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Nagra Activation Analysis Methodology

Monday, 29 May 2017, 11:00-12:00
KIT Campus Nord, INR, Bau 521, 2. OG, Raum 302
Abstract: The Swiss national law states that the producers of nuclear waste are financially responsible for its disposal, following a ?polluter pays? principle. For this purpose, two funds have been set up to cover the associated costs for NPPs: The Decommissioning Fund and the Waste Disposal Fund. Every five years, the cost estimates associated with these funds are revised and verified by the Swiss government. A significant part of these costs comes from the decommissioning of NPPs, estimation of which requires the knowledge of the total activity inventory and its distribution for each Swiss NPP after the final shutdown. For this reason, the Swiss National Cooperative for the Disposal of Radioactive Waste (Nagra) regularly performs nuclear activation simulations for reactor internals, RPV, and the surrounding structures. These results affect both the dismantling procedures and the following packaging strategy for the final disposal of these components as radioactive waste. The activation simulations follow a methodology developed by Nagra over the past 15 years, currently based on Monte Carlo transport and extensive in-situ foil-activation validation campaigns. This presentation will focus on the history of the development of this methodology, the current work status for the Swiss NPPs, as well as international decommissioning projects.
Dr. Benjamin Volmert

Nationale Genossenschaft für die Lagerung radioaktiver Abfälle (NAGRA), Wettingen, Schweiz