{"docs":"https://www.nuclearnewsnetwork.com/tracker","terms":"History surfaces — append-only milestone logs, event/change feeds, and full JSON snapshots — are provided under the NNN Data License Terms (https://www.nuclearnewsnetwork.com/data-license): journalism, research, citation and AI answering are expressly permitted royalty-free with attribution; systematic bulk extraction, dataset redistribution, and embedding in commercial products or training corpora require a commercial license.","terms_url":"https://www.nuclearnewsnetwork.com/data-license","attribution":{"text":"Nuclear News Network, \"NNN Reactor Project Tracker\", https://www.nuclearnewsnetwork.com/tracker","url":"https://www.nuclearnewsnetwork.com/tracker"},"unit":{"slug":"mochovce-4","name":"Mochovce-4","plant":"Mochovce","unit":4,"country":"SK","region":"europe","reactor_type":"PWR","design":"VVER-440/V-213","capacity_mw_net":440,"is_smr":false,"vendor":"Škoda/Rosatom lineage","owner_operator":"Slovenské elektrárne","status":"commissioning","construction_start":1987,"original_cod_target":null,"current_cod_estimate":2026,"milestones":[{"date":"2026-06-16","event":"Listed as under construction in the WNA world table, grid connection estimated 2026","source":"https://world-nuclear.org/information-library/current-and-future-generation/plans-for-new-reactors-worldwide"},{"date":"2026-06-29","event":"First fuel assembly loaded into the reactor at 15:45 local time, beginning fuel load (operator announcement via WNN, 2026-06-30)","source":"https://www.world-nuclear-news.org/articles/fuel-loading-begins-at-slovakias-mochovce-4"},{"date":"2026-07-20","event":"Reactor assembly and sealing completed; unit entered physical start-up tests preceding first criticality (Slovenske elektrarne via WNN)","source":"https://www.world-nuclear-news.org/articles/mochovce-4-reactor-assembly-completed"},{"date":"2026-08-05","event":"First criticality reported (NucNet, published 2026-08-07 with 2026-08-05 dateline); single trade-press source so far - awaiting Slovenske elektrarne / IAEA PRIS confirmation","source":"https://www.nucnet.org/news/slovakia-s-mochovce-4-nuclear-power-plant-reaches-first-criticality-8-5-2026"}],"sources":["https://world-nuclear.org/information-library/current-and-future-generation/plans-for-new-reactors-worldwide","https://www.world-nuclear-news.org/articles/fuel-loading-begins-at-slovakias-mochovce-4","https://www.world-nuclear-news.org/articles/mochovce-4-reactor-assembly-completed","https://www.nucnet.org/news/slovakia-s-mochovce-4-nuclear-power-plant-reaches-first-criticality-8-5-2026","https://pris.iaea.org/pris/","https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails.aspx?current=SK"],"last_verified":"2026-08-09","verified":true,"confidence":"medium","notes":"Soviet-era start; completion resumed decades later - unit 3 entered service 2023. Fuel load began 2026-06-29; physical start-up tests from 2026-07-20; first criticality reported 2026-08-05 by NucNet but not yet confirmed by a second independent source (operator press page and PRIS not yet updated) - confidence medium until confirmed. Grid connection and 144-hour demonstration run still ahead; COD estimate 2026 unchanged.","tags":["sk","vver-440"],"updated_at":"2026-08-09","slippage_years":null}}