- Created on Friday, 21 May 2010 21:35
The South African Pebble Bed Modular Reactor (PBMR) and its fuel
The lecture will be held by professor Johan B. Malherbe, University of Pretoria, South Africa, at 13:00 on 28th of May , room D244 (2nd floor of D building on Department of Power systems, FER Zagreb).
PBMR design of the nuclear reactor provides a modular solution of low installed power and additional reliability.
More information about the lecture and the presenter can be found if you read the full article by clicking on the read more button.
One of the new inherently safe designs in nuclear reactors is the pebble bed modular reactor (PBMR). This talk will give some salient features of the South Africa design of the PBMR. Special attention will be given on the design and functions of the fuel particles which is on the form of small multilayered spheres, called TRISO particles. These coated particles consist of a UO2 kernel surrounded by four layers, which are all CVD deposited. The layers are a buffer graphite layer next to the kernel followed by an inner pyrolytic carbon layer (IPyC), a SiC layer and finally an outer pyrolytic carbon layer (OPyC). Because the coated particles operate in a very harsh environment (e.g. high temperatures with repeated rapid cooling and heating-up times, high flux neutron irradiation, containment of the radioactive fission products) the microstructure and composition of the layers are extremely important to preserve the integrity of the particles.
Johan Malherbe is professor of physics and head of the department of physics at the University of Pretoria.
His field of expertise is in surface analysis and ion-solid interactions, in which he had been invited to write several review papers and give invited talks.
Lately he has been contracted to do research on several aspects of the fuel used in the PBMR.