Congress recently passed a massive subsidy for the next 6,000 MW of new US nuclear power.  What you are seeing is a queueing to get that subsidy.

Will any nukes be built beyond 5 or 6 to use up that subsidy ?

IMHO, none going commerical before 2020 and perhaps 2025.  The subsidy losers will wait and see how things develop fro the pioneers (whilst lobbying for more subsidies).

Meanwhile, existing wind farms have been expanded within 12 months of a financial deciaions, and 30 months is "standard" for green field wind farms.

Nuclear has a place, but it FAR behind wind (with some pumped storage at a later stage).

I am truly embarressed by the nuclear production tax credit and can not offer a justification for it.  The credit was originally for the FIRST 6,000 MW of capacity to come on line but last I read it was to be split prorata amongst all units operational before a certain date.  This may have not made it into the final IRS rule.

The nuclear schedule insurance is something that is justifiable as it compensates for government incompetencies only.