The programme to restart the Palisades nuclear power plant in Michigan is now in the inspections and maintenance phase and remains on schedule, Holtec International said in its latest update. Meanwhile, the US regulator has been petitioned to codify regulations for restarting shuttered nuclear power plants.

The programme to restart the Palisades nuclear power plant in Michigan is now in the inspections and maintenance phase and remains on schedule, Holtec International said in its latest update. Meanwhile, the US regulator has been petitioned to codify regulations for restarting shuttered nuclear power plants.

Recent progress at the plant, in Covert Township, has included initial accreditation for Holtec’s operations and maintenance and technical training programmes, requalification of 26 former Palisades licensed operators, significant workforce growth, completion of chemical cleaning of the primary coolant system , and comprehensive reactor vessel internal inspections. The chemical cleaning has “had a dramatic effect on further improving the plant’s occupational radiation safety metrics”, Holtec said.

The focus has now shifted to detailed inspections and maintenance of major systems, including the main turbine, containment building structure, high-voltage towers and transformers. Detailed inspections of the plant’s steam generators have been completed, during which the need for additional maintenance activities was identified, Holtec said: “Thorough and early inspections have allowed us to proactively identify and implement the needed refurbishments before Palisades returns to service. Palisades’s owner’s engineer, Nuclear Consultants International (NCI, an autonomous Holtec affiliate), is working with experienced on-site and external experts to devise and implement industry-proven solutions.”

Preparations are also nearly complete for a five-month campaign to transfer used fuel assemblies currently stored in the plant’s fuel pool to Hi-Storm FW dry fuel storage systems at a unified on-site storage facility, designed and built by Holtec’s Nuclear Power Division.

“As nuclear professionals, restoring the plant to its highest level of safety is our utmost priority. Our primary focus remains ensuring that Palisades returns to service safely and reliably, with all necessary repairs and maintenance completed to the highest standards,” said Holtec Chief Nuclear Officer Rich Burroni.

Palisades’ single-unit 800 MWe pressurised water reactor was shut down in 2022, after more than 40 years of commercial operation, and was to be decommissioned. Holtec completed its acquisition of the reactor from then-owner and operator Entergy shortly after the reactor’s closure, with plans to finish dismantling, decontamination, and remediation by 2041. The same month, the US Nuclear Regulatory Commission (NRC) transferred the plant’s operating licence to Holtec for the purpose of decommissioning.

But Holtec then announced plans to apply for federal funding to enable it to reopen the plant, and in October 2023 submitted a filing with the NRC to formally begin the process of seeking reauthorisation of power operations at the plant. The company is aiming to repower the plant by the end of 2025. It would be the first nuclear power plant in the USA to return to commercial operations after being closed down, and current plans would see it provide baseload clean power until at least 2051.

Regulatory process

According to NRC information, Holtec will need to explain to the regulator how it will return plant components to a status that supports safe operation; restore the licensing basis of the plant to an operational status, and make any upgrades necessary to meet current NRC requirements. NRC staff will carefully review the regulatory and licensing documents for the plant, inspect new and restored components necessary to operate safely, and continue ongoing oversight to ensure sufficiency of all plant systems and programmes. The NRC has established the Palisades Nuclear Plant Restart Panel to provide oversight of the restart effort.

Palisades may not be the only shuttered US plant to return to service: earlier this year, NextEra Energy CEO John Ketchum told investors the company was considering the possibility of restarting the Duane Arnold boiling water reactor plant, which closed in 2020. Constellation Energy CEO Joe Dominguez has also, in comments to investors, not ruled out a restart of Three Mile Island unit 1 which closed in 2019.

Now, the US regulator has been petitioned to revise its regulations to include a Commission-approved process for returning a decommissioning plant to operational status. In an entry in the US Federal Register, the NRC said it has determined that the petition “meets the sufficiency requirements” for it to be documented, and is calling for public comment. The petition was submitted by a former engineering director of the plant and an investigative journalist, with community members near the plant adding their signatures.

“The petition states that the NRC staff lack a specific NRC Commission-approved and codified process for licensing, inspecting, and approving the return to service of a power reactor that has entered decommissioning. The petitioner requests that the NRC conduct rulemaking to include a codified process for returning a decommissioning plant to operational status,” the NRC said.

The review of the petition is a separate process from the ongoing NRC consideration of requested actions related to the potential restart of the Palisades Nuclear Plant, the regulator added.