Small Modular Nuclear Reactors (SMRs) in Canada

[Oscar]

Small Modular Nuclear Reactors (SMRs) in Canada

[ https://crednb.ca/small-modular-nuclear ... in-canada/ ]

By Brennain Lloyd and Susan O’Donnell - ***NUMEROUS INTERNAL LINKS***

Article for the WISE/NIRS Nuclear Monitor, August 29, 2024 | Issue #918

A pdf copy of Nuclear Monitor issue #918 is HERE:
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EXCERPT: "Introduction: CANDUs versus SMRs
Canada developed the CANDU reactor, fueled with natural uranium mined in Canada and cooled and moderated with heavy water. All 19 operating power reactors in Canada – 18 in Ontario on the Great Lakes and one in New Brunswick on the Bay of Fundy – are CANDU designs with outputs ranging from about 500 to 900 MWe.

It’s been more than 30 years since the last CANDU was completed and connected to the grid in Canada. Attempts to build new ones were halted over high projected costs, and CANDU exports have dried up. To keep itself alive, in 2018 the nuclear industry launched a “roadmap” to develop smaller reactors and kick-start new nuclear export opportunities.

From 2020 to 2023, the Canadian government funded six so-called “Small Modular Nuclear Reactor” (SMR) designs. Only one – Terrestrial Energy’s Integral Molten Salt Reactor (IMSR) design – is Canadian.

The six designs are not only unlike the CANDU but also different from each other. The fuels range from low-enriched uranium, TRISO particles and HALEU (High-Assay, Low-Enriched Uranium) to plutonium-based fuel, and the different cooling systems include high-temperature gas, molten salt, liquid sodium metal and heat pipes. One design – Moltex – requires a separate reprocessing unit to extract plutonium from used CANDU fuel to make fuel for its proposed SMR.

Only one of the grid-scale SMR designs seems plausible to be built – the GE Hitachi 300 MWe boiling water reactor (BWRX-300) being developed at the Darlington nuclear site on Lake Ontario. This design uses low-enriched uranium fuel and is cooled by ordinary water. The Darlington site owner, the public utility Ontario Power Generation (OPG), is planning to build four of them.

Canada gave OPG a $970 million “low-interest” loan to help develop the BWRX-300 design. The other five SMR designs received considerably less federal funding, from $7 million to $50.5 million each, and most SMR proponents have been struggling to source matching funds. One design, Westinghouse’s off-grid eVinci micro-reactor, had early development costs funded by the U.S. military and now seems to have independent funding.

The Canadian Nuclear Laboratories (CNL) at Chalk River received more than $1.2 billion in 2023. CNL is operated by a private-sector consortium with two U.S. companies involved in the nuclear weapons industry and the Canadian firm Atkins-Réalis (formerly SNC Lavalin) which is also involved in almost every SMR project in Canada. CNL and Atomic Energy of Canada Limited are building an “Advanced Nuclear Materials Research Centre” at Chalk River, one of the largest nuclear facilities ever built in Canada, that will conduct research on SMRs.

Canada recently released a report suggesting that SMRs will be in almost all provinces by 2035, although most provincial electrical utilities have expressed no interest, and only Ontario, New Brunswick, Saskatchewan and Alberta are promoting SMRs. Alberta says it wants SMRs to reduce the GHG emissions generated in tar sands extraction. . . . ."

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