EVALUATING REQUIREMENTS FOR STEWARDSHIP OF CONTAMINANT ISOLATION FACILITIES

摘要

A new methodology for evaluating requirements for stewardship of contaminant isolationrnfacilities (such as uranium mill tailings, low level radioactive and hazardous chemical disposalrnsites) is presented. This methodology consists, of (i) the development of a database from thernexperience of monitoring of remediated mill tailings piles for facilitating data accessing forrnanalysis and visualization, (ii) using the database to determine system events (e.g. erosion, biointrusion,rnetc.), and their likelihood and consequences, (iii) the development of event/responsernscenarios and logic diagrams, (iv) the use of the probabilistic approach to determine the impactrnof potential events on risk and cost, (v) the use of this information to improve design and postclosurernresponses, and (vi) comparison of costs and risks of remediation versus no action takingrninto account changes in risk in time. The paper provides details concerning the approach tornmodel development and the results of the analyses performed for the erosion scenario at uraniumrnmill tailings remediation sites.