ENS 53685
ENS Event | |
|---|---|
04:00 Oct 22, 2018 | |
| Title | En Revision Imported Date 11/12/2018 |
| Event Description | EN Revision Text: CONTROL ROOM ENVELOPE DECLARED INOPERABLE DUE TO DOOR LATCH FAILURE
At 0856 EDT on October 22, 2018, it was discovered that the Control Room Envelope, a single-train system, was inoperable due to failure of a boundary door to latch; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D) as a loss of safety function. The door latch was repaired, and the Control Room Envelope declared operable at 0910 EDT. There was no impact on the health and safety of the public or plant personnel, as the door was capable of being closed at all times and the door was manned the entire time it could not latch. The NRC Resident Inspector has been notified.
Retraction of Event #53685, Control Room Envelope Declared Inoperable due to Door Latch Failure Based on subsequent field measurements taken for the boundary door, the force needed to open the unlatched door is sufficient to maintain the Control Room Envelope positive pressure. Therefore, the Control Room Envelope remained Operable with the boundary door unlatched, and this issue did not prevent the system from fulfilling its safety function to mitigate the consequences of an accident. The NRC Resident Inspector has been notified. Notified the R3DO (Hanna). |
| Where | |
|---|---|
Davis Besse  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+10.7 h0.446 days <br />0.0637 weeks <br />0.0147 months <br />) | |
| Opened: | Nick Downing 14:42 Oct 22, 2018 |
| NRC Officer: | Andrew Waugh |
| Last Updated: | Nov 9, 2018 |
| 53685 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |