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First planned small nuclear reactor plant in the US has been canceled

arstechnica.com

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Re: First planned small nuclear reactor plant in the US has been canceled

#331

Earlier quoted context omitted.

> Weird way to interpret my reply but you do you. Not so weird IMO; I interpreted it the exact same way. So how do you mean it should have been interpreted? GP pointed out that exclusion zones around nukes in effect become nature preserves, and that solar panels could be placed in agricultural zones -- two very different things. In response, you start ranting about "displace wildlife and thus rile up the nature conse…

I think I see where the misunderstanding is now and that there is indeed a gap in my statement. The point I was trying to make here was to challenge the need for nuclear energy _in the first place_ by installing solar in every parking lot. It should be considered and studied more thoroughly, if it hasn’t already. That said, I’m not against nuclear but there are significant environmental drawbacks to it for anyone who…

of course shading a parking lot with solar panels improves the parking lot, but i suspect it won't replace nuclear

(and it's probably more expensive than installing solar on hillsides or in fields, and yields less than installing them in deserts, though those may turn out not to matter)

consider the usa, one of the most parking-lot-intensive countries in the world, with 278 million cars, almost one per person https://www.forbes.com/advisor/car-insurance/car-ownership-s...

0.47% of the contiguous usa is covered in solar panels, 13778 square miles, or in modern units, 35680 square km https://time.com/6239651/solar-parking-lots-france-us/ (that's what the article says, anyway; i suspect the number is smaller, because https://www.sciencedirect.com/science/article/abs/pii/S02648... only found 2.2 parking spaces per registered vehicle in a more-urban-than-average county; 5 m times 2.3 m times 2.2 times 278 million gives only 7000 square km of parking spaces, perhaps doubling if the parking lot covers twice as much area as the parking spaces in it)

with 21% efficient panels, the 35680 km² figure would yield 7.5 terawatts peak; at a high 30% capacity factor it would average 2.2 terawatts, though the time article linked above only estimates 0.422 terawatts peak. possibly the discrepancy is due to oblique illumination: you can't get the full 1000 watts per square meter of insolation on a horizontal surface like a parking lot except in the tropics, where the us isn't. i suspect some of the discrepancy is so large due to an allowance for spacing the panels apart so they never shade each other. also the time article has an arithmetic error where it says half of 13778 is 4822

if we use, say, 14000 km² and a more plausible 18% capacity factor, without trying to take into account angling the panels and spacing them out, we get 2.9 terawatts nameplate capacity, 0.53 terawatts average

the us uses 100 quads per year https://www.eia.gov/todayinenergy/detail.php?id=56980 which is 3.3 terawatts. 0.27 terawatts of this is nuclear

so conceivably you could replace nuclear with parking-lot solar, but you'll need a lot more solar than that to power the rest of the economy

Re: First planned small nuclear reactor plant in the US has been canceled

#332

Earlier quoted context omitted.

The problem is those prices are wrong; they are pricing the hard thing. Renewable sells when it wants to, for dirt cheap. And they don't sell when they don't want to. At that point, today, typically natural gas picks up the ball. Other storage is as much in its infancy as SMRs, as is "demand response". The pricing people compare so favorably isn't pure renewables, it's that renewables + fall back fossil mix.

Renewables have a lumpy profile of energy provided. Nuclear has a flat profile. But demand is also lumpy, so the issues of matching supply to load are basically identical. What do you think France uses all the gas on its grid for? Why do they have excess electricity in the middle of the night that they need to tempt people to use domestically or export to other countries?

My understanding is that newer nuclear is better and ramping up and down? Perhaps SMRs can also help with this too? (e.g. turning on and off individual SMRs as a sort of "dithering".)
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