[1] During SAFSTOR the de-fuelled plant is monitored before complete decontamination and dismantling of the site, to a condition where nuclear licensing is no longer required.
Different sub-levels of SAFSTOR are recognized, which vary in the type of activity and monitoring required.
[3] All varieties of SAFSTOR require positive action to decontaminate the site at the end of the storage period.
[4] Mixtures of options may be used, for example, immediate removal of steam turbine components and condensers, and SAFSTOR for the more heavily radioactive containment vessel.
Since NRC requires decommissioning to be completed within 60 years, ENTOMB is not usually chosen since not all activity will have decayed to an unregulated background level in that time.