Hanford B Reactor Reaches Criticality

The first large-scale reactor for industrial plutonium production.

Industry, infrastructure and technology changed rapidly between 1938 and 1946, reshaping production, mobility and the material foundations of war and post-war recovery.

On 26 September 1944, in United States, the milestone “Hanford B Reactor Reaches Criticality” occurred. WWII CHRONOS records it as a specific industrial or technological event rather than as a vague multi-year trend.

Verified figure or fact: The first large-scale reactor for industrial plutonium production. Physical measurements in WWII CHRONOS are expressed in the metric system.

This nuclear industry milestone helps explain the material systems behind the era: factories, energy, transport networks, extraction, communications, new materials and production methods.

The industrial achievement formed part of the atomic-weapons programme. Its engineering scale is historically important, but so are the programme’s military purpose and consequences.

Editorial status: Date and core fact verified. The source below supports the period and central claim; unsupported details have deliberately not been added.

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