Evaluation of surface deposits on the channel wall of trepanned reactor core graphite samples
Evaluation of surface deposits on the channel wall of trepanned reactor core graphite samples
复制标题
DOI：
10.1016/j.jnucmat.2013.10.058
复制
发表时间：
2014-02-01
影响因子：
3.1
通讯作者：
Flewitt, P. E. J.
中科院分区：
文献类型：
--
作者：
Heard, P. J.;Payne, L.;Flewitt, P. E. J.
对两座玛格诺克斯气冷电站PGA石墨堆芯的燃料和间隙通道壁进行了钻孔取样。这些样品已被明确考虑在河道面对表面上存在沉积物。聚焦离子束铣削和成像的结合已被用来确定这种沉积物的存在，并在存在的地方进行厚度测量。这些厚度从几纳米到几十微米不等。此外，利用扫描电镜和拉曼光谱分别对其化学组成和化学状态进行了研究。EDX测量显示，在其中一个反应器的沟道壁上发现的表面沉积物中，氧、铁、铬和硫的浓度高于底层物质。拉曼光谱也表明，该矿床具有比PGA石墨更小的晶体尺寸。(C) 2013 Elsevier B.V.版权所有
Samples have been trepanned from the fuel and interstitial channel walls of PGA graphite reactor cores of two 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.EDX measurements showed that surface deposits found on the channel walls of one of the reactors contained increased concentrations of oxygen, iron, chromium and sulphur compared with the underlying material. Raman spectroscopy also suggested that the deposit had a smaller crystallite size than PGA graphite. (C) 2013 Elsevier B.V. All rights reserved.