Current status of JAERI spallation target material program

In the joint project of spallation neutron source between JAERI and KEK, ma terial technology has been developed for the mercury target in the neutron source facility, the lead-bismuth target in the transmutation test facility , superconducting accelerator, post-irradiation examination and the ion bea m test. Design of target system is progressing for the mercury spallation t arget: a pressure test of moderator, an impacting test in mercury and a cor rosion test have been carried out. For nuclear transmutation with ADS an en gineering facility is proposed. A material corrosion test loop is built-up and SS316 and F82H steels are to be tested in a flowing Pb-Bi. Fracture tou ghness of superconducting cavity material was found to be considerably larg e at 4 K. Irradiated samples at SINQ are to be transported to JAERI Hot Lab oratory. For simulating radiation damage small disk specimens were irradiat ed in single, dual and triple ion beam modes. (C) 2001 Elsevier Science BN. All rights reserved.