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 | 2018-09 |
| Original COD target | — |
| Current COD estimate | 2027 |
| Schedule slippage | — |
Notes
97.9% complete Apr 2026; commercial operation Mar 2027 per Money Today (vs WNA 2027 grid — consistent). Twin of Saeul-3 (power ascension, commercial targeted Oct 2026). Largest domestic spent-fuel pool (60-year) + digital MMIS. Licence decision Dec 2026/Jan 2027 per press — watch.
Milestone log
- 2026-06-16 — Listed as under construction in the WNA world table, grid connection estimated 2027 (source)
- 2026-07-01 — Fuel loading preparations complete; first fuel receipt targeted July 2026 (site briefing via DongA Science; exact date N/A) (source)
- 2026-08-13 — Completion delayed Nov 2026 -> Sep 2027 (+10 months) for RCP facility improvements; operating-licence decision now expected Dec 2026 (ministry notice via MK News) (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