ROSEMEAD, Calif., Dec. 3, 2012 — The last of four retired steam generator lower assemblies from Southern California Edison’s (SCE) San Onofre Nuclear Generating Station will soon be shipped by truck to a disposal site in Clive, Utah.
The first two retired steam generators were transported to Utah last year and the third one was transported last month. All shipments were completed safely and successfully.
The original steam generator lower assembly has been packaged to meet all Department of Transportation and Nuclear Regulatory Commission regulations. As a result, the potential exposure to an individual from the original steam generator lower assembly is very low — if you stood roughly six feet away for an hour you would get the equivalent amount of exposure as you would from a dental x-ray — and there will be no measurable radiation exposure for local communities as the steam generator transport moves safely through California on its way to Utah.
This shipment is Class A low level radioactive waste, the lowest class level.
- Department of Transportation regulations limit the dose rate of transported materials to less than 10 millirems per hour at a distance of two meters from the vehicle — the dose rate for this shipment at two meters is 3.7 millirems per hour or less.
- The measured dose rate from the cab of the truck hauling the shipment is less than 0.2 millirems per hour. The Department of Transportation limit for the driver is 2 millirems per hour.
Examples of radiation exposure:
- Watching TV for a year will expose you to 1 millirem of radiation.
- Flying round-trip cross-country exposes you to 3–5 millirems.
- Living in a structure made of adobe/stone/brick for a year exposes you to roughly 7 millirems.
Unit 2 remains shut down since it was taken out of service Jan. 9 for a planned outage. Unit 3 was safely taken offline Jan. 31 after station operators detected a leak in a steam generator tube.
More information is available at www.edison.com/SONGSupdate and at www.SONGScommunity.com. San Onofre is jointly owned by SCE (78.21 percent), San Diego Gas & Electric (20 percent) and the city of Riverside (1.79 percent).
About Southern California Edison
An Edison International (NYSE:EIX) company, Southern California Edison is one of the nation’s largest electric utilities, serving a population of nearly 14 million via 4.9 million customer accounts in a 50,000-square-mile service area within Central, Coastal and Southern California.