ENS 43793
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ENS Event | |
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11:05 Nov 20, 2007 | |
Title | |
Event Description | On November 20, 2007, at 0505 hours0.00584 days <br />0.14 hours <br />8.349868e-4 weeks <br />1.921525e-4 months <br />, the Control Room Emergency Ventilation (CREV) system was declared inoperable due to an inoperable Air Filtration Unit (AFU). During monthly testing it was discovered that the AFU heater failed to operate as required. Technical Specification 3.7.4, Condition A, was entered which requires the CREV system to be restored to an operable status in seven days. This notification is being made in accordance with I0CFR50.72(b)(3)(v)(D), Event or Condition That Could Have Prevented Fulfillment of a Safety Function, because the CREV system is a single train system required to mitigate the consequences of an accident.
Troubleshooting is in progress to determine the cause of the AFU heater failure to start. The licensee notified the NRC Resident Inspector and the Illinois Emergency Management Agency (IEMA). |
Where | |
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Quad Cities Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000254/LER-2007-003 |
Time - Person (Reporting Time:+0.4 h0.0167 days <br />0.00238 weeks <br />5.4792e-4 months <br />) | |
Opened: | John Vesely 11:29 Nov 20, 2007 |
NRC Officer: | Jeff Rotton |
Last Updated: | Nov 20, 2007 |
43793 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (97 %) |
After | Power Operation (97 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (96 %) |
After | Power Operation (96 %) |
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