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AbstractAbstract
[en] Safestore decommissioning of the AVR 15 MWe experimental nuclear power plant with pebble bed high-temperature gas-cooled reactor (HTGR) began in March 1994 with defueling (phase 1). Beginning of Aug. 1997, defueling as to 81% completed. Other achievements: The dismantling in the turbine hall and outside the buildings is nearly terminated, the cooling towers are demolished, and the helium bottle-battery storage and helium compressors were removed from the ring buildings in Dec. 1996. The latter was the first dismantling inside the reactor building and belonged to projects that had been advanced from the 2nd into the 1st phase of Safestore decommissioning because of the delay in defueling. Furthermore, the licence for a first supplement to Safestore decommissioning was granted in March 1997. Inside the containment, the removal of shielding material and of insulation material from the secondary circuit components is either already or will shortly be terminated. This will give access for cutting and sealing the 120 steam generator pipe penetrations above the outer reactor vessel. The scope of Safestore decommissioning, as licensed in March 1994, will be extended by three supplements, comprising mainly the dismantling of (1) the fuel handling system, coolant circulators, and interspace convection pipe, (2) the coolant purification system, and condensation coolers, and (3) the shutdown rod system. The goal is to clear the containment from all auxiliary systems and to seal the outer reactor vessel until the end of 2001. The final goal of Continued dismantling is the restoration of the green field until 2011. The term indicated the direct transition from the present Safestore decommissioning and a stepwise procedure that can be interrupted after each step and be transferred into a Safestore mode. The decision for Continued dismantling is expected in 1998; a contract for the design and licence planning will be awarded soon. (author)
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International Atomic Energy Agency, Vienna (Austria); 314 p; ISSN 1011-4289;
; Sep 1998; p. 41-53; Technical committee meeting on technologies for gas cooled reactor decommissioning, fuel storage and waste disposal; Juelich (Germany); 8-10 Sep 1997; 5 refs, 4 figs

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Report
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Conference
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BOILERS, BUILDINGS, CONTAINERS, CONTAINMENT, DECOMMISSIONING, ENRICHED URANIUM REACTORS, EQUIPMENT, GAS COOLED REACTORS, GRAPHITE MODERATED REACTORS, HELIUM COOLED REACTORS, HOMOGENEOUS REACTORS, HTGR TYPE REACTORS, LAWS, MACHINERY, MANAGEMENT, MATERIALS, PEBBLE BED REACTORS, POWER REACTORS, REACTORS, REGULATIONS, SOLID HOMOGENEOUS REACTORS, STORAGE, THERMAL REACTORS, THORIUM REACTORS, TURBOMACHINERY, VAPOR GENERATORS, WASTE MANAGEMENT
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