Don’t fast-track Diablo Canyon license renewal

December 16, 2022

Opinion by San Luis Obispo Mothers for Peace

On Dec. 6, in their second letter to the Commissioners of the U.S. Nuclear Regulatory Commission (NRC) within the space of three weeks, four environmental organizations once again put the NRC on notice that the agency would violate federal law if it accepted Pacific Gas & Electric’s Oct. 31 proposal to resurrect and fast-track its review of PG&E’s long-abandoned 2009 license renewal application for the twin Diablo Canyon reactors.

San Luis Obispo Mothers for Peace (SLOFMP), Friends of the Earth (FOE), Environmental Working Group (EWG), and Committee to Bridge the Gap (CBG) warned that PG&E’s proposal runs afoul of the NRC’s safety requirements and procedures and would violate the federal National Environmental Policy Act. The NRC terminated the Diablo Canyon license renewal proceeding in 2018 when PG&E decided to close the reactors in 2024 and 2025.

‘PG&E cannot have it both ways,’ claimed SLOMFP Board President Jane Swanson. ‘PG&E stopped preparing the reactors for continued operation in 2016 and asked the NRC to terminate the license renewal proceeding. The company has spent the past six years preparing to mothball the reactors and has saved money by not investing in future operations. They can’t reverse course and revive a license renewal application that was declared dead years ago at their own request.’

Last September, the California Legislature passed SB 846 to provide PG&E with economic incentives to request a five-year extension of Diablo Canyon’s license from the NRC.

‘With years of extended operations on the table for this outdated and potentially deadly nuclear facility, it is crucial that we cut zero corners,’ said FOE Legal Director Hallie Templeton. ‘The California legislature has not provided PG&E carte blanche to seek exemptions and streamline relicensing. If it intends to continue operating Diablo, PG&E should be required to file an entirely new and up-to-date license renewal application, which the NRC must thoroughly analyze by the full letter of the law before reaching a decision.’

The organizations also noted that PG&E had no legal basis for its request to exempt it from important federal regulations requiring an environmental analysis before the NRC can allow the reactors to operate beyond their current license terms.

‘The last time the NRC did an environmental review for operation of the Diablo Canyon reactors was 1993,’ said Ken Cook, EWG’s President and Co-founder. ‘Given the potentially extreme impacts and risks of continuing to operate Diablo Canyon, it would be both illegal and sheer folly to proceed with extended operation in the absence of a thorough and up-to-date Environmental Impact Statement.’

Dan Hirsch, spokesperson for CBG, commented, ‘PG&E’s request to be exempted from regulatory requirements for Diablo Canyon is very dangerous. If the requested exemption were granted, Diablo could keep running, potentially for many years, while the critical issues of whether it is safe to do so are not yet resolved. This creates the potential for an accident and massive radiation release to occur after license expiration and before a renewal decision could be made on those vital safety issues. It is the proverbial nuclear version of shooting first and asking questions later.’

These groups, which submitted their first letter to the NRC on Nov. 17, pledged to continue their efforts to ensure that any license renewal application filed with the NRC by PG&E is reviewed with all the rigor required by federal safety and environmental laws.


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Sure, take as long as necessary so long as there is no intervener funding allowed. We pay for that too while the squeaky wheels get funded (pay day) just because they complain and the benefit with that s a safer project.


The French almost won The World Cup. Runners Up they were. As to Nuclear power, they are world class and we in America should follow their example.


The nuclear power plant at Diablo Canyon is old outmoded, inefficient technology that taxpayers are being asked to subsidize well beyond what is rational or in the best interest of the general public. If we’re going to spend massive amounts of money, we should be spending it on modern efficient nuclear power plants that do not generate the massive amounts of toxic radioactive waste as you will find at Diablo Canyon, where millions of pounds of it are being stored in vulnerable temporary facilities at risk from terrorists and natural disasters. The crucial cooling system at Diablo Canaan is at sea level and below, and is extremely vulnerable to tsunami’s. The plant sits on a very vulnerable and active set of earthquake faults, and yet, even after an upgrade, the plant is only rated to withstand up to a 6.8 earthquake.

There is a reason they call that plant “the old Lady of the canyon.” she’s more than half a century old, conceived before most of the people reading this were even born. Do we expect firefighters, police, officers, and soldiers to use half century old equipment when their lives depend on it? but it’s OK with a nuclear reactor?


As a long time PG&E employee and Diablo Canyon Mechanical Engineer who has followed the Mothers for Peace for many years I have come to believe that they have no credibility. How long does DCPP have to operate before the Mothers are convinced that their fears of a nuclear catastrophe are overblown? I will be the first to admit that risks are involved with civilian nuclear power. Risks are part of everyday life. Risk mitigation is part of the culture at DCPP. Engagement rather than alienation caused by rigid opinions would be much more productive.

Ken Palmer