ENS 46590
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ENS Event | |
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22:23 Jan 27, 2011 | |
Title | Unsealed Penetrations Discovered in the Intake Structure |
Event Description | During a walkdown of the Intake Structure conducted on January 27, 2011, to identify any penetrations in the exterior envelope of the building, four unsealed conduit penetrations [each penetration was four inches in diameter] were identified. These penetrations are concealed within a junction box on the northwest corner of the building. The penetrations are at an elevation of approximately 1006 ft. - 1007 ft. mean sea level (MSL). Flooding through the penetrations could have impacted the ability of all the station raw water pumps to perform their design accident mitigation functions.
This eight-hour notification is being made pursuant to 10CFR50.72(b)(3)(v). This report should have been made on January 27, 2011, and is late. Subsequent review of the issue determined this reportability. The river level has been less than 990 ft MSL since January 27, 2011. There have not been any indications of conditions that might result in a flood. The penetrations have been temporarily plugged. A permanent modification is in progress. The penetrations were plugged on February 2, 2011. The licensee notified the NRC Resident Inspector. |
Where | |
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Fort Calhoun 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:+163.28 h6.803 days <br />0.972 weeks <br />0.224 months <br />) | |
Opened: | Erick Matzke 17:40 Feb 3, 2011 |
NRC Officer: | Donald Norwood |
Last Updated: | Feb 3, 2011 |
46590 - 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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