Thermal Cycling of Activity Cooled Be/CuCrZr and Be/GlidCop Mock-ups in a Core of Nuclear Reactor

摘要

Proposing beryllium as plasma facing armour and fast brazing as Be/Cu-alloy joining technique, this paper presents the recent experimental results. It was shown that fast brazing of Be onto both PH-copper like CuCrZr and DS-copper like GlidCop provides reliable joint that does not failure under heat flux up to melting of Be surface. Investigating the influence of neutron irradiation on Be/Cu-alloy joint behaviour, in-pile integrated test in a core of nuclear reactor CM-2, Dimitrovgrad, Russia was carried out. In this test actively cooled Be/CuCrZr and Be/GlidCop joints were simultaneously subjected to high heat flux (1000 cycles, ～7.5 MW/m~2) and neutron irradiation (total fluence 2.8xl0~(20) n/cm~2, -0.13 dpa). Both type of tested joints successfully survived applied heat and neutron loads. Optic and TEM metallography before and after irradiation as well as microhardness measurements are presented and discussed.