At Rancho Seco, 493 nuclear fuel assemblies are stored in casks in concrete bunkers. The site is roughly 27 miles south of Sacramento. The assemblies hold 22 metric tons of uranium, said Einar ...

Dogs helping prevent spread of golden mussels at Rancho Seco 02:10. RANCHO SECO – Before you go in the water at Rancho Seco Lake, you need to let a dog sniff your boat.