.00162 months <br />) | |
| Opened: | Kent Mills 09:39 Sep 30, 2010 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Sep 30, 2010 |
| 46292 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 539212019-03-09T17:00:0009 March 2019 17:00:00
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