Development of scaling laws of heat removal and CFD assessment in concrete cask air path

Kim, Hyeun Min; No, Hee Cheon; Bang, Kyoung-Sik; Seo, Kyoungwoo; Lee, Sang Hoon

doi:10.1016/j.nucengdes.2014.06.015

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…The ambient temperature for the winter conditions is taken to be 283 K (10˚C) and the heat transfer coefficient was calculated accordingly for the air on the radial and top surface of cask, which were found to be 4.26 W/m 2 and 5 W/m 2 , respectively. The emissivity, which is around 0.6 -0.8 in the dry storage system (Brewster et al, 2012;Kim et al, 2014) are the same values used in the previous case for summer conditions. It can be seen from Table 4-9 that in summer less amount of heat is removed by the air as the change in the temperature of the air is lesser in summer when compared to winter.…”

Section: Full-scale Model With Thermal Radiation and Transmissivity =mentioning

confidence: 88%

“…To determine the appropriate heat flux used in reduced model, Kim et al (2014) performed scaling analysis for natural convection in concrete cask air path. In the analysis, the quantity θ represents physical variables.…”

Section: Reduced Model (Scaling Factor = 283) With the Heat Flux Basmentioning

confidence: 99%

“…In thermal radiation simulation, the key parameter is the emissivity and the value is around 0.6 -0.8 in the dry storage system simulation (Brewster et al, 2012;Kim et al, 2014). The Kirchhoff's Law requires that for each boundary or interface, the sum of emissivity (α), reflectivity (ρ), and transmissivity (τ) equals unity.…”

Section: Effects Of Transmissivity On Temperature Fieldsmentioning

confidence: 99%

“…Due to high temperatures, radiation mode of heat transfer is also considered in this simulation to obtain a more accurate temperature distribution. The key parameter in thermal radiation simulation is the emissivity, and its value is around 0.6 -0.8 for the dry storage system (Brewster et al, 2012;Kim et al, 2014). It can be seen from Table 4-8 that accounting for radiation as a mode of heat transfer considerably reduces the average canister wall temperature, but increases the outer wall temperature by a small amount.…”

Section: Full-scale Model With Thermal Radiation and Transmissivity (mentioning

confidence: 99%

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Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Bencturk¹,

Padgett²,

Uddin³

2017

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This study is focused on vertical concrete dry casks and their structural performance in seismic and tip-over events, aiming for risk estimation of large seismically induced motions (large sliding and tip-over) and structural damage due to the tip-over loads. Both numerical and experimental work was conducted to investigate the long-term performance of the concrete outerpacks with an exposed surface. Material level studies provided additional data to the existing literature on how to accelerate the corrosion and alkali-silica reactivity (ASR) in concrete without altering the key properties of the material to observe significant levels of deterioration in a short period of time. The developed methods are specifically geared towards large-scale applications of structural systems. Detailed thermal analysis was performed to determine the temperature distributions in both prototype and scaled casks. Tip-over experiments were performed on both intact and aged physical models of concrete casks to compare the structural performance in terms under combined aging and mechanical loading. The influence of shrinkage, creep and gravity loading in the long-term and combined ASR and tip-over impact were investigated using detailed numerical simulations. In the probabilistic assessments, the effect of different sources of aleatory and epistemic uncertainties on the structural performance of the dry casks are studied, and probabilistic models are developed for some of the key structural responses. Fragility curves are developed for seismic sliding motion and tip-over, as well as large acceleration in case of tip-over, and effect of different parameters' variations on the response is studied herein. Probabilistic seismic analysis on a portfolio of vertical concrete dry casks is performed in this study considering common cask configurations in the United States. Probabilistic seismic demand models for the maximum sliding distance and maximum angle of rotation of the casks are developed, and seismic fragility analysis and parameter study are performed. Seismic risk of large sliding motions and tip-over is estimated. In addition, finite element models are developed to analyze the structural response of a dry cask to impact tip-over loads considering the influence of material and structural parameter variations. Impact fragility curves are developed for the mean maximum acceleration of the cask in tip-over events, and effect of geometric and material properties on the response is investigated. 2 2 Volume V 3 3 Mass M 3 3 2.5. REFERENCES

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Section: Full-scale Model With Thermal Radiation and Transmissivity =mentioning

confidence: 88%

Section: Reduced Model (Scaling Factor = 283) With the Heat Flux Basmentioning

confidence: 99%

Section: Effects Of Transmissivity On Temperature Fieldsmentioning

confidence: 99%

Section: Full-scale Model With Thermal Radiation and Transmissivity (mentioning

confidence: 99%

See 2 more Smart Citations

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Bencturk¹,

Padgett²,

Uddin³

2017

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“…Li and Liu [4] studied the thermal performance of a vertical dry storage cask with a welded canister containing high-burnup fuel. Kim et al [5] investigated heat transfer in a concrete cask like the one used at the intermediate storage facilities for BWR spent fuel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Thermal Performance of a Dry Storage Cask for Spent Nuclear Fuel

2018

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Abstract:In this study, the heat flow characteristics and thermal performance of a dry storage cask were investigated via thermal flow experiments and a computational fluid dynamics (CFD) simulation. The results indicate that there are many inner circulations in the flow channel of the cask (the channel width is 10 cm). These circulations affect the channel airflow efficiency, which in turn affects the heat dissipation of the dry storage cask. The daily operating temperatures at the top concrete lid and the upper locations of the concrete cask are higher than those permitted by the design specification. The installation of the salt particle collection device has a limited negative effect on the thermal dissipation performance of the dry storage cask.

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Similarity analysis of thermal-fluid flow for thermal testing using scaled-down model of spent fuel storage cask

Lee

Bang

et al. 2020

Annals of Nuclear Energy

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Development of scaling laws of heat removal and CFD assessment in concrete cask air path

Cited by 12 publications

References 11 publications

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Probabilistic Multi-Hazard Assessment of Dry Cask Structures

Numerical Simulation of the Thermal Performance of a Dry Storage Cask for Spent Nuclear Fuel

Similarity analysis of thermal-fluid flow for thermal testing using scaled-down model of spent fuel storage cask

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