Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors

Table 1

Specification of MONJU core.

Items	Unit	Spec.
Reactor thermal power	MWt	714
Core configuration	—	Homogeneous 2 region core reactor
Operation cycle length	days	123
Core height	mm	930
Number of fuel assemblies (IC/OC/total)	—	108/90/198
Number of moderator assemblies	—	54
Total number of pins in the moderator assembly		61
Number of Moderator pins		9 or 24 or 61
Number of radial blanket pins		52 or 37 or 0
Pin diameter	mm	10.6
Diameter of moderator	mm	9.5
Moderator material		Zr deuteride; Zr hydride