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Related Experiment Videos

Target station shielding issues at the spallation neutron source.

P D Ferguson1, F X Gallmeier, E B Iverson

  • 1Spallation Neutron Source, Oak Ridge National Laboratory, 701 Scarboro Road, Oak Ridge, TN 37830-6474, USA. fergusonpd@ornl.gov

Radiation Protection Dosimetry
|December 31, 2005
PubMed
Summary

Shielding for spallation neutron sources was updated for beam shutters and hot cell walls. Analysis determined void impacts on dose rates, shifting focus to retrofit shielding solutions as construction nears completion.

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Area of Science:

  • Nuclear engineering
  • Radiation shielding
  • Particle accelerator physics

Background:

  • Spallation neutron sources require robust shielding for safe operation.
  • Neutron beam shutters and hot cell walls are critical shielding components.
  • Design evolution from greenfield to near-completion construction impacts shielding strategies.

Purpose of the Study:

  • To present recent shielding activities for neutron beam shutters and hot cell walls.
  • To analyze the impact of voids in hot cell walls on radiation dose rates.
  • To document the transition in shielding approach from initial design to construction completion.

Main Methods:

  • Evaluation of shielding materials (concrete, steel) for neutron beam shutters at different power levels.

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  • Dose rate analysis for hot cell wall voids as a function of void size.
  • Review of shielding design changes throughout the project lifecycle.

    • Main Results:

    • Neutron beam shutters can be shielded with concrete at low power or concrete and steel at ~500 kW.
    • Void size in hot cell walls significantly impacts dose rates.
    • Shielding challenges evolved from greenfield design to retrofit analyses.

    Conclusions:

    • Effective shielding strategies for spallation neutron sources depend on operational power and structural integrity.
    • Void mitigation is crucial for maintaining low dose rates in hot cell environments.
    • Adaptive shielding approaches are necessary for complex accelerator construction projects.