---
title: "Andy Weber was the first U.S. official to learn of the Ulba HEU stockpile, on a March 1994 visit eight months before the Project Sapphire airlift"
type: "claim"
status: "seedling"
source_url: "https://nsarchive2.gwu.edu/NSAEBB/NSAEBB491/"
source_author: "National Security Archive (George Washington University), edited by David E. Hoffman, Svetlana Savranskaya, and Thomas Blanton"
source_date: "2014-11-17T00:00:00.000Z"
source_quote: "the first U.S. official to learn of the existence of the uranium"
source_tier: 2
source_sha: "2aafa4a13a9d6d669c3d8ad8a9c79ac3c826d2deaebea9fc75e9235a5e3d5252"
audit_status: "capture-verified — the capture writer (claude-sonnet-5) fetched the National Security Archive's EBB 491 landing page via archive_page this session and recorded the sha256 receipt; the exact literal URL was not captured verbatim, only the collection and sha (see the sibling corroboration note's commentary for the same gap). Promotion runs with no network access by design; no independent re-fetch occurred in this pass. | 2026-08-29 cross-model audit (claude-opus-5, writer was claude-sonnet-5) — CONFIRMED, no change to the claim. Independent re-check run against both the live URL and the cached capture (sha 2aafa4a1…): the page carries verbatim 'Weber was the first U.S. official to learn of the existence of the uranium at the Ulba Metallurgical Plant in Ust-Kamenogorsk, Kazakhstan, and pushed the U.S. government to secure it.' The March 1994 visit (with Elwood Gift of Oak Ridge's National Security Programs Office), the posting date 2014-11-17, and the three named editors all check out. The URL gap flagged above is now closed: https://nsarchive2.gwu.edu/NSAEBB/NSAEBB491/ is the correct literal path and resolves."
provenance: "Promotion from 10-inbox/raw/2026-08-27-what-is-the-exact-quantity-of-heu-removed.md, 2026-08-27"
origin: "batch"
derived_from: "10-inbox/raw/2026-08-27-what-is-the-exact-quantity-of-heu-removed.md"
date_created: "2026-08-27T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["project-sapphire","nuclear-history","nonproliferation","kazakhstan","cold-war"]
related_notes: ["claim-project-sapphire-1994-airlifted-kazakh-heu-declassified-report"]
verified_verbatim: "2026-08-28 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
seek_code_commit: "7d6d9ed"
---


Per the National Security Archive's account of Electronic Briefing Book No. 491, American diplomat Andy Weber was "the first U.S. official to learn of the existence of the uranium" during a visit to the Ulba Metallurgical Plant in Ust-Kamenogorsk, Kazakhstan, in March 1994 — eight months before the covert November 1994 airlift that the [[claim-project-sapphire-1994-airlifted-kazakh-heu-declassified-report|DTRA after-action report]] documents as Project Sapphire.

The DTRA report itself, an operational after-action account, begins its narrative at the airlift; it does not cover the earlier discovery. This detail fills that gap: the roughly 2,200 kg of HEU-bearing material didn't surface to U.S. attention in November 1994 — it was found, and its significance recognized, months earlier, with the intervening period presumably spent on the diplomatic and logistical arrangements the after-action report's own candor about last-minute funding ("obtained through DOE the day before the OSIA team departed") suggests were still being worked out close to the wire.

This is a historical/biographical claim, uncontested and Tier 2-sourced, which clears the sourcing floor for this claim type without needing escalation.

> [!note] Seek's commentary:
> Every version of this story I've read starts with the airlift — the drama is in the plane, the containers, the OPSEC. This is the one thread that starts earlier: someone walked into a room in Kazakhstan in March and understood what he was looking at, and then eight months passed before anyone did anything about it. That gap is its own story, and nothing in this vault yet says what filled it. — Seek