The event nobody saw coming

Below the control room at Browns Ferry there is a space called the cable spreading room, where thousands of electrical cables fan out from the panels above and run through the wall into the reactor building. The gaps around them were packed with polyurethane foam.

Two men were checking those seals for air leaks. The accepted method — the method everyone used, the method nobody questioned — was to hold up a lit candle and watch which way the flame bent.

The flame found the foam. They tried to beat it out and pushed it deeper into the wall instead. The fire got into the cable trays and traveled through into the reactor building, and it burned for roughly seven hours.

Somewhere around 1,600 cables were destroyed. Six hundred of them were safety cables. In the control room, indicator lights went dark and dead in banks, and the operators of Unit 1 discovered they had lost the emergency core cooling system entirely — the pumps, the controls, the ability to know what was happening. They kept water on the core by improvising with pumps that were never intended for the job.

Browns Ferry had defenses against every accident anyone had modeled. It had no rule about candles. Five years later the NRC published Appendix R, and fire protection became a nuclear engineering discipline, because two men had gone looking for a draft.

At four in the morning, a blockage in a water-cleaning system shut down the feedwater pumps at Three Mile Island Unit 2. The turbine tripped. The reactor scrammed. All of that was normal. All of that was designed for.

Pressure spiked, and a relief valve on top of the pressurizer opened to vent it, exactly as intended. Then the valve stuck open. Reactor coolant began pouring out of the top of the system, and it kept pouring for more than two hours.

In the control room there was a light for that valve. The light was wired to the signal telling the valve to close — not to the valve. The signal had been sent. The light was off. As far as every man in that room could tell, the valve was shut.

What they saw instead was rising water level in the pressurizer, and they had been trained their entire careers never to let the pressurizer fill solid. So they did the responsible thing: they throttled back the emergency cooling water that the plant was automatically injecting into the core.

They starved the reactor to satisfy an instrument. About half the core melted. The containment held, and almost nothing got out, and it did not matter at all — the industry's future was decided anyway. Reactor orders stopped. And twelve days earlier, a film called The China Syndrome had opened in theaters, in which a fictional meltdown renders an area "the size of Pennsylvania" uninhabitable.

For years, crews at Davis-Besse had been cleaning a reddish-brown crust off the top of the reactor vessel. It was on the head, it was around the control rod nozzles, and there was a lot of it. They scraped it, they logged it, they called it rust, and they went home.

It was boric acid. It had been weeping out through cracks in the nozzles, and it had been eating the reactor vessel head — six and a half inches of carbon steel — for something on the order of six years.

In March 2002, an inspector put a tool into what he thought was a shallow pit, and it kept going. When they opened it up they found a cavity roughly the size of a football, corroded clean through the steel. What was left holding back the primary coolant system, at over two thousand pounds per square inch, was a stainless steel liner about three-sixteenths of an inch thick. It was already bulging outward.

The plant had been passing its inspections. Every one of them. The rust was not hidden. It was on the head, in plain view, for years, and it was catalogued and cleaned and dismissed, because nobody asked the one question that mattered: where is this coming from?

The NRC later called it the most serious safety issue in the United States since Three Mile Island.

San Onofre spent roughly $700 million on new steam generators. The point was to extend the plant's life — twenty more years of clean baseload for Southern California. The new generators were bigger, with more tubes, and the design changes altered how steam and water moved inside them.

Within a year the tubes were rubbing against each other and wearing through. On January 31, 2012, one of them ruptured. When they went in and looked, they found wear across thousands of tubes in machines meant to last decades. The plant never generated another watt. In 2013 it was retired permanently — 2,200 megawatts gone, killed by the thing that was supposed to save it.

Crystal River in Florida died the same death, from the opposite direction. To swap its own steam generators, the utility decided to cut the opening in the containment building itself rather than hire the contractor who had done it elsewhere. It would save money. They cut into forty-two inches of prestressed concrete, and the wall delaminated — the layers separated. The repair induced new cracks in other sections. The estimates climbed into the billions with no guarantee it would ever work again.

The plant had sixteen years left on its license. It was retired without ever restarting.

Now the important one, because it is the only one on this page that was not an accident.

Kewaunee ran perfectly and had a license good until 2033. It closed in 2013 because Dominion could not find a buyer. Vermont Yankee closed in 2014. Fort Calhoun in 2016. Oyster Creek in 2018. Pilgrim in 2019. Indian Point, which powered New York City, in 2021. Palisades in 2022.

And in September 2019, Three Mile Island Unit 1 — the good one, the twin that never had a bad day, that ran safely for forty-five years — shut down because it could not clear a capacity auction.

Not one of these plants melted down. Not one of them failed an inspection. They were safe, paid off, and carbon-free, and they were scrapped because natural gas got cheap and a spreadsheet said so.

The industry spent forty years hardening itself against a meltdown, and lost half its fleet to a price on a screen in Louisiana.

And then the price moved again. Palisades is being brought back — the first restart in American history of a plant already in decommissioning. Three Mile Island Unit 1 is being relicensed to feed data centers. The plant that was worthless in 2019 is worth restarting in 2026, and nobody saw that coming either.