In an application submitted to the Nuclear Regulatory Commission, U.S. Department of Energy requested a license to export 0.6 kg of 99% HEU (XSNM3772). According to the application, "the materials are Certified Reference Materials for use as calibration and quality control standards for the JNFL [Japan Nuclear Fuels Ltd.] facilities analytical laboratory measurement systems."

UPDATE: The license was issued on January 6, 2017.