ELFT HÍRADÓ

[Nguyen Quang Chinh <chinh AT metal.elte.hu>]

           ELTE Fizikai Intézet, Anyagfizikai Tanszék

                      TANSZÉKI SZEMINÁRIUM

               2014. szeptember 23., kedd, 8:30-kor
      ELTE Pázmány Péter sétány 1/A alatti épületében,
                    4.52 (Sas Elemér) teremben

                      Előadó: Constanza P. Buioli

Departamento de Tecnología de Aleaciones de Circonio-Centro Atómico Ezeiza
(CAE)-Comisión Nacional de Energía Atómica (CNEA)-Buenos Aires-Argentina


           MICROSTRUCTURAL & METALLURGICAL STUDY OF NUCLEAR
               STRUCTURAL COMPONENTS OF Zr-BASED ALLOYS

Abstract: In the core of CANDU (Canadian-Deuterium-Uranium) nuclear  
power reactors, pressure tubes are one of the most important Zr-based  
alloys structural components. The nuclear reactions occur in fuel  
channels within the tubes, and heat is extracted by pressurized water  
flowing through the channels. The mechanisms defining the service life  
of pressure tubes are: irradiation-enhanced coming with deformation,  
and the delayed hydride cracking. Both processes are determined by  
metallurgical parameters which must be controlled: microstructure,  
dislocation density and texture. Argentina has one CANDU power plant  
in operation since 1982 (CNE), which is now close to ending its  
service life. A refurbishment project is underway which will include  
the replacement of existing fuel channels, composed by Zr-2.5%Nb  
pressure tubes and Zircaloy2/4 calandria tubes. CNEA is developing a  
new manufacturing route for pressure tubes, using a cold rolling  
pilger type machine instead of the cold drawing process currently  
performed in Canada.



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