Declassified U.S. Government Report Prepared a Week After Fukushima Accident: “100% of The Total Spent Fuel Was Released to the Atmosphere from Unit 4”
The fuel pools and rods at Fukushima appear to have “boiled”, caught fire and/or exploded soon after the earthquake knocked out power systems. See this, this, this, this and this.
The source term provided to NARAC was: (1) 25% of the total fuel in unit 2 released to the atmosphere, (2) 50% of the total spent fuel from unit 3 was released to the atmosphere, and (3) 100% of the total spent fuel was released to the atmosphere from unit 4.
NARAC
is the the U.S. National Atmospheric Release Advisory Center, located
at the University of California’s Lawrence Livermore National
Laboratory. NARAC “provides tools and
services that map the probable spread of hazardous material accidentally
or intentionally released into the atmosphere“.
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