Even with the 3 S's system, Japan appeared overwhelmed by the March 11 quake, according to Tony Pietrangelo, a spokesman for lobbying group Nuclear Energy Institute.
"Clearly what happened in Japan is well beyond what [the nuclear plants] were designed for," he said.
CLICK HERE to read about nuclear emergency disaster concerns in the U.S.
ABC News' David Kerley and Cindy E. Rodriguez contributed to this report.
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