Decommissioning work on the FR 2 research reactor plant, 1981 to 1996. Final Report

Project activities on decommissioning the FR2 research reactor plant began immediately after final shutdown in December 1981. At that time, post-operational measures were taken to render recommissioning of the plant impossible; the fuel elements and the primary coolant were removed for external use; auxiliary systems and monitoring facilities no longer needed were decommissioned, and experimental facilities inside and outside the reactor block were dismantled. The implementation of decommissioning measures, for which six permits had been applied for and issued under Sec. 7 of the German Atomic Energy Act, allowed the reactor block to be safely contained, all ancillary and auxiliary systems to be dismantled, and the residues arising in the process to be duly disposed of. Radioactive contamination was removed from all buildings as far as necessary, and after comprehensive radiological check measurements and investigations demonstrating that the permissible limits were underrun - expect for the so-called top shield catwalk in the reactor block - these buildings were released from the controlled-area regime. In the reactor building, building No. 607 (rotunda), new supply, disposal and monitoring systems and a facility for maintaining a negative pressure in the safely contained reactor block were installed. The storage pool building, building No. 608, the ventilation building, building No. 609, complete with the pipe duct, cable duct and ex-vent air ducts leading to the exhaust air stack, the central power supply unit, building No. 611, and the cooling tower plant with the pump building, building No. 612, were demolished, the site was leveled and replanted with vegetation. (orig.)