Johnson A
Energy Solutions, 1009 Commerce Park, Suite 100, TN 37830, USA.
Health Phys. 2006 Nov;91(5):494-7. doi: 10.1097/01.HP.0000232849.55523.ed.
The current U.S. economic environment for the disposition of radioactive waste, including very-low-activity metals, is currently experiencing relatively low radioactive disposal costs and readily available disposal space. Despite the recent market increase in demand for recycled scrap metal commodities, there is still little change in the behavior of the nuclear industry (including radioactive waste processors and radioactive scrap metal recyclers) to pursue the recycling of potentially contaminated scrap metal. The relatively low cost of traditional radioactive waste disposal combined with the perceived risks associated with recycling of previously contaminated metals means that most U.S. radioactive facility managers and stakeholders will elect not to recycle. Current technology exists and precedence has been set for prescreening (by means of bulk radioactive assay techniques) scrap metal that is not contaminated and diverting it to industrial landfills for disposal. Other processes also allow some radiologically contaminated metals to be melted and recast into products with low, but acceptable, activity levels for restricted use in the nuclear industry. A new concept is being considered that would create a centralized licensed facility for the process and disposition of "very-low-activity" metals for "directed first use." The advantages to this type of approach would include a standardized method for licensing the clearance process.
当前美国处置放射性废物(包括极低放射性金属)的经济环境下,放射性废物处置成本相对较低,且处置空间充足。尽管近期再生废金属商品的市场需求有所增加,但核工业(包括放射性废物处理商和放射性废金属回收商)在回收潜在受污染废金属方面的行为仍变化不大。传统放射性废物处置成本相对较低,再加上回收先前受污染金属存在的风险,这意味着大多数美国放射性设施管理者和利益相关者会选择不进行回收。目前已有技术,且已确立了对未受污染的废金属进行预筛选(通过批量放射性检测技术)并将其转移至工业垃圾填埋场处置的先例。其他工艺也能使一些受放射性污染的金属熔化并重新铸造成放射性活度较低但可接受的产品,供核工业有限使用。目前正在考虑一个新概念,即设立一个集中的许可设施,用于“极低放射性”金属的处理和处置,以供“直接首次使用”。这种方法的优点包括为许可清除程序提供标准化方法。