Holtec submits key nuclear safety report to NRC, advancing construction permit for two SMR-300 reactors at Palisades, Michigan
On September 30, 2026, Holtec International’s Corporate Engineering unit submitted a Preliminary Safety Analysis Report to the US Nuclear Regulatory Commission. That filing completed the second phase of its Construction Permit Application for two planned SMR-300 small modular reactors at the Palisades site in Covert Township, Michigan.
The filing covers Pioneer 1 and Pioneer 2 — twin units designed to add 680 megawatts of generating capacity. Holtec calls it the most significant regulatory step taken so far toward building what could become the industry’s first SMR-300 plant.
Holtec files PSAR with NRC, completing second CPA phase
The PSAR doesn’t stand alone. It follows the Limited Work Authorization application and Environmental Report that Holtec submitted in December 2025 — the first phase of the Construction Permit Application process — and together these filings build the regulatory record the NRC needs to decide whether construction can move forward.
Validated through testing at Purdue University, the approach could significantly reduce labor requirements compared with conventional construction.
The report delivers detailed technical and safety information specific to the Palisades site, where Pioneer 1 and Pioneer 2 would go up, each contributing to a combined 680-megawatt output. That capacity would add meaningful clean baseload power to the regional grid.
Before submitting, Holtec held numerous pre-submittal engagement meetings with NRC staff. Ongoing regulatory dialogue like this is standard for complex nuclear applications, helping both sides work through technical questions well before a formal filing lands on the commission’s desk.
Years of R&D and regulatory engagement underpin the application
Holtec’s SMR program didn’t start recently. It launched in March 2011 — meaning the team has spent well over a decade on research, design refinement, testing, and regulatory interaction before reaching this point.
The development effort spans multiple countries. Teams in the United States, United Kingdom, Spain, Ukraine, and India — the last operating under Part 810 authorization — have all contributed to the technical foundation behind the PSAR. Holtec describes the program’s current pace using the Latin phrase Grandis Ferocious: gradual and methodical at first, then ferocious.
Holtec frames the PSAR as the most significant regulatory step taken to date for the Pioneer plant — a characterization that reflects just how much groundwork had to be laid before a filing this complex could be made.
Three licensing topical reports recently accepted by the NRC
Several parallel regulatory tracks have been advancing alongside the PSAR — and producing results. Three Licensing Topical Reports have recently been audited and accepted by the NRC, each covering a distinct technical area.
The first covers a novel civil construction method using shop-fabricated modules. Validated through testing at Purdue University, the approach could significantly reduce labor requirements compared with conventional construction. The NRC audited and accepted the associated report in September 2026, with a Safety Evaluation Report expected by early November 2026.
The second topical report addresses soil-structure interaction — specifically, an innovative methodology for predicting how a plant responds to seismic activity across different soil conditions. The NRC accepted this one in September 2026 as well, with a Safety Evaluation Report anticipated by the end of October 2026. Holtec says the method could support deploying a standard SMR-300 design across a wide range of sites worldwide.
The third covers an innovative instrumentation and control architecture. Accepted by the NRC in August 2026, official regulatory approval is expected in October 2026.
Progress on the first phase of the Construction Permit Application is also moving. The NRC closed its audit of the Limited Work Authorization application in September 2026, and the agency’s draft Safety Evaluation Report for that phase is anticipated in December 2026.
Pioneer plant to anchor expanded Palisades Energy Campus
The Pioneer units aren’t planned in isolation. They’re part of a broader Palisades Energy Campus, anchored by the existing 805-megawatt Palisades plant, which is currently in the final stages before repowering. Adding two SMR-300 units would significantly expand the site’s generating footprint.
The SMR-300 design includes several features aimed at compactness and safety — among them subterranean on-site storage for used fuel, designed for indefinite duration, and the elimination of a traditional exclusion zone around the plant. Holtec points to those attributes as evidence of the reactor’s radiation containment capabilities, and the design also targets a reduced land footprint compared with conventional nuclear plants.
The US Department of Energy is providing financial support to help accelerate the Pioneer deployment program. Holtec acknowledged that backing in its announcement, alongside the NRC’s “risk-informed regulatory posture” and the responsiveness of the commission’s staff.
What comes next for Pioneer 1 and Pioneer 2
With the PSAR filed, Holtec’s near-term agenda covers several fronts: completing a Class 2 construction cost estimate, producing a 4D simulation of the entire plant — a step-by-step visual model of how construction would unfold — and finishing the confirmatory safety analyses needed to support the plant’s Final Safety Analysis Report, which comes later in the licensing process.
The NRC’s review of the PSAR will take time. The Safety Evaluation Reports for the three accepted topical reports are expected to arrive on a rolling basis through late 2026, keeping the regulatory calendar active in the interim.
If the Construction Permit Application clears the NRC’s review, Pioneer 1 and Pioneer 2 would be the first SMR-300 units built anywhere — a milestone Holtec International has been working toward for more than fifteen years.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
