Mongolian Delegation (Leader: Prof. Davaa, National University of Mongolia, Director of Nuclear Research Center) visited Japan for nuclear reactor investigation from 10 to 17 May, 2008. They visited CRINES on Monday 12 May and discussed on small reactor program in Mongolia and future collaboration between Nuclear Research Center and CRINES. They visited Hokkaido from 13 to 15 May. Prof. Sekimoto joined this trip partly. On Friday 16 May they visited Kyoto University Research Reactor Institute (KURRI) escorted by Prof. Sekimoto and Prof. Minato. Prof. Mishima (Vice Director, KURRI) and Prof. Nakajima (KURRI) gave lectures on facilities and research activities in KURRI, and made a guided tour of research reactor (KUR), critical assemblies (KUCA) and accelerator for ADS (FFAG).