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| Entered date | Event description | |
|---|---|---|
| ENS 42555 | 4 May 2006 21:54:00 | On May 4, 2006, at 1750 hrs, with the plant in Mode 5, an actuation of the reactor protection system occurred with a single control rod fully withdrawn for testing. The actuation occurred when operators opened the main steam isolation valves (MSIVs) for a separate testing activity, which caused an apparent pressure perturbation with the steam generator level transmitters. The pressure perturbation resulted in the indicated level of 2 of 4 'A' Steam Generator level transmitters oscillating to below the steam generator low level reactor trip setpoint, before returning to the pre-event level. As a result of the reactor protection system actuation, the control rod inserted into the core as expected. The steam generators were aligned in lay-up condition with a nitrogen blanket present at the time the MSIVs were opened. The event is reportable in accordance with 10 CFR 50.72(b)(3)(iv), as a valid actuation of the reactor protection system. The licensee informed the NRC Resident Inspector. |
| ENS 42514 | 19 April 2006 18:49:00 | At 0225 hrs on April 19, 2006, a container storing in-core instrument pieces rose to the surface of the flooded reactor cavity under its own bouyancy, causing unexpected high radiation readings in the general vicinity of the reactor cavity for a few seconds before the container returned to the bottom of the reactor cavity. Emergency Action Level RU2.2 was promptly reviewed, and it was determined that the threshold for an unusual event was not exceeded, because the area radiation monitors rose by a factor of approximately 100 versus the EAL setpoint of 1000 over normal levels. Subsequently, at 1750 hrs, during post event investigation, it was discovered that dose rates indicated by an electronic dosimeter worn by an individual in the area at the time of the event may have exceeded the EAL setpoint of 1000 times the normal radiation levels for that area of containment for a few seconds. The total exposure received by the individual was less than 50 millirem. Therefore, this event is being reported in accordance with NUREG 1022, Revision 2, Section 3, "Discussion." as a potential event discovered after-the fact. The licensee notified the NRC Resident Inspector, and Al Svilpe, Emergency Management Office in Van Buren County, MI. There is also expected to be some media attention from this incident. |
| ENS 42248 | 10 January 2006 17:27:00 | A non-licensed employee supervisor tested positive for a controlled substance (illegal drug) during a random fitness-for-duty test. The employee's access to the plant has been terminated. A work performance review is in progress. The licensee notified the NRC Resident Inspector. Contact the Headquarters Operations Officer for additional details. |
| ENS 41788 | 23 June 2005 10:40:00 | A non-licensed employee supervisor tested positive for illegal drugs during a random test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer. The licensee notified the NRC Resident Inspector. |
| ENS 41002 | 31 August 2004 09:38:00 | At 0718 EDT, the reactor was manually tripped from approximately 95% power following notification to the control room of a fire associated with condensate pump 2B. Initially, upon notification of smoke at the condensate pump, a rapid down power had been commenced, wherein reactor power was reduced from 100% to approximately 95% power. An automatic actuation of the auxiliary feedwater system also occurred as designed to maintain steam generator water level following the reactor trip. The fire was extinguished in less than 10 minutes. The local fire department was notified, responded to the site as a precautionary measure, but was not used in extinguishing the fire. All systems functioned as designed. The reactor is stable in mode 3. Decay heat is being removed with the steam generators discharging steam to the main condenser. The licensee notified the NRC Resident Inspector. |
| ENS 40333 | 18 November 2003 14:11:00 | A notification was made to the Pollution Emergency Alert System (PEAS) and Department of Environmental Quality (DEQ) due to an oil spill. This occurred during activities associated with replacing a transformer that is located in the owner controlled area, when oil within the transformer spilled to the ground. The quantity of oil was approximately n75 gallons. The spill was contained to the soil and never reached the surface water. Cleanup is in progress. The NRC Resident Inspector was notified. |