NRC model simulations in support of the hydrologic code intercomparison study (HYDROCOIN): Level 1-code verification

Technical Report · Tue Mar 01 00:00:00 EST 1988

OSTI ID:5267773

HYDROCOIN is an international study for examining ground-water flow modeling strategies and their influence on safety assessments of geologic repositories for nuclear waste. This report summarizes only the combined NRC project temas' simulation efforts on the computer code bench-marking problems. The codes used to simulate thesee seven problems were SWIFT II, FEMWATER, UNSAT2M USGS-3D, AND TOUGH. In general, linear problems involving scalars such as hydraulic head were accurately simulated by both finite-difference and finite-element solution algorithms. Both types of codes produced accurate results even for complex geometrics such as intersecting fractures. Difficulties were encountered in solving problems that invovled nonlinear effects such as density-driven flow and unsaturated flow. In order to fully evaluate the accuracy of these codes, post-processing of results using paricle tracking algorithms and calculating fluxes were examined. This proved very valuable by uncovering disagreements among code results even through the hydraulic-head solutions had been in agreement. 9 refs., 111 figs., 6 tabs.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Engineering
• OSTI ID: 5267773
• Report Number(s): NUREG-1249-Vol.1; ON: TI88900619
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
F CODES
FLOW MODELS
S CODES
T CODES
U CODES
BENCHMARKS
COMPUTERIZED SIMULATION
FINITE DIFFERENCE METHOD
FINITE ELEMENT METHOD
GROUND WATER
HYDROLOGY
INTERNATIONAL COOPERATION
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
US NRC
COMPUTER CODES
COOPERATION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
ITERATIVE METHODS
MANAGEMENT
MASS TRANSFER
MATHEMATICAL MODELS
NATIONAL ORGANIZATIONS
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
SIMULATION
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
052002* - Nuclear Fuels- Waste Disposal & Storage
510300 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- (-1989)
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)