Crews poured concrete without a pause for almost 39 hours, to lay the turbine island of one more reactor at a Chinese plant designed to reach 8.62 gigawatts across six units

On the Jiangshan Peninsula in southern China, a line of pump trucks lines up beside a freshly dug pit.

They begin to pour, and they do not stop.

For the better part of two days the gray stream never breaks, hour after hour into a mat of steel.

The gulf offers effectively unlimited cooling water, so these reactors never face the low river flows that can throttle inland plants in a drought.

By the time the last load settles, a foundation slab has been laid in a single pour.

It is the base for the second unit’s turbine hall, at a plant meant to hold six machines.

Why does a nuclear project open with almost 39 hours of pouring that cannot pause?

Why the pour cannot stop for 39 hours

The slab under a turbine hall is not ordinary concrete. It carries the full weight of the spinning turbines, condensers and generators that turn heat into power, and any weak seam in it can travel upward through decades of vibration and load.

The enemy is the cold joint.

Stop the pour and let a batch harden, and the next load meets a stiff face it cannot fully bond to, leaving a cold joint, a hidden line of weakness that no later repair can truly close. To avoid it, the entire slab has to go in as one continuous mass, which is why the trucks run without pause.

Heat is the other problem. A mass of curing concrete warms from the inside and can crack as it cools unevenly, so crews pour in a planned sequence of zones, letting each patch begin to set while the next is filled, and that skip pattern is how they fight cracking at this scale.

A peninsula chosen for deep water and the sea route

The location is no accident. The Jiangshan Peninsula pushes out into the Beibu Gulf at the far southwestern corner of China’s coast, roughly 15 miles from the Vietnamese border and close to an existing nuclear plant at Fangchenggang.

The sea does two jobs here.

The gulf offers effectively unlimited cooling water, so these reactors never face the low river flows that can throttle inland plants in a drought. It also gives deep water access, which matters because the heaviest reactor parts arrive far more easily by sea than by road.

That coastal setting shapes the whole build. A plant that can float in its largest components and draw seawater to cool them is simpler to supply than one stranded inland, which is part of why this shore was picked.

Two pours, and a reactor born in Westinghouse’s labs

The numbers tell the pace. The August work placed 1,732 cubic meters of concrete over 38 hours and 46 minutes for the second unit’s turbine island, and it followed a bigger pour months earlier.

Unit one came first, and heavier.

Its nuclear island took first concrete in late December, a 6,662 cubic meter pour lasting just over 64 hours, more than the turbine base because the reactor building itself demands a deeper, stronger foundation. Both units are CAP1000 machines, China’s own version of the Westinghouse AP1000, built under a technology transfer deal.

Each of the first two reactors is rated at 1.25 gigawatts, and together they are designed to generate about 20 billion kilowatt hours a year, on the way to a planned six unit complex of 8.62 gigawatts, the output of a midsize country.

Four bigger reactors still waiting in the queue

Two units are just the opening. Plans call for four more reactors, 3 through 6, built around a larger design of roughly 1.5 gigawatts each, which alone would add nearly as much capacity as the first phase, echoing the pace at other Chinese sites like the Zhaoyuan build.

The money and the clock are the real tests.

The first two units carry a price around 40 billion yuan, close to 5.6 billion dollars, and the target is about 56 months from first concrete to the grid, a schedule that would embarrass most Western projects and that assumes nothing slips, as the official update makes clear.

The later reactors are not locked in. Their construction dates stay unconfirmed and depend on how the first phase performs, and a plant sitting 15 miles from Vietnam needs steady diplomatic coordination with a neighbor whose own grid is growing fast.

One slab in a build no one else can match

Bailong is one piece of something much larger. China is adding reactors faster than any other country, having just approved ten more, and it accounts for a large share of every reactor under construction on Earth.

The scale is the story.

What execution looks like at industrial scale is exactly this, standardized reactor programs, a settled supply chain and pours measured to the hour, which is why one slab in Guangxi connects to a build stretching across the country and beyond.

The honest caveat is that a foundation is only a foundation. The 56 month target is a target, and nuclear megaprojects have humbled fast schedules before, so while the base at Bailong is real and already rising, the reactor it will carry is still years from the grid.

Hugo Rojas

Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.