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Report No.
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Application and validation of particle transport code PHITS in design of J-PARC 1 MW spallation neutron source

Harada, Masahide   ; Maekawa, Fujio  ; Oikawa, Kenichi   ; Meigo, Shinichiro   ; Takada, Hiroshi   ; Futakawa, Masatoshi  

In the previous stage of the JSNS design, there was no reliable and convenient nucleon and meson nuclear particle transport code in the energy region above 20 MeV. Therefore, with the progress of the J-PARC project, the NMTC/JAM code (the PHITS code in present) had been developed. Aiming to the best neutronic performance, the PHITS code was fully applied to JSNS neutronics designs and several thousand calculation cases were done with complicated models for neutronic performance, shielding calculation, nuclear heat estimation and so on. JSNS is one of the first facilities in the world fully adapted such a simulation code to the neutronics design. In these calculations, note that the particle energies change by 12 decades and neutron fluxes reduce by 10 decades. To confirm the reliability of these calculations, neutron spectral intensity, radiation dose, residual radio-activity and so on were measured. As a result, the measured values were good agreement with the calculated values.

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