http://64.233.167.104/search?q=cache:HSExclnpXj4J:www.nti.org/e_research/official_docs/other_us/crs020405.pdf+homeland+security+nuclear+power+plants&hl=en The 109th congress was supposed to enact legislation to solve the nuclear plant security problems outlined here, was that ever acomplished? It points out that nuclear fuel rods are stored outside the containment structure. My characterization of these areas as "lightly guarded" is based on this sort of investigation by congress.