For a fuel supply from the SDS to the tokamak in the ITER. the SDS beds' operation was designed. From ond SDS bed. 20Pam3/s average delivery rate was designed as the required number of SDS beds didn't increase at over 20Pam3.s because of the limit of maximum 100g tritium storage per SDS bed. For the supply of 50Pam3/s 90T-10D or 200Pam3/s 50T-50D for 450 sec. SDS beds supply 90T-10D or 50T-50D into the SDS reservoir for the first and second shots and the ISS suppolies 90T-10D or 50T-50D into the reservoir for the first shot and the ISS supplies into SDS reservoir after the first shot. After delivery of 90T-10D or 50T-50D, the amount of remaining tritium is measured by using a He loop.