A large assembly of nuclear fuel rods tipped over during installation inside the reactor vessel at the Palisades Nuclear Power Plant in West Michigan in late August, halting the refueling process and triggering a federal investigation that only became public weeks later. The mishap has paused fuel loading in the unprecedented effort to bring the shuttered plant back online, while other restart activities continued. The fuel assembly remains inside the reactor pending a specialized retrieval plan.
The incident occurred on August 30, 2026, as Palisades entered what's known as Mode 6 refueling to load 204 fuel assemblies into the reactor core, according to Nuclear News. Loading was halted after a previously used fuel assembly tilted from its upright position after being placed and disengaged from the fuel-handling machine grapple, the outlet reported. The U.S. Nuclear Regulatory Commission is now investigating the incident, and Palisades plant operator Holtec is seeking a license amendment from the federal regulator so it can retrieve the tipped assembly from within the reactor vessel, according to the Detroit Free Press.
Holtec, which is based in Camden, New Jersey, and NRC officials released no public information about the incident for weeks after it happened, the Free Press reported. NRC spokesperson Viktoria Mitlyng said on September 24 that the tipped fuel assembly did not meet reporting requirements to the NRC, and the fuel assembly was not dropped, according to the same report.
A Rare Mechanical Failure
Former Palisades engineering director Alan Blind said nuclear fuel assemblies are engineered with multiple anti-tilt safety features, making a tilt extremely rare over his 40-year nuclear career, according to News Channel 3 WWMT. His comments point to a significant mechanical or handling failure behind the mishap, and the tipped assembly has remained resting inside the reactor vessel pending extraction, the station reported.
A root-cause evaluation has been initiated, and specialized, custom retrieval tools are being designed to lift the tilted fuel assembly out of the reactor core. Once removed, the assembly would be transferred back to the facility's spent fuel pool. But operators cannot execute that retrieval until the NRC approves the license amendment request detailing the proposed methodology and specialized equipment, per Nuclear News.
Until that approval comes through, the fuel handling pause prevents Palisades from advancing to Mode 5 cold shutdown. Restart activities independent of fuel loading have continued, including the plant's reconnection to the switchyard on September 11, Nuclear News reported.
Disclosure Timing Draws Scrutiny
Just days before acknowledging the fuel assembly incident publicly in September, Holtec postponed a planned initial public offering on Nasdaq for its nuclear business unit, drawing criticism from nuclear oversight advocates over corporate disclosure practices, according to The National News. The advocacy group Don't Waste Michigan has publicly questioned the alignment between the IPO delay and the timing of the incident report, the outlet noted.
An Unprecedented Restart Attempt
The stakes riding on the fuel assembly mishap trace back to August 2025, when the NRC reauthorized Palisades to transition from decommissioning back to active operational status — marking the first time in U.S. history a retired commercial nuclear plant was permitted to reload reactor fuel, per Holtec International. The plant, owned by Holtec, had originally ceased power generation in May 2022 under previous owner Entergy after operating for more than 50 years.
The federal government has a substantial financial stake in the project's success. In September 2024, the U.S. Department of Energy finalized a $1.52 billion loan guarantee to back Holtec's restoration and repowering of the 800-megawatt facility in Covert Township, according to the U.S. Department of Energy. By August 2025, the agency had disbursed more than $335 million across five installments as Holtec met sequential regulatory and restoration milestones, the department said.
Returning the 800-megawatt plant to service is projected to support or retain up to 600 Michigan jobs and support more than 1,000 jobs during regularly scheduled refueling and maintenance periods every 18 months, as well as contribute to MISO's baseload resources, per the Department of Energy. Those projections underscore how much is riding on a fuel handling process currently paused while federal regulators weigh Holtec's retrieval plan.
