Abstract
The paper describes fuel assemblies for GCFRs proposed by the GNU. One assembly uses vented pins clad in stainless steel and cooled by helium. This assembly is similar to that of an LMFRR but the clad temperature is slightly higher, the pin internal and external pressures are equalized and the clad is provided with external roughening to improve heat transfer. The other assemblies use beds of coated fuel particles directly cooled either by helium or by carbon dioxide; they allow gas temperatures similar to those of HTR or AGR but with relatively low coated particle temperatures.
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