programs of previous nuclear disasters like this one at three mile island or confront students with entirely new situations. and while that builds confidence on a nuclear level, there are steps being taken to improve safety on the technical side too. the french nuclear constructor is now desighing reactors with double shells and a catch pacen under the reactor core to consolidate fuel rods, basically planning for the worst because a core meltdown is no longer thinkable. >> by doing it to the maximum, it will cool down and get out of the primary vessel. if that were to happen, then we have a number of systems which are waiting for it some how. >> reporter: the power plant designer says the safety features included the new nuclear plant add about 25% to