[1H01-05] Fusion Neutron Source and Neutron Irradiation

[1H03] Progress on A-FNS design and R&D

(3) Dose rate assessment due to activated depositions in Li loop of A-FNS

*Shunsuke Kenjo¹, Makoto Oyaizu¹, Masayuki Ohta¹, Saerom Kwon¹, Kentaro Ochiai¹, Satoshi Sato¹ (1. National Institutes for Quantum Science and Technology)

Keywords:Activated deposition, F82H, activation calculation, liquid lithium loop, dose rate

A-FNS aims to produce high energy neutrons corresponding to ones generated by DT fusion reaction by the nuclear reactions between deuterium and Li. In the Li target system, the liquid Li flows on the concave backplate (BP) made of a reduced activation ferritic/martensitic steel F82H. The BP is inevitably activated due to the irradiation with the high energy neutrons. The Li flow enhances the erosion and corrosion, which leads to contamination of the liquid Li with the activated products. These products are assumed to be deposited onto the components in the Li loop. The radioactivity in the BP is calculated using the MCNP and FISPACT codes, and used to assess the dose rate due to the activated depositions.