Lessons learnt from application of the standardized cost calculation code OMEGA indecision making processes and planning in decommissioning

摘要

Implementation of the standardised cost structure, as defined in "A Proposed StandardisedList of Costs Items for Decommissioning Purposes" (OECD/NEA, IAEA, EC, 1999), into the decommissioningcosting, supports the harmonisation of decommissioning costs. The decision making processes indecommissioning planning can be more effective if there is the possibility to compare the calculated data withthe data of other projects, structured in standardised cost structure. The results of the decision making processshould be based on evaluation of such a set of decommissioning options which covers the methods ofdecommissioning, the selected strategy and existing or planned decommissioning infrastructure. Aspects such asimpact of time, waste management scenarios, uncertainties of input data and other aspects should be alsoevaluated. These issues of decision making process were implemented into the decommissioning costing codeOMEGA. All activities of a decommissioning project are involved within single compact standardisedcalculation structure including waste management. The resulting costs have standardised format and noadditional data conversion is needed. The calculation process is nuclide resolved and internally linked in such away that it models the material and radioactivity flow in the decommissioning process. The effect of decay ofradioactivity is considered. The options are optimised in the standard MS-Project software as Gantt charts. Thebi-directional data link between the standardised calculation structure and the Gantt chart supports the on-lineoptimisation of the Gantt chart structure. Multi-option work is applied, I.e. decommissioning options, whichcover all decommissioning scenarios to be considered, are evaluated individually and multi-attribute analysis isapplied for selecting the optimal one. Methods of sensitivity analysis and evaluation of uncertainties ofcalculated costs were developed for support the decision making process and for definition of contingencies.