Shielding calculations of PWR using JSNT code

Reactor shielding calculations is the foundation for assessing nuclear plant safety performance. It is also an important method to provide guidelines for constructions and operations of nuclear plant. JSNT is a massively parallel discrete ordinates transport code developed by CAEP software center for high performance numerical simulation, with high simulation precision and efficiency. In this paper, a commercial PWR has been modeled and simulated using JSNT code. Flux distributions are obtained and compared with experimental measuring results. Comparisons show that results obtained by both S₈ and S₁₆ calculations could satisfy engineering demand. Moreover, in comparison to S₈ calculation, S₁₆ could improve the calculation precision significantly and decrease relative errors of some detectors under 1%.