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Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

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On 28/10/2013 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?



From http://www.bbc.co.uk/news/uk-24699748#TWEET937307


"Both reactors in Dungeness power station's B units have been
automatically shut down after power to the site was cut off. The site's
own generators are providing power to the site"
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On 28/10/2013 10:50, Andrew May wrote:
On 28/10/2013 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?



From http://www.bbc.co.uk/news/uk-24699748#TWEET937307


"Both reactors in Dungeness power station's B units have been
automatically shut down after power to the site was cut off. The site's
own generators are providing power to the site"


This has always been standard practice in the UK.

Going off topic, I was amused in one of the "£100k house" programmes
when the architect took the client off to a bleak, windswept bit of
shingle littered with derelict boats. Just as I was thinking "Looks just
like Dungeness", they announced that it was. It really can be bleak: I
was once there for an interview in December, the rain was almost
horizontal and all the seagulls were sheltering in the lee of the A-site
carpark wall. Even in nice weather the foreshore looks positively
Dickensian.
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On 28/10/13 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

Dungeness IIRC, It lost the grid connection and shut down

BBC have a story somewhere.


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lead are elected by the least capable of producing, and where the
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Peoples brains probably.
Brian

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"Dave Liquorice" wrote in message
ll.co.uk...
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

--
Cheers
Dave.







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Well, that is rather odd, don't you think, surely as there are two of them,
they of all people should have enough spare power for themselves!

Brian

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"Andrew May" wrote in message
...
On 28/10/2013 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?



From http://www.bbc.co.uk/news/uk-24699748#TWEET937307


"Both reactors in Dungeness power station's B units have been
automatically shut down after power to the site was cut off. The site's
own generators are providing power to the site"



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On 28/10/2013 14:20, Brian Gaff wrote:
Well, that is rather odd, don't you think, surely as there are two of them,
they of all people should have enough spare power for themselves!

Brian


Indeed, but what should they do with any power they generate, if they
are off the grid?


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On 28/10/13 14:27, GB wrote:
On 28/10/2013 14:20, Brian Gaff wrote:
Well, that is rather odd, don't you think, surely as there are two of
them,
they of all people should have enough spare power for themselves!

Brian


Indeed, but what should they do with any power they generate, if they
are off the grid?


that is teh problem. Each reactor takes about 40MW to stay up and safe
even when shut down cooling pumps and the like.

But the reactor decay heats is only about 2MW. and you can't run an AGR
reactor at 10% of its output. 30% is about the minimum and its an
'unusual' regime.




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On Mon, 28 Oct 2013 13:50:33 +0000, The Natural Philosopher wrote:

On 28/10/13 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

Dungeness IIRC, It lost the grid connection and shut down

BBC have a story somewhere.


Telegrope blames 'hurricane force winds' - I thought they hadn't turned up
apart from in pulp fiction.

Cheers

Dave R
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On 28/10/13 15:12, David.WE.Roberts wrote:
On Mon, 28 Oct 2013 13:50:33 +0000, The Natural Philosopher wrote:

On 28/10/13 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

Dungeness IIRC, It lost the grid connection and shut down

BBC have a story somewhere.


Telegrope blames 'hurricane force winds' - I thought they hadn't turned up
apart from in pulp fiction.


Well they have an they haven't. Round here there are signs that nasty
little highly localised eddies or tornadoes have snapped trees.

so it is possible that something has bitched a power line - and quite a
big power line if the station was cut off.




Cheers

Dave R



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lead are elected by the least capable of producing, and where the
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rewarded with goods and services paid for by the confiscated wealth of a
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On 28/10/13 15:12, David.WE.Roberts wrote:
On Mon, 28 Oct 2013 13:50:33 +0000, The Natural Philosopher wrote:

On 28/10/13 10:37, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear
just after 0700 this morning. Capacity taken up by pumped and hydro.
The EDF .pdf nuke status page hasn't been updated since the 21st.

What has dropped off line?

Dungeness IIRC, It lost the grid connection and shut down

BBC have a story somewhere.


Telegrope blames 'hurricane force winds' - I thought they hadn't turned up
apart from in pulp fiction.

Cheers

Dave R

(Reuters) - The storm that swept across southern Britain on Monday
morning caused nuclear power outages at the Dungeness B21 and B22 units,
operator EDF Energy said.

EDF Energy said on its website that both units, which have a capacity of
550 megawatts (MW) each, came off at 0744 GMT on Monday, adding that
unit availability was expected to be zero for the next seven days.

"The shutdown was weather-related. The plant reacted as it should and
shut down safely," an EDF Energy spokeswoman said.

The company said in a separate statement that both reactors were shut
after power to the site was cut off.

