FEAT Thermal Analysis of the Magnox M2 Flask

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FEAT Thermal Analysis of the Magnox M2 Flask

• P Harris and R Guy
• Frazer-Nash Consultancy

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Presentation Structure

• Problem Outline
• The M2 Flask
• Analysis Conditions
• Model Development
• Dry Transport
• Wet Transport
• De-finning the M2 Flask
• Conclusions

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Problem Outline

• The M2 Flask

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Problem Outline

• Analysis Conditions
• Normal Transport
• Regulatory Fire
• Wet Transport vs Dry Transport
• Corrosion
• Thermal Implications

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Model Components
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Fuel Stack Modelling

• Fuel Stacking
• Evaluation of Thermal Conductivities

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Simplification of Fin Modelling

• 2D Fin Model Development
• Steady State (Normal Transport)
• Transient (Regulatory Fire)
• Results of 2D Model
• Assessment of Implementation in 3D Model

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Simplification of Fin Modelling

• Results of 2D Model

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Simplification of Fin Modelling

• Implementation of Transient Cooling Phase

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Flask Lid Modelling

• Lid Seal
• Underside of Lid
• Lid Lifting Pintle
• Lid Heat Shield

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Dry Transport Model

• Thermal Mesh

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Results of Dry Transport Model

• 572W Heat Load
• Seal Temperatures
• Fuel Element Temperatures

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Wet Transport Model

• Virtual Contents Model
• Ullage Contents Model

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Results of the Wet Transport and De-finned Models

• Validation against MELTAN results
• Development of Half Model
• Heat Load Implications of De-finning

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Conclusions

• Potentially complex geometry reduced to concise
  thermal model whilst retaining fit-for-purpose
  capability
• Dry transport safety case made
• Wet transport validated against MELTAN
• Heat load implications of de-finning assessed