The 8 nuclear stories that mattered this week

Eight NNN nuclear stories published from September 20 through 26 capture a week of contrast: a fuel-loading interruption at a US restart, a consequential contractor split at an advanced-reactor project, and tangible commissioning, refurbishment and manufacturing progress elsewhere. Together, they show that the sector's next chapter will be measured not only by ambition, but by how projects handle execution, licensing and delivery.

Key facts

• Holtec paused fuel loading at Palisades after a previously used assembly tilted inside the reactor vessel; the company is developing retrieval equipment.
• Bechtel and TerraPower are moving separately on the Natrium project after failing to agree on its next phase; TerraPower says construction continues.
• Slovakia's 471-MW Mochovce 4 began generating power during staged commissioning, before grid synchronisation and commercial operation.
• Ontario awarded about C$3 billion in contracts as Pickering refurbishment construction began; major reactor work remains subject to regulatory approval.
• The IAEA's high case projects global nuclear capacity could reach 1,284 GWe by 2060, while the low case reaches 696 GWe.
• The week's other coverage tracked an AUKUS submarine-reactor production commitment, a second reactor completed for a planned floating plant, and Singapore's capability-building strategy.

1. Palisades fuel loading pauses after an assembly tilts

Holtec paused fuel loading at Palisades in Michigan after a previously used assembly tilted after placement in the reactor vessel. The operator says the handling-machine grapple had been disengaged and that engineers are developing equipment to retrieve the assembly; it has not provided a resumption date. The event adds work to a restart sequence already dependent on testing and regulatory approvals, without establishing from public information why the assembly tilted. Read NNN's report on the Palisades fuel-loading pause.

2. Bechtel and TerraPower separate on Natrium's next phase

Bechtel and TerraPower said they would move forward separately after failing to reach agreement on the next phase of the Natrium project in Wyoming. A Virginia WARN filing covers about 200 Bechtel positions in Reston, though the company said it expects few, if any, actual layoffs as it seeks to redeploy staff. TerraPower says work at Kemmerer is continuing with no anticipated schedule change; who assumes Bechtel's scope and how the transition affects delivery remain open questions. Read NNN's coverage of the Natrium contractor split.

3. Mochovce 4 enters power commissioning

Slovakia's 471-MW Mochovce 4 began generating power on September 21, moving into staged commissioning. The operator plans to raise output through test levels, synchronise the unit with the grid at 20% power, and complete a 144-hour full-power run before commercial operation. The milestone is real generation, but not yet routine service or a declared commercial start. Read NNN's Mochovce 4 commissioning update.

4. Pickering refurbishment moves into construction preparation

Ontario announced about C$3 billion in contracts as site construction began for the Pickering refurbishment. The package includes Unit 5 reactor-component work and turbine-generator upgrades; the broader programme is intended to refurbish four units, with reactor execution scheduled for 2027 subject to Canadian Nuclear Safety Commission approval. The contracts make the supply-chain scope more concrete, but they are only part of a much larger refurbishment and do not make the projected capacity available today. Read NNN's Pickering contract and schedule report.

5. IAEA raises its long-range nuclear capacity outlook

The IAEA's 46th annual estimates extend the outlook to 2060 and, for the sixth consecutive year, revise the projection upward. Its high case reaches 1,284 GWe by 2060, with small modular reactors modeled separately for the first time; the low case is 696 GWe. These are scenarios rather than a construction pipeline: financing, licensing, workforce capacity, lifetime extensions and retirements will determine how much of the projected growth materialises. Read NNN's analysis of the IAEA forecast.

6. Derby confirmed as the production centre for AUKUS submarine reactors

The UK Ministry of Defence's 2026 Defence Nuclear Enterprise update says Rolls-Royce Submarines' Raynesway site near Derby will build the next-generation reactors for all SSN-AUKUS submarines, including Australia's. Australia has committed £2.4 billion over ten years toward infrastructure and design costs. The commitment points to a long-duration naval-reactor manufacturing workload, distinct from civil nuclear deployment, and makes the capacity expansion at Raynesway a strategic supply-chain milestone. Read NNN's report on the Derby production commitment.

7. Second reactor manufactured for a planned Chukotka floating plant

Rosatom said its ZiO-Podolsk facility completed the second reactor unit for the PEB-106 floating power unit, intended to supply a copper-mining cluster in Russia's Chukotka region. The factory milestone advances equipment production, but the reactor still needs integration into the vessel, followed by commissioning; the plant is not operating. The project tests a distinctive approach to serving remote industrial demand, with shipyard integration and local infrastructure as important as reactor fabrication. Read NNN's report on the second reactor.

8. Singapore's nuclear discussion is building institutional capacity, not announcing a plant

NNN's Singapore analysis mapped the country's policy, finance and industry activity, while distinguishing capability-building from an approved power-plant project. Singapore is assessing nuclear energy and developing expertise in a system that relies heavily on imported natural gas; no decision to build a plant or selection of a reactor vendor follows from that preparation. The distinction matters for companies and investors reading exploratory studies and partnerships as possible commercial signals. Read NNN's Singapore nuclear-energy analysis.

What to watch next

At Palisades, watch for Holtec's retrieval method, any NRC action on the license amendment and a clear account of when fuel loading can resume. At Natrium, the key evidence will be a documented transition of Bechtel's responsibilities and project updates that test the schedule claim. Mochovce 4 still has grid synchronisation and power-ascension tests ahead, while Pickering's licensing milestones precede major reactor work. Across the longer-range stories, the test is conversion: forecasts into funded projects, factory milestones into commissioned plants, and strategic commitments into delivered capability.