T, Yoshida Japan Atomic Energy Research Institue, Tokai Research Establishment 2-4 Shirakatashirane, Tolkai-mura, Naka-gun, Ibaraki-ken, 319-1195 Japan Wao'98 Scheduling Abstract The JAERI tandem accelerator was completed in 1982. The accelerator has run more than 4000 hours every year after 3 years from the establishment of the accelerator In 1995, we installed a super-conducting booster for increasing ion beam energies from the tandem accelerator. The accelerator is operated for 3 to 4 months continuiously and 1.5 months is intermitted to examine the accelerator.