Once you build the plant, any emissions from running it are absolutely minuscule. Gasoline maybe from the employees driving to work, maybe a bit from maintenance.
No wind uses more. You need to mine for the raw materials used to build the wind turbine.
For the equivalent amount of energy wind turbines use hundreds of times as much raw materials as nuclear - even including building the nuclear power plant, not just the uranium.
Do you have a citation for that? The only source for that I found is http://www.world-nuclear.org/education/comparativeco2.html, which is most probably biased. Most other sources seem to rank wind better - but not sun (maybe you are mixing those two up?).
500 tons of materials for 1MW (actual) wind turbine.
That would imply a 1GW reactor should be less than 500,000 metric tons in order to use less materials, and while I can't find figures for the weight of a nuclear reactor, they certainly are not that large!
500 tons, for 100MW - meaning 100 times as much material is used for a wind turbine compared to thorium. Uranium uses larger buildings, but still much less than wind.
1) are the raw materials the same raw materials? (Iron is easier to get than tungsten for instance). Are the materials used in either type of generation actually hard to find or in danger of becoming scarce?
2) How much extra energy is spent on processing the raw materials to the finished product? The vast majority of weight in a turbine is the tower, which is relatively simple to build compared to the thousands of miles of piping welded together in a nuke plant. Even if weight of resources/watt of generation was a good measure, you are not factoring the weight of a) fuel to create energy consumed in manufacture, and b) weight of wasted resources in the refining and manufacture processes.
3) How reusable is the material base? How much of a nuke plant can be used to create the next plant? Presumably a wind down can have it's turbine or airfoils replaced independently of the tower structure itself, reducing tco. (and total resource consumption).
4) Your analysis is not including weight of energy production fuel put in, nor the weight of all resources needed for dealing with post energy production waste (not insignificant in nuclear waste storage).
Most of a nuclear plant is concrete (the containment building) and iron (the reactor body). And both those materials are easy to get. The pipes are minor in comparison (in terms of materials, not in terms of construction). There isn't much if any tungsten used in a reactor, it's all ordinary iron, copper, concrete, etc.
In contrast a wind turbine uses hard to get neodymium rare earth magnets.
Nuclear plants don't require exotic materials.
2:
It's about the same for nuclear plants and wind turbines - you make a mold and pour the concrete. You might have thousands of miles of pipe, but you also produce a thousand times as much energy.
Not much waste in either during manufacturing - any extra metals are reused, and the concrete is poured in place. So it's about the same for turbines/nuclear plants.
> weight of resources/watt of generation was a good measure
It's an approximation of how much resources are needed (mining, energy, etc). We are worried about CO2, but mining also causes pollution, and uses energy.
3:
In a turbine it's the tower and blades both that need to be replaced due to material fatigue. The generator can be reused. The tower is wasted (it's poured concrete). The blades can be melted down, but they are light, and it's not a lot of metal - making them is the hard part.
We've never reused a nuclear plant (that I know of), so it's hard to say what would happen there.
They last a lot longer than wind turbines though, in the range of a 100 years vs 20.
Most likely the nuclear core would be removed, and the building reused for the next power plant. The building itself doesn't wear out, but they might redo the control equipment (pipes, wires, all very recyclable stuff).
4:
The weight of the fuel is tiny - less than 100 tons of fuel for a 1GW reactor, and it lasts around 10 years. That's equivalent to a couple of bolts on a wind turbine (which produces 1/1000 of the energy).
Waste is troublesome, but doesn't use a lot of materials. It's about one semi trailer load - every 10 years, for a plant that produces 1000 times as much as a turbine (which also fits on a semi).
I wasn't. It's a calculation of resources used in construction, not emissions which is a different issue.
I was saying that wind might have no emissions, but you still use lots and lots of resources in building it, so you have to include those when analyzing environmental impact.
Also a working nuclear "you already paid for"-plant costs money and produces carbon emissions.