That would be afffirmative.
https://nsarchive.gwu.edu/briefing-book/nuclear-vault/2016-11-02/numec-affair-did-highly-enriched-uranium-us-aid-israels-nuclear-weapons-program
The NUMEC Affair: Did Highly Enriched Uranium from the U.S. Aid Israel's Nuclear Weapons Program?
Document collection and introduction by Roger J. Mattson, PhD
Beginning more than 50 years ago, and extending over the period from 1957 to 1978, according to official U.S. government records and studies, more than 300 kilograms of uranium 235 (U-235) in the form of highly enriched uranium (HEU) went missing from a nuclear fuel manufacturing plant in the small town of Apollo, Pennsylvania. The Atomic Energy Commission (AEC) concluded in 1966 that there was about a 200-kilogram deficit between the U-235 in the form of HEU supplied to the plant and the amount returned in products to customers. After the AEC and its Oak Ridge office calculated the processing losses based on NUMEC’s records, they determined that the fate of about 100 kilograms of U-235 in the form of HEU remained unexplained. NUMEC paid for the missing material, but later disputed the AEC calculations, maintaining that the unexplained 100 kgs could be attributed to other processing losses. After decommissioning of the Apollo plant, more than 330 kgs of U-235 in the form of HEU were unaccounted for, with most of that deficit occurring while NUMEC ran the plant.