Abstract
ABSTRACT The paper summarizes the results of the control blade degradation test CLADS-MADE-02 performed in the Japan Atomic Energy Agency . The test focused on the beginning phase of the accident at Fukushima Dai-Ichi Nuclear Power Plant (1F) Unit 3. The investigation provided important data, especially on the temperature history, exhaust gas measurement, and in situ video of metallic debris formation and relocation to the colder elevations under the test scenario, which reproduced oxidizing conditions during the initial phase of the 1F Unit 3 reactor heat-up. Complementary post-test analysis by metallography, Raman spectroscopy, elemental scanning electron microscope/energy-dispersive X-ray spectrometry spectroscopy, and exhaust gas analysis provided additional data on the local materials interactions that gave insights on the melt progression scenarios. Based on the test results, some decommissioning-related conclusions concerning the formation of new B-rich phases containing Cr and Fe were made.
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