ENS 52947
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ENS Event | |
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15:11 Sep 5, 2017 | |
Title | Primary Containment Declared Inoperable Due to Both Airlock Doors Open Simultaneously |
Event Description | On September 5, 2017 at 1111 EDT, with the reactor at 100 percent core thermal power and steady state conditions, plant personnel identified that both doors of the emergency personnel airlock of the equipment hatch were open simultaneously due to failure of the interlock. Personnel were at both the outside and inside doors, personnel heard air movement through the air lock. Immediate action was taken to close the inner containment personnel airlock door and it was verified closed. Both doors of the emergency personnel airlock of the equipment hatch were open for less than one minute. There was no radioactive release as a result of the event. The cause of the interlock failure is under investigation.
This condition requires an 8-hour non-emergency notification in accordance with 10 CFR 50.72(b)(3)(ii)(A), the condition of the nuclear power plant, including its principal safety barriers (primary containment), being seriously degraded. This condition is also reportable under 10 CFR 50.72(b)(3)(v)(C) as an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material. The NRC Resident Inspector has been notified. |
Where | |
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Three Mile Island Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
Time - Person (Reporting Time:+2.08 h0.0867 days <br />0.0124 weeks <br />0.00285 months <br />) | |
Opened: | Jeff Flowers 17:16 Sep 5, 2017 |
NRC Officer: | Donald Norwood |
Last Updated: | Sep 5, 2017 |
52947 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Three Mile Island with 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 529472017-09-05T15:11:0005 September 2017 15:11:00
[Table view]10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Primary Containment Declared Inoperable Due to Both Airlock Doors Open Simultaneously ENS 524152016-12-07T23:00:0007 December 2016 23:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Unisolable Reactor Coolant System Boundary Leakage ENS 495122013-11-07T11:00:0007 November 2013 11:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Reactor Coolant System Cold Leg Drain Line Ultrasonic Indication ENS 402962003-11-04T19:30:0004 November 2003 19:30:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressurizer Heater Bundle Diaphragm Plate Degraded Condition 2017-09-05T15:11:00 | |
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