apeiron said:
...And the 90 a year was based on your suggested figure.
Yes I know the 90 reactors are for gap plugging in fossil fuel decline based on my estimate of 30 reactors per 1 EJ/yr replacement. My second question was about your figure of 190 (6.3 EJ/yr) Buisiness-As-Usual new demand reactors. What is the basis of that figure? Edit: appears you address that below, thanks.
apeiron said:
I've already halved the nuclear contribution in the 190 figure I quoted - accepting scenarios like the Shell study where biofuels and other renewables take up the slack.
(p17 - http://www-static.shell.com/static/public/downloads/brochures/corporate_pkg/scenarios/shell_energy_scenarios_2050.pdf)
Before I plough through that 52 pgr, what exactly are saying that the Shell scenario provides as relevant to your point? Could you quote a relevant passage?
apeiron said:
Agreed (
you meant this top link I believe)
apeiron said:
Consumption would be double this by 2050 given BAU and good efficiencies.
(http://www.worldenergy.org/documents/scenarios_study_online.pdf )
Ok, I don't know about the 'BAU' and efficiency qualifiers but I agree a world wide doubling of energy demand by 2050 is in line at least with some of US EIA's Outlook predictions, most of that increase coming from the developing world.
apeiron said:
OK, allow peak fossil fuels to be 2020 and the peak to be 520 Ejy, that will mean that on top of new energy to plug the post-peak decline, there will also have to be 420 Ejy extra capacity in 2050.
That's my point above - you are double counting there by at least 50 EJ/yr (110 EJ/yr in case 3) as the fossil peak already counts increased demand.
apeiron said:
Let half of that be nuclear reactors - 210 Ejy.
So if 30 reactors = 1 Ejy (as you said) then that is an extra 6300 reactors by 2050.
That comes to a build rate of 158 a year. (A lesser figure as I've been even more generous with the assumptions).
So 10 + 45 + 158 = 213 new reactors world wide every year to give us BAU (presuming nuclear carries only half the load and the contribution can be matched by other non-fossil fuel sources).
To avoid double counting let's simplify: In 2050 EIA predicted demand is ~940 EJ/yr.* Then, Mohr's 2050 fossil production is ~480 EJ/yr (case 3), so the 2050 demand deficit from fossil decline is 460 EJ/yr. If nuclear is tasked to cover half of that as you propose, then we have 230 EJ/yr * (30 reactors/EJ/yr) over 40 yrs is 173 reactors per year world wide, plus 10 replacements per year.
apeiron said:
[...]Can you supply any evidence to suggest the world can build this many reactors and also manage the waste?
http://www.world-nuclear.org/info/inf17.html
World Nuclear Association said:
It is noteworthy that in the 1980s, 218 power reactors started up, an average of one every 17 days.
http://www.world-nuclear.org/info/inf17.html
Regarding cost for nuclear, this varies considerably by country, another reason why addressing the problem world wide is complicated. In the US yes nuclear capital costs appear to be $5-7 / W(e). However China is throwing up PWBs for
$1.6/W(e), or $1.6B for a one GW(e) reactor (as pointed out by
https://www.physicsforums.com/showpost.php?p=2115378&postcount=115"r)
Xinhua said:
The two generators at Tianwan are expected to produce 2.12 MW each year for east China, which boasts the fastest economic growth in the country.
The construction of Tianwan Nuclear Power Station began in 1999 and has cost 26.5 billion yuan (3.3 billion US dollars). Both generators feature Russian pressurized-water technology.
http://news.xinhuanet.com/english/2006-05/13/content_4542917.htm
apeiron said:
Peak uranium would also be a consideration at this level of building of course.
Eh, peak production of Uranium isotope 235 maybe, otherwise no there's no peak production of fissionable fuels anywhere near 2100.
Wiki said:
The International Atomic Energy Agency estimates the remaining uranium resources to be equal to 2500 ZJ.
(i.e. 2500 years of 1000 EJ/yr production)
*I'm highly sceptical that real demand will reach that high coming from the developing world, that instead efficiencies such a solar water heating, high efficiency lighting, and more efficient aviation (e.g. 787) will leap frog the more wasteful technologies just as the cell phone leap frogged land telco lines in the developing world. But for now I'll accept the doubling prediction of 940 EJ/yr in 2050.