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Related Experiment Videos

Shielding analysis at the upper section of the accelerator-driven system.

Toshinobu Sasa1, Jin An Yang, Hiroyuki Oigawa

  • 1Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken 319-1195, Japan. sasa@omega.tokai.jaeri.go.jp

Radiation Protection Dosimetry
|April 11, 2006
PubMed
Summary

Neutron streaming in accelerator-driven systems (ADS) significantly activates surrounding components. This study quantizes radiation dose from the proton beam duct, revealing a critical need for enhanced shielding in ADS magnet and shield plug designs.

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Area of Science:

  • Nuclear Engineering
  • Accelerator Physics
  • Radiation Shielding

Background:

  • Proton beam ducts in accelerator-driven systems (ADS) facilitate neutron and photon streaming.
  • This streaming activates magnets and other components located above the subcritical core.
  • Accurate radiation dose assessment is crucial for ADS operational safety and component longevity.

Purpose of the Study:

  • To perform a streaming analysis of the proton beam duct in an 800 MWth lead-bismuth target cooled ADS.
  • To quantify the radiation dose from neutrons and photons streaming through the beam duct.
  • To evaluate the activation of magnets and shield plugs due to neutron streaming.

Main Methods:

  • Utilized MCNPX code for calculating radiation dose from streamed neutrons and photons.

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  • Employed plutonium cross sections for secondary photon production due to missing actinide gamma production data.
  • Conducted DCHAIN-SP analysis to assess component activation from neutron streaming.

    • Main Results:

    • Neutron dose from the beam duct was found to be approximately 20 orders of magnitude higher than the bulk shield.
    • Magnets and the shield plug experience significant irradiation from streaming neutrons.
    • The analysis highlights the dominant contribution of neutron streaming to radiation dose and activation.

    Conclusions:

    • Neutron streaming through the proton beam duct is a primary concern for component activation in ADS.
    • Existing shielding may be insufficient, necessitating design improvements for magnets and shield plugs.
    • Further investigation into secondary photon contributions and refined cross-section data is recommended.