What are the criteria for residual radioactivity at the site at the end of decommissioning, assuming that the licensee is planning for restricted use of the site?
The Commission’s criteria for restricted use of the site are more complex than for unrestricted use and are tiered. Residual radioactivity at the site must have been reduced so that there would be reasonable assurance that the total effective dose equivalent from the residual radioactivity to the average member of the critical group would not exceed 25 millirem (0.25 millisievert) per year with institutional controls in place and either 100 millirem (1 millisievert) or 500 millirem (5 millisievert) per year with no institutional controls. Institutional controls include engineered controls (such as fences) and restrictions on the site’s deed (e.g., parks or farms are not allowed). Institutional control could include ownership by the Federal or State government, thus providing for a legal mechanism to restrict public access.
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