MHI Delivers First 3 Steam Generators for EDF’s Cruas 2 Reactor

Mitsubishi Heavy Industries (MHI) has delivered three replacement steam generators, each about 21 metres tall and 330 tonnes, to EDF for the 900 MWe Cruas 2 reactor in France, the company reported on 15 October 2026. They are only the first three of nine ordered.

A steam generator replacement at a 1980s-vintage reactor sounds like routine maintenance. It is actually a physical sign that France is spending real capital to run its reactors well past 40 years, and every year a reactor keeps running is another year of fuel demand.

Here is what the delivery signals about the life-extension spending cycle, and where it fits in the uranium demand picture.

Why a nine-unit order is the real story behind one delivery

Cruas 2 is a pressurised-water reactor (PWR), a design that uses water under high pressure to carry heat from the core, in France’s Ardèche region. EDF placed the order in 2019 after an international tender, which MHI won with French partner Onet Technologies.

The timeline shows how slow this work is.

Each unit carries the following specifications:

• Height of about 21 m and weight of about 330 tonnes
• More than 4,500 TT690 heat-transfer tubes
• A pressure vessel of high-strength low-alloy steel

More than two years passed between finishing fabrication and reaching France. That gap tells you this is long-cycle industrial work, so news like this confirms spending already committed rather than signalling sudden new demand. MHI is also a repeat supplier, having shipped about 31 replacement units to France, Belgium and the USA by January 2024, including 15 to EDF and three for Cruas 1.

What the TT690 tubes change

TT690 is thermally treated Alloy 690, with about 30% chromium versus roughly 15% in older Alloy 600, giving much better corrosion resistance. Mill-annealed Alloy 600 tubing drove earlier replacement campaigns, and ASN reported that EDF finished swapping the most vulnerable units across about 26 reactors in 2015.

Why French reactors are getting new steam generators at 40 years and beyond

Forty years sounds like a retirement date. In France it is closer to an exam.

Continued operation is approved reactor by reactor through periodic safety reviews, not a blanket licence. The fleet is already deep into that process:

• EDF runs 32 reactors of 900 MWe and 20 of 1,300 MWe
• By end 2025, 25 of the 32 smaller units had started or completed fourth ten-yearly outages
• On 1 January 2026, ASNR reported 25 of 56 operating reactors (excluding the Flamanville EPR) had passed 40 years
• Paluel 1 began the first 1,300 MWe fourth ten-yearly outage in January 2026, after ASNR’s July 2025 position on running those units to 50 years

The review gate French regulators treat 40 years as the trigger for a particularly demanding review of plant condition, ageing and required modifications, not as an automatic shutdown.

What Grand Carénage costs

Steam generators are one of the largest items in Grand Carénage, EDF’s programme for safety upgrades and ageing equipment. Phase two is put at €36.3 billion, including stress-corrosion-cracking repairs, with €5 billion spent in 2025. Separately, about €6 billion is planned for extending the 1,300 MWe units, and reviews are expected to run to about 2034.

The approval is conditional: EDF must complete prescribed modifications and prove compliance at every unit. For you as an investor, that means timelines and costs can shift unit by unit, so treat the headline figure as a planning floor, not a guaranteed outcome.

Cost outcomes can differ sharply by approach, and aligning capital modifications with scheduled maintenance outages helped one US utility cut an uprate budget by hundreds of millions without reducing scope.

What life extension and supply-chain pressure mean for uranium demand

Reactors that keep running keep consuming reload fuel. That tightens uranium markets sooner than reactors still under construction.

The long-term premium over spot tells you utilities are paying for security of supply. The World Nuclear Association‘s September 2026 outlook estimates 401 GWe of about 423 GWe could stay online to 2050, with requirements rising from about 68,920 tU (tonnes of uranium) in 2025 to over 150,000 tU by 2040 in its reference case. The IAEA projects 90,000-142,000 tU a year by 2050.

There is a nuance. Extended reactors have finite remaining life, while new build adds decades of demand, so you should treat extension as one support for uranium, not the sole driver.

Where the risks sit

The near-term risks are operational:

• Regulatory delay at certification or review hold points
• Long outages for lifting, welding and testing
• Cost growth when inspections find new ageing issues
• Alloy 690 still needing inspection and water-chemistry control
• Supply-chain congestion and political shifts

The last item is structural. EDF’s use of MHI shows heavy-component capacity is shared across life extension, EPR2 construction and export projects, and the same factories and workers can only stretch so far.

France is pursuing EPR2 construction alongside fleet life extension, and the two programmes compete for the same specialist manufacturing and skilled labour.

What this delivery confirms, and what still needs to happen

The shipment confirms a funded, regulator-supervised nine-unit programme, with six generators still to come from 2028. It does not, by itself, change the demand outlook.

The next markers are installation progress at Cruas 2, further fourth periodic reviews through about 2034, and the later deliveries from Kobe. Extension supports uranium demand, but the benefit depends on execution, so delivery milestones and regulatory outcomes will tell you more than headlines.

For readers wanting the bigger picture, our deep-dive into nuclear capacity tripling weighs the investment challenges of reaching 2050 targets.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors.