Abstract
A multibarrier containment consisting of a free-standing steel shell enclosed by a reinforced-concrete shield building was chosen for the Kewaunee and Prairie Island Nuclear Power Plants. A comparative study was made of the currently available containment systems for pressurized water reactors. The multibarrier concept was chosen because of its favorable cost and its inherent features which can be utilized to control any radioactive leakage. The space between the steel shell and the shield building is utilized to collect all leakage from the primary steel shell barrier. The leakage-laden air is passed through efficient filters for entrapment of radioactivity before it is exhausted from the secondary barrier. The primary containment vessel is a welded steel pressure vessel designed and code stamped as an ASME Class B Vessel. The shield building is a reinforced-concrete structure which provides biological shielding, and protection for the steel shell from adverse environments and external missiles.
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