Tie plate with variable orifice and methods for selective control of fuel assembly coolant flow
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jun 28, 2012
app pub date -
Dec 28, 2010
filing date -
Dec 28, 2010
priority date (Note) -
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Abstract
In a nuclear reactor core, a lower tie plate assembly is provided with asymmetric features designed to control or vary a loss coefficient as a function of rotation of the associated fuel assembly. An associated method is provided to control the flow of coolant through the associated fuel assembly via rotation of the fuel assembly relative to the fuel support member. Control of the flow can be used to adjust assembly flow rate, assembly power and flow quality within the fuel assembly, among other assembly operational characteristics. Such flow control will impact the flow through other assemblies as well, since core flow remains generally fixed. On a core-wide basis, such flow control can be used to optimize core wide parameters. Optimization parameters of particular interest are the fuel cycle cost and moisture carryover.
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