Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 43207 | 2 March 2007 17:03:00 | A licensed employee had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been revoked. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.
The licensee provided a retraction regarding the above positive alcohol fitness-for-duty test. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector. R4DO (Shannon) notified. |
| ENS 43837 | 11 December 2007 17:53:00 | On Tuesday, December 11, 2007, at approximately 1105 PST, the San Onofre Nuclear Generating Station Control Room Red Phone and commercial telephone systems became inoperable for approximately 10 minutes. Control Room Red Phone operability was confirmed by a successful call to NRC Headquarters Operation Office about 1115 PST. Southern California Edison is reporting this event in accordance with 10CFR50.72(b)(3)(xiii) for a condition that resulted in a major loss of offsite communications capability (Emergency Notification System and offsite notification system). As part of the problem solving efforts, the Red Phone may become inoperable for brief periods of time. At the time of this report, Unit 2 is in Mode 6 in a refueling outage and Unit 3 is in Mode 1 at 100 percent power. The NRC Senior Resident Inspector has been notified of this event and provided a copy of this report. The licensee still had satellite phone communications capability. |
| ENS 43928 | 23 January 2008 21:34:00 | On January 23, 2008, at about 1415 PST, SONGS Unit 2 was operating at approximately 95 percent power when one of two main feed water pumps (P063/K005), tripped on low oil pressure while an adjustment was being made to the pump's lubricating oil pressure regulator. Control room operators manually actuated the emergency feedwater system in accordance with Abnormal Operating Instructions. Control room operators reduced reactor power level to about 65 percent which can be sustained with one normal feedwater pump in operation. The cause of this event is currently under investigation. In compliance with 10CFR50.72(b)(3)(iv)(A), requiring licensees to report any event or condition that results in valid actuation of the emergency feedwater system, SCE is providing this notification to the NRC. At the time of this occurrence, Unit 3 was operating at about 100 percent power. SCE has notified the NRC resident inspectors about this occurrence and will provide them with a copy of this report. |
| ENS 43933 | 25 January 2008 14:43:00 | On January 25, 2008, at about 0902 PST, SCE notified the City of Dana Point Emergency and Support Services of a spurious actuation of a SONGS (San Onofre Nuclear Generating Station) emergency response siren located in the City of Dana Point. The actuation occurred on January 25, 2008 at about 0900 PST with a duration of approximately ten seconds. The cause of the actuation appears to be due to SCE (Southern California Edison) maintenance being performed at the time. SCE personnel notified Orange County and the State of California Office of Emergency Services regarding the inadvertent actuation of part of the public notification system. In compliance with 10CFR50.72(b)(2)(xi), requiring licensees to report any event that results in notification to other government agencies, SCE is providing this notification to the NRC. "At the time of this occurrence, Unit 2 was operating at about 96 percent power and Unit 3 was operating at about 100 percent power. SCE has notified the NRC resident inspectors about this occurrence and will provide them with a copy of this report. |
| ENS 44092 | 25 March 2008 15:26:00 | On March 25, 2008 at approximately 0640 PDT, SCE discovered a battery with voltage slightly below Technical Specification limits. At approximately 0840 PDT, plant operators began cooling Moisture Separator Reheaters (MSR) in preparation for a Shutdown as required by TS 3.8.4. Initiating MSR cooldown reduced reactor power by 0.1%. Although plant operators had not initiated boration or control rod insertion, SCE is, nevertheless, reporting this occurrence in accordance with 10CFR50.72(b)(2)(i). At approximately 0850 PDT, the battery was restored to Operable status and MSR cooldown was suspended. At approximately 1112 PDT, the Unit was returned to full power. SCE is continuing to assess if additional actions are required. At the time the shutdown was initiated, Unit 2 was operating at about 100% power. Unit 3 continues to operate at about 100% power. The NRC Resident Inspectors have been briefed on the shutdown plans and will be provided with a copy of this report. Preliminary information indicates that the degraded voltage was due to loose terminal bolts. |
| ENS 44227 | 20 May 2008 18:44:00 | On Tuesday, May 20, 2008, at approximately 1310 PDT, the offsite power grid connected to San Onofre experienced a momentary system disturbance. Control Room indicators alerted Operators that the grid frequency dipped to approximately 59.69 Hz. Because frequency dipped below 59.7 Hz, SCE is reporting this event in accordance with 10CFR50.72(b)(3)(v)(D). The frequency dip lasted approximately 10 seconds, reportedly due to a high voltage DC transmission line disturbance in Oregon. The grid is currently operating at nominal frequency. At the time of the event, San Onofre Unit 2 was operating in Mode 1 at approximately 99 percent power and Unit 3 was operating in Mode 1 at approximately 80 percent power. The NRC Senior Resident Inspector has been notified of this event and provided a copy of this report. |
| ENS 44355 | 18 July 2008 19:36:00 | Southern California Edison (SCE) has scheduled maintenance for the electrical system of the San Onofre Emergency Operations Facility (EOF), for Saturday, July 19, 2008. While the maintenance is being performed, the EOF will be inoperable. The EOF outage is expected to begin at 0800 PDT and last approximately 4 hours. The alternate EOF, located in Irvine, CA, will be available should SCE need to respond to an Emergency Event. The Emergency Recall System, which is housed in the EOF, will be out of service while the maintenance is performed. Should recall of the Emergency Response Organization (ERO) be necessary during the EOF outage, SCE will utilize alternate methods (contained in existing site procedures) for activating the ERO. This planned EOF outage is being reported in accordance with 10CFR50.72(b)(3)(xiii). At the time of this report, Unit 2 and Unit 3 were operating at about 98 per cent and 100 per cent, respectively. The NRC Resident Inspector has been notified of this report and will be provided a copy.
The Emergency Operations Facility was returned to service on July 19, 2008 at 1240 PDT. The NRC Resident Inspector will be notified of this occurrence and will be provided with a copy of this report. Notified R4DO (Johnson). |
| ENS 44456 | 1 September 2008 17:03:00 | On September 1, 2008, at about 1035 PDT, Southern California Edison (SCE) began a planned shutdown of San Onofre Unit 3. This shutdown is in anticipation of exceeding the Allowed Outage Time (AOT) of 14 days of Technical Specification 3.8.1 Action B.4 for an inoperable Diesel Generator (Train B). The AOT is due to expire on September 2, 2008 at about 0200. If the system cannot be restored within the allowed outage time, a plant shutdown is required. The initiation of this shutdown is being reported in accordance with 10CFR50.72(b)(2)(i). An inspection of the DG generator revealed cracks in the shorting ring, requiring replacement of the generator. Post maintenance testing performed after replacement revealed anomalous readings. SCE determined that problem identification, repair and post test could not be performed before expiration of the AOT. Consequently, shutdown has been initiated. At the initiation of the shutdown, SONGS Unit 3 was operating at full power. SONGS Unit 2 is operating at approximately 99 percent power. The NRC Resident Inspectors have been briefed on the shutdown plans and will be provided with a copy of this report. |
| ENS 44897 | 11 March 2009 19:49:00 | A non-supervisory contract employee was found using illegal drugs in the Protected Area. A for-cause fitness for duty test resulted in a confirmed positive drug test. The contract employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. |
| ENS 45138 | 17 June 2009 17:10:00 | A non-licensed employee supervisor had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been revoked. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector. |