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💧simon holmes à court 🍩 Profile picture
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27 Jan, 4 tweets, 3 min read
#nuclear twitter: super niche question, but i'm trying to find out the mass of fuel in a CE 16x16 assembly (such as used by palo verde).

this ancient doc claims the assembly weighs 650kg, but of course, only part is fuel.

osti.gov/servlets/purl/… Image
a nuke expert i consulted provided this estimate based on the spec sheet above:

ie. 551 kg/assembly Image
that estimate looks pretty good… though it ignores the pellet's dimples and chamfers, and the gap between pellet and cladding.

anyone have actual data? 🙏

@energybants @whatisnuclear @6point626 @Gen_Atomic ImageImage
…i'm trying to work out how many assemblies for 27.6t UO2. Image

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More from @simonahac

💧simon holmes à court 🍩 Profile picture
30 Jan
🧵 my theory is that everybody knows they're being lied to, but few have the time to find out just how. i'm here to help.

here's how @mattjcan🤥 is lying to you:

#1. he says "gas _now_ sets australian electricity prices". the truth is it has for years… Image
…gas generation in the NEM hit a 15 year low last year, yet it still plays a major role in setting the price.

why? because coal and hydro plants "shadow price" gas.

ie. they set their bids just below the cost of gas to maximise their profits.

see
Image
#2. @mattjcan🤥 tries to make a connection between rising gas prices and blackouts in sydney.

that's just soooo wrong!

these blackouts were due to problems in the distribution network ("poles and wires").

there have been no incidents of load shedding in NSW recently. Image
Read 8 tweets
💧simon holmes à court 🍩 Profile picture
15 Dec 20
ok @DaveSharma i promised i'd explain why your tweet is nonsense & why you shouldn't repeat it.

👇here's #australia vs #newzealand relative emissions since 2005:
• australia ⬆️ 6%
• new zealand ⬇️ 3%

(you'll notice that LULUCF is excluded…)
why is LULUCF (land-use, land-use change & forestry) excluded?

1. measurement methodologies aren't standard between countries & frequently change — no robust method to compare countries
2. annual fluctuations are high / noisy

data: PRIMAP-hist v2.1
pik-potsdam.de/paris-reality-…
3. the vast majority of australia's LULUCF variation is driven by changes to QLD land-clearing laws, a function of state political tussles, and nothing to do with commonwealth policy.
4. australia is famous for using LULUCF as a fudge, see @MichaelM_ACT:

medium.com/@MichaelM_ACT/…
Read 8 tweets
💧simon holmes à court 🍩 Profile picture
24 Nov 20
🧵 many #nuclear hopes are riding on small modular reactors.

@NuScale_Power's #SMR is closest to market. customer for pilot plant is a group of utilities, herded by @SmartEnergy1.

in july only 213 of 720MW (30%) was subscribed.
subscriptions have since dropped to 104MW (14%)…
of the 36 towns in #nuscale's pilot project, the "carbon free power project" #CFPP:
• 8 towns have withdrawn entirely
• 24 reduced their share entitlement
• 3 maintained identical entitlement
• 1 joined (token level).

utah.gov/pmn/files/6554…
with the planned 12 module plant undersubscribed, #nuscale is now looking at downsizing to either 4 or 6 modules.

counteracting this fall of subscriptions, nuscale has uprated modules from 60MWe to 77MWe each.

as such, nuscale now has 33% subscriptions for a 4 module plant…
Read 5 tweets
💧simon holmes à court 🍩 Profile picture
11 Nov 20
🤓 gather round for a little yarn about #australia's remarkable, accelerating energy transition. 🧵

just 3 years ago #AlanFinkel @ScienceChiefAu was tasked to review the national electricity market (NEM).

he recommended that AEMO prepare an #IntegratedSystemPlan every 2 years.
the #ISP has 5 core scenarios…

don't think of a scenario as a prediction, but rather a set of constraints/assumptions and the cheapest path found to supply power within those constraints.

let's talk about the 'step change' scenario.
'step change' is the closest to being compliant with the paris agreement — ie. a half-decent start if we want to keep the great barrier reef, not destroy civilisation etc.

it gets us to 96% renewables in 2042.

(the central 'business as usual' scenario is a few years slower.)
Read 17 tweets
💧simon holmes à court 🍩 Profile picture
28 Oct 20
check out the reduction in minimum demand in south australia…

from @AEMO_Media's QED Q3 report
lowest Q3 electricity prices since 2014:
spot prices are down 👇
Read 17 tweets
💧simon holmes à court 🍩 Profile picture
21 Oct 20
🧵the sloppy advocacy of #nuclear zealots

earlier this year adelaide-based nuclear lobby group @BNW_Aus submitted this chart (sans emoji) to the #victorian parliamentary inquiry into #nuclear prohibition.

one problem: it’s 🐂💩!
.@BNW_Aus claims to be an environment group, yet *all* they seem to do is fight against australia’s nuclear bans.

i’ve no problem with nuclear advocacy — nuclear technology is pretty amazing & we should keep our minds open — but why not just be honest & admit your sole purpose?
the chart aims to show that nuclear is awesome because it’s just so thrifty.

BNW's GM @dayne_eckermann says it’s relevant because “you need materials mined from the ground to make things. it's better if we limit that as much as possible to protect the environment”.

fair enough.
Read 30 tweets

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