Reactor materials embrittlement. Foreign trip report, June 21, 1990-June 30, 1990.

摘要

The traveler served as a member of a delegation from the US Nuclear Regulatory Commission in an information exchange meeting on nuclear safety with the USSR in Moscow, USSR, June 25--29, 1990. The meetings were held within the framework of the US-USSR Joint Coordinating Committee on Civilian Nuclear Reactor Safety. The traveler participated in the meetings of Working Group 3 on Radiation Embrittlement of the Housing (Pressure Vessel) and Support Structures, and Annealing of the Housing. This was the second meeting for Working Group 3; the first was held in Washington, D.C., in June 1989 and the traveler has participated in both. The traveler presented results of research on the effects of irradiation on crack-arrest toughness of submerged-arc welds, fracture toughness of stainless steel cladding, and mechanisms of radiation embrittlement in pressure vessel steels. The meetings resulted in detailed exchange of technical progress between participants, identification of specific areas requiring continued research, agreements regarding exchange of additional information, agreements on exchange of reactor vessel materials, and US witnessing of a thermal annealing of a USSR-designed commercial light-water reactor vessel.