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| Entered date | Event description | |
|---|---|---|
| ENS 49888 | 10 March 2014 19:20:00 | At 1628 EDT Nine Mile Point (NMP) Unit 2 experienced an actuation of the Alternate Rod Insertion (ARI) system which resulted in a reactor scram. Coincident with the scram, the Reactor Core Isolation Cooling (RCIC) system initiated. Prior to the event, maintenance personnel were working in the vicinity of a reactor vessel level instrumentation rack and may have agitated the common drain line of the transmitters. A prompt investigation is underway to investigate the incident. The actuation signal for the RCIC system was invalid because reactor vessel level did not reach level two and the actuation was not in response to actual plant conditions or parameters. The reactor scram is reportable in accordance with 10 CFR 50.72(b)(2)(iv)(B) as, 'Any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical.' The event has been entered into the NMP corrective action program as CR-2014-001963. The NRC Resident Inspector has been notified. The licensee has notified the State of New York. The reactor is shutdown with all rods inserted. Decay heat is being rejected to the condenser and reactor water level is being maintained by condensate, feedwater, reactor water clean up, and control rod drive systems. |
| ENS 49481 | 29 October 2013 11:45:00 | At 0556 EDT, (on 10/29/13), Nine Mile Point Unit 1 experienced an unplanned loss of ten area radiation monitors due to a loss of the associated power supply. These monitors are located throughout the station. Compensatory local monitoring was established in the affected areas until the area radiation monitors could be restored to service. The cause of the loss of the power supply was determined to be a blown fuse. The fuse was replaced and the power supply was restored at 1040 EDT. All area radiation monitors are restored. Post maintenance testing is in progress. The condition is reportable as a major loss of emergency assessment capability in accordance with 10CFR50.72(b)(3)(xiii). The NRC Resident Inspector has been notified. An update will be provided once the area radiation monitors have been restored to functional status. * * * UPDATE FROM RYAN C. HAMILTON TO PETER J. SNYDER AT 1545 EDT ON 10/29/13 * * * Post maintenance testing is complete and the affected area radiation monitors are declared functional as of 1440 (EDT) on 10/29/13." Notified R1DO (Krohn). |
| ENS 47743 | 14 March 2012 17:32:00 | On Monday, March 12, 2012, at 1435 EDT, Oswego County Warning Point notified Nine Mile Point, and NYS (New York State) Warning Point, via the land line, of a loss of the Tone Alert System for greater than one hour from the National Weather Service as of 1305 hrs. Site Emergency Procedures define a loss of Tone Alert System for greater than one hour, as a significant loss of Emergency Communications (EPIP-EPP-30). This impacts the ability to readily notify a portion of the Emergency Planning Zone (EPZ) population for the NMP (Nine Mile Point) and JAF (James A. Fitzpatrick) Nuclear Power Plants. This failure meets NRC 8-Hour reporting criteria 10 CFR 50.72(b)(3)(xiii). The County Alert Sirens, which also function as part of the Public Prompt Notification System, remained operable. The loss of the Tone Alert System constitutes a significant loss of Emergency Off-Site Communications capability. Compensatory measures were verified to be available should the Prompt Notification System be needed. This consists of utilizing the hyper-reach system, which is a reverse 911 feature available from the county 911 center. Local law enforcement personnel are also available for 'Route Alerting' of the affected areas of the EPZ. The licensee has notified the NRC Resident Inspector.
The tone alert system was restored Thursday, March 15, 2012 at 0933 EDT. The licensee notified the NRC Resident Inspector. Notified the R1DO (Krohn).
Correction to original notification: In the description above, the date of event was incorrectly identified as Monday, March 12, 2012, the date should have been Wednesday, March 14, 2012. Notified the R1DO (Krohn). |
| ENS 46347 | 19 October 2010 21:14:00 | This 8-hour non-emergency report is being made based upon requirements of 10 CFR 50.72(b)(3)(xiii) which states that the licensee shall notify the NRC as soon as practical and in all cases within eight hours of the occurrence of: 'Any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system).' At 1308 EDT on Tuesday, October 19, 2010, the Nine Mile Point Unit 1 Control Room received the annunciator for Process Computer Trouble. At the same time, all Process Computer displays stopped updating, including the Safety Parameter Display System (SPDS). All Control Room panel indicators and annunciators continue to respond properly providing operators with non-computer based emergency assessment capability. An additional Plant Operator has reported to shift in accordance with Technical Specification 6.2.2.a for minimum shift complement with the process computer out of service. An update to this notification will be made after repairs are completed and the SPDS is returned to service. The licensee informed the NRC Resident Inspector.
On Wednesday, October 20, 2010, repairs were completed and at 0439 EDT, the Plant Process Computer (PPC) was successfully restarted. Upon restart, SPDS was verified operable. The licensee informed the NRC Resident Inspector. Notified R1DO (Miller). |