Nuclear & Arms Control — 2026-04-29

Satellite Imagery Shows North Korea Actively Producing Plutonium at Yongbyon in Seventh Reprocessing Cycle

Planet Labs satellite imagery captured between April 18 and 25 reveals continued steam emissions and water discharge at North Korea's Yongbyon nuclear complex, now in its seventh fuel irradiation and reprocessing cycle since October 2024. IAEA Director-General Grossi confirmed on April 15 that the complex's facilities were active, stating that production capacity appears sufficient to produce dozens of warheads. New construction including a suspected uranium enrichment facility and residential buildings points to long-term expansion of the weapons program.

Analysis
The seventh consecutive reprocessing cycle since October 2024 signals a shift from episodic coercion to continuous stockpile growth. IAEA Director-General Grossi's April 15 confirmation that Yongbyon's capacity is sufficient for dozens of warheads gives institutional weight that imagery alone cannot establish. Per a single Radio Free Asia report drawing on Planet Labs satellite data, new construction includes a suspected uranium enrichment facility that would, if operational, add a second fissile material track. Completion within 12 months is unlikely, with comparable Yongbyon expansion taking 12-24 months from initial detection. The accelerated cycle pace may instead reflect reactor fuel management constraints rather than a deliberate push to maximize weapons-grade output.

2 sources

Satellite imagery reveals increased activity at North Korean nuclear complex - Radio Free Asia
Suspected Uranium Enrichment Building at Yongbyon Complete - CSIS Beyond Parallel