What is it about?
Flows of carbon dioxide coolant around clusters of pipework, such as those found in the boilers of EDF Energy's civil nuclear reactor fleet in the UK, are poorly understood. This is due to the complicated geometry, the flow being in a turbulent regime, and the effects of intense heat and radiation over a prolonged period changing the surface texture of the boiler pipes, leading to variable heat transfer rates everywhere. This article covers simulations of an idealized geometry which bears some similarity to that used in the Advanced Gas-Cooled Reactors under representative conditions, intended to improve understanding of the flow and heat transfer rates in an ideal case, before introducing other complicating factors discussed in my doctoral thesis.
Photo by Jason Blackeye on Unsplash
Why is it important?
EDF Energy is the sole nuclear energy operator in the UK, and as their reactors are aging with few being replaced in the near future, they require information on the flow and heat transfer characteristics of the overall system to make the safety case for extending the lifespan of the existing fleet. This is both to ensure the UK's energy needs in the short-term and provide the government enough opportunity to put together its long-term Nuclear New Build strategy to improve the UK's energy security in the future. A key finding was that flow at the representative conditions has a tendency to be deflected from navigating arrays of tubes in a straight-through manner to a diagonal trajectory, which is not accounted for in EDF Energy's in-house flow diagnostics tools.
Read the Original
This page is a summary of: Modeling of In-Line Tube Banks Inside Advanced Gas-Cooled Reactor Boilers, Heat Transfer Engineering, August 2019, Taylor & Francis, DOI: 10.1080/01457632.2019.1640486.
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