"The station is liaising with National Grid regarding returning the
power supply," the statement said.

A strong storm battered southern parts of England and Wales early on
Monday, with wind speeds reaching almost 100 miles per hour, cutting
power supplies to around 220,000 homes, forcing flight cancellations,
disrupting trains and closing many roads and bridges.

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On 28/10/2013 15:10, The Natural Philosopher wrote:
On 28/10/13 14:27, GB wrote:
On 28/10/2013 14:20, Brian Gaff wrote:
Well, that is rather odd, don't you think, surely as there are two of
them,
they of all people should have enough spare power for themselves!

Brian


Indeed, but what should they do with any power they generate, if they
are off the grid?


that is teh problem. Each reactor takes about 40MW to stay up and safe
even when shut down cooling pumps and the like.

But the reactor decay heats is only about 2MW. and you can't run an AGR
reactor at 10% of its output. 30% is about the minimum and its an
'unusual' regime.




I thought the answer was to have a few supercapacitors to charge up .... :-)

--
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On 28/10/13 19:25, polygonum wrote:
On 28/10/2013 15:10, The Natural Philosopher wrote:
On 28/10/13 14:27, GB wrote:
On 28/10/2013 14:20, Brian Gaff wrote:
Well, that is rather odd, don't you think, surely as there are two of
them,
they of all people should have enough spare power for themselves!

Brian


Indeed, but what should they do with any power they generate, if they
are off the grid?


that is teh problem. Each reactor takes about 40MW to stay up and safe
even when shut down cooling pumps and the like.

But the reactor decay heats is only about 2MW. and you can't run an AGR
reactor at 10% of its output. 30% is about the minimum and its an
'unusual' regime.




I thought the answer was to have a few supercapacitors to charge up ....
:-)

reuters are reporting EDF as saying 'sometime later ths week'


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On Mon, 28 Oct 2013 16:50:16 +0000, The Natural Philosopher wrote:

so it is possible that something has bitched a power line - and quite a
big power line if the station was cut off.


Or breakers in a grid switching center got upset by the surges caused
by lines downstream being brought down and tripped Dungeness off.

Once tripped off and Dungeness going into emergency shutdown it takes
about a week to sort things out and bring it back online.

I wonder if the operators at Dungeness could see the varying load and
were aware of the possibilty of a trip or if the first thing they
knew was AWOOGA! AWOOGA! SHUTDOWN! SHUTDOWN! causing them to spill
their morning cup of tea?

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On Tuesday, October 29, 2013 1:02:31 AM UTC, Dave Liquorice wrote:
On Mon, 28 Oct 2013 16:50:16 +0000, The Natural Philosopher wrote:

so it is possible that something has bitched a power line - and quite a
big power line if the station was cut off.


Or breakers in a grid switching center got upset by the surges caused
by lines downstream being brought down and tripped Dungeness off.

Once tripped off and Dungeness going into emergency shutdown it takes
about a week to sort things out and bring it back online.

If the reactor is tripped from full power then if you don't restart within a few hours Xenon135 builds up (it's not produced durectly by the fission reaction, but by decay of Iodine135, so production doesn't stop when fission stops) and absorbs so many neutrons you can't restart safely for several days (I don't have my textbook on reactor physics with me to give more detail...) If you get an unexpected trip it might take too long to assure yourself that it's safe to restart before the deadline.


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On 29/10/13 01:02, Dave Liquorice wrote:
On Mon, 28 Oct 2013 16:50:16 +0000, The Natural Philosopher wrote:

so it is possible that something has bitched a power line - and quite a
big power line if the station was cut off.


Or breakers in a grid switching center got upset by the surges caused
by lines downstream being brought down and tripped Dungeness off.

Once tripped off and Dungeness going into emergency shutdown it takes
about a week to sort things out and bring it back online.

I wonder if the operators at Dungeness could see the varying load and
were aware of the possibilty of a trip or if the first thing they
knew was AWOOGA! AWOOGA! SHUTDOWN! SHUTDOWN! causing them to spill
their morning cup of tea?

AIUI there are automatic safety trips that would detect and
undecurrent/overvoltage/overspeed and synch loss on the generators and
essentially shut off the turbine steam before it revved beyiond safe
limits. Thats a governor of sorts.

Then one would expect te main breakers would blow isolating the station
from the grid, at which point its on battery power and the diesels would
start up,

the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core. A cannot remember where AGRS use convection or pumped gas but they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.

At this point there will be steam to vent to prevent overpressures in
the boilers, and probably some way to divert excess heat straight to the
condensers without the turbines being involved. Thse will spin down and
stop.

Asyousay it takes time to get everything up and working again. restioing
the grid to get off diesel power would be priority and take a day or two
at most.

