In message
,
Andy Dingley writes
On Mar 19, 5:19*pm, The Natural Philosopher
wrote:

PWR reactors are capabe of cooling the cores by convection alone in a
shutdown situation.

Firstly they're not. Only some recent designs, very few of which have
yet been built (at commercial sizes)

Secondly the reactors at Fukushima are BWRs, not PWRs.
I was reading p on Windscale today having more than a passing interest
in that particular accident. It was air cooled and they put out the fire
by - switching off the fan!!
--
hugh
"Believe nothing. No matter where you read it, Or who said it, Even if
I have said it, Unless it agrees with your own reason And your own
common sense." Buddha