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Reactor Internals Lifted Into Place At China’s Haiyang-4 Nuclear Plant

By Kamen Kraev
3 July 2025

Construction of indigenous CAP1000 unit began in 2023

Reactor Internals Lifted Into Place At China’s Haiyang-4 Nuclear Plant
The reactor internals set has been lifted into place at Haiyang-4 in China. Courtesy CNEA.

The reactor internals set has been lifted into place for Unit 4 of the Haiyang nuclear power station under construction in Shandong province, eastern China.

The China Nuclear Energy Association (CNEA) said the operation took about two and a half hours to complete on 24 June.

Reactor internals are structures inside a nuclear reactor’s pressure vessel that support, guide and contain the nuclear fuel assemblies, control rods and coolant flow. They consist of an upper and a lower section.

The CNEA said the equipment weights about 260 tonnes in total.

Haiyang-4 is a 1,161-MW CAP1000 pressurised water reactor, China’s Generation III indigenous version of US-based Westinghouse’s AP1000 design. It is being built by the State Power Investment Corporation.

Construction of Haiyang-4 began in April 2023. A twin unit, Haiyang-3, has been under construction the site since July 2022.

China currently has eight CAP1000 plants under construction including Haiyang-3 and -4. Two units are also officially being built at each of the Sanmen, Lianjiang, and Xudapu sites.

Construction of two CAP1000 units, Lufeng-1 and -2, in the southern province of Guangdong, was approved in August 2024.

Though not yet listed in the International Atomic Energy Agency’s reactor database, earlier reports said construction of Lufeng-1 began in February 2025.

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