DEVELOPMENT OF MPACT FOR FULL-CORE SIMULATIONS OF MAGNOX GAS-COOLED NUCLEAR REACTORS Brian J. Ade, Nicholas P. Luciano, Andrew J. Conant, Cole A. Gentry, Shane G. Stimpson, Benjamin S. Collins, Kang Seog Kim and Robert Mills EPJ Web Conf., 247 (2021) 06041 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124706041