REGION — Southern California Edison and a leading nuclear waste expert have called two recently published reports describing “fatally flawed” conditions at a decommissioning nuclear waste storage facility “untrue and misleading.”
One of two reports examining the decommissioning San Onofre Nuclear Generating Station (SONGS) published by the Samuel Lawrence Foundation examined damage caused to the steel canisters as they are lowered into dry storage vaults and how sea-level rise could lead to water getting into the vaults.
The reports estimated that a major release of radiation from the site could cost Southern California as much as $13.4 trillion over a 50-year period and endanger millions of residents who live near the San Onofre site, located on the coastline between Oceanside and San Clemente.
The nonprofit organization used economic impact modeling software to estimate economic losses from diminished activities that would stem from a potential radiation-spreading incident within evacuation zones of one, 10 or 50 miles over one to 50 years.
Southern California Edison and SONGS released a response to the reports, calling the $13.4 trillion figure “misleading” and stressing that there is “zero possibility” of a radiological catastrophe that would affect anything outside of the plant’s boundaries.
No accident mechanism
The Samuel Lawrence Foundation reports frequently refer to the 2011 Fukushima Daiichi nuclear disaster in Japan, suggesting a similar incident could happen with San Onofre.
The big difference between the two, according to SONGS officials, is that Fukushima was operating at the time of that accident while San Onofre is no longer an operating reactor site.
Victor Dricks, senior public affairs officer for the U.S. Nuclear Regulatory Commission Region IV, told The Coast News “it’s inappropriate for the study to refer to operating reactor planning zones.”
“No credible accident mechanism exists for radioactive material to leave the San Onofre site, given how much the spent fuel has cooled off since the reactors were shut down for the last time,” Dricks said via email. “This means there is no basis for examining potential economic effects of an accident beyond the site boundary, never mind out to 10 or 50 miles.”
SONGS closed in 2012 after continuous leaks were discovered in the plant’s steam generator tubes.
Dricks explained that when a nuclear plant shuts down permanently, the owner lays out a case for why the Nuclear Regulatory Commission’s emergency preparedness requirements, including the 10- and 50-mile zones, should no longer apply.
Southern California Edison did this in March 2014, and commission staff reviewed its request and asked for permission to exempt San Onofre from those requirements.
Nuclear Regulatory Commission approved the exemptions in March 2015.
For the last several months, downloading of the canisters into the dry storage vault has been stopped after an incident on Aug. 3, 2018, when a full canister containing spent fuel became stuck 18 feet in the air during the downloading process.
Investigations revealed the operators and managers could not see the canister as it was being lowered and became stuck.
According to the Samuel Lawrence Foundation research, had the canister fallen it could have hit the facility floor with “explosive energy greater than that of several large sticks of dynamite” and could have caused a large radiation release and ruined the facility’s cooling system.
If the cooling system had been blocked, according to the report, great quantities of water would be needed to cool the reaction and prevent or control a meltdown.
“One key point is how long it would take for the plant’s spent fuel in the pools to start overheating if all water was lost… as of 2016, the plant would have more than a day to get more water into the pool before fuel damage might occur,” Dricks explained. “SCE’s resources and procedures can get additional water into the pool in less than 2 hours.”
Because the fuel is always losing heat, there’s now even more time to get water into the pool if something happens, according to Dricks.
“Fuel that’s been loaded in casks has cooled off to the point that simple air flow past the walls of a cask is enough to safely remove the residual heat, so that fuel would remain safe for an extended period even if a cask was somehow damaged to the point of restricting air flow,” Dricks said.
Fukushima’s fuel was extremely hot and couldn’t be cooled, according to the SONGS response, unlike the spent fuel at San Onofre.
Tom Palmisano, SONGS vice president of external engagement, said the canister would have posed “no risk” to workers or the public had it fallen because of the canisters’ durability.
“It’s designed to be capable of dropping 25 feet and not breaching,” he said.
The Samuel Lawrence Foundation report questions the durability of the canisters by using documentation for completely different canisters, according to the SONGS response.
SONGS uses a Holtec UMAX system with MPC-37 casks, according to the response, noting that the reports cite a safety analysis report for the Hi-Storm 100 Cask System.
The SONGS response also questions the Samuel Lawrence Foundation reports’ usage of the word “gouge” to describe scratches that develop along the outside of the canister as it connects with a shield ring during its downloading.
According to an analysis from Southern California Edison, the Samuel Lawrence Foundation report errs in assuming that the full weight of the canister can be applied laterally to scratch the canister — only 2 percent of the weight can be applied.
Additionally, the canisters’ stainless steel has a protective film that allows scratches to repair themselves “in a non-corrosive environment like ambient air, and at the warmer temperatures seen for a loaded MPC.”
The same report also discusses sea level rise as a possible issue, but the SONGS response points out that Southern California Edison took sea level rise into consideration as well.
“Should the ground water rise, the reinforced concrete monolith (3’ thick) and stainless steel liner of the cavity enclosure container will prevent the canisters from becoming wet,” the SONGS response states. “Even so, the canisters are qualified for full submergence, but SCE would take action long before being submerged.”
The response also notes that Southern California Edison would still have time to relocate the storage facility even under the “extremely pessimistic projections” for sea level rise that Samuel Lawrence Foundation uses in its report.
As previously stated, downloading of any more canisters of spent fuel have stopped since the Aug. 3 incident.
The Nuclear Regulatory Commission launched an investigation into the incident and found two apparent violations during an inspection between Sept. 10 and Sept. 14, 2018, which were the failure to ensure “important-to-safety” equipment was available to provide more drop protection and to make a timely notification to the Nuclear Regulatory Commission about the Aug. 3 incident.
Palmisano said that even though there was no risk to the workers or public had the canister dropped, that fact alone wasn’t good enough to allow downloading operations to continue as they were.
He said Southern California Edison has implemented improved procedures, training and technology to use when downloading the canisters.
Dricks confirmed that the downloading operations remains on hold until Southern California Edison has demonstrated that fuel transfer could continue using its improved procedures, training and technology.
The Nuclear Regulatory Commission will need to inspect the changes before it can be determined if SONGS is ready to start transferring spent fuel into dry storage again, which Palmisano is expecting to happen in the next several weeks.
Wrong and reckless
Southern California Edison and SONGS are not the only ones who think the Samuel Lawrence Foundation reports are full of false and misleading information.
James Conca, a world-leading expert in nuclear waste who resides in Washington state, said the reports got “pretty much everything” wrong.
Conca explained that spent fuel is taken out of a nuclear reactor after six years and put into a pool of water before it’s put into dry storage. By the time it’s in dry storage, the spent fuel “has the solubility of rock,” and is virtually impossible to spread.
“There’s no geological mechanism to spread spent fuel anywhere,” he said.
David Victor, chairman of the Community Engagement Panel on the decommissioning of SONGS, an independent group from Southern California Edison and SONGS, said both reports were “fundamentally wrong” and that Samuel Lawrence Foundation displayed a “reckless disregard for reality” by pushing the reports out to the public.
Victor said the economic analysis team that examined the potential economic effects detailed in one Samuel Lawrence Foundation report were asked to assume what would happen if an event like Chernobyl or Fukushima were to happen at San Onofre in their analyses, and did so without asking if that assumption was even possible.
“That completely invalidates the study in my view,” he said.
Conca and Victor said reports like the two from the Samuel Lawrence Foundation create “fear-mongering” that ends up delaying moving spent fuel out of California and into facilities in New Mexico or West Texas.