1. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 1 R&D on decommissioning at EDF

2. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 2 EDF Background  9 nuclear power plants in decommissioning process  6 graphite -gas reactors (Chinon : 3, St Laurent 2, Bugey 1)  1 heavy water reactor (Brennilis)  1 PWR (Chooz)  Decommissioning scheduled up to 2025  Cost : 3 billions €  Specific wastes sites:  Very low level waste ( < 100 Bq/g)  graphite storage

3. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 3

4. 4 Organisation  A new EDF engineering Department as been set up in 2001 to perform the decommissioning program  CIDEN : French acronym for «Decommissioning and Environmental Engineering Department»  EDF R&D Assist the CIDEN decommissioning project Technical & scientific support Research of innovatives solutions best technical solutions cost-effective technologies

5. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 5 R&D program components  5 Components  Waste characterisation and management  Environmental management  On site dismantling techniques  Cost and efficience benchmarking  keeping the knowledge on long term  Ten R&D groups involved

6. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 6 Waste characterisation and management  Decontamination processes  Chemical and physical decontamination process  Mainly focused on waste reduction  Waste management softwares  Fonctional analysis of several sofwares  Participation to the upgrading of EDF sofware

7. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 7 Waste management and characterisation (2/3)  Evaluation of concrete contamination depth  We must know a priori the contaminated concrete thickness to remove sampling is long and expansive two alternative techniques studied  Simulation from surface spectrometry Camberra(Isocs) & Onectra techniques tested Tests performed at Brennilis interesting intermediate results, improvments to be done  Simulation of migration If we know the date of contamination events, are we able to predict the contaminated thickness ? adaptation of the CHEMTRAP code : simulation of diffusion, migration sorption, solubility phenomenons in concrete Cs, Co, 3 H, Ni

8. Diffusion of Cs & Co in concrete : - 2D simulation  Influence of a crack on the depth of penetration 5 years20 years Co in solutionPrecipité 1Precipité 2 Co CsCs

9. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 9 Environmental management  Help to risk and environmental analysis for decommissioning  Data specific to decommissioning ( tritium, 14 C,...)  Models of environmental impacts  Environmental remediation techniques  Acoustic impact control on demolition site

10. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 10 On site dismantling techniques  Development of an integrated engineering software for decommissioning (planification, wastes, costs, engineering scenarios, dosimetry...). pilot study for a preliminary decommissioning project studies  Robotics solutions

11. Didier Noël, EDF R&D on Decommissioning, Bruxelles, mars 7th, 2003 11 Long-term knowledge keeping  25 years decommissioning = very long time period  how maintain knowledge on the long term ?  The objective is to structure, formalize and share the various knowledges involved in decommissioning  first step : software mock-up on limited subjects  modelisation of the typology of various knowlege could bring solutions