Russian nuclear equipment and services exporter Atomstroyexport completed the first phase of the Tianwan power plant in eastern China's port city of Lianyungang in September under a 1992 accord.
The new agreement was signed Tuesday by Atomstroyexport and China's state-owned Jiangsu Nuclear Power Corporation during the 12th meeting of the countries' premiers.
Russian nuclear chief Sergei Kiriyenko and Jhang Cinwei, the head of the Chinese committee for defense, technology and industry, signed a protocol to the 1992 agreement to build a gas centrifuge plant to enrich uranium for Chinese nuclear power plants.
Russian state-controlled nuclear fuel and equipment exporter Techsnabexport and China Nuclear Energy Industry Corporation signed a framework agreement on technical assistance for the fourth stage of the plant.
Russia and China, both nuclear powers, are signatories to the Nuclear Non-Proliferation Treaty.