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 Entered dateSiteRegionReactor typeEvent description
ENS 5417923 July 2019 19:50:00San OnofreNRC Region 4On 7/23/2019 at 1405 PDT, San Onofre Nuclear Generating Station (SONGS) made a required formal notification to the Regional Water Quality Control Board for the state of California concerning a monthly oil sample of the oil removal system. The sample was analyzed to contain 42 ppm oil. This number exceeds the daily instantaneous maximum of 20 ppm. An additional sample was taken approximately one minute later and was analyzed to contain 8.1 ppm oil, potentially indicating a problem with the initial sample. Additional investigation is underway and a written follow-up report will be submitted to the Regional Water Quality Control Board within 5 days in accordance with the National Pollutant Discharge Elimination System permit. The licensee will inform NRC Region IV staff.
ENS 536423 October 2018 19:39:00San OnofreNRC Region 4At 1135 PDT on October 3, 2018, Southern California Edison (SCE) determined a SCE supervisor failed a random breathalyzer test for alcohol during a random Fitness-for-Duty (FFD) test. The employee's unescorted access to San Onofre Nuclear Power Plant has been suspended."
ENS 535805 September 2018 12:53:00San OnofreNRC Region 4At approximately 0608 Pacific Daylight Time (PDT), the Control Room was notified of a SONGS SCE (San Onofre Nuclear Generating Station Southern California Edison) employee experiencing a non-work related medical emergency outside the protected area, inside the owner controlled area. SONGS fire brigade was dispatched. Camp Pendleton Fire ambulance was requested. At 0644 (PDT) Camp Pendleton Fire department in communication with a doctor determined the victim is deceased. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) for a situation related to the health of on-site personnel for which a notification to other government agencies is planned. California Highway Patrol and Coroner notified and expect the California Occupational Safety and Health Administration (Cal-OSHA) will be notified. NRC Region IV was notified (approximately 0900 PDT) as SONGS does not have a NRC resident inspector."
ENS 5225219 September 2016 18:17:00San OnofreNRC Region 4CEAt 1230 (PDT) on 9/19/16, SONGS (San Onofre Nuclear Generating Station) made an offsite notification to the San Diego Regional Water Quality Control Board in regards to an oily waste water release to the environment in excess of allowable limits. On 9/15/16, the Unit 3 oily waste sump overflowed. An estimated 1500 gallons was released to the intake which is pumped to the outfall. A sample was taken during the end of the overflow; no visual indication of oil and grease was noted. The sample analysis completed on 9/19/16 indicated a result that exceeded SONGS' NPDES (National Pollutant Discharge Elimination System) instantaneous maximum limit of 20 ppm; results were 34.4 ppm. The licensee will inform NRC Region IV staff.
ENS 5204727 June 2016 22:14:00San OnofreNRC Region 4Westinghouse PWR 3-Loop
CE

A non-licensed contract employee had a confirmed positive for alcohol following a for-cause fitness-for-duty test. The employee's access to the plant has been terminated. This information will be sent to the NRC Region 4 Office as San Onofre no longer has a resident.

  • * * RETRACTION ON 4/18/2018 AT 1308 EDT FROM TIM CUSICK TO STEVEN VITTO * * *

In the event report, the individual was described as a contract supervisor, thus meeting the reporting threshold. (the violation of the FFD policy was that he failed a for-cause test for alcohol). Recently, an NRC review of SONGS' 2016 Annual Fitness for Duty report found that SONGS described that test failure as 'not reportable' and that the labor category was 'Maintenance (Craft).' After reviewing the data, Access Authorization confirmed that the individual was a Union Maintenance Foreman (not a supervisor). The event was not reportable." SONGS will be notifying NRC Region 4. Notified R4DO (O'KEEFE) and FFD E-mail Group.

ENS 5155419 November 2015 19:10:00San OnofreNRC Region 4CEA review of operations log data revealed the Unit 2 Spent Fuel Pool temperature was allowed to drift approximately two degrees below the accepted analyzed temperature of 68 degrees F. The Extent of Condition is under review and the number of instances has not been fully determined. It is possible Unit 3 may have also been affected. As described in the San Onofre UFSAR, Section 9.1.2.3 'Design Basis for Fuel Storage and Handling,' one of the conditions assumed in meeting the design basis, is as follows: the most adverse delta-k (reactivity change) was analyzed for a pool temperature range from 68 degree F to 160 degree F. Although the temperature decrease is considered unlikely to have a significant impact on the results of the analysis, it is being reported under 10 CFR 50.72(b)(2) as an unanalyzed condition because there is at this time no analysis of record for the reduced temperature condition. There were and continue to be no observed, abnormal effects from the temperature drop below 68 degrees F, and no impact on the health or safety of plant personnel of the public. Re-analysis is in progress and is expected to demonstrate that the criticality acceptance criteria of 10CFR50.68 were met at all times. The licensee notified the Regional NRC Contact.
ENS 5101827 April 2015 18:56:00San OnofreNRC Region 4CENotification was made to the San Diego Regional Water Quality Control Board, and a message was left for exceeding the daily maximum parts per million (ppm) of oil and grease in the North Industrial Area Yard Drain Sump. Sump pumps are currently in "OFF" and the site is investigating. The oil in the drain sump did not reach "reportable quantities" and did not require notifying other Federal Agencies.
ENS 5047018 September 2014 18:43:00San OnofreNRC Region 4CEToday, at 1235 (PDT), San Onofre made the decision to notify offsite agencies (San Diego Regional Water Quality Control Board and Environmental Protection Agency if directed by SDRWQCB). Initial contact made with the San Diego Regional Water Quality Control Board was at 1333 (PDT) on 9/18/14. The subject of the report is listed below: On September 15, 2014, during a review of the NPDES (National Pollutant Discharge Elimination System) self-monitoring reports, SCE SONGS (Southern California Edison San Onofre Nuclear Generating Station) environmental staff discovered annual and semi-annual samples and required reports due in 2014 were not submitted on time and are now past due: - The missed samples and associated reports are non-radiological in nature - All parameters (physical and analytical data) in past Semi-annual and Annual reports have been in compliance with the NPDES permit. The licensee informed the NRC Resident Inspector.
ENS 5011514 May 2014 18:07:00San OnofreNRC Region 4CESONGS (is) making a 4-Hour notification per 10CFR72.75 (b) to the NRC Operations Center regarding the following: There has been a fire in the vicinity of the station. The fire is not on plant property and has not challenged station operations. Entry into SONGS' Emergency Plan and activation of the Emergency Response Organization is not required at this time. Because of the fire near the plant, Southern California Edison will be making a press release today to update the public as to the situation at the plant. The licensee notified an onsite NRC Inspector.
ENS 4997531 March 2014 14:44:00San OnofreNRC Region 4CE

On March 28, 2014 at 2110 PDT, station staff felt a minor seismic event, which was verified on the NEIC (National Earthquake Information Center). On-shift staff reviewed basis documentation and EAL (Emergency Action Levels) classification, and concluded the event was below the threshold to classify the event. During post event reviews (conducted on 3/31/2014), it has been determined that those events met the classification criteria for declaration of a Notification of Unusual Event for a seismic event as specified by the Emergency Plan. No emergency situation exists at this time.

Site personnel did perform the steps of the Earthquake abnormal operating procedure even though the entry requirements were not met.  There were no plant or equipment issues identified during the site walk downs.

The licensee has notified the NRC Resident Inspector, the State of California and other Local authorities.

ENS 4891311 April 2013 04:29:00San OnofreNRC Region 4CEAt 2253 PDT on 4/10/13, SONGS experienced degraded on-site radio communications during planned maintenance on radio systems. Radio communications were restored at 2315 PDT. The licensee will notify the NRC Resident Inspector.
ENS 4842821 October 2012 13:03:00San OnofreNRC Region 4CEThe control room was notified that an unknown quantity of H2 gas (classified as a minor coupling leak (identified with Snoop liquid leak detector)) is currently being released to the air from the Unit 2 Full Flow Hydrogen skid. The Environmental Protection Group reported the leak to the California Emergency Management Agency (Cal EMA) at 0809 PDT and the San Diego Department of Environmental Health at 0812 PDT lAW (plant) procedure S0123-XV-17.3, 'Spill Contingency Plan'. The Hydrogen Gas leak is currently still in progress. There is no gas collection areas. Maintenance is in the process of taking action to terminate the leak. The licensee notified the NRC Resident Inspector.
ENS 4834425 September 2012 22:50:00San OnofreNRC Region 4CEThe control room was notified by the Environmental Protection Group that 43 lbs of Freon was released (from an air conditioning unit) at the Administration Warehouse Supply/Shop, not in the Protected Area, and that it was reported to the California Emergency Management Agency at 17:19 PDT and San Diego County at 17:12 PDT, per lAW procedure SO123-XV-17.3, 'Spill Contingency Plan'. There is no longer a Freon release in progress. The licensee has notified the NRC Resident Inspector.
ENS 4823226 August 2012 16:00:00San OnofreNRC Region 4CE

A Notice of Unusual Event (NOUE) was declared at San Onofre due to an earthquake felt on site (EAL HU1.1). The US Geological Survey indicates that there was a 5.3 magnitude earthquake near Brawley California, about 125 miles southeast of the plant. There were no indication of any impact to site operations other than being felt by personnel. Equipment inspections and walkdowns are in progress. The licensee has notified state and local authorities. The NRC Resident Inspector will be notified. Notified other FEDS (FEMA, DHS, DHS NICC and Nuclear SSA via email).

  • * * UPDATE FROM BAYER TO HUFFMAN AT 1713 EDT ON 8/26/12 * * *

On August 26, 2012 at 1346 PDT, San Onofre exited the Unusual Event based on an earthquake felt on site. Shortly after exiting the UE, the licensee felt more shaking in the control room. The licensee confirmed with the US Geological Survey that there has been an aftershock. The aftershock was approximately the same magnitude (5.4) and location as the original earthquake (about 125 southeast of the site). The licensee declared another unusual event at 1403 PDT. The licensee will re-perform all equipment walkdowns and inspections. The NRC Resident Inspector has been notified and is reporting to the site. R4DO (Hay), NRR EO (Lubinski), and IRD (Gott) notified.

  • * * UPDATE AT 2352 EDT ON 8/26/2012 FROM ADAM BOW TO MARK ABRAMOVITZ * * *

Exited the NOUE HU1.1 - Earthquake at 2017 PDT on 8/26/12. The licensee will notify the NRC Resident Inspector. Notified the R4DO (Hay), NRR (Lubinski), IRD (Gott), DHS, FEMA, and DHS NICC.

ENS 4785620 April 2012 16:29:00San OnofreNRC Region 4CESan Onofre Unit 2 declared an Unusual Event at 1249 PDT today due to an electrical fire within a fire detection panel (2L319) in the Unit 2 turbine building. The fire was declared extinguished at 1314 PDT after the panel was de-energized. The location of the fire had no impact on plant operation, equipment, or personnel safety. No offsite assistance was necessary. The licensee exited the Unusual Event at 1341 PDT after the licensee confirmed that the fire was terminated and there was no ongoing risk to the plant. The licensee notified state and local authorities and the NRC Resident Inspector. The NRC Operations Center notified other Federal Agencies (DHS SWO, FEMA Ops, DHS NICC, and NuclearSSA via e-mail).
ENS 4774414 March 2012 18:20:00San OnofreNRC Region 4CE

On January 31, 2012, Unit 3 was shut down due to detection of a tube leak in one Steam Generator (SG). The shutdown was previously reported on Event Notification # 47628. Southern California Edison (SCE) has been performing in-situ pressure testing with non-radioactive water on tubes with significant wear indications. On March 14, 2012, at approximately 1120 PDT, Unit 3 Steam Generator (SG) E088 Tube R106 C78 did not meet the target performance criteria because leakage exceeded 0.5 gallons per minute at the maximum pressure achieved during the test (2,884 psig). This was the leaking tube that resulted in the Unit 3 shutdown. Subsequently, two additional tubes in Unit 3 SG E088 did not meet the target performance criteria as follows: at 1249 PDT, Tube R102 C78 exceeded 0.5 gallons per minute at 3,268 psig and at 1425 PDT, Tube R104 C78 exceeded 0.5 gallons per minute at 3,180 psig. These occurrences are reportable as an 8-hour notification to the NRC in accordance with 10 CFR 50.72(b)(3)(ii)(A). Testing and inspection of Unit 3 steam generator tubes is ongoing to determine the extent and cause of the observed wear. A follow-up notification will be made for additional in-situ pressure test failures. The extent and cause of the condition will be addressed in the follow-up licensee event report that will be submitted in accordance with 10 CFR 50.73(a)(2)(ii)(A). Defective tubes will be removed from service as required prior to Unit 3 plant startup. Unit 2 has been shut down since January 9, 2012 for a scheduled refueling outage. SCE previously performed in-situ pressure testing of the tube with the most wear in Unit 2. Results from this test demonstrated that the tube met the target performance criteria. The NRC Resident Inspector has been notified of this event.

