Power & Operations

In a recent opinion piece for the San Luis Obispo Tribune, Heather Hoff describes her conversion from nuclear energy skeptic to advocate and lays out the case for keeping the Diablo Canyon nuclear power plant open beyond its planned closure in 2025.

Hoff, who is an operations procedure writer at Diablo Canyon, tells how she spent years "excessively and sometimes annoyingly" investigating her concerns about the safety of nuclear after she was first hired at Diablo Canyon. She adds that she almost quit her job after the Fukushima accident until realizing that many concerns about that event were triggered by "fear of nuclear, rather than nuclear itself.”

The Department of Energy today announced an extension to its deadline for applications and sealed bid submissions under the $6 billion Civil Nuclear Credit (CNC) Program, launched earlier this year.

According to the DOE, owners and operators of nuclear power reactors most at risk of premature retirement due to economic difficulties have 47 more days to submit applications for certification and sealed bids for credits. The deadline for the first CNC award cycle, originally set for tomorrow, is now 11:59 p.m. MDT on July 5.

In a May 15 piece, the editorial board of The Denver Gazette has weighed in on Colorado’s continuing controversy regarding how the state gets its electricity. While the current discourse in the state primarily pits fossil fuels against wind and solar, the board asks, “How about an energy source that generates almost limitless power, leaves no carbon footprint, and produces practically no emissions? It’s nuclear power—as green as you can get.”

Microreactors upend the traditional economics of nuclear power plants by shifting the paradigm from economies of scale (large reactors) to economies of multiple (mass production). While shrinking power output per unit may increase costs per kilowatt compared to large plants, offsetting gains can be expected from simplified and standardized designs, factory fabrication, inherent safety, lower radionuclide inventories, fast installation, and low financing costs. For instance, the lower power density in a microreactor core leads to a greatly reduced decay heat source, simplifying emergency cooling needs. These design aspects can lead to innovations including substantial simplifications to safety and control needs, minimized human operational requirements, a very compact balance of plant, the ability to fabricate almost every component in a factory, shortened construction time, and less daunting financing.

“What if I told you that scientists had figured out a way to produce affordable electricity that was 99 percent safer and cleaner than coal or oil, and that this breakthrough produced even fewer emissions per gigawatt-hour than solar or wind?” That’s the question that Derek Thompson, a staff writer at The Atlantic, asks in his article, "The Forgotten Stage of Human Progress," before revealing, “The breakthrough I’m talking about is 70 years old: It’s nuclear power.”

The United States has just 93 operating power reactors at this writing. The fleet last numbered 93 in 1985, when nuclear generation topped out at 383.69 TWh, less than half of the 778.2 TWh produced in 2021.

While the 93 reactors operating today have more capacity, on average, than in 1985, most of that increased productivity is down to operational improvements that pushed the fleet’s average capacity factor from just 57.5 percent in the three-year period 1984–1986 to near 90 percent by the early 2000s.

A cross-section view of X-energy’s Xe-100 reactor. (Image: X-energy)

U.K. nuclear services company Cavendish Nuclear has signed a memorandum of understanding with U.S. reactor and fuel-design engineering firm X-energy to act as its deployment partner for high-temperature, gas-cooled reactors (HTGRs) in the United Kingdom.

Headquartered in Rockville, Md., X-energy is the developer of the Xe-100, an 80-MWe reactor with a modular design permitting it to be scaled into a “four-pack” 320-MWe power plant. As a pebble bed HTGR, the Xe-100 would use TRISO particles encased in graphite pebbles as the fuel and helium as the coolant.

According to a May 11 joint statement from the companies, development and deployment of HTGRs in the United Kingdom would support an increase in the nation’s energy security, contribute toward the government’s net-zero-by-2050 commitment, and create considerable opportunities for the U.K. nuclear supply chain.

Chuck Goodnight

Nuclear plant designers focus on safety and efficiency, and rightly so. But the next steps for new nuclear power technologies and new-build programs are typically focused on “overnight costs,” or the costs to develop the site and construct the nuclear power plant. The problem is that the overnight costs are only the “table stakes” in a much longer game. Investors and stakeholders must have the staying power to play until the end, which now looks to be close to 100 years after the start of a new-build program.

Assuming that the initial estimates of overnight costs are surmountable, total life-cycle costs (TLCs) should be next on the agenda, as they will significantly drive the final levelized cost of energy. TLCs include overnight costs, the operating company’s startup and development (or expansion) costs, life-cycle O&M costs, life-cycle capital reinvestment, shutdown/SAFSTOR, decommissioning and dismantling, and site remediation. The largest element of TLCs will be the non-fuel portion of life-cycle O&M costs, and the largest portion of those costs will be for labor.

