METHODS FOR CALCULATION OF SELF-SHIELDED CROSS SECTIONS OF FULLY CERAMIC MICRO-ENCAPSULATED FUEL DOUBLE HETEROGENEOUS SYSTEMQingming He, Wen Yin, Zhouyu Liu, Tiejun Zu, Liangzhi Cao and Hongchun WuEPJ Web Conf., 247 (2021) 03012DOI: https://doi.org/10.1051/epjconf/202124703012