Filtered vented containments

Adding Filtered Vented Containment System (FVCS) to an existing nuclear power plant has been suggested as one approach to mitigating the effects of a Severe Accident. The integration of a new system into a plant appears simple on the surface but may be expensive to install and complex in developing operating procedures and restrictions. A number of designs have been proposed and many are currently being installed at European nuclear facilities. Risk assessments and cost benefits for an FVCS installation in a typical U.S. plant are discussed. An approach to developing an FVCS and strategies for system operation (venting) is also included along with a conceptual design of a sand/gravel filter system. Estimated installed costs are included