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Mechanical Properties of Cubic (U,Zr)O2

[+] Author and Article Information
Toru Kitagaki

Japan Atomic Energy Agency,
Nuclear Fuel Cycle Engineering Laboratories,
4-33 Muramatsu,
Tokai-mura 319-1194, Ibaraki, Japan
e-mail: kitagaki.toru@jaea.go.jp

Takanori Hoshino

Japan Atomic Energy Agency,
Nuclear Fuel Cycle Engineering Laboratories,
4-33 Muramatsu,
Tokai-mura 319-1194, Ibaraki, Japan
e-mail: hoshino.takanori@jaea.go.jp

Kimihiko Yano

Japan Atomic Energy Agency,
Nuclear Fuel Cycle Engineering Laboratories,
4-33 Muramatsu,
Tokai-mura 319-1194, Ibaraki, Japan
e-mail: yano.kimihiko@jaea.go.jp

Nobuo Okamura

Japan Atomic Energy Agency,
Nuclear Fuel Cycle Engineering Laboratories,
4-33 Muramatsu,
Tokai-mura 319-1194, Ibaraki, Japan
e-mail: okamura.nobuo@jaea.go.jp

Hiroshi Ohara

Nippon Nuclear Fuel Development Co., LTD.,
2163 Narita-cho,
Oarai-Machi 311-1313, Ibaraki, Japan
e-mail: ohara@nfd.co.jp

Tetsuo Fukasawa

Hitachi-GE Nuclear Energy, LTD.,
3-1-1 Saiwai-cho,
Hitachi-Shi 317-0073, Ibaraki, Japan
e-mail: tetsuo.fukasawa.gx@hitachi.com

Kenji Koizumi

Japan Atomic Energy Agency,
Nuclear Fuel Cycle Engineering Laboratories,
4-33 Muramatsu,
Tokai-mura 319-1194, Ibaraki, Japan
e-mail: koizumi.kenji@jaea.go.jp

1Corresponding author.

Manuscript received July 14, 2017; final manuscript received February 13, 2018; published online May 16, 2018. Assoc. Editor: Akos Horvath.

ASME J of Nuclear Rad Sci 4(3), 031011 (May 16, 2018) (7 pages) Paper No: NERS-17-1069; doi: 10.1115/1.4039847 History: Received July 14, 2017; Revised February 13, 2018

Evaluation of fuel debris properties in the Fukushima Daiichi nuclear power plant (1F) is required to develop fuel debris removal tools. In the removal of debris resulting from the Three Mile Island unit 2 (TMI-2) accident, a core-boring system played an important role. Considering the working principle of core boring, hardness, elastic modulus, and fracture toughness were found to be important fuel debris properties that profoundly influenced the performance of the boring machine. It is speculated that uranium and zirconium oxide solid solution (U,Zr)O2 is one of the major materials in the fuel debris from 1F. In addition, the Zr content of the fuel debris from 1F is expected to be higher than that of the debris from TMI-2 because the 1F reactors were boiling-water reactors. In this research, the mechanical properties of cubic (U,Zr)O2 samples containing 10%–65% ZrO2 are evaluated. The hardness, elastic modulus, and fracture toughness are measured by the Vickers test, ultrasonic pulse echo method, and indentation fracture method, respectively. In the case of (U,Zr)O2 samples containing less than 50% ZrO2, Vickers hardness and fracture toughness increased, and the elastic modulus decreased slightly with increasing ZrO2 content. Moreover, all of those values of the (U,Zr)O2 samples containing 65% ZrO2 increased slightly compared to (U,Zr)O2 samples containing 55% ZrO2. ZrO2 content affects fracture toughness significantly in the case of samples containing less than 10% ZrO2. Higher Zr content (exceeding 50%) has little effect on the mechanical properties.

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Figures

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Fig. 3

Result of SEM/EDS of samples with 65% ZrO2 content, including Y2O3/(Y2O3 + ZrO2) = 25%: (a) peripheral part and (b) central part

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Fig. 2

Backscattering image of cross section of sample with 10% ZrO2 content

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Fig. 1

Resistance-heating furnace for sintering samples

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Fig. 4

XRD patterns of samples with 10, 30, and 50% ZrO2 contents in (U,Zr)O2

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Fig. 5

XRD patterns of samples with 55 and 65% ZrO2 contents, including Y2O3/(Y2O3 + ZrO2) = 15, 20, and 25% in (U,Zr,Y)O2

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Fig. 6

Relationship between Vickers hardness and Y2O3 content for samples containing 55% and 65% ZrO2

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Fig. 7

Relationship between Vickers hardness and ZrO2 content in (U,Zr)O2

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Fig. 10

Relationship between fracture toughness and Y2O3 content samples containing 55% and 65% ZrO2

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Fig. 11

Relationship between fracture toughness and ZrO2 content in (U,Zr)O2

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Fig. 8

Relationship between elastic modulus and Y2O3 content for samples with 55% and 65% ZrO2

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Fig. 9

Relationship between elastic modulus and ZrO2 content in (U,Zr)O2

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