scholarly journals The Probabilistic Nature of Environmental Cracking in Candidate Waste Package Materials

2001 ◽  
Author(s):  
G.M. Gordon ◽  
P.L. Andresen ◽  
L.M. Young
Keyword(s):  
Waste Package ◽  
Probabilistic Nature ◽  
Package Materials

The Expected Environment for Waste Packages in a Salt Repository

1983 ◽  
Vol 26 ◽  
Author(s):  
L. R. Pederson ◽  
D. E. Clark ◽  
F. N. Hodges ◽  
G. L. Mcvpy ◽  
D. Rai
Keyword(s):  
Rock Salt ◽  
Near Field ◽  
Materials Testing ◽  
Site Specific ◽  
Waste Package ◽  
Barrier Materials ◽  
Waste Forms ◽  
Temperature Irradiation ◽  
Salt Brine ◽  
Package Materials

ABSTRACTThis paper discusses results of recent efforts to define the very near-field (within approximately 2m) environmental conditions to which waste packages will be exposed in a salt repository. These conditions must be considered in the experimental design for waste package materials testing, which includes corrosion of barrier materials and leaching of waste forms. Site-specific brine compositions have been determined, and “standard” brine compositions have been selected for testing purposes. Actual brine compositions will vary depending on origin, temperature, irradiation history, and contact with irradiated rock salt. Results of irradiating rock salt, synthetic brines, rock salt/brine mixtures, and reactions of irradiated rock salt with brine solutions are reported.

scholarly journals Evaluation of the Final Report: Waste Package Materials Performance Peer Review Panel

2002 ◽  
Author(s):  
J.N. Bailey ◽  
J.D. Cloud ◽  
T.E. Rodgers ◽  
S.E. Summers
Keyword(s):  
Peer Review ◽  
Final Report ◽  
Review Panel ◽  
Waste Package ◽  
Package Materials

scholarly journals Results from Simulated Remote-Handled Transuranic Waste Experiments at the Waste Isolation Pilot Plant (WIPP)

1992 ◽  
Vol 294 ◽  
Author(s):  
Martin A. Molecke
Keyword(s):  
Rock Salt ◽  
Pilot Plant ◽  
Near Field ◽  
Laboratory Data ◽  
Silica Sand ◽  
Waste Isolation Pilot Plant ◽  
Waste Package ◽  
Test Operation ◽  
Transuranic Waste ◽  
Package Materials

ABSTRACTMulti-year, simulated remote-handled transuranic waste (RH TRU, nonradioactive) experiments are being conducted underground in the Waste Isolation Pilot Plant (WIPP) facility. These experiments involve the near-reference (thermal and geometrical) testing of eight full-size RH TRU test containers emplaced into horizontal, unlined rock salt boreholes. Half of the test emplacements are partially filled with bentonite/silica-sand backfill material. All test containers were electrically heated at about 115 W/each for three years, then raised to about 300 W/each for the remaining time. Each test borehole was instrumented with a selection of remote-reading thermocouples, pressure gages, borehole vertical-closure gages, and vertical and horizontal borehole-diameter closure gages. Each test emplacements was also periodically opened for visual inspections of brine intrusions and any interactions with waste package materials, materials sampling, manual closure measurements, and observations of borehole changes. Effects of heat on borehole closure rates and near-field materials (metals, backfill, rock salt, and intruding brine) interactions were closely monitored as a function of time. This paper summarizes results for the first five years of in situ test operation with supporting instrumentation and laboratory data and interpretations. Some details of RH TRU waste package materials, designs, and assorted underground test observations are also discussed. Based on the results, the tested RH TRU waste packages, materials, and emplacement geometry in unlined salt boreholes appear to be quite adequate for initial WIPP repository-phase operations.

