Samples have been trepanned from the fuel and interstitial channel walls of PGA graphite reactor cores of two operating Magnox gas cooled power stations after a period of service. These samples have been considered explicitly for the presence of deposits on the channel facing surfaces. A combination of focused ion beam milling and imaging has been used to determine the presence of such deposits and where present to make measurements of the thickness. These thicknesses vary from a few nanometres to tens of micrometres. In addition, both the chemical composition and chemical state have been investigated using energy dispersive X-ray microanalysis in a scanning electron microscope and Raman spectroscopy respectively. The results are discussed by comparing the microstructure, composition, chemical state and origins of the deposits with the parent graphite.
|Title of host publication||Modelling and Measuring Reactor Core Graphite Properties and Performance|
|Publisher||Royal Society of Chemistry|
|Number of pages||11|
|Publication status||Published - 2013|