VERIFICATION AND VALIDATION OF BACK-END CYCLE SOURCE TERM CALCULATION OF THE NODAL CODE RAST-K Jaerim Jang, Bamidele Ebiwonjumi, Wonkyeong Kim, Jinsu Park and Deokjung Lee EPJ Web Conf., 247 (2021) 10025 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124710025