ENS 51178

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v t e ENS Event
15:45 Jun 16, 2015
Title	Unanalyzed Condition Due to Open High Energy Line Break Doors
Event Description	On June 16, 2015 at 1145 EDT while in Mode 1 at 100% power steady-state conditions, two fire doors between the Reactor Auxiliary building (RAB) and steam tunnel were opened under administrative controls to support maintenance. These doors are credited in high energy line break equipment qualification and internal flooding analyses and opening of the doors is not addressed in the analyses. A high energy line break in the steam tunnel with the doors open could result in equipment in the RAB experiencing high temperature, pressure, or humidity beyond conditions analyzed for equipment qualification which has the potential to render redundant safety-related equipment inoperable. The event was determined to be reportable on June 24, 2015 at approximately 1550 [EDT]. During that reportability evaluation, it was determined that the doors may have been in a similar condition multiple times in the May-June time frame. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition and in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of the safety function of structures or system that are needed to mitigate the consequences of an accident. There was no adverse impact to public health and safety or to plant employees. The NRC Resident Inspector has been notified.

ENS 51178 +/-
Where
Harris North Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+195.73 h8.155 days <br />1.165 weeks <br />0.268 months <br />)
Opened:	Raymond Moore 19:29 Jun 24, 2015
NRC Officer:	Daniel Mills
Last Updated:	Jun 24, 2015
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v • d • e

v t e Emergency Notification System
Harris with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2022-10-28T00:50:00 [Table view]
[ENS list for Harris]

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