AN APPLICATION OF A STATE OF THE ART 3D-CAD-MODELING AND SIMULATION SYSTEM FOR THE DECOMMISSIONING OFNUCLEAR CAPITAL EQUIPMENT IN RESPECT OF GERMAN PROTOTYPE SPENT FUEL REPROCESSING PLANT KARLSRUHE

摘要

Siempelkamp Nukleartechnik GmbH is engaged in the optimization of decommissioningrnprocesses for several years. With respect of the complexity of the projects, the time frame andrnthe budget it is necessary to find more effective ways to handle those tasks in the near future.rnSeen from this angle, the decommissioning of thernGerman Prototype Spent Fuel Reprocessing PlantrnKarlsruhe (WAK, Fig. 1) is an excellent example forrnthe use of state of the art 3D-CAD- modeling andrnsimulation systems to reach those facts.rnThe situation: During 25 years of operation, 208 tonsrnof nuclear fuel with a burnup of up to 40 GWd/trnincluding MOX-fuel, have been reprocessed in thisrnplant.rnThe decommissioning and dismantling will be achieved in six steps taking into account thatrnsome processing equipment can be dismantled before and the rest only after the High ActivernLiquid Waste Concentrate (HAWC) has been vitrified approximately by mid of 2005.rnAfter the successful beginning of the remote dismantling of the main process cells from Marchrn2000 /1/, the next remote dismantling project at the WAK was initiated April 2000 (RemoternDismantling of the WAK High Active Waste Concentrate Storage Facilities /3/).rnFive Medium Active Waste (MAW) storage tanks and four High Active Waste Concentratern(HAWC) storage tanks, located above ground in five heavy shielded cells adjacent to the mainrnprocess building, have to be dismantled. In total ～ 130 tons of concrete (from access openings)rnand ~ 120 tons of metal structures covering an overall activity of ～ 2,5 × E15 Bq have to berndismantled remotely with respect to radiation levels up to 2200 mSv/h.rnIn the past, WAK used and operated mock-ups (Scale 1:1) to verify planning, design andrnoperation aspects with remote dismantling technologies: