Current state
| Status | Under construction |
| Design | APR1400 (PWR) |
| Net capacity | 1,340 MWe |
| Country | South Korea |
| Vendor | KEPCO E&C |
| Owner / operator | KHNP |
| Construction start | 2026-06-01 |
| Original COD target | — |
| Current COD estimate | 2033 |
| Schedule slippage | — |
Notes
First concrete 2026-06-01, one year after unit 3, following the 2017-2022 policy pause. EPC consortium Hyundai E&C/Doosan Enerbility/Posco E&C; KEPCO E&C design. COD 2033 is the KHNP target per WNN and NEI.
Milestone log
- 2026-06-16 — Listed as under construction in the WNA world table, grid connection estimated 2033 (source)
- 2026-06-01 — First safety-related concrete poured for the reactor building foundation; KHNP targets commercial operation in 2033 (source)
The milestone log is append-only: corrections are recorded as new entries, never rewrites. Full history via /api/v1/changes.
NNN coverage
On the APR1400 design
- US, South Korea outline $120bn plan for eight reactors 2026-10-02
- South Korea nears $100B deal to build eight US reactors 2026-09-11
- South Korea weighs $120B for eight US reactors in tariff pact 2026-09-08
- The 7 nuclear stories that mattered this week 2026-10-03
- The 6 nuclear stories that mattered this week 2026-09-12
Sources
- https://world-nuclear.org/information-library/current-and-future-generation/plans-for-new-reactors-worldwide
- https://pris.iaea.org/pris/
- https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails.aspx?current=KR
- https://www.world-nuclear-news.org/articles/construction-starts-for-shin-hanul-unit-4
- https://www.neimagazine.com/news/shin-hanul-4-construction-starts/