F.Vermeersch SCK•CEN
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Transcript of F.Vermeersch SCK•CEN
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
Investigate the applicability of 3D dose simulation tools for a fusion power plant
Operation Maintenance Decommissioning
Aim
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
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)
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.
Example Eq. Port 1
Simplified Model of Eq.Port 1
Simplified source structure for demonstration
Sources include nose section beam line and port flange and port section
Evolution of the radiation field during the maintenance work
Removal 5 mRemoval 3 m
Evolution of the radiation field during the maintenance work
Nose section removedNose section shielded
Dose uptake by the workers
Unshielded nose section
Dose uptake by the workers
Nose section shielded by lead
Dose uptake by the workers
Nose section removed
Effect of shielding the port flange
Without shielding With shielding
Dose uptake by the workers
Without shielding With shielding
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
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.