Comparison of HYDRA predictions to temperature data from two single-assembly spent fuel heat transfer tests

McCann, R.A.

doi:10.2172/7012944

Cited by 1 publication

(1 citation statement)

References 3 publications

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“…Two computer codes, COBRA-SFS [Rector, 1986b] and HYDRA-II [McCann, 1987a], have been used extensively to perform thermal-hydraulic analyses of dry storage spent fuel systems. Both codes are recognized as state-of-the-art codes capable of providing a best estimate of fuel temperature in dry storage systems.…”

Section: The Cobra-sfs and Hydra-ii Codesmentioning

confidence: 99%

Modeling status and needs for temperature calculations within spent fuel disposal containers

Sullivan¹,

Pescatore²

1989

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EXECUTIVE SUMMARYMany processes relevant to long term performance of a spent fuel waste package are sensitive to the temperature within the container and of its sheU, e.g., cladding degradation, the release of 14 C from spent fuel, UO 2 oxidation, evaporation of moisture 'jvithin the container, the likely location where wetting will occur, etc. With most processes overprediction of the temperature causes a conservative prediction of the performance. For some processes, however, this is not true. For example, overprediction in temperature leads to an overprediction of the time at which water can exist in liquid form in a waste container. For these reasons, reliable waste package temperature calculations are an important concern from a performance assessment and a licensing point of view.Waste package temperatures depend on both internal factors, such as internal geometry, material properties, and heat loading, and on external factors, such as host rock properties and area! heat loading of the entire repository.The primary objective of this report is to present the findings of a literature review of work pertinent to predicting intact waste package internal temperatures under spent fuel isolation conditions. Therefore, it is assumed that a repository scale thermal analysis has been conducted and that the exterior temperature of the waste package is known. The problem then reduces to one determined by the waste package and its properties.Secondary objectives of this report are to identify key parameters and methodologies for performing the thermal analysis within intact waste containers, and identify sources of uncertainty in these calculations.Based on information supplied in the latest version of the Yucca Mountain Site Characterization Plan (SCP), three basic categories of spent fuel arrangements within the disposal containers are envisioned: a) spent fuel consolidated at the repository; b) spent fuel consolidated away from the repository in a 2:1 ratio; and c) unconsolidated spent fuel assemblies. There exist conceptual designs for each of these categories. The leading design contemplates the disposal of fuel consolidated at the repository site with argon as the backfill gas.With reference to Figure ES-1, the container for spent fuel consolidated at the repository implements an internal structure with six compartments. Within each compartment, the fuel rods occupy approximately 50% of the volume available. The rods are free to move within each compartment during handling and emplacement operations. Thus, it is unlikely that the precise geometry will be known after emplacement. For horizontal emplacement, the rods will distribute themselves under the force of gravity and it is likely that there will be large gaps around the container. For vertical emplacement (the reference emplacement strategy), the final location and shape of the gas gaps is not well defined.For preconsolidated or intact spent fuel assemblies the rods are not free to move. Thus, the internal geometry in the container is more accurately known.T...

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Section: The Cobra-sfs and Hydra-ii Codesmentioning

confidence: 99%

Modeling status and needs for temperature calculations within spent fuel disposal containers

Sullivan¹,

Pescatore²

1989

View full text Add to dashboard Cite

show abstract

Comparison of HYDRA predictions to temperature data from two single-assembly spent fuel heat transfer tests

Cited by 1 publication

References 3 publications

Modeling status and needs for temperature calculations within spent fuel disposal containers

Modeling status and needs for temperature calculations within spent fuel disposal containers

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