Re: Parlaiment Committee on Nuclear Power

In article <djfpu4$pq1$1$8302bc10@xxxxxxxxxxxxxxxx>,
"Paul E. Bennett" <peb@xxxxxxxxxxxxxxxxxx> wrote:

> John Beardmore wrote:
>
> > In message <ahcml1151l2c6hbubkfoi49v1olfcn5k5s@xxxxxxx>, David Hansen
> > <SENDdavidNOhSPAM@xxxxxxxxxxxxxx> writes
> >>On Sat, 22 Oct 2005 13:22:04 +0100 someone who may be "Paul E.
> >>Bennett" <peb@xxxxxxxxxxxxxxxxxx> wrote this:-
> >
> >> Nuclear cannot be controlled and so when it is
> >>started (a long process)
> >
> > Is this really true ? I thought it was about 20 minutes ?
>
> Power stations like Heysham and Torness can be fully on line from cold in
> around 35 minutes. Control is merely by the raising or lower of control
> rods in the reactor. This speed of bring-up though is not preferred so they
> will tend to spend about half a day getting going.

>From my experience on USS Enterprise in the seventies a nuclear plant
(PWR) can go from about 30% power to zero and back to 100% in a thirty
second period (aircraft down on launch, dead ahead at 800 yards). At the
time the core was quite old and a little rod movement was necessary.
For most transience no rod movement is required except to compensate for
xenon burnout or buildup. In PWRs the negative temperature coefficient
will make core power follow the load.

Mike
.

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