Mechanical compaction of Waste Isolation Pilot Plant simulated waste

Butcher, B.M.; Thompson, T.W.; VanBuskirk, R.G.; Patti, N.C.

doi:10.2172/5114681

Cited by 9 publications

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“…Efforts to determine the mechanical response of waste packages were first coordinated by Huerta et al (1983) (Butcher et al, 1990) using updated waste mixes in full-scale drum tests. Copies of this and related documents were held by WIPP staff responsible for the project.…”

Section: Background and Objectives Of Experimentsmentioning

confidence: 99%

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One-Quarter-Scale Laboratory Crush Tests on Unconfined Waste Cans and a Confined Waste Package in Support of the Waste Isolation Pilot Plant (WIPP)

Wawersik¹

2001

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In 1989 '/s-scale model tests were conducted under quasi-static loading to explore the potential of . laboratory experiments for evaluating computer simulations of the response of waste packages and crushed-salt backfill in the Waste Isolation Pilot Plant (WIPP). The choice of crushed salt was based on engineering considerations in the late 1980s that are superceded by the current design of the WIPP. One-quarter-scaling was applied to the dimensions of individual waste drums as well as to the distances between the walls of WIPP excavations and the outermost rows and columns of full-scale waste packages.Experiments were performed on single cans and on one confined seven-pack of simulated waste canisters consisting of No. 12 food cans filled with simulated combustible waste. These tests had three specific objectives: (1) Comparison of the load-supporting capabilities and deformation modes of single simulated waste cans with the response of multiple waste packages that were surrounded and confined by dry crushed salt. In this case, multiple waste packages were replaced by one seven-pack of cans that could be accommodated in a laboratory experiment of manageable size. (2) Development of a small-scale experiment that would yield independent measurements to evaluate the predictive capabilities of computer simulations. (3) Generation of experimental measurements for comparison with the results of numerical analyses whose outcome is determined by the combination of geometric and structural system idealizations, boundary conditions, constitutive models, and computer algorithms.Overall, the study confirms that laboratory tests involving a pack of seven cans filled with simulated waste surrounded and confined by crushed-salt backfill (or some other kind of backfill) constitute a viable approach to code validation. Acknowledgement

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Section: Background and Objectives Of Experimentsmentioning

confidence: 99%

“…05-7501 (Butcher et al, 1990). This work was awarded to Science Application International Corporation (SAX) in parallel with the experiments that are the subject of this report.…”

Section: Background and Objectives Of Experimentsmentioning

confidence: 99%

One-Quarter-Scale Laboratory Crush Tests on Unconfined Waste Cans and a Confined Waste Package in Support of the Waste Isolation Pilot Plant (WIPP)

Wawersik¹

2001

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“…Extensive in-situ.and laboratory testing has been performed to determine the constitutive models and parameter values for creep deformation in halite (Krieg, 1984;Munson et al, 1989) and for consolidation of waste and backfill (Sjaardema and Krieg, 1987;Butcher, 1989;Butcher et al, 1991a;Butcher et al, 1991b). These models and parameters were used to perform simulations of room closure using a finite element creep closure code, SANCHO (Stone et al, 1985).…”

Section: Geomechanics Overviewmentioning

confidence: 99%

“…Miriimums, best estimates, and maximums for the hydrologic parameters are summarized in Table 3-1 for the disposal room, in Table 3-2 for the halite, and in Table 3-3 for the anhydrite interbeds. for fully consolidated sludge-filled waste containers (Butcher et al, 1991b) to 1 x 10" 11 m 2 for initially emplaced crushed salt backfill . Because the simulations were not sensitive to the room permeability over this range, 1 x 10" The initial room porosity was 0.66, based on a volume average of the porosities of the room contents .…”

Section: Hydrologic Parametersmentioning

confidence: 99%

“…Backfill consolidates more rapidly and 1-17 with little resistance. Even with high gas-generation rates as under brine-inundated conditions, room closure and consolidation is expected to cause a significant reduction in the void volume available to store waste-generated gas within a disposal room.Extensive in-situ.and laboratory testing has been performed to determine the constitutive models and parameter values for creep deformation in halite (Krieg, 1984;Munson et al, 1989) and for consolidation of waste and backfill (Sjaardema and Krieg, 1987;Butcher, 1989;Butcher et al, 1991a;Butcher et al, 1991b). These models and parameters were used to perform simulations of room closure using a finite element creep closure code, SANCHO (Stone et al, 1985).…”

