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Пример поддельного документа
Bars
|
Bars, like tubes are the necessary structural material in the production of fuel elements and fuel assemblies (FA) of nuclear reactors. Fuel plugs and various elements of FA are made of them as well.
Bars are made as cold-worked, hot-worked, cast, hot-pressed, cold rolled, forged (by cold forging method) bars of 4.5 to 81 mm in diameter, and 7400 mm in length at CMP, JSC.
Bars are made of zirconium alloys with niobium content of 1 % to 2.5 %, and of E635 alloy. Material of bars is corrosion-resistant. The bars are divided into two types: with normal and with higher accuracy according to the degree of manufacturing accuracy.
Mechanical properties of bars
Mechanical properties of bars are given in Table 1.
Table 1
| Testing temperature | Mechanical properties | ||
|
Ultimate tensile strength, бv,
N/mm2 (kgf/mm2) not less than |
Yield strength, б0,2
N/mm2 (kgf/mm2) not less than |
Percentage elongation
% not less than | |
| 300°С | 295 (30) | 195 (20) | 15 |
Bar dimensions
Geometrical dimensions of the normal accuracy and the maximum deviations of tubes are given in Table 2.
Table 2
| Diameter, mm | Length, mm |
Straightness tolerance of the generating line of the bar for 1m length
mm, not more than | Kind of treatment | ||
| Nominal | Limit dev. | Nominal | Limit dev. | ||
| 4.5 | -0.10 | 500 to 1500 | +5.0 | 5.0 | drawn |
| 9.0 | +0.15 | not less than 1500 | - | 1.5 | rolled |
| 9.6 | +0.15 | not less than 200 | - | 1.5 | rolled |
| 12.0 | -0.30 | 7410 | +50.0 |
| rolled |
| 13.2 | ±0.20 | not less than 1500 | - | 1.5 | rolled |
| 14.0 | ±0.15 | 200 - aliquot | +10.0 | 1.5 | rolled |
| 14.3 | ±0.20 | not less than 1500 | - | 1.5 | rolled |
| 20.0 | ±0.20 | not less than 1500 | - | 5.0 | rolled |
| 22.0 | ±0.25 | not less than 1500 | - | 5.0 | rolled |
| 23.0 | ±0.30 | not less than 1500 | - | 5.0 | rolled |
| 27.0 | ±0.30 | not less than 1500 | - | 5.0 | rolled |
| 30.0 | ±0.30 | not less than 1500 | - | 5.0 | rolled, extruded |
| 35.0 | ±0.30 | 380 - aliquot | +5.0 | 5.0 | rolled, extruded |
| 62.0 | +3.00 | 2510 | +30.0 | not subject to inspection | rolled, extruded |
| 80.0 | ±0.50 | upon request | +1.0 | not subject to inspection | rolled, extruded |
| 81.0 | +2.50-1.50 | 180 - aliquot | +10.0 | not subject to inspection | rolled, extruded |
Geometrical dimensions with the higher accuracy and the maximum deviations of tubes are given in Table 3.
Table 3
| Diameter, mm | Straightness tolerance of the generating line of the bar | Length, mm | Kind of treatment | |||
| Nominal | limit deviations | |||||
| Group А | Group B | Group C | ||||
|
9.6
13.0 | +0.040 | ±0.020 | -0.040 | 1.0 | 1,500 to 2,500 incl. | rolled |
|
8.7
9.6 13.0 | Все группы - 0.050 | drawn | ||||
Bars of other dimensions are made by agreement with the customer. Ovality of the bars is within the tolerance for diameter.
Inspection
Bars are subject to radiographic and ultrasonic testing for the absence of discontinuities.
Packaging and marking
Bars are packed in a wooden or metal tare (boxes, containers). Bar packaging prevents them from moving inside the container, contamination, damage of the surface, and distortion of shape.
Transportation marking is performed according to GOST 14192-77 with application of manipulation signs and indication of the manufacturer, net weight, gross weight, alloy grade, number of melt (lot), diameter of bars, and the address of the customer.
Transportation and storage
Bars can be transported in packed form by all types of transport. When transporting, the bars are protected against mechanical damage, ingress of moisture and exposure to active chemical substances.
The bars are stored in packed form in closed premises, which exclude mechanical damages of bars, ingress of moisture onto them and the exposure to active chemical substances.
Zirconium crystal bars
Iodide zirconium in the form of zirconium crystal bars with pseudocrystalline surface (Van Arkel bars) is a specific type of product. This is the utmost pure zirconium. It is obtained by method of iodide refining of conventional zirconium metal turnings.
Dimensions
Impurities content (ppm or parts per million), not more than
| Hf Hafnium | 500* | Fe Iron | 300 |
| Si Silicon | 80 | Cr Chromium | 200 |
| Al Aluminium | 50 | Cd Cadmium | 0.5 |
| Ni Nickel | 100 | Li Lithium | 2 |
| Cu Copper | 30 | Mo Molybdenum | 50 |
| Be Beryllium | 10 | O Oxygen | 500 |
| Ca Calcium | 200 | С Carbon | 80 |
| Mn Manganese | 10 | N Nitrogen | 50 |
| Ti Titanium | 50 | Sn Tin | 500 |
| Pb Lead | 50 | Nb Niobium | 100 |
| B Boron | 0.5 |
* may be less than 100 ppm
Marking
Marking is applied onto the cover of the box with water resistant paint. Marking includes a product name, batch number, and weight, net and gross, name of the manufacturer.
Package and transportation
Bars are packed in wooden boxes by 500 kg per each box. Batch size is not more than 1,000 kgs. Zirconium crystal bars can be transported in packed form by all types of transport. When transporting, the bars shall be protected from mechanical damage, precipitation and active chemical substances.