Energy Harbor has signed a memorandum of understanding with blockchain company Standard Power to develop a large-scale carbon-free data infrastructure operation adjacent to the Beaver Valley nuclear plant, located in Shippingport, Pa.

In its May 9 announcement, Energy Harbor described Standard Power as “a leading infrastructure service provider for advanced data processing companies and a leading hosting provider for blockchain mining companies.”

Energy Harbor is based in Akron, Ohio.

Edesess

In a recent opinion piece in the Bulletin of the Atomic Scientists, mathematician and economist Michael Edesess writes that “The goal of net zero greenhouse gas emissions by 2050 [appears] unrealistic.” Edesess, a research associate of the EDHEC-Risk Institute, adds, “We must, in the final analysis, be realistic. Being real means that the renewable revolution requires nuclear power.”

Then: Edesess traces the history of interest in renewable energy sources to the 1970s when, he notes, climate change was not even part of the calculations. Back then, the thought was, “We only needed to reduce the oil we imported from the Middle East. Solar and wind could do that if only we could drive the cost down.” However, “For nuclear, driving the cost down was not the objective. The objective was to make nuclear power ever safer and safer. This drove nuclear power’s cost up.”

The Pittsburgh Post-Gazette’s Anya Litvak reported yesterday that Brookfield Business Partners, a subsidiary of Canada’s Brookfield Asset Management and an owner of Westinghouse Electric Company, is ready to sell the nuclear energy firm.

The total bill for the reactor expansion project at the Vogtle nuclear plant in Georgia is now expected to exceed $30 billion, according to the Associated Press. The original price tag for the two Westinghouse AP1000 units was $14 billion.

The United Kingdom’s energy minister, Greg Hands, recently presided over the opening of one of three new training centers in England aimed at supporting EDF Energy’s Hinkley Point C nuclear build project in Somerset. The centers, according to EDF, will provide locals with the skills necessary to join the ranks of about 4,000 additional workers expected to be needed for the next phase of the power station’s construction. Hands unveiled the Welding Centre of Excellence, located on the Bridgwater & Taunton College campus in Bridgwater.

Part one of this article, published in the May 2019 issue of Nuclear News[1] and last Friday on Nuclear Newswire, presented insights from the 1979 accident at Three Mile Island-­2 and addressed several issues raised by a previous Nuclear News piece on the accident[2]. Part two discusses safety improvements that have been made by both the industry and the Nuclear Regulatory Commission over the past 40 years.

U.S. secretary of state Antony Blinken and Armenian minister of foreign affairs Ararat Mirzoyan signed a memorandum of understanding last week concerning strategic civil nuclear cooperation (NCMOU).

According to the State Department, NCMOUs are used to develop stronger ties between the United States and partner countries’ nuclear experts, industry, and researchers, as well as to provide support for the U.S. civil nuclear industry and nuclear nonproliferation goals.

Bloomberg recently reported that nuclear power production in France declined to its lowest level in almost two years in April, with power output during that month falling to 21.7 TWh. The decline occurred as Électricité de France (EDF), one of the country’s major energy suppliers, dealt with long-term inspection-and maintenance-related halts to the operation of many of its 56 domestic nuclear reactors.

The Nuclear Regulatory Commission turned the tables a bit on its inspector general’s office this week, releasing its response to a March 25 OIG event inquiry that criticized an NRC inspection at California’s Diablo Canyon nuclear power plant, performed after a July 2020 auxiliary feedwater (AFW) system failure at Unit 2.

The response highlights a number of what the agency terms “factual errors” and takes issue with several portions of the OIG report.

Finnish energy company Fennovoima has terminated, effective immediately, its engineering, procurement, and construction (EPC) contract with RAOS Project Oy, a subsidiary of Russia’s Rosatom, for the delivery of a 1,200-MWe VVER-1200 pressurized water reactor at the Hanhikivi site in Finland’s Pyhäjoki municipality.

China’s State Council recently approved the construction of four Westinghouse AP1000 reactors—two at China’s Sanmen plant in Zhejiang Province and two at the Haiyang plant in Shandong Province.

The plants currently house two AP1000 units each. Sanmen’s reactors are rated at 1,157 MWe and Haiyang’s at 1,170 MWe. Sanmen-1 and -2 began commercial operation in 2018. Haiyang-1 started commercial operation in 2018, and Haiyang-2 in 2019.

NuScale Power has signed a collaboration agreement with the U.S. Reactor Forging Consortium (RFC) to leverage the nation’s forging supply chain to prepare for the deployment of NuScale’s small modular reactor technology and to support, maintain, and expand U.S. manufacturing jobs.