Changjiang-4

Current state

Notes

Verified 2026-09-28: outer dome Apr 2026 (NucNet/CNNC), flushing Jun 2026, control room Aug 2026 and cold tests Sep 2026 (WNN/CNNC). Hydrostatic test Aug 2026 is CINIE-single-source — recorded as medium-grade within a high-confidence file. Both phase-II units due fully operational early 2027; sister unit Changjiang-3 entered commercial operation 2026-09-17 (WNN).

Milestone log

• 2026-06-16 — Listed as under construction in the WNA world table, grid connection estimated 2027 (source)
• 2025-04 — Main circulation pipeline welding completed for Changjiang-4 (source)
• 2026-04-13 — Outer steel containment dome lifted into place at Changjiang-4 (source)
• 2026-06-22 — Nuclear loop flushing begun at Changjiang-4 (prelude to cold/hot testing) (source)
• 2026-08-06 — Secondary-loop combined hydrostatic test completed (witnessed by Huaneng + constructors; prerequisite for cold tests) (source)
• 2026-08-10 — Main control room commissioned (ceremony Jul 31); new stage in commissioning and operation (CNNC) (source)
• 2026-09-08 — Cold functional tests completed; unit officially enters commissioning phase — hot testing, fuel loading and grid connection next (CNNC) (source)

The milestone log is append-only: corrections are recorded as new entries, never rewrites. Full history via /api/v1/changes.

NNN coverage

Sources

1. https://world-nuclear.org/information-library/current-and-future-generation/plans-for-new-reactors-worldwide
2. https://pris.iaea.org/pris/
3. https://www.nucnet.org/news/outer-steel-dome-lifted-into-place-for-china-s-changjiang-4-nuclear-plant-4-3-2026
4. https://www.world-nuclear-news.org/articles/flushing-work-under-way-for-changjiang-unit-4
5. https://www.world-nuclear-news.org/articles/key-commissioning-tests-completed-at-changjiang-4