Then they mighttae te opportunity to do spome minteneace work or cold
refuelling (AGRS are usually refuelled at part power or cold)

then spinning up and synching..

Anyway weve got 4 reactors down in three power plants - two at dungeness
, and one each at two sites for regulatory inspections. Both will be
back up by X mas..

EDF gives no firm date yet to restart dungeness.

Presumably they will want to assess if any other damage ocurred.

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On 29/10/13 10:40, wrote:
On Tuesday, October 29, 2013 1:02:31 AM UTC, Dave Liquorice wrote:
On Mon, 28 Oct 2013 16:50:16 +0000, The Natural Philosopher wrote:

so it is possible that something has bitched a power line - and
quite a big power line if the station was cut off.


Or breakers in a grid switching center got upset by the surges
caused by lines downstream being brought down and tripped Dungeness
off.

Once tripped off and Dungeness going into emergency shutdown it
takes about a week to sort things out and bring it back online.

If the reactor is tripped from full power then if you don't restart
within a few hours Xenon135 builds up (it's not produced durectly by
the fission reaction, but by decay of Iodine135, so production
doesn't stop when fission stops) and absorbs so many neutrons you
can't restart safely for several days (I don't have my textbook on
reactor physics with me to give more detail...) If you get an
unexpected trip it might take too long to assure yourself that it's
safe to restart before the deadline.

That rings a bell. yea. xenon poisoning..




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On Tue, 29 Oct 2013 09:58:00 +0000, Tim Streater
wrote:

I expect JJ to try and dine out on what he would like to term an
"emergency shutdown" for what was just SOP.


Your bigotry is leading you to express opinions on my behalf that I
myself have not expressed and would not express.

JJ's "emergency" - nuke emergency - potential Chernobyl


It's very interesting that you should say that, because it reveals a
great deal about the way your mind works, and absolutely nothing about
the way mine does.

that is the sequence he'd like to establish in peoples' minds. Him and
others, too.


No, I'd just like it if you and others could learn to think in terms
of logic rather than bigoted stereotypes.
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I don't usually bother to post about spelling mistakes, but, like many
of your posts recently, this is getting ridiculously difficult to read
- what exactly is your problem with using a spell checker?

On Tue, 29 Oct 2013 13:34:48 +0000, The Natural Philosopher
wrote:

aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core.

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Java Jive wrote:

On Tue, 29 Oct 2013 09:58:00 +0000, Tim Streater
wrote:

I expect JJ to try and dine out on what he would like to term an
"emergency shutdown" for what was just SOP.


Your bigotry is leading you to express opinions on my behalf that I
myself have not expressed and would not express.

JJ's "emergency" - nuke emergency - potential Chernobyl


It's very interesting that you should say that, because it reveals a
great deal about the way your mind works, and absolutely nothing about
the way mine does.

that is the sequence he'd like to establish in peoples' minds. Him and
others, too.


No, I'd just like it if you and others could learn to think in terms
of logic rather than bigoted stereotypes.


You could always lead by example.

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On Monday, 28 October 2013 10:37:55 UTC, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear

just after 0700 this morning. Capacity taken up by pumped and hydro.

--

Cheers

Dave.


Where are you seeing this information?

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On 30/10/13 20:45, Steven Langdale wrote:
On Monday, 28 October 2013 10:37:55 UTC, Dave Liquorice wrote:
Seems to have been an instant drop of about 1 GW sourced from nuclear

just after 0700 this morning. Capacity taken up by pumped and hydro.

--

Cheers

Dave.


Where are you seeing this information?

http://gridwatch.templar.co.uk ?

both Dungeness reactors **** down, one scheduled to restart thuis
weekm, the other next week.

http://www.edfenergy.com/about-us/en...ant-status.pdf

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Coming from you, that's prize hypocrisy. Why don't you see if you can
even start, in which case I'll happily follow.

On 30 Oct 2013 18:10:41 GMT, Terry Fields
wrote:

You could always lead by example.

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In article ,
The Natural Philosopher writes:
the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core. A cannot remember where AGRS use convection or pumped gas but they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.


They can get away without pumps in an emergency - convection cooling
by the gas alone can take away the power generated when shutdown.
That's one of their key safety design features.

--
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On 30/10/2013 22:27, Andrew Gabriel wrote:
In article ,
The Natural Philosopher writes:
the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core. A cannot remember where AGRS use convection or pumped gas but they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.


They can get away without pumps in an emergency - convection cooling
by the gas alone can take away the power generated when shutdown.
That's one of their key safety design features.

Correct. And things happen relatively slowly with some thousands of tons
of graphite to heat up.


