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Safety Guidelines for Hg Irradiation Experiments in TT2a Tunnel

Ensure safe handling of unsealed radioactive sources, minimize environmental pollution, and meet ISO 2919 requirements for experimental apparatus design and certification. Proper disposal and re-use strategies for radioactive waste and components are crucial in avoiding potential hazards and contamination. Follow stringent guidelines to prevent any unexpected activation of air, components, and Hg spill incidents.

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Safety Guidelines for Hg Irradiation Experiments in TT2a Tunnel

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  1. Safety Issues for Hg irradiation • Experiment siting - Activation of air and components • Activity of Hg – unsealed radioactive source • Radioactive waste

  2. Experiment in TT2a tunnel • TT2a is an old transfer tunnel. As such, it does not dispose of • ventilation • waste water retention • Activation of air by 40 pulses of 2E13 p corresponds to approx. 1 yr of operation in EHN1. • Lack of beam dump leads to unnecessary activation of components and aggravates air activation

  3. Hg activation • “worst case scenario”: Hg spill • activity of Hg after 1 month > 22 LA (50% most active isotopes) • TT2a drains go directly in Nant’d’Avril • Radioactive pollution of environment • Handling of unsealed sources • Work sector • “Sealed” design of experimental apparatus

  4. ISO 2919 • International standard, describing design requirements for sealed radioactive sources • Graded requirements to respond to environmental conditions • We require the nearly lowest resistance classes:

  5. “Certification”? • No certification required, but: • traceable demonstration, that the (weakest parts of the) apparatus fulfil the mentioned requirements • Measurements, FE calculations, use of certain materials … • SC/GS shall give its consent to the demonstration. • “Weakest parts” (my guess): • beam windows • joints in Hg piping

  6. Radioactive waste • The magnet will be reused in the US or Japan  • The irradiated Hg shall be transported to the new destination “for re-use”  • As much as the magnets in TT2a, the N2 system will be slightly activated – any re-use envisaged ?

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