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The linked article is about China's successful meltdown test of its pebble-bed nuclear reactor. The test demonstrated the reactor's ability to withstand a loss of coolant accident without melting down, a key safety feature of the design. The pebble-bed reactor is a type of high-temperature gas-cooled reactor that uses spherical fuel elements instead of traditional fuel rods, which enhances its safety and efficiency. The successful completion of this meltdown test is a significant milestone for China's nuclear energy program and its efforts to develop safer and more advanced reactor technologies.