Nuclear Engineering and Technology
- Volume 31 Issue 4
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- Pages.391-400
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- 1999
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- 1738-5733(pISSN)
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- 2234-358X(eISSN)
Conceptual Core Design of 1300MWe Reactor for Soluble Boron Free Operation Using a New Fuel Concept
- Kim, Soon-Young (Hanyang University) ;
- Kim, Jong-Kyung (Hanyang University)
- Published : 1999.08.01
Abstract
A conceptual core design of the 1,300MWe KNGR (Korean Next Generation Reactor) without using soluble boron for reactivity control was developed to determine whether it is technically feasible to implement SBF (Soluble Boron Free) operation. Based on the borated KNGR core design, the fuel assembly and control rod configuration were modified for extensive use of burnable poison rods and control rods. A new fuel rod, in which Pu-238 had been substituted for a small amount of U-238 in fuel composition, was introduced to assist the reactivity control by burnable poison rods. Since Pu-238 has a considerably large thermal neutron capture cross section, the new fuel assembly showed good reactivity suppression capability throughout the entire cycle turnup, especially at BOC (Beginning of Cycle). Moreover, relatively uniform control of power distribution was possible since the new fuel assemblies were loaded throughout the core. In this study, core excess reactivity was limited to 2.0 %