| National Powder Factory of Ripault | |
|---|---|
 Partial view of the Ripault site in 1916 (postcard). | |
 | |
| Operated | 1786 |
| Location | Monts (Indre-et-Loire, Centre-Val de Loire) |
| Coordinates | 47°17′39″N 0°40′20″E / 47.29417°N 0.67222°E |
| Style | Powder mill |
| Area | 120 hectares |
| Owner(s) | CEA |
The National Powder Factory of Ripault is a former powder mill situated within the territory of the French commune of Monts, located in the department of Indre-et-Loire in the Centre-Val de Loire region.
The facility was established on the eve of the Revolution in 1786 by Antoine Lavoisier, General Manager of the Royal Administration of Powders, as a replacement for a wire-drawing mill constructed along the Indre River a few years earlier. The wire-drawing mill was a continuation of the flour mills documented in the 16th century. The facility gained importance throughout the nineteenth century and, in the 1840s, was considered "the most beautiful powder mill in Europe." During the First World War, it employed up to 6,000 workers and underwent significant expansion by producing B powder, which had supplanted black powder. At the start of World War II, at its peak, its facilities extended over 120 hectares.
The history of the company is characterized by periods of expansion that coincided with periods of increased military demand for powder and explosives in France. However, these periods were also marked by accidents, including fires and explosions. The most serious of these incidents resulted in the deaths of at least 74 individuals and injuries to 345 others, with the precise number of casualties remaining uncertain. Additionally, the factory was completely devastated on October 18, 1943, during its occupation by German authorities. Following the resumption of activity in 1945, the significant reduction in demand for explosives forced the company to diversify its activities. This included the production of furniture, paints, and antibiotics, until the factory's closure in 1959.
In 1961, the Commissariat à l'énergie atomique (CEA) assumed control of the site and a significant portion of its workforce, placing it under the direction of the Military applications division (DAM). This arrangement persisted until at least 2018, with the expectation that its activities will continue to expand into the civilian domain in the coming years. An industrial park, encompassing a portion of the land divested by the powder factory after it ceased operations but extending beyond, emerged to the south of the site. A museum, inaccessible to the general public due to its location within the CEA complex, chronicles the history of the powder factory.