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The Traction of Small Reactors

The New York Times’ Matt Wald provides a nicely reported history and the state-of-play in the small reactor world. Just as the first domestic nuclear reactors were scaled up versions of small reactors, current versions of the tiny titans are scaled down versions of full-scale reactors (actually, some of them are – some are based on new ideas entirely).

“They offer the potential for a new paradigm in how we think about construction of nuclear power plants,” Peter B. Lyons, the Energy Department’s assistant secretary for nuclear energy, said of the so-called small modular reactors, also known as S.M.R.’s. He is supervising a program under which the government will pay up to half of the development cost of two different models. One manufacturer already has a contract to develop a plan for two small reactors in Tennessee.

That manufacturer would be Babcock&Wilcox, teamed with Bechtel and the Tennessee Valley Authority (interesting B&W video on this page).

Wald also provides some interesting details about the B&W mPower reactor, which makes clear that small doesn’t mean pee-wee.

Babcock’s reactor, 13 feet in diameter and 83 feet high, can produce 180 megawatts of power, about 15 percent of the power of a large new reactor, but can run far longer before refueling is required: four years, the manufacturer says, versus one to two years for a standard reactor. When a utility company needs more power, it can order another. Babcock refers to the basic design as a “two-pack,” as if the reactors were twin boxes of laundry soap.

The reactor’s emergency cooling system consists of the natural circulation of air. Conventional reactors require operators to start up pumps and align valves, something that was impossible in the Fukushima accident, when a tsunami wiped out electric power.

There’s a fact sheet about the mPower reactor here. And the Generation mPower site that it comes from is a treasure trove of information.

Some aspects of the article are speculative in nature:

And the regulatory structure is not so great for small reactors. Regulatory commission rules for control-room staff levels, emergency planning zones and security are all predicated on large, aboveground reactors. A small one built mostly underground might logically have smaller requirements, but a potential buyer would be reluctant to build one under the current regulatory regime, experts say.

Wald’s right – these are logical assumptions – but still largely unknown until the NRC finalizes its process for small reactors.

Amusing sentence:

But new approaches to nuclear power have been forecast far more often than they have been realized, and some worry that small modular reactors could fall into that category.

First, because what large industry doesn’t forecast more than it realizes – I want my hover car and now! – and second, small reactors seem to have really moved out of that category. Yes, they’re still at an early stage, but they have gained a good deal of traction and traction can carry a process a long way.

Very interesting and highly readable article. Well worth a look.


Anonymous said…
How viable are small reactors given the existing license fee structure? Would each reactor require its own license at the current going rate? How would that undercut plant economics? I can see that being a barrier to deployment if each small reactor has to pay the same fee as a 1200 MWe unit. If a utility wanted to put eight SMRs on one site, would they get dinged for eight separate license fees?
It should be Federally mandated by Congress that 90% of all electricity produced by a utility in the US should come from carbon neutral resources by 2030 (50% by 2020).

Utilities would have a variety of options to meet the Congressional mandate (nuclear, wind, solar, biomwaste, etc.)

A 15% sin tax should be charged on all electricity produced by any US utility that fails to reach these mandated levels.

Marcel F. Williams
Anonymous said…
NRC and industry are still working on how modules and other SMR licensing issues would be handled. But reactor licensing and regulatory costs are not nearly high enough to make or break an SMR project, even if the modules were treated as separate reactors.
gmax137 said…
The annual license fee is $4,766,000 for a power reactor (see 10CFR171.15(b)(1)). For the 180MWe B&W unit that's 0.3 cents/kw-hr minimum (assuming it ran 24x7x365). That's a substantial operational cost given the margins. Compare to 0.05 cents/kw-hr for the 1200 MWe unit. Or, consider that 4.8 million could payroll a staff of 40+ employees.
Anonymous said…
Remember that it's not just the annual licensing fee that drags you down. You need overhead to maintain those licenses. If issues come up requiring license amendments, you have to engage staff to ride herd on those and interact with the NRC to push those through. Then there is the hourly NRC staff time charge, which I'm sure the NRC will be glad to multiply by the number of separate licenses you have. If you multiply all those things by the number of licenses you're holding, you quickly get overwhelmed by licensamania.

My point is that there has to be some give on the regulatory side if this is going to happen. If we are truly to have a re-birth of this technology, throwing up more institutional barriers to making it happen is not helpful, and simply plays into the hands of the intervenors.
Anonymous said…
4.8 million a year is nothing compared to the 1 billion in up front licensing it costs before you can even move the first shovel of dirt. At 125MW that would mean $8000/kw just in licensing costs which means the plant is uneconomical before construction even begins.
Anonymous said…
Source for $1 billion in licensing costs for a new nuclear plant, please? that's a wildly high figure, nearly 15% of total capital costs. I've seen estimates closer to $20-30 million for navigating NRC's newer Part 52 process to get a COL.
Engineer-Poet said…
"Source for $1 billion in licensing costs for a new nuclear plant, please?"

I believe that's the estimate for the first-of-a-kind of a new type of reactor (meaning, not a PWR or BWR cooled by light water).  This is why the S-PRISM may go to Britain, and the FOAK production-scale molten-salt reactor will either be for the Defense department (outside NRC authority) or overseas as well.
Anonymous said…
Still waiting on a source

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