The nuclear industry is betting on small modular reactors (SMRs) to regain its competitive edge in markets such as the U.S. and Canada. Proponents say the reactors can be built cheaply once multiple units start being ordered and can even lead to lucrative export opportunities. There’s just one problem. If you build an SMR in the U.S., for example, you can’t sell it in Canada until Canadian regulators have approved the design. And the same goes for every other nuclear market in the world. Even nuclear insiders recognize that this could be a big issue for SMRs.