radiation protection optimisation 3d planning tools and their applicability to occupational exposure...
TRANSCRIPT
Radiation Protection optimisation3D planning tools and their applicability to occupational exposure at a fusion power
plant
F.Vermeersch
SCK•CEN
EFDA 24 October 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.
Identification of typical exposure problems in a fusion installation where this technology where can
have an added value
• No added value When uniform and constant dose rate fields
• Added value when Radiation fields with important gradients Operations with changes of geometry and
radiation field during the operation. Evaluation of dose reducing measures
during hands on operations. In communicating the procedure of the
operation.
Simplified Model of Eq.Port 1
Simplified source structure for demonstration
Sources include nose section beam line and port flange and port section
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
Still to be performed
• Better definition of the sources Information on activated materials received
Raul Pampin• Re calibration of the sources• Re evaluation of the doses
• Finalize the reporting November