Risk-Based Classification of Radioactive and Hazardous by Michael Joyce

By Michael Joyce

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Extra info for Risk-Based Classification of Radioactive and Hazardous Chemical Wastes (Ncrp Report, No. 139)

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Low-level waste) and, thus, pose a greater hazard in waste management and disposal. The classification system for hazardous chemical waste does not distinguish between hazardous wastes based on their source, with the exception of the ‘‘K’’ list of wastes from specific sources. , there is only one class of hazardous chemical waste). , near-surface facilities or geologic repositories), whereas only a single type of disposal system (a nearsurface facility) is used for all hazardous chemical wastes, regardless of the potential risks posed by the waste.

Risks that are ALARA depend on the particular exposure situation, and achieving a negligible risk is not the goal of ALARA. e Excess lifetime cancer risks considered negligible have values in the range of about 10‫מ‬4 to 10‫מ‬6 or below, depending on the exposure situation; intakes of noncarcinogenic hazardous chemicals less than RfDs are considered negligible. f Risks also are considered unacceptable if they are below intolerable levels but are not ALARA. g Approach to risk management for hazardous chemicals does not explicitly include concept of an intolerable risk that normally must be reduced regardless of cost or other circumstances.

Furthermore, allowable risks or doses used to define conditions for unrestricted release should be similar to the values that would be used to determine exempt waste. Therefore, prior to unrestricted release of a site, scenarios for inadvertent intrusion into near-surface disposal facilities for low-hazard waste should be regarded as accidental occurrences.

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