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| Entered date | Event description | |
|---|---|---|
| ENS 49324 | 5 September 2013 17:31:00 | Current design basis calculations indicate the Low Pressure Safety Injection (LPSI) pumps could potentially operate in a run-out condition under certain worst case design basis conditions. The LPSI pumps could operate in a run-out condition beyond the analyzed time by 20 minutes. Current design basis calculation assumes LPSI Pump would be shutdown by (the) RAS (Recirculation Actuation Signal) in less than one hour, however due to past changes to Containment Spray Pump Start Logic, the time was lengthened to 80 minutes which is beyond the one hour analyzed. This represents a reportable unanalyzed condition. The licensee notified the NRC Resident Inspector.
Fort Calhoun completed additional analysis which verified that the LPSI pumps will not go into run-out as previously reported. Therefore Fort Calhoun is withdrawing the event notification. The licensee will notify the NRC Resident Inspector. Notified R4DO (Drake). |
| ENS 47696 | 24 February 2012 04:24:00 | Communications has been lost to 21 sirens out of 101. The loss of communications does not allow the activation of the sirens. Almost all of Harrison County and Pottawattamie County in Iowa are without communications to the sirens. There are compensatory measures in place to ensure notification by local law enforcement in case of an actual emergency to inform the public in these areas. This is being reported per 10CFR50.72(b)(3)(xiii) for 'Any event that results in a major loss of emergency assessment capability, off site response capability, or communications capability'. An attempt is being made to reboot the siren's communication system in order to restore the sirens. During the reboot, sirens in Washington County, Nebraska, will also lose communications and therefore will not be functional. Local Law Enforcement has been notified in Washington County to perform compensatory measures in case of an emergency. The NRC Resident Inspector has been informed.
As of 0518 CST, communications has been reestablished and all sirens were returned to service. The licensee notified the NRC Resident inspector. Notified R4DO (Deese).
Following an investigation of the siren failure, it was determined that all sirens were lost for a period of time from approximately 1809 CST February 23, 2012 until 0518 CST February 24, 2012. The control room was notified at 0215 CST February 24, 2012 and compensatory measures were established for all affected counties in Iowa and Nebraska. No new compensatory measures or actions are or were required. The licensee has notified the NRC Resident Inspector. Notified R4DO (Haire). |
| ENS 47088 | 22 July 2011 13:23:00 | Both Fire Suppression Pumps are not operable because the required monthly surveillance tests will not be completed for June and July. The surveillance tests will be completed when flood waters recede to below 1004 feet MSL. The current river level is 1006.3 feet. Both fire pumps, FP-1A and FP-1B, are available and lined up for use. Other options are also available to provide a means of backup fire water supply that include: - Water Plant Pumps DW-8A and DW-8B aligned to the Fire Protection (FP) system. - Temporary connection to the fire protection water distribution system by the Fort Calhoun Fire Truck that is staged on site or any other fire pumper truck via fire hydrant FP-3G. - Admin Building/Training Center fire hydrant via fire hoses or water truck. This supply is from Blair water system and FP storage tank west of Highway 75. - Drafting from the Missouri River via temporary pumps. The licensee notified the NRC Resident Inspector.
Further review of the plant design and licensing basis determined that the plant is adequately analyzed for the reported situation and that it does not constitute an unanalyzed condition significantly degrading plant safety as originally reported. Therefore, this event is being retracted. The licensee has notified the NRC Resident Inspector. Notified R4DO (Proulx). |