ENS 44689
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ENS Event | |
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07:58 Nov 30, 2008 | |
Title | Accident Mitigation - Crefs Inoperable |
Event Description | On 30 November 08 at 0158, the Control Room Emergency Filtration System (CREFS) was declared inoperable due to a degraded Control Room Envelope (CRE). A CRE boundary door was found to be stuck partially open. With this door not fully closed and latched, reasonable assurance that CREFS would fulfill its safety function could not be established.
The CRE door is a support features for CREFS at CNS. This is a single train system and per 10CFR50.72(b)(3)(v)(D) an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report is required due to the fact that at the time of discovery this condition could have prevented the fulfillment of the safety function of an SSC [Structure, System & Components] that is required to mitigate the consequences of an accident. The door was returned to a fully closed and latched position at the time of discovery, and CREFS was returned to operable status. Administrative controls are in place to ensure the door closes and latches until repairs can be performed. The licensee notified the NRC Resident Inspector. |
Where | |
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Cooper Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+0.4 h0.0167 days <br />0.00238 weeks <br />5.4792e-4 months <br />) | |
Opened: | Roy Giles 08:22 Nov 30, 2008 |
NRC Officer: | John Knoke |
Last Updated: | Nov 30, 2008 |
44689 - 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 %) |
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