"newshound" wrote in message
o.uk...
On 18/02/2021 13:06, jon wrote:
On Thu, 18 Feb 2021 12:39:22 +0000, Steve Walker wrote:

On 18/02/2021 12:21, Tim Streater wrote:
On 18 Feb 2021 at 12:03:48 GMT, Steve Walker
wrote:

On 17/02/2021 17:03, michael adams wrote:

In pointing out the "mistakes" that they made Tim Streater is
merely reinforcing the point - of how easy it is, without the
benefit of hindsight for people who aren't particularly stupid to
make "mistakes".

Chernobyl was not a mistake, it was known bad design, there was
reliance on operators to avoid a particular operating regime due to
that design constraint, there was no safety system to prevent such
operation and someone chose to carry out an unauthorised test, within
that regime, outside even the test's pre-determined parameters.

I don't like the term "bad design".

I think its the most accurate succinct description.

I'm not sure it is possible to design and build anything useful that does
not have some limitations.

Correct, but thats a different issue entirely.

The operators got confused and took it outside its clearly defined
permissible envelope.

But a better design stops that from happening quite a bit of the time.

Rather like putting a 747 into a vertical dive, and then trying to pull
out at 600 knots.

But the best design stops you from putting it into
a vertical dive, because it is never necessary to do
that with a passenger or freighter aircraft.

When our experts looked at the RBMK in the 1970's they decided it would
not have been licensable in the UK presumably because of the lack of
interlocks to prevent it being taken beyond the safe envelope. But as we
have seen recently with the Max 8, safety system design can be cocked up
too.

Yes, thats obvious with airbus that deliberately ploughed
a forest due to a bad design of that system.

Also, it wasn't an unauthorised test; but it had not been reviewed as
carefully as it would have been in the UK.

But the best designs cant be deliberately put into a situation
which can result in the destruction of the reactor.