GB/T 11840-1989 Determination of moisture content of uranium dioxide pellets

GB/T 11840-1989 Determination of moisture content of uranium dioxide pellets GB/T11840-1989 Standard download decompression password: www.bzxz.net

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Determination of moisture in uranium dioxide pellets
1 Subject and scope of application
This standard specifies the determination method for moisture content in nuclear grade uranium dioxide pellets. GB11840--B9
This standard applies to the determination of moisture content in nuclear grade uranium dioxide pellets. The determination of moisture content in other uranium dioxide pellets, such as uranium dioxide pellets, can also be referred to. The detection limit is 10μg. 2 Method summary and principle
2.1 The sample is heated in a furnace at a temperature of 40)°C to drive out moisture, and is carried to the electrolytic cell by a dry nitrogen stream for electrolysis. The micrograms of moisture are directly detected by the electrolysis electricity. 2.2 Care must be taken to avoid interference from the following substances: corrosive gases such as hydrogen fluoride, hydrogen nitride, fluorine, nitrogen, acidic gases, argon and other volatile substances, hydrogen and alcohol substances. Also prevent liquid and solid substances from being brought in from the gas. 3 Reagents
3.1 BaCl2H2O 3.2 Nitrogen purity above 99.5%.
4 Equipment
4.1 The analyzer for analyzing solid samples includes a heating furnace (0-000°C), an electrolytic cell, a flow meter (30-140 ml/min) and a dryer.
4.2 The sample weighs 100 g and has a sensitivity of 1.
5 Sample
The conditions for handling and injecting the pellet sample should be the same as those for loading into the cladding tube. 6 Analysis steps
6.1 Turn on the power.
6.2 Regulate the nitrogen pressure to 40 ± 5 ka and the flow rate to 0-80 mL/min 6.3 Adjust the zero adjustment knob of the water analyzer to make the blank value 0.7~0.8ug/min (7~8s.0.1ug). 6.4 Open the bottom of the water analyzer and remove the end of the quartz furnace tube. 6.5 Use tweezers to load 3 pieces of core samples (about 20g, read the reading to the third decimal place when weighing), and then insert the tweezers into the middle of the resistance wire of the heating furnace.
6.6 Plug the end plug and cover the instrument cover.
6.7 Pass nitrogen for 10 minutes.
6.8 Reset the test number to zero.
6.9 Set the furnace temperature to 400°C.
State Administration of Technical Supervision 1989-10-2 1 Approved for implementation on August 1, 1990
GB11840-89
6.10 Set the timer to 1h. When the timer reaches the preset time, the counter stops counting and the reading C is recorded. 6.11 Under the same conditions, measure the blank value B without adding sample. Calibration of the instrument
7.1 Use a dry empty nickel boat to measure the blank value at 150℃ for 20min according to the analysis steps until a constant value is obtained (6.6 and 6.8 in the analysis steps are cancelled).
7.2 Repeat the analysis of the weighed pieces. If the following mg B&CI22H,0.8 Calculation
8.1 Calculate the moisture recovery rate according to formula (1):
Z = (AH) /147,2 Y
Formula: A——Instrument reading when measuring BaCl22H,0, B-—Instrument reading when measuring blank value, μ! Y-—Weight of BaCl22H,0, mg. 1mgBaCl22H,0 contains 147.2ugH,0. 8.2 Calculate the water content in the sample according to formula (2): Ho (ug/g) = (CH /Wz.
W——sample weight, B——blank count, omitted;
W——sample weight, &!
B The recovery rate when calibrating the instrument with standard substances. 9 Precision
When the moisture content of uranium dioxide pellets is at the g/level, the relative standard deviation is ±10%. Additional remarks:
This standard was proposed by China National Nuclear Corporation. This standard was drafted by the Fourth Institute of the First Research and Design Institute of China National Nuclear Corporation. The main drafters of this standard are Shen Hong, Dai Shouhui and Zhu Shuan. (1)
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