  • * * UPDATE FROM LEE KELLY TO DONALD NORWOOD AT 2108 EDT ON 3/15/2012 * * *

In-situ pressure testing on Unit 3 steam generator tubes was started on March 14, 2012 and is ongoing. On March 15, 2012, four additional tubes in Unit 3 SG E088 did not meet the target performance criteria of three-times normal pressure conditions as follows: (1) At 1109 PDT, Tube R100 C80 failed at 4,739 psig; (2) at 1437 PDT, Tube R107 C77 failed at 5,160 psig; (3) at 1604 PDT, Tube R101 C81 failed at 4,889 psig; and (4) at 1734 PDT, Tube R98 C80 failed at 4,886 psig. Testing and inspection of Unit 3 steam generator tubes is ongoing to determine the extent and cause of the observed wear. Follow-up notifications will be made for any additional in-situ pressure test failures." The licensee notified the NRC Resident Inspector. Notified R4DO (Cain).

  • * * UPDATE FROM LEE KELLY TO JOHN SHOEMAKER AT 2115 EDT ON 3/16/12 * * *

In-situ pressure testing on Unit 3 steam generator tubes was started on March 14, 2012 and is ongoing. On March 16, 2012, one additional tube in Unit 3 SG E088 did not meet the target performance criteria of three-times normal pressure conditions as follows: at 1216 PDT, Tube R99 C81 failed at 5,026 psig. Testing and inspection of Unit 3 steam generator tubes is ongoing to determine the extent and cause of the observed wear. Follow-up notifications will be made for any additional in-situ pressure test failures. The licensee notified the NRC Resident Inspector. Notified R4DO (Cain).

ENS 4762831 January 2012 22:58:00San OnofreNRC Region 4CEAt 1505 PST, Unit 3 entered Abnormal Operation Instruction S023-13-14 'Reactor Coolant Leak' for a steam generator leak exceeding 5 gallons per day. At 1549 PST, the leak rate was determined to be 82 gallons per day. At 1610 PST, a leak rate greater than 75 gallons per day with an increasing rate of leakage exceeding 30 gallons per hour was established and entry into S023-13-28 'Rapid Power Reduction' was performed. At 1630 PST, commenced rapid power reduction per S023-13-28 'Rapid Power Reduction'. At 1731 PST, with reactor power at 35% the Unit was manually tripped. At 1738 PST, Unit 3 entered Emergency Operation Instruction S023-12-4 'Steam Generator Tube Rupture'. At 1800 PST the affected steam generator was isolated. All control rods fully inserted on the trip. Decay heat is being removed thru the main steam bypass valves into the main condenser. Main feedwater is maintaining steam generator level. No relief valves lifted during the manual trip. The plant is in normal shutdown electrical lineup. Unit 2 is presently in a refueling outage and was not affected by this event. The licensee has notified the NRC Resident Inspector. The licensee has issued a press release.
ENS 4755023 December 2011 15:18:00San OnofreNRC Region 4CEAt 0500 PST 12/23/2011, ERDS communication VPN (Virtual Private Network) link with the NRC was interrupted during an automatic swap between computer servers. Restoration of the communication link is expected to be restored by 1430 PST. The licensee will notify the NRC Resident Inspector.
ENS 4748128 November 2011 12:34:00San OnofreNRC Region 4CEDuring the regeneration of the Unit 2 full flow condensate polishing demineralizer (FFCPD) resin, 5 percent sulfuric acid briefly overflowed from the bermed area. The majority of the acid went into the floor drains in the FFCPD area and then to the turbine building sump system. An estimated quantity of 2 gallons of sulfuric acid was released into the storm drains that discharged into the circulating water system. The quantity released was well below the reportable quantity. The fire department and environmental/hazmat team were contacted and responded. Precautionary notifications were made by SCE to: - California Emergency Management Agency - San Diego Dept. of Environmental Health. The cause of the leak has been corrected and no additional discharge is anticipated. The licensee will notify the NRC Resident Inspector.
ENS 474011 November 2011 18:08:00San OnofreNRC Region 4CE

On November 1, 2011 at 1450 PDT, San Onofre Unit 3 declared an ALERT and entered EAL HA3.1 due to an ammonia leak that prevented access to local areas. The plant is in a stable condition while the leakage is being secured. The turbine building on Unit 3 has been evacuated. Plant personnel are in the process of verifying no presence of ammonia in the turbine building. There was no impact on Unit 2.

  • * * UPDATE FROM KEN HOUSEMAN TO JOHN KNOKE AT 2115 EDT ON 11/01/11 * * *

At 1807 PDT licensee exited the ALERT and EAL HA3.1. The leak was at the Ammonia day tank and was flowing through an overflow vent into the berm. The high level in the Ammonia day tank was due to a leaking closed valve between the Demineralizer system and the ammonia bulk storage. The berm area was drained of all fluids. The wind direction caused the ammonia fumes to travel to the Unit 3 turbine deck. No off-site HAZMAT personnel came on-site. At 1756 PDT the precautionary evacuation of on-site personnel was terminated. Unit 2 was not affected from this event. The NRC Resident Inspector was notified. Notified NRR EO (Fredrick Brown), R4DO (Vincent Gaddy, IRDMOC (Jeff Grant), DHS (Hill), DOE (Doyle), USDA (Krauf), FEMA (Fuller) and HHS (Fajardo).

  • * * UPDATE FROM LEE KELLY TO VINCE KLCO AT 2228 EDT ON 11/01/11 * * *

On November 1, 2011, Southern California Edison notified the California Emergency Management Agency at 1755 PDT and the San Diego Department of Environmental Health at 1810 PDT that approximately 25 gallons of Ammonium Hydroxide was spilled under the Ammonium Hydroxide day tank located outside the Unit 3 turbine building. The spill was contained in a berm under the tank and subsequently cleaned up. Both Units 2 and 3 were at approximately 100% power at the time of the event. Notified the R4DO (Gaddy).

ENS 4728923 September 2011 00:27:00San OnofreNRC Region 4CE

This notification is for San Onofre Units 2 and 3, and is being made in accordance with 10CFR50.72(b)(2)(xi) to report a notification to another government agency regarding a spill of approximately 26000 gallons of untreated waste water (sewage). A pending report will be made to the San Diego County Dept. of Environmental Health regarding a untreated (sewage) waste water spill that occurred as San Onofre. The details that were communicated to the DEH are that at 1730 PDT a sewage spill was identified at SONGS in the North Industrial yard area. The leak was being collected in the yard drains and being discharged to the ocean. The sump discharge system has been secured stopping the release. The licensee will inform the NRC Resident Inspector.

  • * * UPDATE FROM LEE KELLY TO JOHN KNOKE AT 1325 EDT ON 9/26/11 * * *

On September 22, 2011, an untreated (sewage) waste water spill was discovered in the San Onofre North Industrial Area. Southern California Edison (SCE) notified the NRC at 1730 PDT on September 22, 2011, (Event No. 47289) in accordance with 10CFR50.72(b)(2)(xi). The California Emergency Management Agency was notified (Control #11-5652) at 2223 PDT and San Diego County Department of Environmental Health (DEH) was notified at 2239 PDT. The initial report to the NRC indicated the spill was approximately 26,000 gallons. The estimated size of the spill has subsequently been revised to approximately 7,000 gallons. At the time of the event, Units 2 and 3 were at 100 percent power. SCE notified the NRC Resident Inspectors about this occurrence and will provide them with a copy of this report. Notified the R4DO (Greg Werner).

ENS 472528 September 2011 19:08:00San OnofreNRC Region 4CEOn September 8, 2011 at 1538 PDT, the San Onofre Units 2 and 3 reactors tripped due to a grid disturbance. All control rods fully inserted. The EFAS (Emergency Feed Actuation System) initiated as expected for a reactor trip. Steam generators are being fed by the main feedwater system and decay heat is being removed through the steam bypass system to the main condensers. There is no primary to secondary leakage and no safety relief valves lifted. Site electrical power sources are being fed from off-site power and both units are in a normal shutdown configuration. The emergency diesel-generators are in standby/operable status and were not required during the event. Both units are stable (NOT/NOP) and in Mode 3. The reactor trip response is considered uncomplicated. The licensee has notified the NRC Resident Inspector.
ENS 4706416 July 2011 09:12:00San OnofreNRC Region 4CE

The licensee declared an Unusual Event at 0612 PDT due to entry into EAL HU4.1 for a security-related event. Contact the Headquarters Operations Officer for details. The licensee notified State and local authorities and the NRC Resident Inspector.

  • * * UPDATE FROM DANIEL CRUZ TO DONALD NORWOOD AT 1255 EDT ON 7/16/11 * * *

The licensee exited the Unusual Event at 0950 PDT after verifying that the exit criteria for EAL HU4.1 had been met. Contact the Headquarters Operations Officer for details. The licensee notified State and local authorities and the NRC Resident Inspector. Notified NRR EO (Giitter), R4DO (Cain), IRD MOC (Morris), ILTAB (Allston), DHS SWO (Gates), and FEMA (Via).

  • * * RETRACTION FROM LEE KELLY TO DONALD NORWOOD AT 1356 EDT ON 8/3/11 * * *

After further investigation, the licensee determined that the declaration of the Unusual Event had been a conservative action not required by site procedures. Contact the Headquarters Operations Officer for details. The licensee notified the NRC Resident Inspector. Notified R4DO (Hagar), NRR EO (Thorp), and IRD MOC (Gott).

ENS 4690429 May 2011 15:01:00San OnofreNRC Region 4CEThis notification is for San Onofre Units 2 and 3 and is being made in accordance with 10CFR50.72(b)(2)(xi) to report that on 5/29/2011 at 0957 PDT Government agencies were notified of a sulfuric acid spill. On 5/28/2011 (at) 1440 PDT, during resin bed regeneration operations at the High Flow Makeup Demineralizer (HFMUD), a sulfuric acid transfer was in progress. When process piping was pressurized, a valve on the discharge side of the process pump experienced a diaphragm failure causing a body to bonnet leak. Operators secured the acid transfer. All the sulfuric acid was contained within the bermed area of the HFMUD. Hazardous material teams have contained and cleaned up the spill. Area is secured until repairs can be implemented. All HFMUD operations have been stopped until repairs are completed. On 5/29/2011 at 0926, the hazardous material team determined that this event was reportable to government agencies. The following reports were made: (At) 0957 PDT San Diego Department of Enviornmental Health (was) called with (a) voice message left. (At) 0959 PDT California Emergency Management Agency (was) called. Report number 11-3246. (At) 1008 PDT National Response Center (was) called. Report number 977718. The licensee has notified the NRC Resident Inspector,
ENS 4688224 May 2011 19:31:00San OnofreNRC Region 4CEA maintenance supervisor had a confirmed positive for alcohol during a for cause fitness-for-duty test. The employee's access has been revoked. Contact the Headquarters Operations Officer for additional details. The licensee has notified the NRC Resident Inspector.
ENS 4675514 April 2011 16:52:00San OnofreNRC Region 4CEDuring a scheduled delivery of Hydrogen to Unit 2's active and reserve hydrogen banks, a hydrogen leak was detected at the hydrogen fill connection isolation valve. A notification was made for an uncontrolled release of hazardous material to San Diego Department of Environmental Health at 12:35 PST and California Emergency Management Agency at 12:40 PST. Upon detection, the leak was isolated. The licensee has notified the NRC Resident Inspector.
ENS 4671130 March 2011 16:24:00San OnofreNRC Region 4CECity of San Clemente inadvertently secured power to 19 Community Alert Sirens. Trouble alarms were received at 0700 (PDT) but it is not known at what time specifically power was removed. All sirens were functional the day before when an inspection was performed on 3/29/2011 at 1213 (PDT). Power was restored to the sirens at 1145 (PDT) 3/30/2011. This event resulted in 20 community sirens being non-functional for greater than 1 hour. Siren State Parks 4 (SP-4) was also non-functional for unrelated reasons and remains out of service. Power was restored and all but the state park siren capabilities were declared operable. The licensee notified the NRC Resident Inspector.
ENS 4662117 February 2011 19:07:00San OnofreNRC Region 4CEOn February 17, 2011, at approximately 1200 PST, noted approximately 70 gallons of diluted 35% hydrazine had spilled fully contained in a bermed area from a chemical holding tank inside the Protected Area and subsequently removed to barrels. Off-site notifications were made as follows: National Response Center at 1536 (PST) (NRC REPORT #967808) Cal-EMA at 1530 (PST) San Diego Department of Health at 1526 (PST) The licensee has notified the NRC Resident Inspector.
ENS 4661615 February 2011 17:40:00San OnofreNRC Region 4CEOn February 15, 2011, at about 0830 PST, approximately 65 gallons (calculated maximum of 98 gallons) of partially treated sewage spilled on the ground and into a concrete ditch at San Onofre Nuclear Generating Station (SONGS) at the Mesa area while cleaning up from the plant overflow on 2-11-11. The spill was contained, vacuumed up, and returned to the sewage treatment plant. At approximately 1140 PST, Southern California Edison notified the San Diego Regional Water Quality Control Board, and the San Diego County Department of Environmental Health was notified at 1220 PST. Unit 2 is operating at approximately 100% power and Unit 3 is in Mode 3 after a steam generator replacement and refueling outage. The licensee will notify the Resident Inspector.
ENS 4661211 February 2011 22:40:00San OnofreNRC Region 4CEThe site Environmental Protection (EP) group notified the control room of a 3000 gallon sewage spill from the Mesa Sewage Treatment Plant. The spill overflowed to the storm water catch basin. The EP group notified the San Diego Regional Water Quality Board and the San Diego Department of Environmental Health. All sewage has been contained within the storm water catch basin. EP is currently on station to remediate the sewage spill. No sewage has been discharged offsite. The licensee has notified the NRC Resident Inspector.
ENS 4655018 January 2011 16:37:00San OnofreNRC Region 4CE

