Shares in companies tied to nuclear power jumped Friday, helped by President Donald Trump’s rollout of four executive orders that aim to provide a boost to the sector, but there were concerns about whether there could be much of a near-term impact.

President Trump signed executive orders Friday aimed at expanding the production of nuclear energy and easing the regulatory process on approvals for new nuclear reactors. Stocks related to nuclear power and uranium production have been surging after Reuters reported late Thursday that the executive orders were coming: Lightbridge (LTBR) +43%,

President Donald Trump on Friday signed orders meant to accelerate the construction of nuclear power plants, including small, untested designs that offer the promise of rapid deployment but have yet to be built in the US.