Multi-Scale Thermohydrologic Model Sensitivity-Study Calculations in Support of the SSPA
The purpose of this calculation report is to document the thermohydrologic (TH) model calculations performed for the Supplemental Science and Performance Analysis (SSPA), Volume 1, Section 5 and Volume 2 (BSC 2001d [DIRS 155950], BSC 2001e [DIRS 154659]). The calculations are documented here in accordance with AP-3.12Q REV0 ICN4 [DIRS 154418]. The Technical Working Plan (Twp) for this document is TWP-NGRM-MD-000015 Real. These TH calculations were primarily conducted using three model types: (1) the Multiscale Thermohydrologic (MSTH) model, (2) the line-averaged-heat-source, drift-scale thermohydrologic (LDTH) model, and (3) the discrete-heat-source, drift-scale thermal (DDT) model. These TH-model calculations were conducted to improve the implementation of the scientific conceptual model, quantify previously unquantified uncertainties, and evaluate how a lower-temperature operating mode (LTOM) would affect the in-drift TH environment. Simulations for the higher-temperature operating mode (HTOM), which is similar to the base case analyzed for the Total System Performance Assessment for the Site Recommendation (TSPA-SR) (CRWMS M&O 2000j [DIRS 153246]), were also conducted for comparison with the LTOM. This Calculation Report describes (1) the improvements to the MSTH model that were implemented to reduce model uncertainty and to facilitate model validation, and (2) the sensitivity analyses conducted to better understand the influence of parameter and process uncertainty. The METHOD Section (Section 2) describes the improvements to the MSTH-model methodology and submodels. The ASSUMPTIONS Section (Section 3) lists the assumptions made (e.g., boundaries, material properties) for this methodology. The USE OF SOFTWARE Section (Section 4) lists the software, routines and macros used for the MSTH model and submodels supporting the SSPA. The CALCULATION Section (Section 5) lists the data used in the model and the manner in which the MSTH model is prepared and executed. And, lastly, the RESULTS Section (Section 6) lists the two calculations conducted for the SSPA (BSC 2001d [DIRS 155950], BSC 2001e [DIRS 154659]).
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15005674
- Report Number(s):
- UCRL-ID-146835; TRN: US0305599
- Resource Relation:
- Other Information: PBD: 20 Dec 2001
- Country of Publication:
- United States
- Language:
- English
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