Edison Maintains San Onofre Waste Safety Amid Flooding
The San Onofre Nuclear Generating Station remains secure as coastal flood advisories impact Southern California.
Updated on Oct. 30, 2026 in Nuclear
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Southern California Edison is monitoring the safety of nuclear waste storage canisters at the San Onofre Nuclear Generating Station during a period of coastal flooding. The site houses millions of pounds of spent fuel behind protective seawalls.
Why it matters
The security of nuclear waste is a critical concern in California as the federal government has not established a permanent disposal site for spent nuclear fuel. Facilities must rely on interim storage solutions while facing increasing environmental risks.
The San Onofre facility contains 73 vertical and 50 horizontal storage canisters, protected by a 28-foot seawall and designed to withstand 50 feet of submergence. Engineering teams annually review sea level rise assessments to confirm these design tolerances.
The players
Southern California Edison
This electric utility company operates the San Onofre Nuclear Generating Station and manages the storage of spent nuclear fuel at the site.
National Weather Service
This federal agency provides weather forecasts and hazard warnings, including the current Coastal Flood Advisory for the California coast.
The details
The plant stores 3.55 million pounds of radioactive spent fuel just 100 feet from the Pacific Ocean. While 54 of the 66 original structures have been removed, Southern California Edison continues to manage the remaining waste on-site.
Timeline
2010: Federal funding for the Yucca Mountain waste site was cut.
2012: A steam generator leak occurred, leading to the plant's permanent closure.
October 30, 2026: The current Coastal Flood Advisory for San Diego and Orange counties expires at noon.
Early 2027: Exterior demolition of the containment domes is expected to begin.
The Big Picture
The situation at San Onofre follows a pattern set by the Nuclear Waste Policy Act, which mandated a national strategy for permanent waste disposal that remains unfulfilled. This status leaves local sites to manage millions of pounds of radioactive material indefinitely.
Local residents near the coast can monitor official safety advisories during the current flood warning to understand potential road impacts near the facility. The ongoing presence of stored waste continues to influence long-term regional planning and decommissioning schedules.
The takeaway
While the facility is engineered to withstand extreme coastal conditions, the accumulation of waste on-site remains a temporary solution. Residents should remain aware of local weather alerts while the decommissioning process continues over the coming years.
What happens next
Exterior demolition of the containment domes at the San Onofre site is expected to begin in early 2027.
Further reading
For more information on regional developments, visit the Nuclear section.
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