CALCULATIONS OF SHUTDOWN DOSE RATE FOR THE TPR SPECTROMETER OF THE HIGH-RESOLUTION NEUTRON SPECTROMETER FOR ITER

Area of Science:

• Nuclear engineering
• Radiation safety
• Computational physics

Background:

• The ITER project requires advanced neutron detection systems.
• Structural materials in neutron environments can become activated, posing safety concerns.
• Accurate prediction of neutron-induced activity is crucial for operational safety.

Purpose of the Study:

• To predict neutron-induced radioactivity in structural materials for the ITER's High-Resolution Neutron Spectrometer.
• To estimate shutdown dose rates in specific components (Cuboid #1).
• To verify compliance with International Commission on Radiological Protection (ICRP) and ITER safety regulations.

Main Methods:

• Utilized MCNP (Monte Carlo N-Particle) code for neutron transport simulations.
• Employed FISPACT-II code for activation and decay calculations.
• Performed dose rate estimations based on calculated material activities.

Main Results:

• Calculated neutron-induced activity levels for proposed structural materials.
• Estimated shutdown dose rates for Cuboid #1.
• Determined that the calculated dose rates meet ICRP and ITER nuclear safety requirements for accessible areas.

Conclusions:

• The selected structural materials and the TPR spectrometer design are suitable for the ITER environment.
• The predictive calculations confirm adherence to stringent radiation safety standards.
• MCNP and FISPACT-II are effective tools for assessing nuclear safety in fusion reactor components.