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Nuclear Materials and Corrosion
Objectives:
- Nuclear materials behaviors study in NPP's, under normal, abnormal and severe accident conditions;
- Manufacturing and control technologies for advanced nuclear fuels development.
Activities:
- Technologies establishment for UO2 sinterable powders obtaining;
- Technologies establishment for obtaining of UO2 sintered pellets with controlled microstructure;
- Technologies establishment for targets manufacturing used to radioactive sources in industry and medicine;
- Technologies establishment for end cap-sheath welds and for end cap-end plate welding of experimental fuel bundle;
- Materials developments for extreme conditions - pressure, temperature and neutrons high flow;
- Thermo-mechanical testing of metallic and ceramic materials under different state of stress and environment conditions;
- Structural integrity assessment of metallic components under thermo-mechanical loading and in different environment;
- Reception tests on half-finished alloys;
- Microphysics characterization for surfaces and thin films;
- Experimental fuel bundles manufacturing for out of pile tests;
- Corrosion experiments for the forth generation nuclear applications materials;
- Corrosion surveillance in Cernavoda NPP Unit1 primary circuit by coupons analyses placed in autoclaves assembled in by-pass of Cernavoda NPP;
- Out-of pile corrosion experiments in water chemistry conditions specifically of the normal and abnormal operation on some structural materials from primary and secondary circuit;
- Microbiological corrosion in NPP's;
- Decontamination technologies establishment of NPP components and equipments;
- Decontamination technologies development of components and equipments at NPP decommissioning;
- Site characterization for low and intermediate level waste disposal.
Experimental Facilities:
- Equipments for metallic powder obtaining;
- Small scale equipment for UO2 sinterable powder manufacturing;
- Sintering furnaces;
- Furnace for controlled hydriding;
- Isostatic press;
- Hydraulic presses for UO2 sinterable powder pressing;
- System for mechanical testing;
- Creep Machine;
- Centerless grinding machine;
- End cap-sheaths welding machine;
- End cap-end plate welding machine;
- Static autoclaves of different capacities.
Control Equipments:
- Hydrogen-Oxygen Analyzer;
- Diffractometers;
- Durometer;
- Microdurometer;
- Metallographic Microscopes;
- Electron Probe Microanalyzers;
- Microhite 3D Measuring System;
- Mercury Porosimeter;
- Rugosimeter;
- Plasma mass spectrometer;
- Thermoanalyzer.
Main Achievements:
- Experimental database concerning the corrosion of structural materials for primary and secondary circuit;
- Manufacturing of experimental instrumented fuel elements irradiated in SCN TRIGA Reactor;
- Manufacturing of experimental model advanced fuel bundle;
- Procedure for out of pile low cycle fatigue testing of Zircaly-4 sheaths;
- Testing procedure for zircaloy half-finished components at high temperature and pressure;
- Technology for UO2 sinterable powder manufacturing;
- Technology for UO2 sintered pellets with large grain size obtaining for advanced fuel manufacturing;
- Performances assessment of the site proposed for low and intermediate waste disposal.
Contact: Dr. Dumitru OHÂI; e-mail: dumitru.ohai@nuclear.ro |
