Micronuclear and SMRs: What to Diligence

Vendors are pitching on-site nuclear to data centers, manufacturers, and remote sites. Here is how to tell a real project from a pitch deck before you sign anything.

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Daniel Burke

A companion to

Episode 21 · Micronuclear & SMR Explained: What You Need to Know

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Who this is for

■Facility executives at large data centers evaluating on-site baseload power
■Operations leaders at heavy manufacturing plants with process heat needs
■Energy decision-makers at remote industrial sites tired of diesel
■Critical infrastructure operators with constrained grid access
■Anyone being pitched an SMR or microreactor proposal right now

The real question

Should my facility invest in micronuclear or SMR technology for on-site power, and what are the real risks?

01 First principles Two categories, two different problems

SMRs and microreactors are two distinct product categories aimed at different operational problems. SMRs are generally 300 MW or less per unit, aimed at utilities and large industrial users. Microreactors are 20 MW or less, aimed at remote sites, off-grid loads, and facilities that need something compact and transportable. For context, conventional large nuclear runs from 550 MW to 1,500 MW per unit.

Sizing thresholds by unit class

The size class you evaluate determines the vendor list, the licensing pathway, and the use case.

35%of this guide, read. The rest of it is below.

02 The mechanism Four technology paths, four risk levels

Not all SMRs are the same technology. There are four main paths being pursued, and the more differentiated the design, the higher the technology readiness risk. That is a direct relationship.

Technology	What it is	Commercial readiness
Light water reactor	Scaled-down version of proven designs, standard low-enriched uranium fuel	Lowest technology risk, closest to commercial
High-temperature gas reactor	Graphite moderator, helium coolant, high-temperature process heat capable	Real capability, longer commercial timeline
Molten salt reactor	Molten salts as fuel and/or coolant, high-temperature operation	Earlier in development
Sodium-cooled reactor	Liquid sodium coolant, higher temperature and lower pressure	Efficiency gains with operational novelty

03 What it does to you The financial case is a manufacturing bet

The cost argument for SMRs is not primarily a nuclear argument, it is a manufacturing argument. Traditional large-scale nuclear plants are built on-site, unit by unit, at enormous capital cost. SMRs are being designed for factory fabrication and serial production, the same economic logic that made aerospace manufacturing scalable.

Rolls-Royce factory manufacturing benchmarks

90%

Manufacturing and assembly carried out in factory conditions

80%

UK supply chain contribution by value per SMR

470MW

Power station capacity per Rolls-Royce SMR

60years

Consistent baseload generation lifespan

These are targets and design intents, not audited throughput figures. Ask for actual factory output.

03 What it does to you The financial case is a manufacturing bet

The cost argument for SMRs is not primarily a nuclear argument, it is a manufacturing argument. Traditional large-scale nuclear plants are built on-site, unit by unit, at enormous capital cost. SMRs are being designed for factory fabrication and serial production, the same economic logic that made aerospace manufacturing scalable.

Rolls-Royce factory manufacturing benchmarks

90%

Manufacturing and assembly carried out in factory conditions

80%

UK supply chain contribution by value per SMR

470MW

Power station capacity per Rolls-Royce SMR

60years

Consistent baseload generation lifespan

These are targets and design intents, not audited throughput figures. Ask for actual factory output.

Diligence question

How much of your unit is actually being built in your factory today, and what is your unit-per-year throughput? A projection is not a factory floor.
A projection is not a factory floor.

Define

Economies of series: cost reductions from producing many identical units in a factory, versus economies of scale from building one very large unit on site.

The number

90%

Rolls-Royce targets roughly this share of manufacturing and assembly in factory conditions.

Ask them

Show me the factory. What is currently on the floor, and what is your delivered unit count to date?
04 The trap HALEU is the risk vendors will not volunteer
More than half of the SMR designs currently in development require high-assay low-enriched uranium, HALEU, which is uranium enriched between 5% and 20%. Standard reactor fuel today is enriched to under 5%. HALEU is not yet commercially available at scale in the West.

1 Only Russia and China currently produce HALEU at scale.

2 Centrus Energy began demonstration-scale U.S. production in October 2023. That is early-stage.

3 Transport containers for the volumes required do not yet exist at scale.

4 The supply chain requires significant capital and ongoing government support before private demand can carry it.

First question is not the reactor

If a vendor is pitching you an advanced reactor design that requires HALEU, your first question is not about the reactor. It is about the fuel. A stranded reactor is still a capital expenditure.
A stranded reactor is still a capital expenditure.

There is also the financeability question. Vendors state openly that nuclear must be financeable without long-term government intervention. At the same time, DOE reissued a tender worth 900 $M for SMR development in March 2025. Assess whether the vendor can survive the gap between subsidized deployment today and unsubsidized viability later.

Define

HALEU: High-Assay Low-Enriched Uranium. Enriched above conventional fuel but below weapons grade. Required by many advanced reactor designs.

