ENS 47516
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ENS Event | |
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12:56 Dec 10, 2011 | |
Title | Secondary Containment Inoperable Due to Icing of Reactor Building Intake Filters |
Event Description | Secondary containment pressure exceeded atmospheric pressure which does not meet the surveillance requirement to have secondary containment vacuum greater than or equal to 0.25 inches of water vacuum. Secondary containment was declared inoperable and the Limiting Condition for Operation (LCO) Action Statement was entered. Manual control of the reactor building pressure control system was taken. Vacuum was less than 0.25 inches of water for approximately 1 minute. Secondary containment is [now] operable.
There were no actual radiological releases associated with the event. Actual secondary containment integrity was not challenged. The secondary containment pressure excursion was a result of icing of the reactor building intake filters which caused the automatic reactor building pressure control system to function improperly. The licensee has notified the NRC Resident Inspector. |
Where | |
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Columbia Generating Station ![]() Washington (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+1.67 h0.0696 days <br />0.00994 weeks <br />0.00229 months <br />) | |
Opened: | Danny Stephens 14:36 Dec 10, 2011 |
NRC Officer: | John Knoke |
Last Updated: | Dec 10, 2011 |
47516 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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