14 MeV neutron streaming calculations for JET-like maze entrance using TRIPOLI-4 Monte Carlo code
Résumé
For the future ITER (International Thermonuclear Experimental Reactor) operation needs, D-T fusion
experiments named DTE2 will be conducted in 2019 at JET (Joint European Torus). During the DTE2 operations,
14 MeV fusion neutrons will be generated. One of the aims of the DTE2 neutronics experiments is to investigate
the D-T neutron streaming along the penetrations of biological shield of the JET Torus Hall. The TRIPOLI-4
Monte-Carlo radiation transport code has been extensively used on radiation shielding analyses. The purpose of this
study is to evaluate the variance reduction (VR) techniques of TRIPOLI-4 on the 14 MeV neutron streaming
calculations for JET-like maze entrance. A JET-like torus hall building of 40 m x 40 m and a maze entrance of 11.8
m length in 5-section configuration of concrete were first modeled. The new developed VR method AMS
(Adaptive Multilevel Splitting) was then presented and discussed. Using the single-step approach combined with
AMS techniques, the TRIPOLI-4 calculations results including neutron flux and ambient dose equivalent maps, the
VR performance, and the user-friendly AMS input of TRIPOLI-4 code were reported.
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