Limitations to the use of two-dimensional thermal modeling of a nuclear waste repository
Thermal modeling of a nuclear waste repository is basic to most waste management predictive models. It is important that the modeling techniques accurately determine the time-dependent temperature distribution of the waste emplacement media. Recent modeling studies show that the time-dependent temperature distribution can be accurately modeled in the far-field using a 2-dimensional (2-D) planar numerical model; however, the near-field cannot be modeled accurately enough by either 2-D axisymmetric or 2-D planar numerical models for repositories in salt. The accuracy limits of 2-D modeling were defined by comparing results from 3-dimensional (3-D) TRUMP modeling with results from both 2-D axisymmetric and 2-D planar. Both TRUMP and ADINAT were employed as modeling tools. Two-dimensional results from the finite element code, ADINAT were compared with 2-D results from the finite difference code, TRUMP; they showed almost perfect correspondence in the far-field. This result adds substantially to confidence in future use of ADINAT and its companion stress code ADINA for thermal stress analysis. ADINAT was found to be somewhat sensitive to time step and mesh aspect ratio. 13 figures, 4 tables.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6274837
- Report Number(s):
- UCID-18101; TRN: 79-011248
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOACTIVE WASTE FACILITIES
MATHEMATICAL MODELS
A CODES
COMPUTER CODES
GLASS
RADIOACTIVE WASTE STORAGE
SALT DEPOSITS
T CODES
TEMPERATURE DISTRIBUTION
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS
UNDERGROUND STORAGE
GEOLOGIC DEPOSITS
MANAGEMENT
NUCLEAR FACILITIES
STORAGE
WASTE MANAGEMENT
WASTE STORAGE
052002* - Nuclear Fuels- Waste Disposal & Storage