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Coupled multiphase flow and closure analysis of repository response to waste-generated gas at the Waste Isolation Pilot Plant (WIPP)

Freeze¹,

Larson²,

Davies³

1995

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A long-term assessment of the Waste Isolation Pilot Plant (WIPP) repository performance must consider the impact of gas generation resulting from the corrosion and microbial degradation of the emplaced waste. A multiphase fluid flow code, TOUGH2/EOS8, was adapted to model the processes of gas generation, disposal room creep closure, and multiphase (brine and gas) fluid flow, as well as the coupling between the three processes. System response to gas generation was simulated with a single, isolated disposal room surrounded by homogeneous halite containing two anhydrite interbeds, one above and one below the room. The interbeds were assumed to have flow connections to the room through high-permeability, excavation-induced fractures.System behavior was evaluated by tracking four performance measures: (1) peak room pressure; (2) maximum brine volume in the room; (3) total mass of gas expelled from the room; and (4) the maximum gas migration distance in an interbed. A deterministic approach, including baseline and sensitivity simulations, was used. Baseline simulations used current best estimates of system parameters, selected through an evaluation of available data, to predict system response to gas generation under best-estimate conditions. Sensitivity simulations quantified the effects of parameter uncertainty by evaluating the change in the performance measures in response to parameter variations. In the sensitivity simulations, a single parameter value was varied to its minimum and maximum values, representative of the extreme expected values, with all other parameters held at best-estimate values.Simulation results indicated that (1) in the absence of interbed fracturing, disposal room pressures will exceed, lithostatic, even at gas-generation rates representative of vapor-limited conditions, (2) under best-estimate conditions, brine availability was insufficient to fully exhaust the brine-dependent gas-generation potential, (3) the mass of gas expelled from the room and the gas migration distance are much more sensitive to the total mass of gas generated than to the gas-generation rate, and (4) the halite properties are important to gas migration because gas movement in the interbeds is limited by the displacement of interbed brine into the surrounding halite.Sensitivity simulations identified the following parameters as important to gas expulsion and migration away from a disposal room: interbed porosity; interbed permeability; gas-generation potential; halite permeability; and interbed threshold pressure. The uncertainty in multiphase flow parameters was not adequately characterized because of the lack of WIPP-specific data. Simulations also showed that the inclusion of interbed fracturing and a disturbed rock zone had a significant impact on system performance.The TOUGH2/EOS8 deterministic simulation and sensitivity results were similar to stochastic results obtained by WIPP Performance Assessment from a repository-scale model. Because the deterministic approach allows conceptual models to be quanti...

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Room Closure Response to Gas Generation and Mechanical Strength of Different Waste Forms in a Bedded Salt Repository

Mendenhall

Stone

1993

MRS Proc.

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Finite element calculations of the porosity history of a nuclear waste disposal room for transuranic (TRU) waste in a bedded salt formation have been completed. The analyses include a reduced elastic/secondary creep model for the host halite and a nonlinear consolidation model for the crushed salt backfill. Separate gas generation and constitutive models were used for three distinct hypothetical waste forms: 1) unaltered defense-related, contact-handled transuranic (CH-TRU) waste, 2) shredded and cemented CH-TRU waste, and 3) incinerated and vitrified CH-TRU waste. Histories were determined for a 2000 year time period starting from the emplacement of room seals. The resulting final room porosities varied from roughly 55% to less than 10%, according to waste forms.

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Mechanical compaction of Waste Isolation Pilot Plant simulated waste

Abstract: An exampleof the applicationof the power law relationshipfor sampleconsolidationwith time, Equation2.3.3.1, to data representingthe changein densitywith time of a mixtureof PVC, polyethyleneparts,and surgicalglovesundera constantaxial stress of 13.

Cited by 9 publications

References 0 publications

One-Quarter-Scale Laboratory Crush Tests on Unconfined Waste Cans and a Confined Waste Package in Support of the Waste Isolation Pilot Plant (WIPP)

One-Quarter-Scale Laboratory Crush Tests on Unconfined Waste Cans and a Confined Waste Package in Support of the Waste Isolation Pilot Plant (WIPP)

Coupled multiphase flow and closure analysis of repository response to waste-generated gas at the Waste Isolation Pilot Plant (WIPP)

Room Closure Response to Gas Generation and Mechanical Strength of Different Waste Forms in a Bedded Salt Repository

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