In message , at 10:52:21 on Sun, 11 Aug
2019, Andrew remarked:

The nukes are steam turbines. The rotational inertia will cover the
grid for a minute or twow while* Dinorwig spools up.

Unless an electrical fault stops the power reaching the grid.
Unless it occurs at a time when the mountain reservoir has already
been used up.

And either of those co-inciding with one of these 10-yr events of two
generators going offline in a matter of minutes.

The windmills didn't suddenly stop turning, an electrical 'situation'
took that farm off line.

Have they published something about that (genuine question).

My own theory is that they weren't initially running flat out, but did
respond to a greater demand, which due to the high winds took some part
of the installation to the point it shut down for safety reasons. It
could have been the sails running away too fast.
--
Roland Perry