Re: Damage
Hero System Almanac 2 broke down the affects of a 1 MT nuclear bomb. Being at ground zero a character would suffer the following.
Radiation Burst: 6d6 RKA AVLD(Power Defense), 3d6 CON and BODY drain, recover 5 pts. per month.
Thermal Blast: 20d6 RKA
EMP: 6d6 RKA only vs. electrical circuitry
Blast Wave, Static Overpressure: 20d6 RKA
Blast Wave, Winds: 20d6 RKA, Double Knockback
Negative Pressure: 3d6 RKA
Hope this helps.