ENS 40845
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ENS Event | |
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06:21 Jun 28, 2004 | |
Title | Unusual Event Declared Due to Earthquake Registered on Site Seismic Monitors |
Event Description | At 0111, received a Strong Motion Seismic Alarm and received calls from numerous personnel onsite and offsite that they felt ground motion. A GSEP Unusual Event was declared at 01:21 due to a confirmed seismic event Emergency Action Level HU-4. A walk down of various plant areas including the Dike is in progress to determine if any equipment was affected or damaged. During the event, some spurious alarms were received which cleared with exception of the seismic alarm. The seismic alarm will be reset after Station Engineering reviews the seismic data. They observed a 1" water level spike that immediately returned to normal on main control room suppression pool water level recorder and plant process computer. At this time we have received no reports of equipment damage and walk downs are continuing. The earthquake measured 4.5 on the Richter Scale and was approximately 10 miles north of Ottawa, IL. Ottawa is located 10 miles NW of the site. Both Units remained on line and stable.
The NRC Resident Inspector will be notified and the state was notified. NOTE: See related events 40844 and 40846.
This is an update to Event Number 40845. At 0355 CDT the Unusual Event, entered due to confirmed seismic event, was terminated. A walk down of various plant areas has been completed. No equipment damage was identified. The NARS [Nuclear Accident Reporting System] notification for termination was completed at 0405. The licensee notified the NRC Resident Inspector, the State and local authorities. Notified by e-mail: Susan Frant (IRO), Thomas Kozak (R3 DO), Frank Gillespie (NRR EO), Pat Hiland (Reg3), and Geoffrey Grant (R3). Also notified FEMA (Erwin Casto) and DHS (Andy Akers). |
Where | |
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Lasalle Illinois (NRC Region 3) | |
Reporting | |
Emergency class: | Unusual Event |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
Time - Person (Reporting Time:+-3.12 h-0.13 days <br />-0.0186 weeks <br />-0.00427 months <br />) | |
Opened: | Daniel Coveyou 03:14 Jun 28, 2004 |
NRC Officer: | Chauncey Gould |
Last Updated: | Jun 28, 2004 |
40845 - NRC Website
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Unit 1 | |
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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 %) |
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