Nuclear reactor uptime is gonna be 90% at most, which is rather easy (battery capacity for several days) to beat even with just solar + batteries (in equatorial and most mid-latitude regions, at least).
And this BWRX design is based on ABWR which turned out to be only 70% in practice.
You don't get much useful notice for unplanned nuclear outages either, whereas both wind and solar output can be forecast with reasonable accuracy 24h in advance.
