I don't disagree that we can build better designs. I disagree that we can build them quickly and cheap.
According to the OECD:
"As nuclear power plants are complex construction projects, their construction periods are longer than other large power plants. It is typically expected to take 5 to 7 years to build a large nuclear unit (not including the time required for planning and licensing)."
"Between 2002 and 2008, for example, cost estimates for new nuclear plant construction rose from between $2 billion and $4 billion per unit to $9 billion per unit, according to a 2009 UCS report, while experience with new construction in Europe has seen costs continue to soar."
All the modern design proposals are to mass-produce smaller units -- sometimes, completely sealed units -- which would then be installed several to a site, and maybe sent back to the manufacturer to be refurbished at periodic intervals. This is the "save money by mass production" economies-of-scale approach, as opposed to "save money by being more efficient with large custom-built plants" economies-of-scale approach which has failed the industry and led to many of those ballooning costs.
(Whether we have the regulatory wherewithal to go with that plan is another matter, but the very idea of reusing the same design over and over does help keep compliance costs down, and you can focus on site-selection costs.)
How does that compare with other sources? 5 Years and a few billion doesn't seem that bad to me. Even plans for building a few thousand new homes can be over the next ten to fifteen years.
According to the OECD:
"As nuclear power plants are complex construction projects, their construction periods are longer than other large power plants. It is typically expected to take 5 to 7 years to build a large nuclear unit (not including the time required for planning and licensing)."
"Between 2002 and 2008, for example, cost estimates for new nuclear plant construction rose from between $2 billion and $4 billion per unit to $9 billion per unit, according to a 2009 UCS report, while experience with new construction in Europe has seen costs continue to soar."