ENS 45377

v t e ENS Event
18:29 Sep 22, 2009
Title	Unanalyzed Condition Resulting from an Unlatched Door Serving as a High Energy Line Break Barrier
Event Description	Based on the results of a past operability evaluation completed on 1329 [CDT], 9/22/2009, it appears that an unanalyzed condition existed intermittently for short periods of time in which a door that serves as a High Energy Line Break (HELB) barrier may have been unlatched. With the door not latched, an engineering evaluation concluded that a critical crack (HELB) in the Main Feedwater pipe traversing the south penetration room would force the door (DR-19) open, creating a harsh environment in the adjoining Emergency Feedwater (EFW) pump room. Because the EFW pump room is not evaluated for harsh conditions, it must be conservatively assumed that both pumps may fail to operate following this HELB event. Therefore, this condition is being reported in accordance with 10CFR50.72(b)(3)(ii)(B) as an unanalyzed condition that significantly degrades plant safety. The licensee informed the Arkansas Department of Health. The licensee will be notifying the NRC Resident Inspector.

ENS 45377 +/-
Where
Arkansas Nuclear Arkansas (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+-3.3 h-0.138 days <br />-0.0196 weeks <br />-0.00452 months <br />)
Opened:	Crystal Garbe 15:11 Sep 22, 2009
NRC Officer:	Dong Park
Last Updated:	Sep 22, 2009
45377 - NRC Website
v • d • e

v t e Emergency Notification System
Arkansas Nuclear with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2016-09-15T14:08:00 [Table view]
[ENS list for Arkansas Nuclear]

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