[en] Isothermal annealing tests with an alloy of 80% silver, 15% indium and 5% cadmium were performed in flowing argon atmosphere at temperatures ranging from 1073 to 1673 K to improve the understanding the vaporization behavior of the control rod material during the severe accidents of PWRs. The alloy melted in the temperature range between 1123 and 1173 K. And very little vaporization was measured below the melting temperature. The weight loss due to vaporization was 0.5% at 1123 K and 8.2% at 1673K for the annealing time of 3600 s. Cadmium was completely released from the alloy at temperatures above 1173 K, while silver was not released below 1473 K. Cadmium was the most volatile and silver was the least volatile element of the alloy in the examined condition. The tests results indicated that both the release rate of component elements and the total amount of release were strongly time-dependent. (author)