---
title: "Megatons to Megawatts converted 475.2 metric tons of Soviet weapons HEU into LEU that supplied about one-third of US reactor fuel for two decades"
type: "claim"
status: "seedling"
source_url: "https://www.eia.gov/todayinenergy/detail.php?id=13091"
source_title: "Megatons to Megawatts program will conclude at the end of 2013"
source_author: "U.S. Energy Information Administration"
source_date: 2013
source_quote: "converted 475.2 metric tons of highly enriched uranium into 13,723 metric tons of low-enriched uranium"
source_tier: 1
audit_status: "capture-verified — the capture writer (claude-sonnet-5) read the EIA page at capture time; independent re-check was attempted during this promotion but blocked by web-tool access, so the EIA quotes are carried as captured, not re-fetched verbatim."
writer_model: "claude-opus-4-8"
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-megatons-to-megawatts.md, 2026-07-11"
origin: "batch"
derived_from: "10-inbox/raw/2026-07-09-hop-megatons-to-megawatts.md"
date_created: "2026-07-11T00:00:00.000Z"
tags: ["nonproliferation","nuclear-history","cold-war","commodity-economics","nuclear-power","energy"]
related_notes: ["claim-project-sapphire-1994-airlifted-kazakh-heu-declassified-report","claim-cheap-russian-leu-undercut-usec-american-centrifuge-2014-bankruptcy","claim-microsoft-constellation-tmi-restart-crane-clean-energy-center"]
drafted_in: ["2026-07-13-cheapness-did-both-jobs","cheapness-did-both-jobs","the-same-faint-gas"]
---


The 1993 US–Russia Highly Enriched Uranium (HEU) Agreement, marketed as "Megatons to Megawatts," ran for twenty years (1993–2013). Per the U.S. Energy Information Administration, the program "converted 475.2 metric tons of highly enriched uranium into 13,723 metric tons of low-enriched uranium." The HEU came from dismantled Soviet nuclear warheads; blended down to reactor-grade LEU, it provided "about one-third of the enrichment services needed to fabricate fuel for U.S. nuclear reactors" across that period. The agreement concluded on schedule at the end of 2013.

The structural oddity is that a Cold War disarmament instrument became a load-bearing input to the US civilian power supply: for two decades, roughly one in three US reactors ran — in enrichment terms — on former Soviet weapons material. [[claim-project-sapphire-1994-airlifted-kazakh-heu-declassified-report|Project Sapphire]] was one covert tributary feeding weapons-grade material into this downblending pipeline. The commercial machinery that marketed the Russian LEU into the US market — and the domestic industry it displaced — is treated in [[claim-cheap-russian-leu-undercut-usec-american-centrifuge-2014-bankruptcy]].

That reactor fuel is the same supply chain now under strain as US utilities restart plants like the [[claim-microsoft-constellation-tmi-restart-crane-clean-energy-center|Crane Clean Energy Center]] to meet AI-driven power demand — a reminder that "where does US reactor fuel come from" has been a geopolitically loaded question since the 1990s.

> [!note] Seek's commentary:
> The figure is the payoff of the whole hop chain: a specific, Tier-1 quantitative claim that a nonproliferation program quietly underwrote ~1/3 of two decades of US reactor fuel. It also echoes a pattern the capture kept surfacing — a windfall of scarce material crashing into a market — worth a structural note against the asteroid-mining/PGM-price-collapse cluster if that thread is ever pursued. — Seek