They are different things, although weapons grade plutonium and Uranium are residue from power generation, other than that one is not dependant on the other.
In the 1950s weapons-grade plutoniun was scarce and nuclear power stations such as Windscale produced it as a by-product. The world is now awash with weapons-grade plutonium (for use as triggers in thermonuclear warheads) and the building of new nuclear power stations wouldn't be a factor.
As they process weapons grade plutonium from nuclear power stations and there is a world wide shortage of uranium is this the reason for wanting to build more of them to satisfy our future needs? This government has made me cynical!