Abstract
We are considering the problem of early and late “containment failure” independently from the event occurrence frequency. We are looking for a system in (and outside of) the containment of a BWR which would help to mitigate severe accidents and minimize the environmental impact in the case of radioactivity release. A parametric study for an activity release (a) at 20 m chimney height, and (b) at 100 m chimney height, shows that the environmental impact at 20 m (with filter) and at 100 m even without filter are small both for early and late release. We are proposing a system which would help to avoid any early or late containment failure. This system has been conceived for a new plant and it may be possible that the system design has to be modified for an already built nuclear power plant. Applying the proposed system, the environmental impact would be within the allowable accident dose limit of the Swiss radiation protection ordinance, i.e., any horizontal evacuation of the population in the vicinity of the nuclear power plant will not be necessary.
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