Post-accident filtration as a means of improving containment effectiveness
Post-accident filtration as a means of improving containment effectiveness A preliminary design is presented for a post-accident filter system (PAFS) for both the PWR dry containment and the BWR Mark I containment designs. The primary function of the PAFS is to improve the effectiveness of the containment under core-melt conditions by providing an external filter through which the air/steam mixture in the containment can be vented to the atmosphere, thus preventing the containment from rupturing due to overpressurization. The PAFS has a secondary function of extracting radioactivity from the containment even in situations where the containment is leaking badly. The PAFS design includes separate filtration components and mechanical devices for the removal of volatized fission product particulates and iodine gases. The selection of filter components is based on current technology and compatibility with the post-accident environment. This report: (1) identifies the conditions under which the filter will be operated; (2) outlines the basic design requirements for the PAFS, the existing filter technology, and the PAFS design for the PWR dry containment; (3) presents detailed design analyses; (4) presents an estimate of risk reductions associated with the use of the PAFS; (5) provides the estimated cost of the PAFS; and (6) describes preliminary consideration of the PAFS designs for other more »
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