Successful cold testing of Tianwan Nuclear Power Unit 8

Forum Contacts RSS		RUSSIAN

CNNC, PUBLISHED 27.08.2026

On August 3, Unit 8 of CNNC's Tianwan Nuclear Power Plant, invested in and operated by China National Nuclear Power Co Ltd, a subsidiary of CNNC, successfully completed its cold functional test. This marks the unit's transition from the installation phase to the commissioning phase, laying a firm foundation for subsequent hot functional testing and fuel loading.

Cold functional testing is a major integrated commissioning procedure for nuclear power plants. It verifies the performance of the primary circuit system, equipment and auxiliary pipelines under high pressure, with relevant tests conducted on the main and auxiliary systems at various pressure levels. It serves as the first comprehensive "health check" of reactor performance.

Construction of Unit 8 officially began on February 25, 2022. Key milestones, including dome lifting, main pipeline welding, and cold functional testing, have been completed. Next, the unit will undergo containment pressure testing, hot functional testing, fuel loading, criticality testing, turbine start-up, grid connection and tests at various power levels.

To date, Tianwan Nuclear Power Units 1–6 have maintained safe, stable and efficient operation, with more than 500 billion kWh of electricity safely supplied to the grid. Their long-term safety and operational performance rank among the best for similar units worldwide.

Once Units 7 and 8 are fully operational, the Tianwan Nuclear Power Plant will generate 18.8 billion kWh of electricity annually, equivalent to reducing CO? emissions by 15.34 million metric tons each year. This will help accelerate the decarbonization of energy-intensive industries in Jiangsu and strengthen energy security for the East China power grid and the wider region.

Topics: Commissioning, Asia, China, NPP Tianwan

Other news:

Construction of first NPP in Uzbekistan is launched

Ceremony marked pouring of first concrete.

Rosatom Enters Indian Market of Additive Manufacturing

RusBeam 2800 industrial 3D printer has successfully supplied.

Rosatom provides first nuclear fuel shipment to Xudapu NPP

Initial fuel loading for the VVER-1200 reactor at Unit 3.

Hero of the day

Welding of Primary Coolant Piping Completed at Akkuyu-2

The welding was completed in 73 days - the time required to carry out welding operations on all 32 pipe joints.

INTERVIEW

Rosatom
On November 18, in St. Petersburg, President of Russia Vladimir Putin took part via videoconference in the keel-laying ceremony for the Project 22220 sixth serial-produced universal nuclear-powered icebreaker Stalingrad.

OPINION

CNNC
On July 12, China National Nuclear Corporation (CNNC) achieved a milestone at the "National No 1 Uranium" demonstration project in Ordos, Inner Mongolia autonomous region, producing its first barrel of uranium product.