I’m sure someone’s mentioned it, but XX published this FR notice in 2015 which notes that the End-User Review Committee

determined that the National University of Defense Technology (NUDT), the National Supercomputing Center in Changsha (NSCC-CS), National Supercomputing Center in Guangzhou (NSCC-GZ), and the National Supercomputing Center in Tianjin (NSCC-TJ), all located in the People’s Republic of China, meet the guidelines listed under § 744.11(b): Entities for which there is reasonable cause to believe, based on specific and articulated facts, that an entity has been involved, is involved, or poses a significant risk of being or becoming involved in activities that are contrary to the national security or foreign policy interests of the United States and those acting on behalf of such entities may be added to the Entity List pursuant to this section. Specifically, NUDT has used U.S.-origin multicores, boards, and (co)processors to produce the TianHe-1A and TianHe-2 supercomputers located at the National Supercomputing Centers in Changsha, Guangzhou, and Tianjin. The TianHe-1A and TianHe-2 supercomputers are believed to be used in nuclear explosive activities as described in § 744.2(a) of the EAR.