On January 18, 2011, at about 0830 PST, a State Park Ranger notified SONGS (San Onofre Nuclear Generating Station) Security that a siren growl was heard in the San Clemente State Park. Security subsequently notified the Control Room. Site Emergency Planning initiated an investigation of the event and informed the City of San Clemente Emergency Planning at approximately 0945 PST of the park ranger's call. SONGS investigation by its siren technicians into the potential SONGS siren growl resulted in absolutely no indication of activation of any of SONGS emergency sirens. It should be noted that quarterly growl tests have been scheduled during working hours January 18-20, 2011, and this information is posted on the City of San Clemente web site. However the tests had not been initiated at the time of the ranger report. In compliance with 10CFR50.72(b)(2)(xi), requiring licensees to report any event that results in notification to other government agencies, SCE (Southern California Edison) is providing this notification to the NRC. At the time of the State Park Ranger notification, Unit 2 was at approximately 100 percent power and Unit 3 was shutdown for a Steam Generator Replacement Outage. SCE will notify the NRC Resident Inspectors about this occurrence and will provide them with a copy of this report.

  • * * UPDATE FROM DENNIS MORRIS TO JOE O'HARA AT 1954 ON 1/18/11 * * *

SONGS telecommunications confirmed that the siren which was reported earlier was associated with Camp Pendleton and not associated with SONGS. Notified R4DO(O'Keefe)

ENS 4650321 December 2010 23:52:00San OnofreNRC Region 4CENotified by the Security Shift Commander at 1932 (PST) that access to the primary EOF is not possible due to flooding. San Onofre will activate the alternate EOF if an event is declared. There are no other affected systems or loss to emergency response capabilities due to this flooding. Access to the site has not been impacted due to the flooding. The NRC Resident Inspector has been notified. See similar report #46499.
ENS 4649921 December 2010 01:40:00San OnofreNRC Region 4CENotified by the Security Shift Commander at 2020 (PST) that access to the primary EOF is not possible due to flooding. San Onofre will activate the alternate EOF if an event is declared. There are no other affected systems or loss to emergency response capabilities due to this flooding. Access to the site has not been impacted due to the flooding. The NRC Resident Inspector has been notified.
ENS 463954 November 2010 22:22:00San OnofreNRC Region 4CE

On November 4, 2010, at approximately 1504 PDT, San Onofre Nuclear Generating Station (SONGS) was notified that scrap circuit breakers salvaged from the SONGS warehouse had alarmed a portal radiation monitor at a metal recycling facility in Los Angeles County. The monitor indicated a reading approximately 40% above background levels. Naturally occurring isotopes in the circuit breakers are suspected to have alarmed the portal monitor. The metal recycling vendor (Alpert and Alpert) called the Los Angeles branch of the California Department of Health Services, Radiologic Health Branch to obtain a special permit authorizing the return shipment to SCE. SCE is reporting this event in accordance with 10CFR50.72(b)(2)(xi). At the time of this report, Unit 2 was operating at 100% power and Unit 3 is defueled. The licensee notified the NRC Resident Inspector.

  • * * UPDATE AT 0018 EDT ON 11/06/10 FROM SIMMON TO HUFFMAN * *

On November 5, 2010, employees of the San Onofre staff disassembled the scrap circuit breakers that had been sent from the San Onofre Warehouse to the Alpert and Alpert salvage yard on November 4. These high voltage circuit breakers contain arc chutes consisting of large ceramic plates that contain naturally occurring radioactive material. All ceramic materials were removed. Health Physics technicians then re-surveyed the circuit breaker casings by direct and indirect survey and verified that they did not contain any detectable levels of radioactive material. Indirect survey of the ceramic material demonstrated that they had no detectable levels of removable radioactive material. The California Department of Health Services, Radiologic Health Branch will be notified of these results. The licensee has notified the NRC Resident Inspector. R4DO (Howell) and FSME (Chang) notified.

ENS 4634619 October 2010 20:09:00San OnofreNRC Region 4CE

On October 19, 2010, at about 1515 PDT, SONGS Unit 3 RPS channels 'B' and 'D' were tested for maintenance. During this testing, both channels were powered off, which brought in LPD/DNBR (local power density/departure from nucleate boiling) trips on both channels. There are no applicable Technical Specifications required for these RPS channels in Mode 5. Southern California Edison(SCE) is reporting this occurrence as a valid actuation of RPS in accordance with 10 CFR 50.72(b)(3)(iv)(a). SCE has taken actions to restore both channels 'B' and 'D' of RPS and cleared the RPS trip signal. At the time of this occurrence, Unit 2 was at approximately 100% power and Unit 3 was in a Steam Generator Replacement Outage, Mode 5, shutdown and cooldown with the RCS open, proceeding to Mode 6." The NRC Resident Inspector has been notified.

* * * RETRACTION FROM DENNIS MORRIS TO PETE SNYDER AT 0045 EDT ON 10/21/10 * * * 

On October 19, 2010, SCE reported (Event No. 46346) a valid actuation of the Reactor Protection System (RPS) in accordance with 10 CFR 50.72(b)(3)(iv)(A). Upon further review, SCE determined the actuation was invalid and is retracting the notification. Maintenance and surveillance testing was being conducted by Computer Technicians on the Core Protection Calculator (CPC) Channels 'A' and 'D', respectively, following station procedures. De-energizing the CPC channels was expected to bring in an RPS trip signal. The process to disable the control room RPS alarms had not as yet, been completed by the Instrument and Controls group when the CPCs were de-energized by procedure, actuating the RPS logic and causing the control room alarms. The actuation is considered invalid, as the equipment that would have been actuated by the trip safety function was previously de-energized and removed from service for the refueling outage. The Unit 3 reactor was in Mode 5, with the reactor trip breakers open, and control rods inserted. Unit 2 reactor remains at 100% power. The licensee notified the NRC Resident Inspector. Notified R4DO (V.Campbell).

ENS 4618217 August 2010 13:56:00San OnofreNRC Region 4CE

On August 16, 2010, at about 0100 PDT, SONGS Unit 2 Train 'A' Emergency Diesel Generator (EDG) 2G002 was removed from service for planned maintenance. Train 'A' EDG is the Appendix R protected Train. At about 1545 the same day, Southern California Edison (SCE) discovered a potential wiring discrepancy in the electronic governor. At 0300 on August 17, 2010, SCE determined two wires on a fire isolation fuse were confirmed to be terminated differently than specified in plant drawings and that the discrepancy would prevent the fuse and associated fire isolation switch from performing its Appendix R fire isolation function for the Train 'A' EDG. In accordance with NUREG-1022, Rev. 2, SCE is reporting this occurrence in accordance 10CFR50.72(b)(3)(ii)(B). While the incorrect wiring impacted the Appendix R qualifications of the Train 'A' EDG, it did not impact its other design functions and the EDG was capable to fulfill its safety function for all other Design Basis Events. Therefore, SCE considers the safety significance of the condition to be minimal. In accordance with LCS specification 3.7.113.1 Condition A, SCE will implement hourly Fire Watches for the impacted plant areas until such time that the wiring on the Unit 3 Train 'A' Emergency Diesel Generator 3G002 is conformed to be correct or has taken actions to correct any wiring discrepancy. An evaluation will be conducted to determine the cause of this condition. At the time of this occurrence, Unit 2 and Unit 3 were both at 100% power." The NRC Resident Inspector will be notified of this occurrence and will be provided with a copy of this report.

  • * * RETRACTION FROM KELMENSON TO KLCO ON 9/14/10 @ 1528 (EDT)* * *

The licensee is retracting the event based on the following: Upon further investigation, SCE determined the suspected wiring discrepancy was only an issue with an elementary diagram that was used for circuit verification. SCE had already flagged this elementary diagram as requiring revision and a change to the diagram was pending and had not been released to the field. The fire isolation fuse was wired correctly." Consequently, SCE is retracting the 8-Hour Telephone Notification made to the NRC on August 17, 2010 (Event Log No. 46182)." The NRC Resident Inspector will be notified of and will be provided with a copy of this retraction. Notified the R4DO (Clark)

ENS 4613328 July 2010 16:32:00San OnofreNRC Region 4CEOn Wednesday, July 28, 2010, at about 0945 PDT, Southern California Edison (SCE) determined that a spill of a total of about 110 gallons of sulfuric acid had occurred from two different locations earlier in the same day. All the acid was contained within the chemical berms around the acid transfer pumps in the Unit 3 intake area at the 9 foot level and the 30 foot level caustic berm. No acid was released to the environment. At 1050 PDT, SCE initiated notification to the San Diego County Department of Environmental Health (Report # 10-063463), the California Emergency Management Agency (CalEMA) (Report # 10-4518) and the National Response Center (Report # 949176). Notifications were completed by 1100 PDT. SCE is making this notification in accordance with 10CFR50.72(b)(2)(xi). The NRC Senior Resident Inspector has been notified.
ENS 4604725 June 2010 18:37:00San OnofreNRC Region 4CEOn Friday, June 25, 2010, at about 1235 PDT, Southern California Edison (SCE) spilled about 25 gallons of Ethanolamine (ETA) while filling the ETA bins from the ETA bulk container. The spill occurred at the SONGS MESA Hazmat pad. Approximately 23 gallons remained inside the hazmat berm; approximately 2 gallons were spilled and contained outside the berm. The SONGS Hazardous Materials personnel are in the process of removing the ETA for disposal. ETA is used to control secondary side chemistry. SCE completed notification of the San Diego County Department of Environmental Health, the California Emergency Management Agency (CalEMA) and the National Response Center (Incident # 945486) by 1427 PDT. SCE is making this notification in accordance with 10CFR50.72(b)(2)(xi). At the time of this report, SONGS Units 2 and 3 are at 100% power. The NRC Senior Resident Inspector has been notified of this occurrence and will be provided with a copy of this report.
ENS 4594321 May 2010 18:48:00San OnofreNRC Region 4CEOn May 19, 2010, at approximately 1730 PDT, San Onofre Nuclear Generating Station (SONGS) was notified that scrap bushings from breakers in the Unit 2 switchyard had alarmed a radiation monitor at a metal recycling facility in Los Angeles County. The metal recycling vendor (Alpert and Alpert) shipped the bushings back to a Southern California Edison (SCE) facility in Orange County. On May 21, 2010, SONGS completed isotopic analysis of a sample of ceramic shards from six randomly selected bushings. The analysis confirms the presence of naturally occurring radionuclides (uranium and thorium series), but does not indicate the presence of licensed radioactive material. On May 21, 2010, at approximately 1320 PDT, SONGS confirmed that on May 19, 2010, the metal recycling vendor had called the Brea branch of the California Department of Public Health, Radiologic Health Branch (Andrew Taylor) to obtain a special permit authorizing the return shipment to SCE. SONGS is, therefore, reporting this event in accordance with 10CFR50.72(b)(2)(xi) as an event related to the health and safety of the public for which notification to another government agency has been made. At the time of this report, both Unit 2 and Unit 3 were operating at 100 percent power. The NRC Senior Resident Inspector has been notified of this occurrence and will be provided with a copy of this report.
ENS 4586020 April 2010 18:39:00San OnofreNRC Region 4CEAt about 0755 (PDT) on April 20, 2010, approximately 200 gallons of sodium hydroxide (caustic) was released into the SONGS Caustic Skid Berm. The release was fully contained within the bermed area and there was no release to the environment. The release is believed to have occurred from a Unit 2 caustic pump pressure safety valve (PSV) during the performance of condensate polishing demineralizer regeneration. The release has been secured and SONGS personnel have pumped the caustic to poly drums. Between 1103 and 1125 (PDT) SONGS notified the San Diego Department of Environmental Health (DEH), the State of California Emergency Management Agency (CalEMA), and the National Response Center of the contained non-radioactive caustic spill within the protected area of the facility. Therefore, Southern California Edison is reporting this occurrence to the Nuclear Regulatory Commission in accordance with 10 CFR 50.72(b)(2)(xi). SONGS Unit 2 is in Mode 1 at approximately 98% power and Unit 3 is in Mode 1 at approximately 50% power. The NRC Resident Inspector will be notified of this occurrence and will be provided a copy of this report. Additional information regarding this event will be provided to one of the Resident Inspectors at the site.
ENS 458104 April 2010 19:07:00San OnofreNRC Region 4Westinghouse PWR 3-Loop
CE

