GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


Bibliographic Citation


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Title: Validation of hydrogeochemical codes using the New Zealand geothermal system
Creator/Author: Glassley, W.
Publication Date:1992 Dec 01
OSTI Identifier:OSTI 10132575
Report Number(s):UCRL-JC--112407; CONF-9210238--2
DOE Contract Number:W-7405-ENG-48
Document Type:Conference
Specific Type:Technical Report
Coverage:
Resource Relation:Conference: National analogue working group,Toledo (Spain),6-9 Oct 1992; Other Information: PBD: Dec 1992
Other Number(s):
Research Org:Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:USDOE, Washington, DC (United States)
Subject:15 GEOTHERMAL ENERGY; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 58 GEOSCIENCES; NEW ZEALAND; GEOTHERMAL FIELDS; GEOCHEMISTRY; V CODES; SITE CHARACTERIZATION; RADIOACTIVE WASTE DISPOSAL; HYDROLOGY; GEOLOGY; SITE SELECTION; ION EXCHANGE; CHEMICAL REACTION KINETICS; ROCK MECHANICS
Keywords:Geothermal Legacy
Description/Abstract:Evaluation of the performance of a nuclear waste repository requires that numerous parameters be evaluated over a broad range of conditions using codes. The capabilities of these codes must be demonstrated using complex natural systems in which the processes of interest have already occurred or are occurring. We have initiated such a test of geochemical and hydrological simulation codes, using the geothermal areas of the Taupo Volcanic Zone, New Zealand. Areas that have been evolving for a few tens to a few tens of thousands of years are of particular interest. This effort will help determine the extent to which simplified modeling approaches can be used in performance assessment calculations. To guide the selection of natural systems, we are attempting to map potential repository regions dominated by equilibrium processes and those dominated by kinetically controlled processes. To do so, fluid velocities and temperatures were computed using the V-TOUGH code assuming an equivalent continuum, dual porosity model. These results were then used to compare advective fluid flow rate with silica dissolution/precipitation rates, using Damkoehler numbers. Only the first 5000 years of repository operation were considered. The results identify a migrating envelope of kinetically dominated activity several meters wide in the vicinity of waste packages that contrasts with other parts of the repository. The Lake Rotokawa region, New Zealand, has been used in our first test effort, since it contains environments that are examples of kinetic and equilibrium processes. The results of tests involving equilibrium processes show excellent correspondence between simulated and observed mineral alteration sequences, although discrepancies in some mineral parageneses demonstrate that operator decisions in conducting simulations must be considered an integral part of validation efforts.
Publisher:
Country of Publication:US
Language:English
Size/Format:Medium: ED; Size: 9 p.
Rights:
Availability:OSTI; NTIS; GPO Dep.
System Entry Date:2013 Apr 15
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