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Management of Commercially Generated Radioactive Waste - U.S. ...

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C.6<br />

boundary (e.g., evacuation). These action levels are commonly set between the Concentration<br />

Guides and the levels due to background plus normal operations. Since a Concentration Guide<br />

is a definite value and the background value is a distribution which is largely site-<br />

determined, selection <strong>of</strong> not only an ALARA impact but also any "Action Levels" will depend<br />

upon cost-benefit-risk considerations. In practice there will normally be a series <strong>of</strong><br />

graded action levels, with the lowest only an "investigation level." For example, as a<br />

design objective the allowed impact due to normal operation might be "set" at 1% <strong>of</strong> the Con-<br />

centration Guide and an immediate remedial action level might be established at that point.<br />

A working limit, or investigation level, might in addition be set based on some multiple <strong>of</strong><br />

the expected normal impact, provided that was still lower than the remedial action level.

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