Annual report for FY2014 on the activities of Department of Decommissioning and Waste Management. April 1, 2014 - March 31, 2015

This report describes the activities of Department of Decommissioning and Waste Management (DDWM) in Nuclear Science Research Institute (NSRI) in the period from April 1, 2014 to March 31, 2015. The report covers organization and missions of DDWM, outline and operation/maintenance of facilities which belong to DDWM, treatment and management of radioactive wastes, decommissioning activities, and related research and development activities which were conducted in DDWM. In FY2014 radioactive wastes generated mainly from R and D activities in NSRI were treated safely. They were about 224m³ of combustible solid wastes, 239m³ of noncombustible solid wastes and 206m³ of liquid wastes. After adequate treatment, 1,953 waste packages (in 200L-drum equivalent) were generated and total accumulated waste packages amounted to 127,544 as of the end of FY2014. The total amounts of accumulated waste packages were decreased by the restitution of waste packages to the Japan Radio Isotope Association, the clearance of concrete, etc. Decommissioning activities were carried out for the JAEA's Reprocessing Test Facility (JRTF), the Mockup Building and the Liquid Waste Treatment Facilities. Authorization of clearance was granted by regulatory authorities to release about 512t of concrete debris in FY2013. As for the R and D activities, studies on radiochemical analyses of wastes for land disposal and JRFT decommissioning technologies were continued. Repair works for the damages of the facilities caused by the Great East Japan Earthquake were carried out. R and D activities against the severe contamination of lands caused by the Fukushima Daiichi Nuclear Power Station accident were also performed. (author)