INTRODUCING BURNUP CREDIT FOR EXPANSION STAGE 2 OF THE EXTERNAL SPENT FUEL POOL AT GÖSGEN NPP Axel Hoefer, Martin Basler, Oliver Buss, Gaëtan Girardin, Fabian Jatuff, Lukas Meyer, Leo Ornot, Detlev Rossbach and Wolf Stoll EPJ Web Conf., 247 (2021) 17007 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124717007