VALIDATION OF SERPENT FOR FUSION NEUTRONICS ANALYSIS AT JET Andrej Žohar, Žiga Štancar, Paola Batistoni, Sean Conroy, Luka Snoj, Igor Lengar and JET contributors EPJ Web Conf., 247 (2021) 18001 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124718001