Krishnan, T S (1969) Analytical quality Control in the Production of Nuclear grade Zirconium and its Alloys. In: UNSPECIFIED.
THE chief application of zirconium metal and zircaloys is in nuclear reactor engineering as cladding material for the fuel elements and as structural material in the construction of reactor cores . The selection is based on considerations ' of low neutron absorption cross section, fabricability, corrosion resistance and mechanical strength at elevated temperatures. These properties are, however , sensitive to impurity levels and alloying compositions . For example , for neutron economy the hafnium and boron contents should be within 200 ppm and 0'5 ppm respectively : for corrosion resi-stance the aluminium , carbon and nitrogen tolerances are respectively only 75 ppm , 500 ppm and 50 ppm ; and for ease of fabrication the maximum permissible oxygen content is 1500 ppm. In the large scale production of zirconium sponge and zircaloy ingots, it becomes there-fore essential to have a strict control of impurity levels in the successive stages of the batchwise production , in order to ensure consistency of quality and performance in the finished product.
|Item Type:||Conference or Workshop Item (UNSPECIFIED)|
|Uncontrolled Keywords:||Corrosion resistance, Aluminium, Carbon, Nitrogen|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||13 Sep 2011 13:35|
|Last Modified:||13 Jan 2012 12:15|
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