Within the International Atomic Energy Commission (IAEA) coordinated program on the optimizing of reactor pressure vessel surveillance programs and their analysis, Phase 3, a specially tailored "radiation sensitive" correlation monitor material has been fabricated. This material will serve as a reference to the IAEA program for future vessel surveillance programs throughout the world.

An extensive evaluation of the correlation monitor material in the as-received condition has been carried out in Finland and the results are presented here. The mechanical properties measured at different temperatures include Charpy V-notch and instrumented precracked Charpy data, and elastic-plastic fracture toughness (J and T). The specimen size and geometry have been varied in the tests. Correlation between different fracture properties are evaluated and discussed.