ENS 40712
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ENS Event | |
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17:09 Apr 28, 2004 | |
Title | Control Room Hvac Inoperable |
Event Description | During routine alignment of the Control Room HVAC system it was determined the 2/3-5741-053B damper failed to close as required. The damper is required to close to isolate outside air to the control room for accident conditions.
Because of the damper failure the Control Room Emergency Ventilation System (CREVS) was declared inoperable at 1209 on 4/28/04. The CREVS is a single train system utilized to mitigate the consequences of an accident and this event is reportable under 10 CFR 50.72(b)(3)(v)(D). (Exelon Reportability Manual Section - SAF 1.8) The licensee notified the NRC Resident Inspector. |
Where | |
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Dresden Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+1.68 h0.07 days <br />0.01 weeks <br />0.0023 months <br />) | |
Opened: | Mark Hanneman 18:50 Apr 28, 2004 |
NRC Officer: | Mike Ripley |
Last Updated: | Apr 28, 2004 |
40712 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (52 %) |
After | Power Operation (52 %) |
Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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