I:
International Nuclear Safety Center (INSC) - Information on specific nuclear plants, material properties for safety and risk analyses, INSC project documentation, and project-specific reactor safety bibliographies [Department of Energy (DOE), Argonne National Laboratory (ANL)]

S:
Science and Technology Policy - Science Tracer Bullet - Research guide from the Library of Congress, Science Reference Section [Library of Congress]

U:
United States Global Change Research Program - Coordinates and integrates federal research on changes in the global environment and their implications for society. [Multiple agencies involved]