On 15/12/17 08:25, Chris Hogg wrote:
On Fri, 15 Dec 2017 06:31:55 +0000, The Natural Philosopher
wrote:

On 14/12/17 23:59, Steve Walker wrote:

It is actually a fundamental design flaw. If a new station was being
designed from scratch, they would not be relying upon protecting the
generators - they had done that anyway, but not anticipated such a high
tsunami and so the protections were insufficient. Modern practice would
be to design the reactor so that it would fail-safe without power to the
control systems. The target now is passive safety rather than active as
nothing can fail to operate, lose power or sieze from misuse if nothing
has to move or be controlled.

SteveW
It wasnt power to the control systems thatwas the problem. It was power
to the circulation pumps

The reactors were scrammed: nothing left to control. Just a simple
matter or removing decay heat.

+1. AIUI current designs rely on a gravity feed for such cooling
water, i.e. a water tank on stilts.

Ok as long as you dont turn the reactor upside down :-)


--
The theory of Communism may be summed up in one sentence: Abolish all
private property.

Karl Marx