Seismic Recording System activation with ground motion readily felt by control room personnel. Plant inspections performed to date show no observable damage to systems or structures." The seismic event was reported by U.S. Geological Survey as a magnitude 7.2 event occurring 26 km (16 miles) SW of Guadalupe Victoria, Baja California, Mexico. Initial ground motion analysis on site indicated 0.027 g acceleration in the transverse direction. The licensee has notified the NRC Resident Inspector.

  • * * UPDATE FROM ROBERT MEYERS TO DONG PARK AT 2055 EDT ON 4/4/2010 * * *

The Notification of Unusual Event classification was terminated at 1725 PDT on 4/4/2010 after completion of walk downs with no equipment issues being found. Notified R4DO (Okeefe), NRR EO (Bahadur), IRD (Gott), DHS (Vestal), and FEMA (Via).

ENS 457518 March 2010 16:31:00San OnofreNRC Region 4CEA non-licensed employee supervisor had a confirmed positive for alcohol during a follow-up fitness-for-duty test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details.
ENS 4571419 February 2010 18:12:00San OnofreNRC Region 4CE

Southern California Edison has planned work scheduled for the San Onofre Emergency Operations Facility (EOF), for Sunday, February 21, 2010. The work is being done in order to replace a faulty circuit breaker and will result in area lighting being out in the building from approximately 0800 through 1600. During the time that the lighting is out, the EOF will be considered non-functional. Should conditions occur that would merit activation, EOF responders would be directed to the alternate EOF located in Irvine, CA. This planned EOF outage is being reported in accordance with 10 CFR 50.72(b)(3)(xiii). The licensee has notified the NRC Resident Inspector.

  • * * UPDATE FROM TOM SIMMONS TO DONG PARK AT 2042 EST ON 2/21/2010 * * *

Follow up phone call to one made on 2/19/10 regarding planned power outage at normal EOF. Commenced 1145 (PST) today (2/21); restored 1715 (PST). The licensee will notify the NRC Resident Inspector. Notified R4DO (Miller)

ENS 456848 February 2010 05:33:00San OnofreNRC Region 4CEEmergency offsite siren, SC-11, in the City of San Clemente inadvertently activated for (approximately) 20 seconds. (Similar to 1/19/10 event) (EN #45636) Notification of California Office of Emergency Services and FEMA may occur. The licensee is investigating the cause of the alarm. The licensee has informed the NRC Resident Inspector.
ENS 4563619 January 2010 11:20:00San OnofreNRC Region 4CE

On January 19, 2010, at about 0445 PST, the SONGS Control Room was notified of a spurious actuation of a SONGS emergency response siren located in the city of San Clemente. The actuation occurred on January 19, 2010 at about 0430 PST for a duration of approximately 30 minutes. Upon investigation the siren was put into a silent test mode and technicians were able to duplicate the sounding. The siren was subsequently put into an inoperable status pending investigation and the cause of the actuation is unknown at this time. SCE (Southern California Edison) personnel notified Orange County, the City of San Clemente and the City of Dana Point 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 shutdown for a Steam Generator Replacement Outage and Unit 3 was operating at about 100 percent power. SCE will notify the NRC Resident Inspectors about this occurrence and will provide them with a copy of this report.

ENS 4563418 January 2010 23:43:00San OnofreNRC Region 4CE

On January 18, 2010, at about 1950 PST, the access road to the SONGS MESA facilities became flooded after a day of rain. The San Onofre Emergency Operations Facility (EOF) is located at the MESA and because of the flooding, is inaccessible to passenger vehicles. While the EOF itself is operable, in the event of an emergency at San Onofre, SCE (Southern California Edison) would direct EOF emergency responders to the alternate EOF located in Irvine, California. SCE is reporting this occurrence to the NRC in accordance with 10CFR50.72(b)(3)(xiii). At the time of this occurrence, Unit 2 was shutdown for a Steam Generator Replacement outage and Unit 3 was operating at about 100% power. SCE will notify the NRC Resident Inspectors about this occurrence and will provide them with a copy of this report.

  • * * UPDATE FROM GEOFF COOK TO DONG PARK @ 1208 EST ON 01/19/10 * * *

On January 18, 2010 at about 2101 PST, the MESA road flooding had dissipated sufficiently for car traffic to be passable. In the event of an emergency at San Onofre, there is no longer a need to redirect emergency responders to the alternate EOF located in Irvine, California. This report is to advise the NRC of this change in EOF access status. Also note that it is expected that rain will continue in the SONGS area during the week of January 17, 2010 and this status is subject to change. At the time of this occurrence, Unit 2 was shutdown for a Steam Generator Replacement Outage and Unit 3 was operating at about 100% power. SCE will notify the NRC Resident Inspectors about this occurrence and will provide them with a copy of this report. Notified R4DO (Werner) and NSIR (Kahler).

  • * * UPDATE FROM GEOFF COOK TO PETE SNYDER @ 1232 EST ON 01/21/10 * * *

On January 20, 2009, at about 2107 PST, the access road to the SONGS MESA facilities again became flooded after a day of rain (reference NRC Operations Log Number 45634). The San Onofre Emergency Operations Facility (EOF) is located at the MESA and because of the flooding, is inaccessible to passenger vehicles. While the EOF itself is operable, in the event of an Emergency at San Onofre, SCE would direct EOF emergency responders to the alternate EOF located in Irvine California. SCE is reporting this occurrence to the NRC in accordance with 10CFR50.72(b)(3)(xiii). At the time of this occurrence, Unit 2 was in a Steam Generator Replacement Outage and Unit 3 was operating at about 100% power. SCE will notify the NRC resident inspectors about this occurrence and will provide them with a copy of this report." Notified R4DO (Werner) and NSIR/EP.

ENS 4562813 January 2010 22:43:00San OnofreNRC Region 4CE

On January 13, 2010, at about 1125 PST, Train A suction piping from the SONGS Unit 3 Refueling Water Storage Tank (RWST) was determined to be inoperable following detection of weld flaw indications during ultrasonic testing. Due to miscommunication, operators mistakenly declared the Train B Emergency Core Cooling System (ECCS) header inoperable at about 1125 and removed DC control power to the Train B ECCS pumps. This resulted in both trains of Unit 3 ECCS being inoperable and entry into the Technical Specification (TS) 3.0.3 one-hour shut down action. At 1140 PST, the DC control power was restored to the Train B ECCS pumps, Train B ECCS was declared operable, and TS 3.0.3 was exited. SCE is reporting this in accordance with 10 CFR 50.72(b)(3)(v) as an event that could have prevented the fulfillment of a safety function. SCE is further evaluating the indications found on Train A piping to determine if the piping is capable of performing its safety function. At the time of this occurrence, Unit 2 was in a Steam Generator Replacement Outage, and Unit 3 was at approximately 100% power. The licensee notified the NRC Resident Inspector.

  • * * RETRACTION PROVIDED BY LEE KELLY TO DONG PARK AT 1402 EST ON 1/19/10 * * *

On January 13, 2010, SCE reported that both trains of Unit 3 Emergency Core Cooling System were inoperable for approximately 15 minutes because Train B ECCS was mistakenly taken out of service when weld flaw indications were found on Train A ECCS piping. This resulted in a condition that could have prevented the fulfillment of a safety function. Consequently, both trains of ECCS in Unit 3 were declared inoperable and the unit entered into Technical Specification 3.0.3 at 1134 PST (Time of Discovery). At 1140 PST, Train B ECCS was declared operable and TS 3.0.3 was exited. Event Notification 45628 was conservatively made because, although Train A ECCS piping remained capable of performing its safety function, this was not yet formally documented at the time the 8-hour report was due. Subsequently, an engineering evaluation was completed at 2308 PST on January 13, 2010, that demonstrates the as-found condition of the Train A ECCS piping was operable because the flaw meets the evaluation criteria of ASME Boiler and Pressure Vessel Code Case N-513-2. Since Train A ECCS piping was operable, this event did not constitute a condition that could have prevented the fulfillment of a safety function and is not reportable under 10 CFR 50.72(b)(3)(v)(D). Consequently, SCE is retracting the phone report to the NRC on January 13, 2010. The NRC Resident Inspector will be informed of this report. Notified R4DO (Werner).

ENS 456168 January 2010 18:15:00San OnofreNRC Region 4CEThis is a late eight hour report submitted under 10CFR50.72(b)(3)(v), 'Loss of Safety Function to (B) Remove Residual Heat' On December 23, 2009 at about 0957 PST, with SONGS Unit 2 defueled for the Cycle 16 refueling outage, a decrease in salt water cooling flow to the Train A Component Cooling Water Heat Exchanger indicated debris was entering the system. The loss of flow appears to have been caused by debris entering the system through a failed pump suction screen. At 1014 PST operators removed the heat exchanger from service for approximately one hour to reverse the salt water cooling flow though the heat exchanger and clear the debris. The Train B cooling system had previously been removed from service for scheduled maintenance, relying on the single Train A heat exchanger to supply cooling to the Spent Fuel Pool cooling system. Salt water cooling flow was fully restored at approximately 1118 PST. Operators conservatively declared the Spent Fuel Pool Cooling System inoperable and maintained compliance with the conditions of Licensee Controlled Specification 3.7.106. Time to exceed the 160 degree Fahrenheit allowable pool temperature was estimated at over twenty three hours. It has been determined that the temporary isolation of the heat sink from the spent fuel pool constituted a loss of safety function for residual heat removal. Therefore SCE is reporting this occurrence as a loss of safety function in accordance with 10 CFR 50.72(b)(3)(v). The safety significance of this event was minimal. Flow reversal to clear ocean debris from the heat exchangers is a routine procedurally controlled evolution and bounded by design calculations which consider post-accident heat loads with a full core offload in the spent fuel pool. These actions are within the limits of both the Technical Specifications and Licensee Controlled Specifications. The licensee will inform the NRC Resident Inspector.
ENS 4556412 December 2009 04:48:00San OnofreNRC Region 4CE

A declaration of Unusual Event per EAL D.1-1 was made at 0126 PST on 12/12/09 due to both EDGs being inoperable. This condition places the Unit in a required Technical Specification Shutdown condition and the Unit is proceeding to shutdown. Train "B" EDG was declared inoperable at 0025 PST on 12/11/09 due to annunciator issues associated with the EDG. The cause of the annunciator issues has still not been identified. This placed the licensee into the Action Statement for LCO 3.8.1 that required verification of operability of the Train "A" EDG within 24 hours. During the operability test of the Train "A" EDG, the diesel failed to reach voltage and frequency (the EDG tripped on startup) and it was also declared inoperable. As a result, the licensee entered Action F of LCO 3.8.1 and is required to be in Mode 3 within 6 hours and Mode 5 within 36 hours. The licensee declared the UE at 0126 and commenced power reduction. Mode 3 must be reached by 0625 PST on 12/12/09 and Mode 5 must be reached by 1225 on 12/13/09. Besides the EDGs, all other safety related systems are operable. The licensee has notified State and local authorities and the NRC Resident Inspector.

