. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1970 1972 1974 197« 197S 1980 19S2 19S4 19Se 19M 1990 ââ â Annual â*â 5-year average Figure 11. Cubic feet of low level radioactive waste shipped by Illinois utilities. At the same time that volume was decreasing, the reported radioactivity (in curies) of low-level waste was increasing (Figure 12). Using the five-year average, in 1974 the average level of radioactivity was 426 curies, in 1983 the a
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 1970 1972 1974 197« 197S 1980 19S2 19S4 19Se 19M 1990 ââ â Annual â*â 5-year average Figure 11. Cubic feet of low level radioactive waste shipped by Illinois utilities. At the same time that volume was decreasing, the reported radioactivity (in curies) of low-level waste was increasing (Figure 12). Using the five-year average, in 1974 the average level of radioactivity was 426 curies, in 1983 the average was more than 10 thousand curies, and in 1991 it was 41 thousand curies. Subsequently, the ratio of megawatt-hours per curie of low level waste decreased from thou- sand mWh in 1983 to thousand mWh by 1989. The spike in radioactivity in 1989 was caused by several shipments of activated hardware, consisting of about 400 cubic feet and more than 130,00 curies, from two reactors belonging to one utility. Some of the activated hardware had been in storage for more than 10 years. Clean-out of such waste usually requires special handling and is very expensive. 160000 140000 120000 100000 soooo eoooo 40000 20000. 1970 1972 1974 197S 1978 1980 1982 1984 1986 1988 1990 ââ¢â Annual â*â 5-ye«r average Figure 12. Radioactivity (curies) of low-level waste shipped by Illinois utilities. 34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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