Melt trap body installed at unit 8 of China’s Tianwan NPP

28 October 2022

The body of the melt trap has been installed at unit 8 of the Tianwan NPP, which is under construction in China, according to China National Nuclear Corporation (CNNC). This signals the beginning of the installation of the main equipment of the nuclear island. The 6.1 metre high and 156-ton body is the main part of the core trap, which is designed to contain molten core material in the event of a possible emergency in order to prevent the release of radioactive material outside the containment. Other components of the melt trap are cassettes filled with special non-metallic materials, a service platform, a cantilever truss, and a foundation slab.

The construction of unit 8, with a Russian VVER-1200 reactor, officially began on 25 February when first concrete was poured. The agreement for construction of Tianwan 7&8 as well as well as Xudabu NPP units 3&4 was signed by Russian President Vladimir Putin and Chinese President Xi Jingping in June 1918. The commissioning of units Tianwan 7&8 is scheduled for 2026-2027.

Tianwan NPP is owned and operated by the Jiangsu Nuclear Power Corporation, whose shareholders are CNNC (50% stake), China Power Investment Corporation (30%) and Jiangsu Guoxin Group (20%).

Currently, six units are operating at Tianwan NPP: units 1-4 with Russian design VVER-1000 reactors, commissioned between 2007 to 2018, and units 5&6 with Chinese ACPR-1000s, commissioned in 2020 and 2021.

Image: The body of the melt trap is hoisted into place at Tianwan 8 (courtesy of CNNC)

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