In 1957, Del Rosario led the organizing committee of the symposium Atomic Energy and the University of Puerto Rico ("Energía Atómica y la Universidad de Puerto Rico"). The symposium sponsored by ORNL and UPR, was celebrated on January 24-28. Important scientists including Lewis I. Strauss, director of the US Atomic Commission and Alvin M. Weinberg, director of ORNL, participated in the meeting. The topics discussed included plans to install nuclear reactors in Puerto Rico, for scientific research and power generation.