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Cake day: June 11th, 2023

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  • Vogtle 3 & 4 are AP1000s. Construction started in 2013 (preliminary work had started before this, but a design change halted it). Unit 3 was originally supposed to complete commissioning in 2017, but only happened last year. Unit 4 should be online this year. The initial $12B budget went to $14B at the start of construction, but will end up somewhere over $30B.

    V.C . Summer in South Carolina has a similar project with two AP1000s. The initial budget was $9B, but the project was cancelled while under construction when projections put the total cost over $23B.

    There have been 6 EPRs built, Flamanville-3, Olkiluoto-3, Taishan-1 & 2, and Hinkley Point C (2 units).
    All of them are/were massively over budget and behind schedule.

    Olkiluoto started construction in 2005, was supposed to complete commissioning in 2010, but only came online last year. Costs went from €3B to somewhere over €11B, the contract ‘not-to-exceed’ amount.

    Flamanville started construction in 2007, was supposed to complete commissioning in 2012, but is projected to complete commissioning late this year. Costs went from €3.3B to somewhere over €20B.

    Hinkley Point C is still under construction. It’s difficult to put an actual start date because a pile of preliminary site prep work happened prior to real construction starting. Concrete was poured in 2016 though and it was supposed to be operational in 2023. They’re now estimating 2028 at the earliest. Costs have gone from £16B to and estimated £35B.

    Taishan 1 & 2 started construction in 2009/10 and went online in 2018/19, roughly 5 years late. Unit 1 had to be taken offline for a year due to faulty fuel bundles. Both units have had reliability issues. Costs ended up at the equivalent of $7.5B, almost double the original estimate.


  • I was curious, so I checked to see the current longest ultra-high voltage dc transmission line:

    The Changji-Guquan ultra-high-voltage direct current (UHVDC) transmission line in China is the world’s first transmission line operating at 1,100kV voltage.

    Owned and operated by state-owned State Grid Corporation of China, the 1,100kV DC transmission line also covers the world’s longest transmission distance and has the biggest transmission capacity globally.

    The transmission line traverses for a total distance of 3,324km (2065 miles) and is capable of transmitting up to 12GW of electricity.

    As a general rule of thumb, HVAC lines will be somewhere around 5-6% line loss per 1000kms, and HVDC somewhere around 3%/1000kms



  • People keep saying this, but it’s not accurate.

    An EPR is an EPR, the same with the AP1000. There are only very minor differences between installs, usually things that will help ease of construction or reliability on future builds. Both are GEN III+ designs, greatly simplified compared to previous generations, with fewer pump, valves and pipe-runs. They also shortened pipe runs where possible. They also have large, factory-built assemblies that are shipped to site, ready to “bolt” in, which should have reduced site construction time.

    Where major changes do happen, it’s with the balance of plant infrastructure, which is site dependent. Location of access roads, where the switchyard is installed, where cooling water is accessed , etc will never be the same between sites. Nor will the geotech information. So a lot of mainly civil and structural design and fabrication will always be site specific.

    The KLT-40S reactor is a variant of the KLT-40 reactors developed for and installed in the Taymyr icebreakers back in the late 1980s. It should have been cheap, as it’s a known quantity with a long track record.





  • It makes it sound like these attacks are out of the blue with no justification. The Israelis have been bulldozing civilian homes and stealing their land without repercussion since 1967, not to mention a long history of summary executions and random shootings. This is the type of asymmetrical warfare that should have been predicted.

    The IDF response has been targeting civilians in far higher numbers with completely indiscriminate retaliatory rocket, artillery and airstrikes. The blockade of all humanitarian aid to the West Bank and Gaza, including food, fuel and medical aid will result in widespread civilian deaths. It’s the same tactics used in the Holomodor and in the Warsaw Ghettos, and most definitely war crimes.

    There are no white hats here.




  • KTM did a thing on some models where electronic features, like cruise control, would all be unlocked for the first 1500kms as a trial mode. After that they’d stop working. If you wanted to keep them, you’d pay and the dealer would unlock them.

    I don’t necessarily have an issue with that, as it’s a one time fee, and you only pay for those features that you want. I think people do get upset when they’ve had something and it’s taken away.

    Any sort of subscription is an absolute dealbreaker though.

    Edit. LOL at the downvotes. Reddit will never die.

    Previously KTM had those features behind a paywall. If you wanted them, you’d go to the dealership and they’d unlock them. At least this way you had 1500kms to figure out if they were useful or not. The other option was to just include everything and bump the price up accordingly. KTM were going to get paid for their development work, one way or the other.


  • Just like assuming a perfectly spherical cow, or a frictionless surface, you can completely ignore the economics, the massive cost and schedule overages to make nuclear work.

    Flamanville-3 in France started construction in 2007, was supposed to be operational in 2012 with a project budget of €3.3B. Construction is still ongoing, the in-service date is now sometime in 2024, and the budget has ballooned to €20B.

    Olkiluoto-3 is a similar EPR. Construction started in 2005, was supposed to be in-service in 2010, but finally came online late last year. Costs bloated from €3 to €11B.

    Hinkley Point C project is two EPRs. Construction started in 2017, it’s already running behind schedule, and the project costs have increased from £16B to somewhere approaching £30B. Start up has been pushed back to 2028 the last I’ve heard.

    It’s no different in the US, where the V.C. Summer (2 x AP1000) reactor project was cancelled while under construction after projections put the completed project at somewhere around $23B, up from an estimate of $9B.

    A similar set of AP1000s was built at Vogtle in Georgia. Unit 3 only recently came online, with unit 4 expected at the end of the year. Costs went from an initial estimate of $12B to somewhere over $30B.

    Note that design, site selection, regulatory approvals, and tendering aren’t included in the above. Those add between 5-10 years to the above schedules.








  • Very early on in my career in consulting engineering, I had an architect tee-off on me for changing the ceiling heights of the office space she’d designed.

    I’m electrical, all I was concerned with was circuiting her lights, that was it. I had documentation showing that I’d worked off of exactly the same ceiling heights she had sent me. Heights that she’d apparently changed somewhere along the line without informing the client, who was an international conglomerate, and notoriously picky to work for.

    That could have blown over, had she not berated me over email while CCing the client, my management and just about anyone else involved with the project. I made sure to “reply all” showing where the change had happened. She was replaced on the project the following week.

    After that I stuck to industrial projects, where the buildings were non-descript concrete and steel boxes with no architectural involvement.