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| Entered date | Event description | |
|---|---|---|
| ENS 45377 | 22 September 2009 15:11:00 | 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 45038 | 3 May 2009 14:32:00 | At approximately 0745 (CDT) it was determined that the ANO telephone system communications for outgoing and incoming calls had been lost. An ENS phone check was performed satisfactory with the NRC. Two alternate dedicated outside lines located in the Control Rooms and five alternate NRC lines in the TSC were operating satisfactory. However, when E-plan personnel evaluated the EOF located in the nearby training center, there was only one outside line that was functioning and in addition to a lack of external phone lines, there was no internal phone communications available between the EOF and the plant. The impairment to the EOF due to the lack of communications was considered a major loss of emergency assessment capability per 50.72(b)(3)(xiii). Phone service to the site was returned at 1031 (CDT). Phone service to the EOF was verified at 1145 (CDT). This event was the result of an offsite power outage on 05/02/09. Following the loss of power, the onsite telephone equipment transferred automatically to battery supplied backup power. When the affected offsite power was restored, the telephone equipment power supply failed to automatically realign (auto transfer). No alarms were available to operators to detect the power supply misalignment. The licensee notified the NRC Resident Inspector. |
| ENS 41056 | 19 September 2004 12:03:00 | At 0934 CDT on 9/19/2004, the Unit 1 and Unit 2 Control Rooms began receiving phone calls reporting an actuation of emergency sirens in the Russellville area. A phone call was made to the Arkansas Department of Health, who controls actuation of the sirens, and the reported that they had indications of the sirens alarming. They suspect that power fluctuations in the area led to the inadvertent alarms. This report is being made in accordance with ANO Reporting Guidelines "News Release or Government Agency Notification" and 10CFR50.72(b)(2)(xi) since there was a notification of state/county agencies of inadvertent actuation of part of the public notifications. The licensee notified the NRC Resident Inspector. |