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Various types of nuclear fuel cladding of initial cladding thickness 5 4 0 microns have been exposed to high temperature water in reactor environments and

Various types of nuclear fuel cladding of initial cladding thickness 540 microns have been exposed to high temperature water in reactor environments and the amount of corrosion in each case (corrosion layer thickness) is plotted below.
It is known that the Pilling Bedworth ratio for zirconium oxide formation is 1.56, the Zr atomic mass is 91 and that of oxygen is 16. The density of Zr is 6.5gcm3 and that of ZrO2 oxide is 5.68gcm3.
For the point in the red and blue circles, what would be the hydrogen content in wt. ppm if:
a) the hydrogen pickup fraction was 15%(10)
b) if the hydrogen pickup fraction was 100%?(5)
c) the points in the plot span a wide variety of corrosion thicknesses. What in your view are some of the possible reasons for the differences in corrosion rates?(5)
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