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On Wed, 30 Oct 2013 13:45:55 -0700 (PDT), Steven Langdale wrote:

Seems to have been an instant drop of about 1 GW sourced from

nuclear
just after 0700 this morning. Capacity taken up by pumped and

hydro.

Where are you seeing this information?


Interpreted from the plots on gridwatch, the 1 GW loss from Dungeness
is still very visible in the weekly plot the pickup from pumped and
hydro less so:

http://www.gridwatch.templar.co.uk/

Ooo, we have percentages now...

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Dave Liquorice wrote:

http://www.gridwatch.templar.co.uk/
Ooo, we have percentages now...


Two decimal places seems excessive though (especially considering the
fudge-factors for non-metered solar/wind/digester sources).


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On 30/10/13 22:36, newshound wrote:
On 30/10/2013 22:27, Andrew Gabriel wrote:
In article ,
The Natural Philosopher writes:
the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core. A cannot remember where AGRS use convection or pumped gas but they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.


They can get away without pumps in an emergency - convection cooling
by the gas alone can take away the power generated when shutdown.
That's one of their key safety design features.

Correct. And things happen relatively slowly with some thousands of tons
of graphite to heat up.


no, in fact they dont. An its not thousands, its hundreds at most.

The reasons for the delays are more about the nuclear-chemical
consequences of shutting down in a hurry.

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lead are elected by the least capable of producing, and where the
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On 31/10/13 07:18, Andy Burns wrote:
Dave Liquorice wrote:

http://www.gridwatch.templar.co.uk/
Ooo, we have percentages now...


Two decimal places seems excessive though (especially considering the
fudge-factors for non-metered solar/wind/digester sources).


The are no fudge factors. Just not everything is metered centrally.

Gridwatch doesnt fudge.

Renewable UK and DECC fudge.

Gridwtach is an accurate report of *limited data*, not a 'guess' as to
what the total data is.


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The Natural Philosopher wrote:

On 31/10/13 07:18, Andy Burns wrote:

Two decimal places seems excessive though (especially considering the
fudge-factors for non-metered solar/wind/digester sources).


The are no fudge factors. Just not everything is metered centrally.
Gridwatch doesnt fudge.
Renewable UK and DECC fudge.


I didn't say you fudged, but you did say it was based on fudged data.




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On 31/10/2013 10:26, The Natural Philosopher wrote:
On 30/10/13 22:36, newshound wrote:
On 30/10/2013 22:27, Andrew Gabriel wrote:
In article ,
The Natural Philosopher writes:
the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas through te
core. A cannot remember where AGRS use convection or pumped gas but
they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.

They can get away without pumps in an emergency - convection cooling
by the gas alone can take away the power generated when shutdown.
That's one of their key safety design features.

Correct. And things happen relatively slowly with some thousands of tons
of graphite to heat up.


no, in fact they dont. An its not thousands, its hundreds at most.

The reasons for the delays are more about the nuclear-chemical
consequences of shutting down in a hurry.


Well it is much slower than in a water reactor, partly because of the
lower fuel rating and partly the greater mass of moderator in the UK plant.

I don't have the figures for AGRs to hand, but the Wylfa core contains
3740 tonnes of graphite. The AGR core is the same height, but certainly
quite a bit smaller in diameter. It must be close to a thousand tons.
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On 31/10/13 22:16, newshound wrote:
On 31/10/2013 10:26, The Natural Philosopher wrote:
On 30/10/13 22:36, newshound wrote:
On 30/10/2013 22:27, Andrew Gabriel wrote:
In article ,
The Natural Philosopher writes:
the rectorr would have been scrammed as part of the trip proecss,
stopping te chain reaction instantly, and the only nucelar issues left
aredeacy heat in te fuel rods, cibered by curculkatin te gas
through te
core. A cannot remember where AGRS use convection or pumped gas but
they
are very safe designs.

http://en.wikipedia.org/wiki/Advance...cooled_reactor

ah yes, forced water and gas coooling, so they need the pumps.

They can get away without pumps in an emergency - convection cooling
by the gas alone can take away the power generated when shutdown.
That's one of their key safety design features.

Correct. And things happen relatively slowly with some thousands of tons
of graphite to heat up.


no, in fact they dont. An its not thousands, its hundreds at most.

The reasons for the delays are more about the nuclear-chemical
consequences of shutting down in a hurry.


Well it is much slower than in a water reactor, partly because of the
lower fuel rating and partly the greater mass of moderator in the UK plant.

I don't have the figures for AGRs to hand, but the Wylfa core contains
3740 tonnes of graphite. The AGR core is the same height, but certainly
quite a bit smaller in diameter. It must be close to a thousand tons.


I take it back. there is less graphite in the AGRS, but its still over
1000 tonnes per reactor:-(




--
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(in-ep-toc-ra-cy) €“ a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

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