Advanced Sample Environments for in situ Neutron Diffraction Studies of Nuclear Materials

Conference · Thu Jul 19 00:00:00 EDT 2012

OSTI ID:1047086

Reiche, Helmut M ^[1]

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1. Los Alamos National Laboratory

Summaries of this presentation are: (1) the author successfully developed and commissioned three sample environments and applied them to study scientific problems of nuclear materials; (2) sample changer - reliable, unattended operation, Reiche and Vogel, 2010; (3) creep furnace - 1000 C, 2.7 kN, texture, Reiche et al., 2012; (4) Zr-2.5Nb pressure tubes - deconvolute the contributions of heating, phase transformation, deformation at temperature in the {beta}-field, and phase transformation during cooling; (5) our data informs currently developed mechanical models predicting texture evolution during phase transformation and high temperature deformation (MST-8, LANL); (6) high-temperature furnace - >2200 C, texture, paper in progress; (7) UC - Bowman's NaCl-type structure correct for cubic UC{sub 2}, recent reactor safetly calculations by Chevalier and Fischer (2001) and independent work by Freyss (2010) incorrect, as fluorite structure is assumed; and (8) UC - order-disorder transition starting at 1800 C discovered which will improve current models, as these do not predict this transition (e.g. Basak, 2007), or confirm the prediction (Wen et al., 2012, T-1, LANL).

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE/LANL
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1047086
• Report Number(s): LA-UR-12-23203
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
42 ENGINEERING
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CREEP
DEFORMATION
FLUORITE
FORECASTING
FURNACES
HEATING
LANL
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
PRESSURE TUBES
SAMPLE CHANGERS
TEXTURE