Properties of low activation ferritic steel F82H IEA heat. Interim report of IEA round-robin tests. 1

F82H has been developed by JAERI and NKK Co.Ltd. as a low activation ferritic steel for a nuclear fusion reactor, such as prototype reactor and beyond. We have evaluated the properties of this material including the neutron irradiation effects using JAERI reactors (JRR-2, JMTR) and HFIR at ORNL. F82H also had been chosen as a reference material for the round-robin testing planned by the IEA workshop on the low activation ferritic/martensitic steels. These round-robin tests are conducted by several research groups in Japan, European Union, and the United States. The results for the Japanese share of IEA round-robin tests have been obtained, and are summarized in this report. Several properties, such as microstructure, mechanical properties, and physical properties have been obtained. The results are important for the estimation of the possible availability as a fusion reactor material and for the improvement of this material. Data accumulation and the preparation of the database are quite important for the reactor design activity. (author)