Daily-Dose

Contents

From New Yorker

From Vox

The design approved by US regulators uses 12 light-water reactors in a plant, each producing 50 MW, much smaller than most conventional reactors that range in the hundreds of megawatts. But the company has since shifted to a larger power output design. NuScale has now submitted a proposal for a higher capacity module producing 77 MW in a six-unit configuration based on results from early tests.

“We saw an advantage to uprating the power,” said Jose Reyes, chief technology officer for NuScale. “As we learned more about the performance of the machine itself, we realized we had quite a bit of margin.”

The new design will require another round of checks and approvals and has pushed back the timelines for NuScale’s projects. In both designs, the reactor module is about 15 feet in diameter and 76 feet tall. Each design would produce about 462 MW of electricity in total.

One key advantage to SMRs is that the reactors would be built at a factory before being shipped to sites around the world. That’s unlike conventional reactors, which are typically built on-site, albeit with large, pre-fabricated parts, which means they require specialized construction equipment and transportation infrastructure. Since they’re tailored to a specific customer, the builders can’t easily apply lessons from one plant to another, making it hard to achieve economies of scale and adding to the construction and operation costs of conventional nuclear power.

While NuScale’s reactor design is standard, the plants they’re installed in can be scaled up or down in terms of capacity by adjusting the number of reactor modules. They can also be built in more remote locations, unlike most conventional nuclear power plants that require a power input from the grid to run auxiliary systems like cooling or on-site backup generators.

Like many of the new generation of nuclear reactor concepts, NuScale’s reactor was designed with passive safety systems that can automatically stop it if something goes wrong. Unlike conventional reactors, “we don’t require any integration to the grid for safety,” Reyes said, reducing the risk of outages and larger potential failures like meltdowns. Another perk of using a handful of small reactors at a plant rather than a couple big ones is that when a reactor is down for refueling or maintenance, a smaller chunk of power goes offline.

Cut-away views of a conventional nuclear reactor and a small modular reactor. US Government Accountability Office
The basic design differences between a conventional nuclear reactor and a small modular reactor plant.

NuScale now has projects underway in Wisconsin, Missouri, and North Carolina. Its first US plant, called the Carbon Free Power Project, will be built at Idaho National Laboratory and is scheduled to reach full production by 2030, generating 462 megawatts of electricity to be sold to a consortium of utilities. NuScale is also working to build its plants in countries including Romania, South Korea, and Poland.

Another advantage of NuScale’s design over conventional nuclear is that it can ramp power up and down more readily and has the built-in capability to follow power demand. “We can go from 20 percent power to 100 percent power in 96 minutes,” Reyes said. Conventional nuclear power plants are optimized to run at a high, steady rate, which makes them a poor fit as intermittent wind and solar power plug into the grid, bringing sudden crests and dips in electricity production.

The market is stacked against nuclear power

SMR developers may be going small, but they still face many of the same big headwinds as other energy companies, including supply chain disruptions, inflation, and rising interest rates that make financing and building more expensive. And while some SMRs are built on existing nuclear power designs, they are still first-of-a-kind in terms of their smaller scales and how they work together in a plant. Companies have to learn how to transport a nuclear reactor rather than building one on site, for example. This creates the potential for cost overruns as companies run into the usual initial snags.

NuScale has already revised its cost estimates upward for its first plant, the Carbon Free Power Project. It was initially projected to produce power at $58 per megawatt-hour, but has now risen to $89 per megawatt-hour as costs of materials like steel have grown and interest rates surged.

The overall price tag has grown to $9.24 billion from an initial estimate of $6 billion and could still go higher.

“The biggest issue that the nuclear [industry] has to tackle is the topic of risk of that investment,” said Bill Lacitiva, a partner at McKinsey who leads its nuclear energy work. While the upfront costs may be lower than conventional nuclear for utilities, SMRs will still need years, if not decades, to pay back their investment, raising worries that SMRs could fall into the same pits as their bigger brethren. “The history has not been positive in that respect when investors look at this,” Lacitiva said.

SMRs also have to contend with many of the high fixed costs that come with nuclear energy. Complying with nuclear energy regulations is expensive and limits where developers can build plants. Though some SMR designs incorporate new safety features, regulatory agencies have to readjust their processes to evaluate new technologies, and that on its own can be tedious.

It also takes a specialized, highly trained workforce to build and operate nuclear facilities, but the industry is already struggling to retain personnel as earlier generations of workers retire. And it’s hard to recruit new staffers when the country goes decades between building new reactors. Nuclear fuel also requires specialized processing. And most countries, including the US, still don’t have a permanent place to store nuclear waste.

At the same time, many electricity systems in the US have shifted to competitive markets, where power plants bid to provide electricity at the lowest possible cost. Grid operators can buy electricity a day ahead or in real time. When wind and solar power are available, they’re often the cheapest source of power and can undercut more expensive nuclear energy.

Nuclear does have a valuable trait in that it can produce a steady stream of electrons without emitting greenhouse gasses, providing reliable baseload power. But in some markets, it’s hard to reward this function, and as long as there isn’t a price on carbon, coal and gas plants can often perform this task cheaper.

That’s why SMR developers like NuScale are also pitching their plants as a way to power industrial processes, to produce hydrogen or to desalinate water, creating other revenue streams.

Governments may have to step up their support as well. That includes taxing greenhouse gas emissions, smoothing over the regulatory process, and providing more backstops to assure skittish investors. “The successful long-term deployment of SMRs hinges on strong support from policy makers and regulators to leverage private sector investment,” according to the International Energy Agency’s 2022 report on nuclear power.

But given the need for more energy and fewer greenhouse gas emissions, the potential for nuclear energy is hard to ignore. The US currently has about 95 gigawatts of nuclear capacity, much of it from reactors that are decades old and inching toward the ends of their lives, so the US will need to begin constructing more nuclear power just to maintain its 47 percent share of carbon-free electricity on the grid. As everything from cars to stoves to furnaces switches to electricity, power demand is poised to grow. And if nuclear is aiming to dethrone natural gas and coal — currently 60 percent of US electricity — it will take even more. “An aggressive case … could be more than 300 gigawatts total of nuclear needed, which is roughly 250 gigawatts of new [additional power],” Lacitiva said. “Those are massive numbers, and construction on a scale that at least the nuclear industry has never seen.”

All these hurdles may be too tall for SMRs to vault on their own. For nuclear to truly clear the bar, the industry will need a decades-long commitment from policymakers to see this build-out through, including financing, research and development, and a coherent climate strategy that favors cleaner sources of energy over fossil fuels. The technology has to get much cheaper too. Nonetheless, SMRs could be a crucial tool to help fix one of the biggest problems the world faces.

From The Hindu: Sports

From The Hindu: National News

From BBC: Europe

From Ars Technica

From Jokes Subreddit