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Uranium products
VVER pellets containing burnable absorbers
| Item |
Specification |
| Conventional U-235, % |
1.0 - 4.45* |
| Uranium isotopes, % |
>87.9* |
| Total Hydrogen, % |
<0.00006 |
| Summary Boron Equivalent (SBE), % |
<0.0002 |
| Density, g/cm3 |
10.4 - 10.7* |
| Sintering test (thermal stability of dimensions, % |
0.0 - 0.04* |
| Volume fraction of open pores, % |
<0.5* |
| Average grain size, mm |
10 - 25* |
| Maximum diameter of an individual pore as a microsection metallographic specimen, mm |
100 |
| Fraction of pores with effective size of 1 to 10 mm observed in the microsection metallographic specimen, % |
>85* |
| Total impurities, % |
0.2* |
* Specification could be revised upon the Customer's request
| Impurity, ppm to U, max. |
| Element |
Specification |
Element |
Specification |
Boron (B)
|
0.3
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Aluminum (Al)
|
30 |
Iron (Fe)
|
150
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Calcium (Ca)
|
50 |
Silicon (Si)
|
30
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Magnesium (Mg)
|
10 |
Manganese (Mn)
|
3
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Tungsten (W)
|
50 |
Copper (Cu)
|
5
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Vanadium (V)
|
30 |
Nickel (Ni)
|
40
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Cadmium (Cd)
|
0.3 |
Chromium (Cr)
|
50
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Molybdenum (Mo)
|
30 |
Nitrogen (N)
|
30
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Phorphor (P)
|
35 |
Carbon (C)
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20
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Zinc (Zn)
|
50 |
Fluorine (F)
|
5 |
Gadolinium (Gd)* |
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| Chlorine (Cl) |
5 |
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* Gadolinium (Gd) value shall meet specification of the Customer.
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