Review of proposed improvements, including filter/vent of BWR pressure-suppression and PWR ice containments. Final report

A state-of-the-art review of improvements including filter/vent of BWR pressure suppression and PWR ice containments has been carried out. It includes a summary description of operating and planned BWR pressure suppression and PWR ice containments; a review of improvements proposed to-date; an assessment and an updating of the risks associated with the various containment failure modes as developed in the Reactor Safety Study; the formulation of a design improvement strategy based upon the dominant risk scenarios; an evaluation of various potential preventive and mitigation concepts and, in particular, the application of filter/vent systems; and finally, a set of recommendations