The measures for works in the restricted areas in Fukushima Prefecture were specified in Occupational Safety and Health Department Notification No. 0517-3 of 17 May 2011. For measures for restoration works in new evacuation-directed area, Reconstruction Agency and Nuclear Emergency Response Headquarters notified us of the Annex to their notification “Measures for restorations in new evacuation-directed area” of 14 February 2012 (note that Annex 2 of Occupational Safety and Health Department Notification No. 0214-1 of 14 February 2012 was eliminated by Labour Standards Bureau Notification No. 0615-6 of 15 June 2012).
Note also their notification which refers to Ionizing Radiation Ordinance for Decontamination.