Core & Reload Optimisation

The optimal use of fuel assemblies can generate substantial savings for nuclear power plants. NRG developed two useful tools that are dedicated to this challenge.

ROSA: efficient in-core fuel management (reload optimisation)
 By applying NRG’s software tool ROSA, savings of 1 percent of the fuel cost, or millions of euros can be achieved. With ROSA, you determine the optimal loading pattern for a reactor, but ROSA also offers other advantages, such as improved safety margins, easily and quickly perform scoping studies and reduction of the necessary engineering time.

ROSA calculates the power distribution of the core in 3D and any combination of more than sixty optimisation parameters can be chosen to design the loading pattern. The more complex the problem, the better ROSA comes into its own. ROSA is very user friendly and has an intuitive user interface. A tool by and for reactor engineers.

SOSA: efficient in-core fuel management (shuffle optimisation)
Like ROSA, SOSA is a special software tool developed by NRG. This tool focuses on shortening the reload time of the reactor core. By minimising the movements of the refuelling machine, the reload time can be shortened by as much as 6-8 hours. Moreover an optimal refuelling plan helps lower the radiation dose to the staff. SOSA facilitates the design of the shuffle plan through its interactive and intuitive graphical user interface. Here the user can choose from a palette of options and parameters to take any practical situation into account in the design.

ROSA Publications

M. van der Schaar, F.C.M. Verhagen, W.J.M. de Kruijf and T.F.H. van de Wetering,
"ROSA: A Code for Fuel Management",
Jahrestagung Kerntechnik (1996).

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F.C.M. Verhagen, M. van der Schaar, W.J.M. de Kruijf, T.F.H. van de Wetering and R.D. Jones,
"ROSA, A Utility Tool for Loading Pattern Optimization",
Proc. of the Topical Meeting Advances in Nuclear Fuel Management II, Myrtle Beach, V1, 8-31 (1997).

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J. Strange, J. Lemons, G. Bair,
"Core Redesign Using ROSA",
 Entry for the 2001 Annual NEI Top Industry Practice Award (2001).

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F.C.M. Verhagen, P.H. Wakker, and J.T. van Bloois,
"Minimizing PWR Reloading Time by Optimizing Core Design and Reshuffling Sequence",
 Presented at TopFuel 2003, Würzburg, Germany, 16-19 March (2003).

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R.D. Jones,
"SNC's Use of ROSA to Find More Economical Loading Patterns",
 Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management III, Hilton Head Island, S.C. (2003).

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P.H. Wakker, F.C.M. Verhagen, J.T. van Bloois, and W.R. Sutton, III,
"Reducing Refueling Outage Duration by Optimizing Core Design and Shuffling Sequence",
 Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management III, Hilton Head Island, S.C. (2003).

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Scott T. Krepel and John E. Strange,
“TVA Core Design Using ROSA”,
Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management III, Hilton Head Island, S.C. (2003).

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F.C.M. Verhagen, P.H. Wakker,
"ROSA, a Flexible Loading Pattern Optimization Tool for PWRs",
Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management III, Hilton Head Island, S.C. (2003).

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P.H. Wakker, F.C.M. Verhagen, J.T. van Bloois, and W.R. Sutton, III,
 "Reducing Duration of Refueling Outage by Optimizing Core Design and Shuffling Sequence",
 Nuclear Technology, Vol. 151, July 2005.

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F.C.M. Verhagen, P.H. Wakker,
"Economic Optimization of PWR Cores with ROSA",
 Proc. of the 2005 Water Reactor Fuel Performance Meeting, Kyoto, Japan (2005).

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Brian J. Kern,
“Mitigation of CIPS Risk through Core Design Optimization”,
Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management IV, Hilton Head Island, S.C. (2009).

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F.C.M. Verhagen, P.H. Wakker,
“Highly Constrained Loading Pattern Searches with ROSA”,
Proc. of the ANS Topical Meeting Advances in Nuclear Fuel Management IV, Hilton Head Island, S.C. (2009).

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H.P.M. Gibcus, F.C.M. Verhagen, and J.T. van Bloois,
“Multicycle Loading Pattern Searches for End-Of-Life Scenarios with ROSA”,
Proc. of the 2011 Water Reactor Fuel Performance Meeting, Chengdu, China (2011).

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H.P.M. Gibcus, F.C.M. Verhagen, and P.H. Wakker,
“ROSA Full-Core and DNBR Capabilities”,
Proc. of the Jahrestagung Kerntechnik 2012, Stuttgart, Germany (2012).