Qualla: HTR-PM

HTR-PM: Introduction

Sat, 14 Mar 2026 00:00:00 GMT

What if a nuclear reactor could not melt down, even if you tried? In December 2022, engineers at a power plant on the Shandong coast deliberately cut all power to the HTR-PM reactor -- no emergency cooling, no human intervention, no backup systems. The reactor's temperature rose, then stabilized, then began to fall on its own. The laws of physics, rather than engineered safety systems, brought the reaction to a halt. It was the first time any commercial nuclear power plant had demonstrated this kind of inherent safety, and it happened at a facility that had been decades in the making.

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HTR-PM: Pebbles Instead of Rods

Sat, 14 Mar 2026 00:00:00 GMT

The HTR-PM is not a conventional nuclear reactor. Instead of fuel rods submerged in water, it uses approximately 400,000 billiard-ball-sized graphite spheres, each containing thousands of tiny uranium particles coated in layers of ceramic and carbon. These 'pebbles' flow continuo...

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HTR-PM: A Core That Cools Itself

Sat, 14 Mar 2026 00:00:00 GMT

The reactor's most remarkable feature is what happens when things go wrong. The core is only 3 meters in diameter and 11 meters tall -- small enough that if all coolant is lost, the decay heat dissipates naturally through the reactor vessel walls by convection and radiation, with...

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HTR-PM: Two Decades from Concept to Grid

Sat, 14 Mar 2026 00:00:00 GMT

The path from idea to operating power plant was long and winding. China launched the HTR-PM demonstration project in 2001, building on experience with the smaller HTR-10 prototype reactor at Tsinghua University. Construction at the Shidao Bay Nuclear Power Plant in Shandong provi...

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HTR-PM: Replacing Coal, One Module at a Time

Sat, 14 Mar 2026 00:00:00 GMT

The HTR-PM is explicitly designed to replace coal-fired power plants in China's interior, supporting the country's goal of reaching carbon neutrality by 2060. Its modular design is the key: rather than building enormous, one-of-a-kind reactors that take a decade to construct, the...

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