ENS 54927

v t e ENS Event
13:45 Oct 2, 2020
Title	Secondary Containment Inoperable
Event Description	At 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> [EDT] on 10/02/2020, with Millstone Unit 3 in Mode 4, Operations discovered a door in the Secondary Containment boundary blocked open. Investigation determined the door was blocked open at 1842 [EDT] on 10/01/2020, rendering Secondary Containment inoperable. The door was closed at 1002 [(EDT) on 10/02/2020], restoring Secondary Containment to operable status. Since Secondary Containment was rendered inoperable, Dominion Energy is reporting this as a condition that could have prevented the fulfillment of the safety function to control the release of radioactive material and mitigate the consequences of an accident. This condition is being reported as an eight hour report pursuant to 10 CFR 50.72 (b)(3)(v)(C) and (D). There was no release of radioactivity to the public. The NRC Senior Resident Inspector has been notified. With the door blocked open, the plant was in a 24-hour shutdown action statement. The state of Connecticut and local towns were notified.

ENS 54927 +/-
Where
Millstone Connecticut (NRC Region 1)
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:+-1.17 h-0.0488 days <br />-0.00696 weeks <br />-0.0016 months <br />)
Opened:	Michael J. Watson 12:35 Oct 2, 2020
NRC Officer:	Howie Crouch
Last Updated:	Oct 2, 2020
54927 - NRC Website
v • d • e

v t e Emergency Notification System
Millstone with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR		Secondary Containment Inoperable 2020-10-02T13:45:00 [Table view]
[ENS list for Millstone]

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