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| Entered date | Event description | |
|---|---|---|
| ENS 50225 | 24 June 2014 15:06:00 | Planned preventive maintenance will render parts of telephone system and Emergency Response Data System (ERDS) nonfunctional. As a result, this represents a loss of emergency communications capability and is reportable under 10 CFR 50.72(b)(3)(xiii). The maintenance is scheduled to begin on 6/25/2014 at 00:00 (CDT), and is expected to last approximately 5 hours. During this maintenance window, various communication connections will be intermittently interrupted for short periods of time. Affected communication connections include some local telephone company lines, Federal Telephone System, ERDS, the Monticello's NRC office, and automatic ring down lines to the state of Minnesota's Emergency Operations Center. During the planned maintenance window, communications to offsite will be available via radios, cell phones, and satellite communications. This ensures that the plant can adequately communicate with the NRC, state, and local agencies to ensure protection of the health and safety of the general public. The NRC Resident Inspector has been notified of the planned telecommunications maintenance. Licensee also notified the Minnesota State Duty Officer and the Wright and Sherburne County Sheriff dispatchers.
At 0500 (CDT) on 6/25/2014, planned maintenance on the Monticello telecommunications system was completed. At 1630 (CDT) on 6/25/2014, testing of all telecommunications was completed. All systems are functioning properly. The NRC Resident Inspector has been notified that the telecommunications system is functional. The Minnesota State Duty Officer and the Wright and Sherburne County Sheriff dispatchers have been notified that the telecommunications system is functional. Notified R3DO (Lara). |
| ENS 50136 | 23 May 2014 16:57:00 | At 1130 CDT, an Area Radiation Monitor (ARM) was determined to be non-functional as a result of a failed calibration test. This represents a loss of assessment capability reportable under 10CFR50.72(b)(3)(xiii). A portable radiation monitor has been placed in the affected area as a compensatory measure. The health and safety of the public was protected as the plant was in a normal condition with no initiating event in progress or signs of elevated radiation levels on any other radiation monitors. The NRC Resident Inspector has been notified. The failed ARM is located in the 'A' RHR core spray room. |
| ENS 50052 | 23 April 2014 12:51:00 | Monticello Nuclear Generating Plant personnel discovered the remains of a deceased migratory bird on plant property. The cause of death was not immediately apparent and no work was ongoing in the vicinity at the time the bird was found. Notifications to the United States Fish and Wildlife Service will be made for this discovery. This event is being reported per 10CFR50.72(b)(2)(xi). The licensee has informed the NRC Resident Inspector. |
| ENS 49808 | 7 February 2014 17:52:00 | After cycling AO-2382A (Drywell to Torus Vacuum Breaker) for surveillance testing, it did not indicate fully closed. The procedure for this condition was entered and after cycling the valve several times, the vacuum breaker indicated full closed. During the approximately eight minutes that the indication showed that it was not closed, the Technical Specification Limiting Condition for Operation (LCO) requirement was not met. After validation that the vacuum breaker had opened as required, and was closed successfully, the safety function was restored. The health and safety of the public was not jeopardized as the plant was in a normal condition and an initiating event was not in progress. The USAR (Updated Safety Analysis Report) assumes all eight vacuum breakers to be closed. This condition therefore put the nuclear power plant in an unanalyzed condition and is reportable per 10CFR50.72(b)(3)(ii)(B). This condition, at time of discovery, could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident and is reportable per 10CFR50.72(b)(3)(v)(D). The licensee notified the NRC Resident Inspector, the State of Minnesota Duty Officer, and the local counties. |