Development and Evaluation of a Tracer-Injection Hydrothermal Technique for Studies of Waste Package Interactions

1986 ◽  
Vol 84 ◽  
Author(s):  
Thomas E. Jones ◽  
D.G. Coles ◽  
R.C. Britton ◽  
J.R. Burnell
Keyword(s):  
Hydrothermal Fluid ◽  
Injection System ◽  
Hydrothermal Conditions ◽  
Tracer Injection ◽  
Waste Package ◽  
Hydrothermal Experiments ◽  
Simulated Waste ◽  
Simulated Groundwater ◽  
Liquid Chromatographic ◽  
Package Materials

AbstractA tracer-injection system has been developed for use in characterizing reactions of waste package materials under hydrothermal conditions. High-pressure liquid chromatographic instrumentation has been coupled with Dickson-type rocking autoclaves to allow injection of selected components into the hydrothermal fluid while maintaining run temperature and pressure. Hydrothermal experiments conducted using this system included the interactions of depleted uranium oxide and Zircaloy-4 metal alloy discs with trace levels of 99Tc and non-radioactive Cs and I in a simulated groundwater matrix. After waste-package components and simulated waste forms were pre-conditioned in the autoclave systems (usually 4 to 6 weeks), known quantities of tracer-doped fluids were injected into the autoclaves' gold reaction bag at run conditions. Time-sequenced sampling of the hydrothermal fluid provided kinetic data on the reactions of tracers with waste package materials. The injection system facilitates the design of experiments that will better define “steady-state” fluid compositions in hydrothermal reactions. The injection system will also allow for the formation of tracer-bearing solid phases in detectable quantities.

The Waste Package Materials Field Test in S.E. New Mexico Salt

1983 ◽  
Vol 26 ◽  
Author(s):  
Martin A. Molecke ◽  
Teresa M. Torres
Keyword(s):  
New Mexico ◽  
Field Test ◽  
High Density ◽  
Silica Sand ◽  
High Level Waste ◽  
Low Density ◽  
Waste Package ◽  
Backfill Materials ◽  
Package Materials

ABSTRACTA six-part, waste package materials field test was conducted in a halite horizon of a potash mine in southeastern New Mexico. The primary purposes of this test were to evaluate the thermophysical and geochemical performance of candidate HLW-package backfill materials emplaced in rock salt and the corrosion behavior of candidate waste canister or overpack alloys. This field test series also served as a precursor to forthcoming Waste Isolation Pilot Plant (WIPP) in situ waste package performance experiments on simulated defense high-level waste packages, serving to develop applicable testing, instrumentation, and sampling techniques. The backfill materials tested (individually, in one- to five-month tests) were: low-density bentonite clay; low-density bentonite (70 wt.%)-silica sand (30 wt.%) mixtures, both dry and brine-injected; high-density bentonite-sand annular compacts; trapped air; and finely-crushed WIPP salt. The in situ measured thermal conductivities (at a maximum canister-heater surface temperature of 150° or 250°C) for the backfills ranged from 0.25 W/mK for pure bentonite to about 1.25 W/mK for the high-density bentonite-sand. No significant backfill material degradation products were detected in post-test analyses. No appreciable corrosion of the titanium-, nickel-, or iron-based alloys embedded in the hot backfill was found; potentially significant pitting corrosion of 2 1/4 Cr-1 Mo steel and copper was detected.

The Influence of Environmental Conditions and Passive Film Properties on the MIC of Engineered Barriers in the Yucca Mountain Repository

2004 ◽  
Vol 824 ◽  
Author(s):  
A.C. Lloyd ◽  
R.J. Schuler ◽  
J.J. Noël ◽  
D.W. Shoesmith ◽  
F. King
Keyword(s):  
Microbial Activity ◽  
Yucca Mountain ◽  
Film Properties ◽  
Waste Package ◽  
Barrier Materials ◽  
Radiation Fields ◽  
Microbially Induced Corrosion ◽  
Alloy 22 ◽  
Engineered Barriers ◽  
Package Materials

AbstractA combination of gamma radiation fields, the absence of moisture, and the high temperatures on the drip shield (DS) and waste package (WP) should combine to suspend microbial activity on the DS/WP surfaces for many tens of thousands of years. This lack of microbial activity, coupled with the corrosion resistance of the titanium Grade7 (Ti-7 drip shield) and the Alloy-22 (waste package) materials make microbially induced corrosion (MIC) of these engineered barrier materials extremely unlikely.

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