Public outreach for the EC Carbon-14 Source Term project

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Presentation transcript:

Public outreach for the EC Carbon-14 Source Term project Name: Erika Neeft & Simon Norris Organisation: COVRA & RWM Date: 8 April 2019

Familiarisation Radiation? Not only radioactive waste Carbon-14?

Newsletters Audience: Public Dissemination plan No knowledge concerning radiation protection Unfamiliar to carbon-14 containing waste Dissemination plan Topics based on scheduled publications A3 infographic each Newsletter With a carbon-14 analogue of cosmic origin

Aim CAST (Carbon-14 Source Term) was an EU research project that aimed to develop understanding of the potential release of carbon-14 from radioactive waste materials under conditions relevant to waste packaging and disposal to underground geological disposal facilities. The project focussed on the release of carbon-14 as dissolved and gaseous species from irradiated metals (steels, Zircaloys), irradiated graphite and spent ion-exchange resins.

Generation of carbon -14 Visualization of EU research project in one picture, origin of carbon-14 for the types of waste investigated in CAST

Generation of carbon -14  + natural abundance  10,000 times C and 10,000,000 times O

Generation of carbon-14 Natural carbon-14 80% nitrogen environmental neutron flux: 0.001 neutrons per cm2 per s Artificial carbon-14 nitrogen in ppm in materials Thermal neutron flux in core NPP: 100,000,000,000,000 neutrons per cm2 per s Carbon-14 concentrations in waste larger than 1 Bq per gram

Release of carbon-14 5: Any reduced carbon species will be oxidised to carbon dioxide by microbes 4: A common value for dilution for geological disposal is 10,000 3: E.g. period to pass clay or salt host rock may take several half-lives of carbon-14 2: carbon-14 release as gas, non-ionic or anionic dissolved carbon-14 species 1: Chemical corrosion rates for steel and Zircaloy are small in alkaline, reducing environments 1: No chemical degradation rate for graphite and ion exchange resins

Comparison Natural: 1,000,000,000 carbon-14 molecules per cm2 per year Artificial if chemical resistance waste form, diffusion clay host rock and dilution in surrouding rock formations are included

Public outreach for CAST Newsletters and other CAST deliverables can be downloaded at https://www.projectcast.eu until March 2023 References and justification of assumptions used in this presentation: Thank you for your attention Any questions?