BULLETIN No. 1: Why are SMRs a Dog's Breakfast of Designs?
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by SMRs Information Task Force October 17, 2023
As of 2023 roughly 50 small modular reactor (SMR) designs are under development, with electrical generating capacity varying between 5 and 300 megawatts.
Compared to the current generation of larger nuclear reactors, SMRs would require smaller capital investments and provide options for deployment at remote locations with smaller power demands. But as reactor size goes down, unit cost goes up, as does the amount of radioactive waste per unit of electricity generated.
Different technology options attempt to address the concerns that plague the nuclear industry: safety, cost, radioactive waste, and weapons proliferation. However, designing for “passive safety”, opting for “waste recycling”, or providing “proliferation resistance” all involve trade-offs. With no clear “best” design, and no sizeable market, there is no justification for building a factory to mass-produce “modular” components to bring down costs.
SMR promoters have steered the debate away from these issues, arguing that all options for addressing climate change must be on the table. More SMR designs mean more opportunities to secure public subsidies.
The Government of Canada appears to have accepted the "all options” argument, and by funding multiple SMR designs is contributing to the illusion of profitability. Canada's nuclear regulator, despite its limited capacity for technical assessment of SMR designs, has opted to boost them through largely inconsistent “vendor design reviews.”
More than 80 years have passed since the first controlled, self-sustaining nuclear chain reaction. All proposed SMRs are essentially variations on older reactor designs that were tested decades ago and eventually abandoned.
The World Nuclear Industry Status Report concludes that SMRs “will likely face major economic challenges and not be competitive on the electricity market.”
Why are small modular reactors (SMRs) a real headache for designers?
In 2023, around fifty small modular reactors (SMRs) were under development, with an electricity production capacity varying between 5 and 300 megawatts.
Compared to the current generation of large nuclear reactors, SMRs would require less capital investment and provide opportunities for deployment in remote locations where electricity demand is lower. But as the size of the reactor decreases, the unit cost increases, as does the quantity of radioactive waste per unit of electricity produced.
Different technological options attempt to address the concerns of the nuclear industry: safety, cost, radioactive waste and proliferation of nuclear weapons. However, the design of "passive security", the choice of "waste recycling" or "proliferation resistance" all involve trade-offs. In the absence of a "better" design and a large market, there is little justification for building a factory to mass produce "modular" components to reduce costs.
Proponents of SMRs have diverted the debate away from these issues, arguing that all options for combating climate change must be put on the table. More PRM designs mean more opportunities to obtain public subsidies.
The Government of Canada appears to have accepted the "all options" argument and, by funding several SMR projects, it is contributing to the illusion of profitability. Canada's nuclear regulator, despite its limited capacity to technically assess SMR projects, has chosen to encourage them through an "assessment" without any consequences.
More than 80 years have passed since the first controlled, self-sustaining nuclear chain reaction. All proposed small modular reactors are essentially variations of older reactor designs that were tested decades ago and ultimately abandoned.
The State of the Global Nuclear Industry report concludes that SMRs "are likely to face major economic challenges and will not be competitive in the electricity market."
Did you do your due diligence on climate action?
Visit smrs-info.ca to learn more.
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The SMRs Education Task Force is a network of groups in Canada concerned and active on the nuclear file. Together we have many decades of experience providing information to Canadians about nuclear issues, including the proposed small modular nuclear reactors (SMRs). We are providing this bulletin free of charge to encourage more informed awareness of SMRs and their potential implications for communities across the country.