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Iwamoto, Yosuke
no journal, ,
The radiation damage model in the Particle and Heavy Ion Transport code System (PHITS) has been developed with contribution of the secondary particles created from the sequential nuclear reactions. For the high-energy proton incident reactions, a target PKA created by the secondary particles was more dominant than a target PKA created by the projectile. To validate prediction of DPA values in metals irradiated by 
100 MeV protons, we developed a cryogenic proton irradiation device with a Gifford-McMahon cryocooler to cool wire samples. By using this device, the defect-induced electrical resistivity changes related to the DPA cross section of copper, aluminum and tungsten were measured under irradiation with 100 - 400 MeV protons at cryogenic temperature. A comparison of the experimental data with the calculated results indicates that results with new model (arc-dpa) provide better quantitative descriptions of the DPA cross section than results with conventional model (NRT-dpa).
Maekawa, Fujio
no journal, ,
Accelerator Driven nuclear transmutation System (ADS) which is efficient to reduce high-level rad-waste is outlined.
Okubo, Nariaki
no journal, ,
Research and development of ADS have been done by JAEA. The transmutation of long life radioactive nuclides including in fuel waste is expected to reduce the mass of radioactive wastes. The ADS adopts liquid lead bismuth eutectic (LBE) for both spallation target and coolant for the non-critical core. Irradiation and corrosion behaviors of steel materials in LBE are one of the important issues. Material issues for the ADS beam window and the present activities for material will be presented.
Nagae, Yuji
no journal, ,
no abstracts in English
Takamizawa, Hisashi
no journal, ,
no abstracts in English
Saito, Shigeru
no journal, ,
Beam window and structural materials for spallation neutron source and ADS are damaged by irradiation with high energy protons and spallation neutrons. In order to clarify the radiation damage characteristics of materials under spallation conditions, irradiation programs such as STIP (SINQ Target Irradiation Program) and MEGAPIE (MEGAwatt Pilot Experiment) are centered on the Swiss Paul Scherrer Institute (PSI) in Switzerland. In these programs, various materials have been irradiated with 580 MeV protons at PSI accelerator, and the participating countries share the PIE. JAEA also transported some of the irradiated samples and conducted PIE. In this presentation, we will introduce the characteristics of the spallation environment, the outline of these material irradiation programs, and the typical results and knowledge obtained by PIE.