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