The number

5%

Standard low-enriched uranium fuel sits below this enrichment level.

The number

900 $M

Active DOE tender for SMR development.

Ask them

What is your documented fuel supply plan for the first ten years of operation, and what is the contingency if HALEU supply slips?
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05 Your leverage Read the signals, ask the questions

Over 100 designs are in development. Most will not reach commercial scale. Watch the near-term deployment signals to see whether vendor timelines translate into operational reality: Rolls-Royce agreements in the UK, Sweden, and with CEZ Group; and the Oklo pilot at Eielson Air Force Base in Alaska, targeting 1 MW to 5 MW by 2,027.

Historical remote reactor vs. modern stationary nuclear

Vendor capacity factor projections for novel deployment models are unproven. Discount accordingly.

One historical benchmark: the MH-1A floating plant in the Panama Canal Zone in the late 1960s used 541 kg of uranium-235 over ten years and provided power for 9 years. That is one data point from a different era. But modern stationary nuclear achieves over 90%, and that track record does not yet exist for remote and transportable designs.

Staffing is a fixed line

Even the most automated microreactor designs require licensed operators on duty continuously. Project Pele's military spec called for a crew of 6 crew for a unit in the 1 MWe to 10 MWe range. Factor that in before you model the economics.
Even the most automated microreactor designs still require licensed operators on duty continuously.

The number

100 designs

Range of designs currently at various stages of development.

Ask them

What is your commercial deployment reference closest to my facility profile, and when does it commission?

The number

90%

Modern stationary nuclear capacity factor benchmark.

The number

6 crew

Project Pele crew size for a one to ten megawatt-electric unit.
Decision matrix

When to seriously evaluate on-site nuclear
✓ Worth a serious look

You run a genuine 24/7 baseload with constrained transmission access

You are a hyperscale data center evaluating multi-decade site power

You are a remote industrial or mining site currently burning diesel

You have a heavy manufacturing process that needs high-temperature heat, not just electricity

You can absorb a technology maturity bet and a fuel supply chain bet on the same project

✗ Not yet, or not for you

Your load profile is variable and you already have grid options

Your investment horizon is under a decade and you need firm commissioning dates

You cannot carry licensed operator staffing as a fixed cost line

The vendor's economics only work with sustained government subsidy

The design requires HALEU and the vendor has no documented fuel supply plan
Questions for your morning huddle

What is the technology maturity of this specific reactor design, light water or something more differentiated with a longer commercial runway?

Does this design require HALEU, and if so, what is the vendor's documented fuel supply plan?

What percentage of this unit is actually being assembled in a factory today, and what does the vendor's production rate look like?

Can this vendor reach financial close on our project without sustained government subsidy, and what happens if that support changes?
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Decision matrix

When to seriously evaluate on-site nuclear
✓ Worth a serious look

You run a genuine 24/7 baseload with constrained transmission access

You are a hyperscale data center evaluating multi-decade site power

You are a remote industrial or mining site currently burning diesel

You have a heavy manufacturing process that needs high-temperature heat, not just electricity

You can absorb a technology maturity bet and a fuel supply chain bet on the same project

✗ Not yet, or not for you

Your load profile is variable and you already have grid options

Your investment horizon is under a decade and you need firm commissioning dates

You cannot carry licensed operator staffing as a fixed cost line

The vendor's economics only work with sustained government subsidy

The design requires HALEU and the vendor has no documented fuel supply plan
Questions for your morning huddle

What is the technology maturity of this specific reactor design, light water or something more differentiated with a longer commercial runway?

Does this design require HALEU, and if so, what is the vendor's documented fuel supply plan?

What percentage of this unit is actually being assembled in a factory today, and what does the vendor's production rate look like?

Can this vendor reach financial close on our project without sustained government subsidy, and what happens if that support changes?
The one thing to remember

The SMR technology is real, the use cases are real, but the gap between real technology and your facility by your deadline is wide. You are making a technology maturity bet, a fuel supply bet, a vendor financeability bet, and a regulatory timeline bet all at once.

Before you sign anything, get written answers to the four huddle questions from the vendor. If any answer is a projection instead of a documented commitment, treat the project economics as unproven and price the risk into your model.
The Energy Decision Blueprint

Know if the numbers actually pencil out before you sign anything.

A written second opinion on the project in front of you, whether that is a rate change, new equipment, or a renewable installation.

01A short call, to figure out quickly whether we can actually be helpful. If we can't, we'll say so on the spot.
02We pull the data, your bills, your rate structure, vendor proposals, project specs.
03You get the verdict in writing: whether the payback will materialize, and the opportunities or risks nobody has raised.

Get a Blueprint at blueprint.tac-nrg.com Free for Indiana-based operations spending five figures or more a month on electricity. No obligation. You keep the write-up either way.
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