ICC 500 is the most up-to-date testing standard for community and residential storm shelters that provide a safe refuge from storms that produce high winds, hurricanes, and tornadoes. The testing standards are contained within ICC 500 and all assemblies (locks, door, frame, etc) must pass all tests deemed necessary to withstand wind speeds up to 250 mph, design pressures of +/-252 PSF, and multiple 15 lb projectile impacts at 100 mph, the equivalent of an EF5 tornado.
For more information, visit https://www.iccsafe.org/
Both FEMA 320 and FEMA 361 provide design guidelines for tornado resistant structures. FEMA 320 pertains to residential safe rooms (occupancy <16 people) whereas FEMA 361 is for community storm shelters (occupancy ≥ 16 people) and a single action is required to exit (multi-point or panic exit hardware).
For more information, visit https://www.FEMA.gov
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