Haiyang Unit 3 Completes Cold Functional Tests

Cold functional tests finished at Haiyang 3, confirming safety readiness – State Power Investment Corporation announced that unit 3 of the Haiyang nuclear plant in Shandong completed cold functional tests, verifying that safety‑critical components are correctly installed and ready for operation in a non‑thermal condition [1].

Leak‑tightness and pipe cleaning verified across primary circuit – The tests checked the integrity of pressure vessels, pipelines, and valves in both nuclear and conventional islands, confirming leak‑tightness and cleaning of the main circulation pipes, marking the first joint operation of reactor and auxiliary systems [1].

SPIC reports pumps, converters and pressure boundary performed normally – The corporation said the four main coolant pumps and their domestically produced frequency converters operated normally, the primary loop pressure boundary integrity was good, and equipment installation quality was excellent, with the test succeeding on the first attempt [1].

Success sets stage for hot tests and fuel loading ahead of 2027 target – Completion of cold tests provides a solid foundation for subsequent hot functional testing, reactor fuel loading, and high‑quality commissioning, aiming for full operation of units 3 and 4 by 2027 [1].

Construction milestones reached: concrete poured 2022, dome installed 2023, Haiyang 4 started 2025 – The first safety‑related concrete for Haiyang 3 was poured in July 2022, the outer steel dome was hoisted in March 2023, and construction of unit 4 began in April 2025; both units have a 56‑month build schedule [1].

State Council approved new CAP1000 reactors at Haiyang, Sanmen and Lufeng in 2021 – In April 2021, China’s State Council approved two additional reactors at each site, including Haiyang units 3 and 4, which are CAP1000 designs—the Chinese version of the Westinghouse AP1000 [1].