After Fukushima, Tasks Remain for the American Nuclear Industry

Among the safety proposals being discussed are hardened vents in older reactors and filters to trap radioactive particles.

In response to the nuclear accident at Fukushima, the N.R.C. ordered installation of “reliable hardened vents” on older G.E.-designed boiling water reactors.

Of 31 reactors, 23 already have “hardened vents” and eight have no vents at all; even reactors with vents will need work on the valves to assure they are operable without electricity, which was a problem at Fukushima.
[link to www.nytimes.com]
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