; (F) how small in-space nuclear fission reactors can complement or replace existing and planned radioisotope thermal generator capabilities; and (G) information on very low cost, high reliability designs that can be made operational quickly. (d) Demonstration NASA should demonstrate a nuclear electric power reactor for use in space using existing authorized funding levels and within a schedule made possible by appropriated funding. IV Aeronautics 401. Supersonic research (a) Policy It is the policy of the United States to reduce Government barriers to the development of civil supersonic transportation. (b) Research Section 40112(a) of title 51, United States Code, is amended— (1) by striking The Administrator and inserting the following: (1) In general The Administrator ; and (2) by adding at the end the following: (2) Research The Administrator, in consultation with the Administrator of the Federal Aviation Administration, shall undertake research on supersonic transport to inform and accelerate the promulgation of domestic regulations and international standards and recommended practices that will open up the U.S. civil airspace to civil supersonic transport. . 402. Unmanned aircraft systems research (a) In general (1) Title 51 Chapter 315 of title 51, United States Code, is amended by adding at the end the following: 31506. Unmanned aircraft systems research The Administrator, in consultation with the Administrator of the Federal Aviation Administration and other Federal agencies, shall conduct research on facilitating the safe integration of unmanned aircraft systems into the national airspace system, including— (1) positioning and navigation systems; (2) sense-and-avoid capabilities; (3) secure data and communication links; (4) flight recovery systems