  • * * UPDATE FROM GEOFF COOK TO DONALD NORWOOD AT 0918 EST ON 12/12/2009 * * *

On December 12, 2009, at about 0025 PST, SONGS Unit 3 Emergency Diesel Generator (EDG) 3G002 was determined to be inoperable. EDG 3G003 had been declared inoperable prior to this, resulting in both Unit 3 EDGs being inoperable. At about 0025 on December 11, 2009, EDG 3G003 (Train 'B') was declared inoperable as a result of work being done on an annunciator power supply. SONGS Technical Specifications (TS), section 3.8.1.B, requires that the associated EDG, 3G002 (Train 'A') be tested within 24 hours to ensure that the EDG was also not inoperable due to a common cause. On December 12, 2009, at about 0025, EDG 3G002 was declared inoperable when it did not achieve required voltage and frequency during an attempted start. SCE is reporting this occurrence as a loss of safety function in accordance with 10 CFR 50.72(b)(3)(v). The loss of both EDGs on Unit 3, per TS 3.8.1.E, requires restoration of one EDG within 2 hours. This action was not met, and as a result TS 3.8.1.F required the unit to be shutdown to Mode 3 within 6 hours. This shutdown action began at 0126 PST. Also, pursuant to the SONGS Emergency Plan, the shutdown of Unit 3 under TS 3.8.1.F required declaration of an Unusual Event. Both the TS required shutdown action and the declaration of the Unusual Event were reported to the NRC pursuant to 10CFR50.72 in an earlier notification (same NRC Operations Log #45564). SCE is taking actions to restore one of the EDGs to operability. At the time of this occurrence, Unit 2 was in a Steam Generator Replacement Outage, and Unit 3 was at approximately 100% power proceeding to a Mode 3 shutdown. The NRC Resident Inspector has been notified of this occurrence and will be provided with a copy of this report. Notified R4DO (Spitzberg).

  • * * UPDATE FROM DOUG KNUDSON TO BILL HUFFMAN AT 1021 EST ON 12/12/2009 * * *

The licensee exited their Unusual Event (and TS required shutdown) at 0645 PST based on restoration of operability of the "B" Train EDG. The "B" Train EDG annunciator issue was repaired and the EDG started and load tested per Technical Specification requirements. The EDG was declared operable at 0511 PST. The licensee is currently holding at 40% and planning to return to full power. Investigation into the starting problem of the "A" Train EDG is still ongoing. The licensee has notified the NRC Resident Inspector, State and local authorities. R4DO(Spitzberg), NRR(McGinty), and IRD MOC (Grant) notified. Also notified DHS (Inzer) and FEMA (Via).

ENS 4546223 October 2009 17:46:00San OnofreNRC Region 4CEOn Friday October 23, 2009, at approximately 1205 PDT, Southern California Edison (SCE) evacuated Building E-50, which includes the SONGS (San Onofre Nuclear Generating Station) Emergency Operations Facility (EOF). This Building is located outside of both the Protected Area and the Owner Controlled Area. The evacuation was initiated due to personnel reports of a smoky odor in Building E-50. SONGS Fire Department responded to the incident and, at approximately 1222 PDT, the majority of Building E 50, including the EOF, was cleared for personnel to re-enter the building. SCE is continuing to investigate the source of the smoky odor. The EOF was considered unavailable (but fully functional) for approximately 17 minutes. The licensee notified the NRC Resident Inspector.
ENS 4534713 September 2009 16:12:00San OnofreNRC Region 4CEThe SONGS Unit 2 reactor automatically tripped from approximately 94% power at 1243 PDT due to loss of turbine load caused by lowering main condenser vacuum. Prior to the reactor trip, personnel were attempting to conduct a heat treat on Unit 2. During this evolution, Gate 5 in the main circulating water system was being repositioned when it stopped moving at 45 percent. This resulted in a recirculation and subsequent increase in circulating water temperature, a lowering main condenser vacuum, a loss of load on the main turbine, and an associated automatic reactor trip. All rods inserted on the automatic reactor trip and the electric grid is stable. This event report is being made under 10CFR50.72(b)(2)(iv)(B) as a valid Reactor Protection System actuation. Decay heat is being removed via normal feedwater to steam generators steaming through the condenser bypass valves to the main condenser. At the time of this event, SONGS Unit 3 was operating at approximately 99% power. The licensee notified the NRC Resident Inspector.
ENS 453283 September 2009 23:18:00San OnofreNRC Region 4CE

On September 3, 2009, at approximately 1730 PDT, Southern California Edison (SCE) was notified by a metal recycling vendor that a metal recycle load that was picked up at SONGS had been rejected at Terminal Island (Long Beach, CA) because it set off a radiation portal monitor as it was being processed through. The vendor (Alpert and Alpert) was requested to immediately ship the material back to SONGS. The County of Los Angeles Public Health, Radiation Management Division (Joji Ortego) called to confirm final destination, and a Special DOT Permit was issued to return the shipment to SONGS. The truck is currently returning to San Onofre where SCE Health Physicists will evaluate the load. SCE is reporting this event in accordance with 10CFR50.72(b)(2)(xi). SCE will provide an update to this report after the truck has returned to SONGS and the contents evaluated. At the time of this report, Unit 2 and Unit 3 were operating at about 99 and 100 percent power respectively. The NRC Resident Inspectors have been notified of this occurrence and will be provided with a copy of this report.

  • * * UPDATE FROM DAVID AXLINE TO CHARLES TEAL AT 1456 ON 09/04/09 * * *

The truck returned to SONGS site and SONGS has performed surveys on the contents of the truck cargo containers. SONGS' preliminary investigation did not identify any licensed radioactive material either internal or external to the containers. Surveys indicate that the source of the radiation appears to be boxes of ceramic tiles being removed from a storage area outside the Owner Controlled Area (OCA). Gamma isotopic analysis indicate the tiles appear to contain naturally occurring radioactive material (thorium byproducts). SONGS will continue to perform additional surveys to validate our initial conclusions. The NRC Resident Inspectors have been notified of this occurrence and will be provided with a copy of this report. Notified R4DO (Farnholtz).

ENS 4527419 August 2009 16:19:00San OnofreNRC Region 4CEDuring an exercise, sirens for the city of San Clemente (19 of 52 total sirens) were inadvertently actuated for approximately ten seconds. The licensee made off-site notifications to California FEMA, California Dept of Health, California State Parks, Camp Pendleton, and the cities of San Clemente, San Juan Capistrano, and Dana Point. The licensee has notified the NRC Resident Inspector.
ENS 4521220 July 2009 19:13:00San OnofreNRC Region 4CEA non-licensed supervisory employee had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access has been revoked. Contact the Headquarters Operations Officer for additional details. The licensee has notified the NRC Resident Inspector.
ENS 4520514 July 2009 22:18:00San OnofreNRC Region 4CE

On Monday July 13, 2009, at approximately 1100 PDT, Southern California Edison discovered a loss of the ability to activate 10 Community Alert Sirens (CAS) located on the Camp Pendleton Marine Corp Base. Prior to the discovery, the most recent test demonstrating operability of the sirens was performed on July 10, 2009, at approximately 1152 PDT. On July 13, 2009, at approximately 1130 PDT, SCE re-established the ability to activate the sirens. SCE is currently conducting an investigation to determine the cause of the problem, to try to ascertain the time that the loss of ability to activate the sirens occurred, and to identify the cause of the delay in reporting this event. SCE assumes the sirens were inoperable for greater than 48 hours, and therefore, is reporting this event as a loss of emergency offsite capability, in accordance with 10 CFR 50.72(b)(3)(xiii). At the time of this report, Unit 2 and Unit 3 were operating at about 99 percent and 100 percent power, respectively. A CAS power panel was found with a tripped breaker. An investigation into the cause of the breaker trip is ongoing. The licensee notified the NRC Resident Inspector.

  • * * UPDATE AT 1354 EDT ON 7/16/09 FROM M. MCBREATY TO CHARLES TEAL * * *

During a follow up investigation, SCE identified information to indicate the loss of the ability to activate the 10 Community Alert Sirens located on the Camp Pendleton Marine Corp Base occurred at approximately 1800 PDT on July 10, 2009. Therefore, the sirens were inoperable for greater than 48 hours. Additionally, SCE verified that, prior to the discovery of the inoperable sirens, the most recent test demonstrating operability of the sirens was performed on July 10, 2009 at 1053 PDT (not 1152 PDT as initially reported). The NRC Resident Inspector has been notified and will be provided with a copy of this report. Notified R4DO Vincent Gaddy.

ENS 4513817 June 2009 17:10:00San OnofreNRC Region 4CEA 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.
ENS 4498512 April 2009 13:47:00San OnofreNRC Region 4CEOn Sunday, April 12, 2009 at about 0430 PDT, Southern California Edison (SCE) discovered that approximately 300 gallons of sulfuric acid had overflowed from the Unit 3 Sulfuric Acid Day Tank. The acid was contained within a berm around the tank, and there was no release to the environment. SONGS (San Onofre Nuclear Generating Station) Hazardous Materials personnel are in the process of responding to this event. Once onsite they will remove the acid from the berm for disposal at a hazardous waste facility. The overflow was caused by leakage from the Bulk Acid Tank to the Acid Day Tank. At about 1004 PDT, SCE notified the San Diego County Department of Environmental Health, and at about 0940 PDT, SCE notified the California Office of Emergency Services. SCE is making this notification in accordance with 10CFR50.72(b)(2)(xi). At the time of the report, SONGS Unit 2 is in Mode 1 at approximately 99% power and Unit 3 is in Mode 1 at approximately 100% power. The NRC Senior Resident Inspector has been notified of this occurrence and will be provided with a copy of this report.
ENS 4498310 April 2009 18:21:00San OnofreNRC Region 4CEOn Friday April 10, 2009, at about 0900 PDT, Southern California Edison (SCE) discovered that approximately 1,000 gallons of sulfuric acid had overflowed from the Unit 3 Sulfuric Acid Day Tank. The acid was contained within a berm around the tank, and there was no release to the environment. SONGS (San Onofre Nuclear Generating Station) Hazardous Materials personnel responded to the event, and are in the process of removing the acid from the berm for disposal at a hazardous waste facility. The overflow was caused by leakage from the Bulk Acid Tank to the Acid Day Tank. At about 1340 PDT, SCE notified the San Diego County Department of Environmental Health, and at about 1353 PDT, SCE notified the California Office of Emergency Services. SCE is making this notification in accordance with 10CFR50.72(b)(2)(xi). At the time of this report, SONGS Unit 2 is in Mode 1 at approximately 99% power and Unit 3 is in Mode 1 at approximately 100% power. The NRC Senior Resident Inspector has been notified of this occurrence and will be provided with a copy of this report.
ENS 4489711 March 2009 19:49:00San OnofreNRC Region 4CEA 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 444561 September 2008 17:03:00San OnofreNRC Region 4CEOn 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 4437429 July 2008 19:09:00San OnofreNRC Region 4CEOn July 29, 2008, SCE issued a press release regarding the earthquake that occurred on the same day. Along with information on other facilities, the press release included information on San Onofre Nuclear Power Plant and stated: The earthquake was felt at the San Onofre Nuclear Generating Station site. There were no safety issues reported and no indications of any damage. The plant continues to operate normally. The NRC Resident Inspector has been notified.
ENS 4435518 July 2008 19:36:00San OnofreNRC Region 4CE

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.

