Time lapse of 83-day Sequoyah Unit 2 Steam Generator Replacement

This is just one of the coolest things I’ve ever seen.

In 2002, Tennessee Valley Authority (TVA) successfully received approval from the NRC for a 1.3 percent power uprate. Just two weeks ago on January 15th, TVA applied for license renewal. And now the steam generators necessary to transform 3,455 mega-watts to steam for another 20+ years are in place and pumping up the POWER!

sequoyah 1and2

TVA replaced all 4 steam generators at Sequoyah Unit 2. Crane operators be warned, this might make you H-O-T!!!

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Author: NuclearGrrl

Nuclear engineer, afro queen, black mamba, feminist, clinic escort, beer aficionado and all around spectacular human being.

4 thoughts on “Time lapse of 83-day Sequoyah Unit 2 Steam Generator Replacement”

  1. That’s so cool! The biggest crane dwarfs the reactor building!
    I’m surprised that so much of what looks like the most critical work is done at night. I’d expect the NRC to allow that work only being done during the day shifts when people are, in general, more alert.

    1. Well, there are a whole population of people that work at night. Plus, power plants are in production 24/7 during normal operations since the demand for power never stops. It makes sense that they would maintain 24 hr operations during an outage – especially when it is costing them $1 million /day.

      My father worked third shift all my life until he retired. I worked third shift for a while. I had no problem with weariness. In fact, on my days off, I stayed up all night and baked cakes! There was nothing on tv, and nothing else to do. The guy at the grocery was always so envious!

      1. Oh, I know there are many in the 24 hours economy that work night shift. And I understand completely that the utility wants to keep their outage as short as possible. I was just surprised that the NRC allows it, with their extreme focus on safety, with no regard for the costs for the utility.

        I’ve never worked night shift myself, but my OH, a train driver, has, and he and many others I know experience loss of concentration and fatigue during their shift. My OH says it was like a permanent jet lag in the end.
        Some people have no problems with it, others have, so I think night shift is best done voluntarily. Especially in jobs where safety is important, so it will be done by the ones who have no problems staying alert.

      2. I guess the only thing I can add is that, no one is working for the company involuntarily. There are traveling nuclear workers and construction workers that work third shift on a regular basis. Some people just aren’t built for third shift. Personally, I really liked it, and didn’t feel tired at all. But for some, it could be a bad fit.
        However, having work done at night doesn’t affect safety. The way these steam generators are put in, there are quality assurance measures to ensure the plant is built to spec. For instance, just because they are moving the generators at night doesn’t mean safety is compromised. The generators have to be welded onto the reactor coolant system hot and cold legs. That welding operation is witnessed by a QA engineers and by regulators, and the welds are inspected with special mechanical and analytical techniques. What would be unsafe is for the generators to be installed without all of these quality assurance measures. It’s really quite an operation!

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