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MECHANICAL FATIGUE TESTS OF SEU-43 FUEL BUNDLE CLADDING AT 400°C

Vol. 7, Issue 1, pp. 151-158 (2021), DOI: 10.37410/EMERG.2021.1.12
Valentin OLARU, Elena MATEI, Alexandru NITU, Livia STOICA, Denisa TOMA, Mirela MATEI

Abstract

Acest articol prezinta metoda de testare a probelor prelevate din tuburi de Zircaloy-4 (conditia metalurgica “in stare de livrare”), utilizate pentru intecuirea combustililului fasciculelor inovative CANDU SEU-43. Aceste teste sunt menite sa simuleze comportamentul tecilor intr-un proces de ciclaj de putere in interiorul reactorului. Testarea la oboseala este de tip oligociclic, in afara reactorului, efectuata pe probe de tip “C-ring”, care sunt incercate mecanic la amplitudinile totale ale deformarii de 1%, 2% si 3%, la o temperatura de 400°C. Pentru determinarea defromatiilor pentru ambele tipuri de tub (diametru mic si mare), s-a efectuat o simulare numerica, folosind analiza cu elemente finite in codul comercial ANSYS.

This paper presents the testing method of samples worked from Zicaloy-4 tubes (“as-received’’ metallurgical state), utilized as cladding for the new CANDU SEU-43 fuel bundle. These tests are intended to simulate the cladding’s behavior in a power cycling process inside the reactor. The testing process is of low cycle fatigue type, done outside of the reactor, on “C-ring” samples, which are mechanically tested at 1%, 2% and 3% total amplitude deformation, at a temperature of 400°C. To determine the deformation for both types of tube (small and big diameter), a numerical simulation was done, using a finite element analysis in the ANSYS commercial computer code.

Keywords

fatigue, CANDU SEU-43, Zircaloy-4, ANSYS

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