  • * * UPDATE PROVIDED BY SUSAN GARDNER TO JASON KOZAL ON 7/19/08 AT 1705 * * *

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 442736 June 2008 04:48:00San OnofreNRC Region 4CEDuring the performance of stator water low flow testing a turbine trip and subsequent Reactor trip occurred on low cooling flow to the main generator rectifier. An Automatic Emergency Feedwater actuation signal occurred on low steam generator level due to unit trip. This is an expected actuation for a turbine/reactor trip from 100% power. The Engineered Safety Function Actuation operated as designed. On the Unit trip, the main feedwater pumps exhibited large rpm oscillations. Operators tripped one of the non-safety related main feed pumps, and placed the second in manual which stabilized the main feedwater system. When conditions allowed, operators placed the operating main feed pump in automatic control. All rods fully inserted successfully. All emergency systems operated as required. No PORV's or Safety valves lifted during this event. Auxiliary Feedwater system is available, but not in use at this time. RCPs are in operation transferring decay heat to steam generators. Main steam is being directed to main condenser via bypass. The licensee notified the NRC Resident Inspector.
ENS 4425130 May 2008 18:05:00San OnofreNRC Region 4CE

Southern California Edison has scheduled replacement of the backup diesel generator (DG) for the San Onofre Emergency Operations Facility (EOF), for Saturday May 31, 2008. While the new DG is being installed, the EOF will be inoperable. The EOF outage is expected to begin at about 0700 and last approximately 8 hours. The alternate EOF located in Irvine, CA, will be available should SONGS need to respond to an Emergency Event. The Emergency Recall System, which is housed in the EOF, will be out of service while the new DG is being installed. 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 10 CFR 50.72(b)(3)(xiii). At the time of this report, Unit 2 and Unit 3 were operating at about 99 percent and 98 percent power, respectively. The licensee notified the NRC Resident Inspector.

  • * * UPDATE AT 2324 ON 5/31/2008 FROM MIKE McBREARTY TO MARK ABRAMOVITZ * * *

The Emergency Operations Facility was returned to service on May 31, 2008 at 1810 PDT. SCE is continuing to troubleshoot problems identified with the transfer switch associated with the new backup diesel generator, and will inform the NRC Resident Inspectors when the backup DG is available. The licensee will notify the NRC Resident Inspector.

ENS 4424729 May 2008 18:06:00San OnofreNRC Region 4CE

On May 29, 2008, at approximately 1136 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 59.6 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 loss of generation in the Pacific Northwest. 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 Resident Inspector has been notified of this event and will be provided a copy of this report.

ENS 4422720 May 2008 18:44:00San OnofreNRC Region 4CE

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 4409225 March 2008 15:26:00San OnofreNRC Region 4CEOn 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 4393325 January 2008 14:43:00San OnofreNRC Region 4CE

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 4392823 January 2008 21:34:00San OnofreNRC Region 4CE

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 4383711 December 2007 17:53:00San OnofreNRC Region 4CEOn 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 436945 October 2007 18:45:00San OnofreNRC Region 4CEA non-licensed employee supervisor had a confirmed positive for alcohol during a random fitness-for-duty test. The employees access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.
ENS 4357919 August 2007 02:23:00San OnofreNRC Region 4CE

On August 18, 2007, at about 1955 PDT, both of SONGS Unit 3 Emergency Diesel Generators (EDG) were found in a condition that was not seismically analyzed. At about 2015 PDT on August 18, 2007, both of SONGS Unit 2 EDGs were found to be in the same unanalyzed condition. The condition involved EDG maintenance work platforms that had not been properly restrained, and, in the position found, could potentially render the EDGs inoperable during a seismic event. SCE is reporting this occurrence as a potential loss of safety function in accordance with 10CFR50.72(b)(3)(v). SCE took immediate actions to properly restrain the EDG work platforms, and an evaluation will be conducted to determine the cause of this event. At the time of this occurrence, Unit 2 was operating at about 99% power and Unit 3 was operating at about 100% power. SCE has notified the NRC Senior Resident Inspector about this occurrence and will provide them with a copy of this report.

  • * * UPDATE AT 1853 EDT ON 09/14/07 FROM SUSAN GARDNER TO S. SANDIN * * *

The licensee is retracting this report based on the following: On August 18, 2007, SCE reported that Emergency Diesel Generator (EDG) work platforms on both Units 2 and 3 had not been properly restrained. This resulted in a condition unanalyzed for seismic events. Consequently, both trains of EDGs on both Units 2 and 3 were declared inoperable. SCE evaluated configuration of the platforms for vulnerabilities to a design bases event. SCE concluded that the DGs were operable as-found. Consequently, SCE is retracting the phone report to the NRC (Event Log No. 43579)." The licensee will inform the NRC Resident Inspector. Notified R4DO (Jones).

ENS 4343521 June 2007 03:24:00San OnofreNRC Region 4CEAt 2250 on 6/20/07, "Instrument Air header pressure failed at a brazed joint. The loss of Instrument Air pressure caused the Steam Generator (S/G) Feedwater Regulating Valves to stop controlling and S/G level, E-088, to rise uncontrolled. Control Room Operators tripped the reactor manually. Main Feedwater Pumps were manually tripped to stop excess feedwater to the S/Gs. Loss of Instrument Air failed the normal cooling to Containment. Containment Emergency Cooling units were manually started to provide containment cooling. The standard post trip actions were carried out with all safety functions satisfied." The site is proceeding with post trip recovery. The Instrument Air leak was isolated at 2321 PDT. All control rods fully inserted on the manual trip. RCPs are in operation transferring decay heat to the S/Gs. Emergency feedwater is feeding the S/Gs with steam being discharged to the condenser via the steam dumps. Atmospheric relief valves were used to discharge steam to the atmosphere initially for approximately 20 minutes following the trip. There are no primary to secondary tube leaks. Containment isolation failed closed as expected following the loss of instrument air pressure to the containment. Normal offsite power is available and the emergency diesel generators are available if needed. The licensee notified the NRC Resident Inspector.
ENS 432072 March 2007 17:03:00San OnofreNRC Region 4CE

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.

  • * * RETRACTION PROVIDED BY S.GARDNER TO KOZAL ON 3/16/07 1728 EDT * * *

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 4276714 August 2006 15:08:00San OnofreNRC Region 4Westinghouse PWR 3-LoopOn Monday, August 14, 2006, Southern California Edison (SCE) made a voluntary communication to California State and Local government agencies regarding water samples taken during on-going Unit 1 decommissioning activities. During the week of August 7, 2006, water samples were found to have tritium levels ranging from 50,000 -- 330,000 picoCuries/liter. No permits were violated. It was thought that the contamination may be attributed to historical events during Unit 1 operation (Unit 1 ceased commercial operation in 1992). SCE is investigating the source of the tritium and, as part of decommissioning, will remediate the contamination. The groundwater beneath SONGS is not a source of drinking water. The NRC Resident Inspectors have been notified of this occurrence and will be provided with a copy of this report.
ENS 4264415 June 2006 15:31:00San OnofreNRC Region 4Westinghouse PWR 3-Loop
CE

On Tuesday, June 13, 2006, at approximately 2205 PDT, an on duty SONGS security officer driving an SCE vehicle struck a pedestrian on a public road outside the Owner Controlled Area. At that time, the officer was performing routine rounds and was driving between the plant and SCE's MESA facility. SCE notified local authorities including the California Highway Patrol and the Orange County Fire Authority.

The individual sustained serious injuries and was transported to a local hospital. SCE has been notified unofficially that the individual passed away on June 14, 2006. The identity of the individual is unknown by SCE. SCE is reporting this occurrence in accordance with 10CFR50.72(b)(2)(xi). No news release is planned by SCE at this time. At the time of this report, Units 2 and 3 were operating at about 99 and 100 percent power, respectively. The NRC Resident Inspectors have been notified of this occurrence and will be provided with a copy of this report.

ENS 4245129 March 2006 06:34:00San OnofreNRC Region 4CE

On March 27, 2006, with Unit 2 in Mode 4 while starting up from a refueling outage, (Southern California Edison (SCE)) discovered that the gasket used to seal the manway cover for Safety Injection Tank (SIT) T-008 had become partially dislodged. The gasket is a 'flexitalic' type gasket which consists of a long section of crushable wire that is coiled and compressed between the manway cover and the safety injection tank flange. For SIT T-008, the flexitalic gasket had uncoiled and extended down into the SIT and prevented SIT outlet check valve MU040 from fully sealing in the closed position. On March 28, SCE inspected the remaining three SITs (SITs # 007, 009 and 010) and found the flexitalic gaskets degraded but intact and not interfering with other components.

When this condition was discovered at Unit 2, San Onofre Unit 3 was operating at approximately 100 percent power. Similar flexitalic gaskets are also used for the manway covers on the four SITs at Unit 3. At 0001 PST on March 29, 2006, SCE conservatively declared both trains of the emergency core cooling system at Unit 3 inoperable. This placed Unit 3 in a TS 3.0.3 shutdown action statement. Plant Operators began the required Unit 3 shutdown at about 0050 on March 29, 2006. SCE is providing this phone notification to the NRC in accordance with 10 CFR 50.72(b)(2)(i) for the initiation of any nuclear plant shutdown required by the plant's Technical Specifications. The electric grid in the area is stable and Emergency Diesel Generators are available on Unit 3. There is no maintenance being performed on systems required for shutdown on Unit 3. The licensee notified the NRC Resident Inspector.

  • * * RETRACTION AT 12:14 ON 5/30/2006 FROM L. CONKLIN TO ABRAMOVITZ * * *

On March 29, 2006, SCE reported the initiation of the shutdown to the NRC Operations Center (Event Log No. 42451). At the time, SCE was concerned that if the gaskets were uncoiled they might have interfered with operation of the ECCS. After completing the plant shutdown, SCE inspected and found the gaskets degraded but not extending into the SIT and its discharge piping. In addition, subsequent evaluations by the SONGS NSSS vendor Combustion Engineering (now Westinghouse) determined the degraded gaskets (even if uncoiled and interfering with SIT outlet check valve from fully closing) would not have prevented the ECCS from performing its required safety function. Consequently, SCE was not required to declare Unit 3 ECCS inoperable and SCE is retracting the phone report to the NRC (Event Log No. 42451). SCE will submit a voluntary LER to document this condition. At the time of this report, Unit 2 and Unit 3 are in Mode 1 at approximately 100% power. The San Onofre Resident Inspector has been notified of this event and will be provided with a copy of this report. Notified the R4DO (Spitzberg).

ENS 4237023 February 2006 15:07:00San OnofreNRC Region 4Westinghouse PWR 3-Loop

On February 22, 2006, at 1000 PST, two tankers containing wastewater with trace levels of radioactivity departed San Onofre Nuclear Generating Station (SONGS) Unit 1 Industrial Site for Clive, Utah. Each truck contained about 4500 gallons of water. At about 0400 PST February 23, 2006, SCE was notified by the trucking company (Triad Transport Company) that minor leakage from a valve on top of one of the trucks had been observed. The leakage was observed while the truck was stopped in Parawan, Utah approximately 4 hours from its destination. The driver of the truck immediately notified his management who traveled to the site, identified the origin of the leak as spray from a valve on top of the truck, relieved the tank pressure from a vent valve, and stopped the leak. Dampness was observed on the ground beside the tanker. Unconfirmed measurements indicate radiation levels are near background. SCE has dispatched a team to the site to coordinate remediation efforts as necessary. The second tanker has arrived at the site in Clive, Utah and no leakage was observed during receipt inspection. The Director of the Utah's Division of Radiation Control and the NRC Resident Inspectors have been notified of this occurrence. At the time of this report, Unit 1 was undergoing decommissioning. The activity from the radionuclides in the entire truck totaled 70.9 mCi, and primarily consisted of Cs-137 (41 mCi), Ni-63 (15 mCi), and Co-60 (5 mCi). The transport company notified the National Response Center. The truck traveled thru 4 States: CA, NV, AZ UT.

