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F.Vermeersch SCK•CEN

Radiation Protection optimisation 3D planning tools and their applicability to occupational exposure at a fusion power plant. F.Vermeersch SCK•CEN. EFDA 27 juni 2006. EFDA monitoring meeting. Aim. Investigate the applicability of 3D dose simulation tools for a fusion power plant Operation

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F.Vermeersch SCK•CEN

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  1. Radiation Protection optimisation3D planning tools and their applicability to occupational exposure at a fusion power plant F.Vermeersch SCK•CEN EFDA 27 juni 2006 EFDA monitoring meeting

  2. Aim • Investigate the applicability of 3D dose simulation tools for a fusion power plant • Operation • Maintenance • Decommissioning

  3. Context • ALARA is part of the safety culture • ALARA evaluation can be very complex • 3D tools have shown their effectiveness in nuclear industry (fission) • How can we apply this technology in the Fusion Power Plant environment

  4. Dose assessmentDose optimisation • Dose assessment is currently based on average dose rates in an area. • 3D simulation could be used to evaluate • The effect of non-uniform dose distributions • The introduction of shielding • The effect of design changes • The dose distribution in a changing environment (maintenance, decommissioning)

  5. Can we apply this technology to occupational exposure in the Fusion domain ? • Method • Identify typical exposure problems in a fusion installation where this technology where can have an added value (literature study, discussion with designers). • Setting up a small application for demonstration. • Evaluate the in and output • Evaluate the communication, education and training aspects.

  6. Example Eq. Port 1

  7. Simplified Model of Eq.Port 1 Simplified source structure for demonstration Sources include nose section beam line and port flange and port section

  8. Evolution of the radiation field during the maintenance work Removal 3 m Removal 5 m

  9. Evolution of the radiation field during the maintenance work Nose section shielded Nose section removed

  10. Dose uptake by the workers Unshielded nose section

  11. Dose uptake by the workers Nose section shielded by lead

  12. Dose uptake by the workers Nose section removed

  13. Effect of shielding the port flange With shielding Without shielding

  14. Dose uptake by the workers With shielding Without shielding

  15. Next steps • Better definition of the sources • Better definition of the required information • Simulation of the operation at eq. port 1 • Increase the detail of the model • Dose assessment for the whole operation. • Suggestions for dose reduction

  16. Conclusion • The use of simulation and 3D representation of the workplace and radiation risks enables • A better communication during the pre-job ALARA studies between the stakeholders. • An implicit training of the ALARA analyst (more scenarios can be tested) • A better final preparation of the worker. • A better awareness of the residual risk and the radiation protection measures put into practice.

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