Method for measuring lanthanide content dissolved in uranium oxide
AssigneesKorea Atomic Energy Research Institute, Korea Hydro & Nuclear Power Co., Ltd.
InventorsKeon-Sik Kim, Jae-Ho Yang, Kun-Woo Song, Ki-Won Kang, Youn-Ho Jung
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Abstract
The present invention relates to a method for measuring the content of Lanthanides dissolved in uranium oxide, wherein the Lanthanides content in the nuclear fuel pellet is measured using the thermo gravimetric analysis which measures the weight variation caused by the oxidation and heat treatment of the nuclear fuel pellet. This method provides an advantage in that the Lanthanide content can be measured using relatively simple equipments such as an electric furnace and a balance.
Claims4
A method for measuring a La content dissolved in a (U,La)O2 nuclear fuel pellet, wherein the method comprises a step of;
- measuring the weight (W1) of (U1−xLax)3O8 powder obtained by oxidizing a (U1−xLax)O2+z pellet in an oxidizing gas atmosphere at a temperature of 300–950° C. (step 1),
- measuring the total weight (W2) of (U1−yLay)O9/4 phase and U3O8 phase obtained by heat treating the (U1−xLax)3O8 powder in an oxygen-containing gas or an inert gas atmosphere at a temperature of 950–1800° C. (step 2), and
- measuring the La content using the following equation 1(step 3)
- W
- 1
- -
- W
- 2
- W
- 1
- =
- M
-
-
- W
- O
- 2
- ×
- (
- 5
-
- x
- 24
-
- y
- )
- M
-
-
- W
- (
- U
- 1
- -
- x
-
- La
- x
- )
-
- O
- 8
- /
- 3
- (
- Equation
-
-
- 1
- )
- wherein
- MW02 is the O2 molecular weight,
- MW(U1−xLax)08/3 is the (U1−xLax)O8/3 molecular weight,
- x is the La content dissolved in (U,La)O2, and
- y is the La cation content dissolved in the (U,La)O9/4 phase.
A method for measuring the La content dissolved in a (U,La)O2 nuclear fuel pellet, wherein the method comprises steps of;
- measuring the weight(W0) of a (U1−xLax)O2+z nuclear fuel pellet(step 1),
- measuring the total weight (W2) of(U1−yLay)O9/4 phase and U3O8 phase obtained by heat treating (U1−xLax)3O8 powder in an oxygen-containing gas pr am omert gas atmosphere at a tmeperature of 950–1800° C. (step 2), and
- measuring the La content using the following equation 2(step 3)
- W
- 0
- -
- W
- 2
- W
- 0
- =
- M
-
-
- W
- O
- 2
- ×
- (
- 5
-
- x
- 24
-
- y
- +
- z
- 2
- -
- 1
- 3
- )
- M
-
-
- W
- (
- U
- 1
- -
- x
-
- La
- x
- )
-
- O
- 2
- +
- z
- (
- Equation
-
-
- 2
- )
- wherein,
- MW02 is the O2 molecular weight,
- MWU1−x)o2+z is the (U1−x)Ohd 2+z molecular weight,
- x is the La content dissolved in(U,La)O2,
- y is the La cation content dissolved in the (U,La)O9/4 phase, and
- z is the value when the O/(U+La) rate of the initial sample is higher than 2.
Dependencies are inferred from the claim text.