  • * * UPDATE FROM C. WILLIAMS TO M. RIPLEY 1607 EST 03/01/06 * * *

On February 23, 2006, SCE notified the NRC that a small leak had been identified from a tanker that was transporting wastewater with trace levels of radioactivity from SONGS to Clive, Utah. That incident was reported to the NRC in accordance with 10CFR50.72.(b)(2)(xi) and the Utah Division of Radiation Control. SCE is updating this report to provide the NRC with the following remediation status: 1. SCE has decontaminated the tanker exterior and the leaking flange has been repaired. On February 24, 2006, the tanker completed its trip to the disposal site in Clive, Utah. Enroute, SCE personnel followed the tanker and inspected the flange at planned stops every hour. No leakage was observed and the tanker was received at the disposal facility without further incident. 2. SCE surveyed the truck stop in Parowan and identified two contaminated locations. The first was an asphalt area near the diesel pumps; the second was a gravel area where the truck had parked (about 150 yards from the diesel pumps). All contaminated materials including asphalt, concrete, dirt, and gravel were removed and shipped to the disposal site in Clive, Utah. No detectable levels of licensed material remain at the truck stop. 3. SCE surveyed personnel at the truck stop and determined that one individual had been contaminated. The pants leg of the trucking supervisor who had climbed on top of the truck to stop the leak had been contaminated (SCE took possession of the contaminated garment). There was no contamination on his skin. 4. Approval was obtained from the Utah Division of Radiation Control, the remediated areas of the truck stop were backfilled. 5. SCE is continuing to investigate the cause of the flange leak and will implement appropriate corrective actions. The NRC resident Inspectors have been notified of this update and will be provided with a copy of this update. Notified R4 DO (J. Whitten) and NMSS EO (S. Flanders)

ENS 423104 February 2006 00:46:00San OnofreNRC Region 4CEOn February 3, 2006, at about 1646 PST the Devers-Palo Verde line relayed. This required an evaluation of grid nomograms for San Onofre. At about 1815 PST, the Grid Control Center (GCC) notified San Onofre that the grid nomograms predicted offsite power would not be within limits if San Onofre Unit 3 were to trip (San Onofre Unit 2 is currently shutdown in a refueling outage and Unit 3 is operating at about 100 percent power). Plant Operators declared offsite power inoperable at about 1815 PST. At about 1843 PST, the GCC notified San Onofre that the grid operator added generation to the grid and that offsite power was within nomogram limits. Plant Operators declared offsite power operable at that time. Consistent with the guidance provided in NUREG-1022, Rev. 2, Southern California Edison is reporting this event in accordance with 10CFR50.72(b)(3)(v)(D). All four San Onofre diesel generators (two per Unit) remained operable during this event. The San Onofre Senior Resident Inspector has been notified of this event and will be provided with a copy of this report.
ENS 4225211 January 2006 20:43:00San OnofreNRC Region 4CE

On Wednesday, January 11, 2006, at approximately 1248 PST, with San Onofre Unit 2 in Mode 5 (loops not filled), Southern California Edison (SCE) declared both trains of the Shutdown Cooling (SDC) System inoperable. This action was taken following discovery and evaluation of an approximate 1.5 inch crack and minor leak (about 10 drops per minute) in a line located at the Low Pressure Safety Injection (LPSI) common discharge header (the LPSI pumps are also used as the SDC system pumps). Although both trains of the SDC system remain functional and one train is in service, SCE declared both SDC trains inoperable because the affected pipe might not be ASME Code qualified as a result of this crack. SCE is conservatively reporting this event in accordance with 10CFR50.72(b)(3)(v)(B) as a condition that could prevent the remove residual heat. SCE is continuing to evaluate this condition. SCE is following the actions required by Technical Specifications 3.4.8, and will repair the pipe crack during the current refueling outage, after the reactor core has been off-loaded to the spent fuel pool. SCE expects to place the plant in Mode 6 tomorrow. At the time of this report, Unit 2 is in Mode 5 and Unit 3 is in Mode 1 at 100% power. The NRC Senior Resident Inspector, NRC Region IV, and the Nuclear Reactor Regulation Project Manager have been briefed of this event and will be provided with a copy of this report. Shutdown cooling has been running for approximately one week and the leak was initially discovered sometime on 01/10/06 during an inspection in which Boric acid accumulation was discovered . A work request was written to perform a more thorough inspection that was performed on 01/11/06. The crack is on an 8 inch line that returns to RCS Loop 2A which is normally isolated during high pressure shutdown conditions and reactor power operation.

  • * * RETRACTION FROM C. WILLIAMS TO W. GOTT AT 2039 EST ON 3/3/06 * * *

On January 11, 2006, Southern California Edison (SCE) reported to the NRC that both trains of Shutdown Cooling System (SDC) were inoperable at San Onofre Unit 2 due to a through-wall crack in a pipe in the common discharge header. That occurrence was reported to the NRC in accordance with 10CFR50.72(b)(3)(v)(B) for a condition that could prevent the removal of residual heat. SCE has since analyzed the pipe integrity at the design basis conditions and determined the pipe would have remained intact and that system leakage through the crack would have remained below the allowable system leak rate. Based on these results, SCE concluded that the pipe was capable of performing its safety functions under design basis conditions. Because the system was always capable of performing its safety function, SCE is retracting the January 11, 2006 report. Nevertheless, SCE plans to submit a voluntary licensee event report to document this event and inform the NRC of the corrective actions taken. At the time of this phone call, Unit 2 was in the middle of the Cycle 14 refueling outage and Unit 3 was at about 100 percent power. SCE has notified the NRC resident inspectors about this retraction and will provide them with a copy of this report. Notified R4DO (J. Whitten)

ENS 4195829 August 2005 14:18:00San OnofreNRC Region 4CE

On August 29, 2005 at about 1045 PDT, San Onofre Nuclear Generating Station, Unit 3, removed a portion of the Safety Parameter Display System (SPDS) and the Emergency Response Data System (ERDS) from service for a planned upgrade to ensure long-term reliability and improve the human-machine interface. This work is expected to complete within seven days. The SPDS emergency assessment function at San Onofre is implemented by a combination of the Qualified Safety Parameter Display System (QSPDS) and the Critical Function Monitoring System (CFMS). The QSPDS portion, which provides emergency assessment capability to plant operators in the control room, will remain functional. The CFMS portion, which receives input from the QSPDS, implements the ERDS and communicates data to the Technical Support Center and Emergency Offsite Facility. Only the CFMS and ERDS are impacted by this upgrade. This planned CFMS outage is being reported in accordance with10CFR50.72(b)(3)(xiii) as a courtesy notification even though only a portion of the SPDS will be removed from service and preplanned compensatory measures will be in place for the duration of the work.

"At the time of this report, Unit 2 and Unit 3 were operating at about 99 percent and 100 percent power, respectively.  The NRC Resident Inspectors will be notified of this occurrence and will be  provided with a copy of this report.
* * *  UPDATE ON 09/04/05 AT 0249 FROM C. WILLIAMS TO P. SNYDER  * * * 

The CFMS upgrade work was completed on September 3, 2005 at 2255 PDT. The SPDS and ERDS have been returned to service. The NRC Resident Inspectors will be notified of this occurrence. Notified R4DO (Smith).

ENS 4193520 August 2005 19:16:00San OnofreNRC Region 4CE

Section 4.1 of Appendix B of the Operating License for Units 2 and 3 requires Southern California Edison (SCE) to report to the NRC within 24 hours any unusual or important environmental events, which includes unusual fish kills.

Between August 19 and August 20, 2005, SCE removed an unusually large number of fish from the Units 2 and 3 intake structure. At approximately 1000 PDT on August 20, 2005, SCE estimated the quantity to be approximately 11,070 pounds (approximately 6420 pounds from Unit 2 and 4650 pounds from Unit 3). While the NRC has not specified a reporting limit for an unusual fish kill, SCE has internally defined this quantity as 4500 pounds. This unusual influx of fish is unrelated to plant operation and a heat treat of the intake structure was not being performed. However, there is a heat treat of the San Onofre Unit 2 intake structure scheduled for later today. The licensee stated that the fish kill was apparently the result of a large school of anchovies that swam to close to the intake. The licensee notified the NRC Resident Inspector.

ENS 4184615 July 2005 16:26:00San OnofreNRC Region 4CEA non-licensed employee supervisor was determined to be under the influence of alcohol during a random fitness-for-duty test. The employee's access to the plant has been suspended. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.
ENS 4179826 June 2005 14:52:00San OnofreNRC Region 4CE

On June 25, 2005, at about 1335 PDT, during a test of Unit 3 Emergency Diesel Generator (EDG) 3G003, Emergency Supply Fan 3A276 did not start. SCE's investigation found a loose electrical connection at the thermal overload auxiliary switch contact for that fan. A similar condition was found on Emergency Supply Fan 3A277. SCE declared 3G003 inoperable and initiated a common cause investigation required by the EDG Technical Specifications. SCE tightened the affected electrical connections and after successfully start testing 3G003, declared 3G003 operable at 0406 PDT on June 26, 2005. On June 26, 2005, at about 0417 PDT, SCE found similar loose connections for EDG 3G002. Components affected were the EDG radiator fan and an EDG Emergency Supply Fan. Because SCE could not conclusively determine if the loose connections would have caused 3G002 to be inoperable, SCE conservatively declared 3G002 inoperable. (SCE currently plans to start test the Unit 2 EDGs today to confirm the Unit 2 EDGs remain operable.) Because it appears that both Unit 3 EDGs could have been inoperable at the same time, SCE is reporting this occurrence in accordance with 10CFR50.72(b)(3)(v)(D) as an event or condition that could have prevented fulfillment of a safety function. At the time of this occurrence, Unit 2 was operating at about 99 percent power and Unit 3 was 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.

  • * * RETRACTION FROM LICENSEE (HOLT) TO NRC (HUFFMAN) AT 1850 EDT ON 8/23/05 * * *

On June 26, 2005, SCE reported to the NRC that both Unit 3 emergency Diesel Generators (EDGs) were conservatively declared inoperable at the same time. SCE reported that occurrence to the NRC in accordance with 10CFR50.72(b)(3)(v)(D) for the loss of a safety function. SCE has since determined that both EDGs were operable in the as found condition and that a report to the NRC was not required and SCE is retracting that report. For EDG 3G003, even though one of two emergency supply fans did not function, SCE confirmed by calculation that the remaining emergency supply fan was sufficient. That is, 3G003 was capable of performing its specified safety function with only one emergency supply fan operating. For EDG 3G002, the electrical connections that were reported to be 'loose' did not prevent circuit continuity and did not degrade the operability of the EDG. 3G002, therefore remained operable. Because the EDGs were operable, no report was required. SCE is retracting the June 26, 2005 report. SCE will, however, submit a voluntary licensee event report to document this event and inform the NRC of the corrective actions taken. At the time of this phone call, Unit 2 was operating at about 99 percent power and Unit 3 was at about 100 percent power. SCE has notified the NRC resident inspectors about this retraction and will provide them with a copy of this report. R4DO (Smith) was notified.

ENS 417453 June 2005 14:57:00San OnofreNRC Region 4Westinghouse PWR 3-Loop
CE
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 terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.
ENS 4149214 March 2005 19:37:00San OnofreNRC Region 4CEA non-licensed employee was determined to be under the influence of illegal drugs during a random test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.
ENS 414779 March 2005 20:36:00San OnofreNRC Region 4CE

The following information was obtained from the licensee via e-mail (licensee text in quotes): On Thursday, March 10, 2005 San Onofre Nuclear Generating Station, Unit 2, will remove a portion of the Safety Parameter Display System (SPDS) and the Emergency Response Data System (ERDS) from service for a planned upgrade to ensure long-term reliability and improve the human-machine interface. This work is expected to complete within seven days. The SPDS emergency assessment function at San Onofre is implemented by a combination of the Qualified Safety Parameter Display System (QSPDS) and the Critical Function Monitoring System (CFMS). The QSPDS portion, which provides emergency assessment capability to plant operators in the control room, will remain functional. The CFMS portion, which receives input from the QSPDS, implements the ERDS and communicates data to the Technical Support Center and Emergency Offsite Facility. Only the CFMS and ERDS are impacted by this upgrade. This planned CFMS outage is being reported in accordance with 10CFR50.72(b)(3)(xiii) as a courtesy notification even though only a portion of the SPDS will be removed from service and preplanned compensatory measures will be in place for the duration of the work. At the time of this report, Unit 2 and Unit 3 were operating at about 79 percent and 99 percent power, respectively. The NRC Resident Inspectors will be notified of this occurrence and will be provided with a copy of this report. Should an emergency event occur, the licensee intends to transmit emergency response data to the NRC via facsimile and voice via the emergency notification system. No electronic data will be sent to the NRC Operations Center for the outage duration.

  • * * UPDATE FROM CLAY WILLIAMS TO HOWIE CROUCH ON MARCH 18, 2005 @ 1551 EST * * *

The CFMS upgrade work was completed on March 17, 2005 at 2310 PST. The SPDS and ERDS have been returned to service. The licensee has notified the NRC Resident Inspector. Notified R4DO (Farnholtz).

ENS 4141015 February 2005 01:13:00San OnofreNRC Region 4CE

The following information was provided by the licensee via e-mail: On February 10, 2005, plant operators observed an abnormal flow condition on Unit 2 Train 'B' Component Cooling Water (CCW) from the Shutdown Cooling Heat (SDC) exchanger and, at about 2315 PST, declared Train 'B' of Containment Spray inoperable. This caused Unit 2 to enter a seven-day action statement (TS 3.6.6.1).

