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| Entered date | Event description | |
|---|---|---|
| ENS 46901 | 28 May 2011 17:46:00 | During normal operations, Dresden Station identified issues with site commercial phone lines. Normal commercial phone lines are functioning for outgoing calls and will be used for any required notifications. Incoming calls, however, cannot get through to Dresden. A test of the ENS phone system failed. In addition, the HPN phone line is also affected by this issue. A cell phone number has been provided to the NRC until this issue is corrected. Repair personnel have been contacted and are expediting repairs. This condition is reportable under 10 CFR 50.72(b)(3)(xiii) Major Loss of Emergency Preparedness Capabilities. The licensee has notified the NRC Resident Inspector. |
| ENS 46857 | 17 May 2011 18:40:00 | On 5/17/2011, at 1404 CDT, Dresden Operations was notified by a Mechanical Maintenance Supervisor that both intake bay 13 stop logs were mistakenly installed during routine bay cleaning on 5/17/2011 at 1030. Installation of both bay 13 stop logs removes the suction source for the Containment Cooling Service Water (CCSW) system and renders the CCSW systems inoperable for both Dresden Units 2 and 3. Appropriate Technical Specification Required Actions were entered which direct restoration of at least one train of CCSW within 8 hours on each unit. Mechanical Maintenance was directed to remove the stop logs from Bay 13. At 1410 stop logs were removed and CCSW was declared operable for both Unit 2 and Unit 3. This event is reportable under 10 CFR 50.72 (b) (3) (v) an "Event or Condition That Could Have Prevented Fulfillment of a Safety Function. The licensee notified the NRC Resident Inspector. |
| ENS 46532 | 10 January 2011 21:47:00 | Alcohol was found in the possession of a contractor inside the protected area. The individuals access to the plant has been terminated. Contact the Headquarters Operations Officer for additional information. |
| ENS 44626 | 3 November 2008 14:43:00 | On 11/3/08 at 0652 Shutdown Cooling (SDC) was lost on Dresden Unit 3 when the Recirc Loop Temperature Element (3-0260-13B) failed upscale. Unit 3 was in the process of initial cooldown for entry into a refueling outage. Actual Recirc loop temperature was about 217 degrees F based on alternate indications. The temperature element (3-0260-13B) remained upscale for several minutes before returning to its previous value. The failed element was jumpered out and SDC was restarted. This event is reportable under 10CFR 50.72(b)(3)(v)(B). The licensee notified NRC Resident Inspector. RETRACTION ON 11/18/2008 AT 1214 FROM RANDY WROBLEWSKI TO MARK ABRAMOVITZ * * * On November 8, 2008 shutdown cooling was lost on Dresden Unit 3 when the Reactor Recirculation System Loop Temperature Element (3-0260-13B) failed upscale. Plant operators immediately recognized the condition, and implemented an existing operations procedure to re-establish shutdown cooling flow and ensure that the Shutdown Cooling System continued to fulfill the safety function of residual heat removal. The Shutdown Cooling System is a manually initiated, non-safety related system that is not credited for mitigation of any event or accident in Dresden's safety analyses. The implementation of an existing procedure to restore shutdown cooling system flow in a short period of time (i.e., less than 10 minutes in this case), by the Main Control Room operators trained on the procedure, provides reasonable assurance that the system continued to fulfill its safety function. Therefore, Exelon Generation Company, LLC has determined that this event is not reportable under 10CFR 50.72(b)(3)(v)(B) and is retracting ENS Report 44626. The licensee notified the NRC Resident Inspector. Notified the R3DO (O'Brien). |