Although it may have been possible to correct the abnormal flow condition on-line, SCE has elected to shutdown Unit 2. Plant Operators initiated the shutdown at about 2155 PST on February 14, 2005. SCE in reporting this occurrence in accordance with 10CFR50.72(b)(2)(i). 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.

ENS 413683 February 2005 18:02:00San OnofreNRC Region 4CEOn February 3, 2005, at about 1227 PST, SONGS Unit 2 tripped from about 100 percent power. Preliminary information indicates that the Unit 2 Unit Auxiliary Transformer tripped on high differential current, which caused the main generator to trip and caused the Reactor Protection System to automatically trip the reactor, as expected. Auxiliary Feedwater system actuated as designed and the Unit remains stable in Mode 3 on Main Feedwater. SCE's investigation is ongoing. SCE is reporting this occurrence in accordance with 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv). At the time of this event, SONGS Unit 3 was at about 100 percent power. The NRC resident inspectors are aware of this event and SCE will provide them with a copy of this report. All control rods fully inserted. Decay heat is being rejected to the main condenser. All ESF systems are available and the electrical grid is stable.
ENS 4132010 January 2005 00:56:00San OnofreNRC Region 4Westinghouse PWR 3-Loop
CE

The following information was received from the licensee via e-mail: On January 9, 2005, at about 1945 PST, the access road to the SONGS MESA facilities became flooded after several days of rain. The San Onofre Emergency Operations Facility (EOF) is located at the MESA and because of the flooding, is inaccessible to passenger vehicles. While the EOF itself is operable, in the event of an Emergency at San Onofre, SCE would direct EOF emergency responders to the alternate EOF located in Irvine, California. SCE is reporting this occurrence to the NRC in accordance with 10CFR50.72(b)(3)(xiii). At the time of this occurrence, Unit 2 was operating at about 100% power and Unit 3 was operating at about 65% power. SCE will notify the NRC resident inspectors about this occurrence and will provide them with a copy of this report.

  • * * UPDATE PROVIDED BY C. WILLIAMS TO JEFF ROTTON AT 1418 EST ON 01/10/05 * * *

On January 10, 2005 at about 0143 PST, flooding had dissipated sufficiently for one lane to be passable; at 0615 PST, both lanes were passable. In the event of an Emergency at San Onofre, there is no longer a need to redirect emergency responders to the alternate EOF located in Irvine, California. This report is to advise the NRC of this change in EOF access status. Also note that it is continuing to rain at SONGS and this status is subject to change. At the time of this report, Unit 2 was operating at about 85% power and Unit 3 was at about 80% power. SCE has informed the NRC resident inspectors and will provide them with a copy of this report. Notified R4DO (Bywater).

  • * * UPDATE PROVIDED BY C. WILLIAMS TO HOWIE CROUCH @ 0425 EST ON 01/11/05 * * *

On January 11, 2005, at about 0041 PST, the access road to the SONGS MESA facilities again became flooded after several days of rain (reference NRC Operations Log Number 41320). The San Onofre Emergency Operations Facility (EOF) is located at the MESA and because of the flooding, is inaccessible to passenger vehicles. While the EOF itself is operable, in the event of an Emergency at San Onofre, SCE would direct EOF emergency responders to the alternate EOF located in Irvine California. SCE is reporting this occurrence to the NRC in accordance with 10CFR50.72(b)(3)(xiii). At the time of this occurrence, Unit 2 was operating at about 85% power and Unit 3 was at about 80% power. SCE will notify the NRC resident inspectors about this occurrence and will provide them with a copy of this report. Notified R4DO (Bywater).

  • * * UPDATE 1430 EST ON 1/11/05 FROM CLAY WILLIAMS TO S. SANDIN * * *

On January 11, 2005, at 0125 PST, Southern California Edison (SCE) reported that the access road to the SONGS MESA facilities had again flooded after several days of rain and that the SONGS Emergency Operations Facility (EOF) was inaccessible to passenger vehicles (NRC Operations Log Number 41320). On January 11, 2005 at about 0535 PST, flooding had dissipated sufficiently for the road to be passable. In the event of an Emergency at San Onofre, there is no longer a need to redirect emergency responders to the alternate EOF located in Irvine California. This report is to advise the NRC of this change in EOF access status. At the time of this report, Unit 2 was operating at about 85% power and Unit 3 was at about 81% power. SCE has informed the NRC resident inspectors and will provide them with a copy of this report. Notified R4DO (Russ Bywater).

ENS 4120919 November 2004 12:25:00San OnofreNRC Region 4CEThe following information was obtained from the licensee via facsimile: 1. SYSTEMS AFFECTED: Reactor trip, Aux feed water actuation. 2. ACTUATIONS AND THEIR INITIATING SIGNALS: Reactor trip - Loss of Load Turbine Trip, Aux Feed Water (AFW) - 21% (on the narrow range indication) in Steam Generators. 3. CAUSES: Reactor tripped due to an undetermined cause in the main generator end of the secondary plant. AFW started as expected on EFAS (Emergency Feedwater Actuation Signal) at 21% from a trip at 100%. 4. EFFECT OF EVENT ON PLANT: Plant is stable at 545F (and) 2250 (psi) hot standby conditions and will remain here until cause determination made as to cause of trip. 5. ACTIONS TAKEN OR PLANNED: Maintain hot standby conditions for post trip review. CONTINUATION SHEET: 1) Remain in Mode 3 for cause determination post-trip review to provide actual mode required. 2) Estimate restart date pending cause determination and any repairs required. 3) All rods inserted, no primary or secondary reliefs lifted, electrical grid stable, all safety systems performed as expected, no effect on Unit 3. Electrical power supplied from offsite power. Decay heat removal is via steam dump to condenser. The licensee has notified the NRC Resident Inspector.
ENS 4115027 October 2004 13:05:00San OnofreNRC Region 4CEIllegal drug use was detected during a random drug test of a non-licensed employee. The employee's access to the plant has been terminated. Contact the HOO for additional details. The NRC Resident Inspector was notified by the licensee.
ENS 4089724 July 2004 18:20:00San OnofreNRC Region 4Westinghouse PWR 3-LoopOn July 24, 2004, at about 1000 PDT, SCE (Southern California Edison) personnel were tightening two seismic restraint bolts on Advanced Horizontal Storage Module (AHSM) Number 10 at the Unit 1 ISFSI (Independent Fuel Storage Installation) when one of the bolts failed. SCE had placed the storage canister into AHSM No. 10 on July 18, 2004 and was tightening the restraint as specified in the final safety analysis report, after the module had reached thermal equilibrium. SCE plans to replace the failed bolt with another bolt manufactured under the same Certificate of Compliance and will tighten the seismic restraints within the period allowed by the FSAR (one week from initial placement of the storage canister). SCE's evaluation of the failed bolt is ongoing. SCE has notified the NRC resident inspectors about this occurrence and will provide them with a copy of this report.
ENS 4081814 June 2004 17:14:00San OnofreNRC Region 4CEOn June 14, 2004 at 0741 PDT, the offsite power grid connected to San Onofre experienced a system disturbance. Grid frequency dipped to about 59.7 Hz or slightly lower, and then recovered about three minutes later. Plant Operators declared offsite power inoperable. Southern California Edison is conservatively reporting this event in accordance with 10 CFR 50.72(b)(3)(v)(D). The diesel generators for both Units 2 and 3 were operable during this event. At the time of this report, Units 2 and 3 continue to operate at about 100% power. The NRC Resident Inspector was notified. NOTE: see events 40814, 40815 and 40816
ENS 407914 June 2004 08:21:00San OnofreNRC Region 4CESan Onofre Nuclear Generating Station (SONGS) experienced a large influx of seaweed that required securing one of the four running Circulating Water (CW) pumps. When conditions continued to degrade, the Operations Department decided to manually trip the unit. During the trip, all control rods inserted into the core. No manual or power-operated relief valves lifted during the transient. Decay heat is being removed via the atmospheric dump valves. There is no known primary-to-secondary leakage. The Operations staff is maintaining the unit at normal operating pressure and temperature. The electrical grid is stable. Currently, only one CW pump is running. Unit 2 is unaffected and is not experiencing a seaweed influx at this time. The licensee has informed the NRC Resident Inspector
ENS 4077525 May 2004 20:02:00San OnofreNRC Region 4CEA licensed employee was administered a random drug test. He tested positive for an illegal substance. The Medical Review Officer reviewed the test results with the licensed employee. His access was immediately terminated for the protected area and he was placed on investigatory suspension. Contact the Headquarters Operations Officer for details. The NRC Resident Inspector will be informed by the licensee.
ENS 4066410 April 2004 16:54:00San OnofreNRC Region 4CESan Onofre Unit 2 was manually tripped from 97% power due to the loss of feed water pumps. After both feedwater pumps tripped, the operators manually tripped the reactor. Both trains of the emergency feed water system actuated as expected due to the initial power level. The plant is stable at NOP/NOT. The cause of the feed water pump trips is being evaluated. All control rods fully inserted and all safety systems worked properly. The steam generators are discharging steam to the main condenser using the turbine bypass valves. AFW pumps are running to maintain steam generator water levels. The Licensee notified the NRC Resident Inspector.
ENS 4061928 March 2004 21:25:00San OnofreNRC Region 4CEAt about 1349 (PST) on March 28, 2004, while a Security Offer was receiving his weapon in the armory, the weapon accidentally discharged as it was being holstered. The discharge grazed the officer's leg and the officer was treated for the resulting abrasion. At about 1425 PST, Southern California Edison notified the FBI (SONGS LLEA). SCE is reporting this occurrence in accordance with 10CFR50.72(b)(2)(xi). The NRC Resident Inspector was notified.
ENS 405043 February 2004 19:05:00San OnofreNRC Region 4CESection 4.1 of Appendix B of the Operating License for Units 2 and 3 requires Southern California Edison (SCE) to report to the NRC within 24 hours any unusual or important environmental events, which includes unusual fish kills. Between February 2 and February 3, 2004, SCE removed an unusually large number of sardines from the Units 2 and 3 intake structure. At approximately 1100 on February 3, 2004, SCE determined the quantity to be approximately 13,590 pounds (approximately 6940 pounds from Unit 2 and 6650 pounds from Unit 3). While the NRC has not specified a reporting limit for an unusual fish kill, SCE has internally defined this quantity as 4500 pounds. SCE believes the unusual influx of sardines may be related to current winter storm conditions. The NRC Resident Inspectors have been notified The licensee will also give a courtesy call to the San Diego Regional Water Quality Control Board
ENS 4039617 December 2003 08:35:00San OnofreNRC Region 4CEThe following information was obtained from the licensee via facsimile: 1. SYSTEMS AFFECTED: High Pressure Safety Injection (HPSI), Low Pressure Safety Injection (LPSI), Recirculation Actuation (System) (RAS), Containment Spray (CS). 2. ACTUATIONS AND THEIR INITIATING SIGNALS: None 3. CAUSES: 400 (volt) Motor Control Center (MCC) 3BE deenergized due to an overcurrent condition on the 'A' train 1E bus. 'B' train equipment is cleared for maintenance causing Technical Specification 3.0.3 entry. 4. EFFECT OF EVENT ON PLANT: Both trains of Safety Injection equipment inoperable with no flow capability requiring plant shutdown. 5. ACTIONS TAKEN OR PLANNED: Shutdown commenced at 0410 (PST). MCC 3BE is stripped and loads will be checked for faults while attempting to restore the bus. Train 'B' equipment will be restored as soon as possible. Continuation Sheet: Power/Mode will be reduced per T.S. 3.0.3 action until MCC 3BE loads restored or Tr(ain) 'B' equipment returned to service. (Plant required to be in) Mode 3 (within) 7 hrs, Mode 4 (within) 13 hrs. (and) Mode 5 (within) 37 hrs. No abnormal electrical lineups. No effect on Unit 2. LPSI pump/valves will need to be restored to allow Mode 5 entry. Plant personnel suspect a problem with the 1E bus feeder breaker. A new breaker will be installed after testing is completed. Bus loads are in the process of being checked for problems. At the time of the initial call, plant power was at 80% and decreasing at approximately 10% per hour. At 0939 PST, plant power was at 71% and decreasing. The 1E bus have been meggered with no problems found. Battery chargers are currently not operating due to loss of the buses but not expected to be a problem since DC loads are very low during mode 1 operations. The licensee has notified the NRC Resident Inspector.