A Design and Optimization Methodology for Liquid Metal Fast Reactors

Table 7

Comparison of original, seed, and optimized WLFR.

Parameter	Original design	Seed design	Optimized design
Assembly pitch (cm)	16.3	16.25	16.158
Pitch-to-diameter ratio	1.143	1.1296	1.1219
Number of fuel pins per assembly	61	61	61
Fuel pellet radius (cm)	0.7524	0.7594	0.7613
Fuel pin radius (cm)	0.8485	0.8564	0.8584
Fuel pin pitch (cm)	1.8925	1.8889	1.8795
Active fuel height (cm)	220	220	215.7
Inner core enrichment (%)	10.300	10.084	10.088
Middle core enrichment (%)	11.800	11.264	11.322
Outer core enrichment (%)	13.800	14.552	14.898
Cycle length (EFPYs)	25	27.6	30.28
LFCC (MWe.Hr)	6.98	6.79	6.69
BOC ^235U masses (kg)
IC	2232	2227	2195
MC	2331	2267	2245
OC	5224	5612	5662
Core total	9787	10105	10102
BOC ^238U masses (kg)
IC	19441	19854	19563
MC	17422	17857	17585
OC	32634	32956	32344
Core total	69496	70667	69493
BOC total core HM masses (kg)
IC	21673	22080	21758
MC	19752	20123	19830
OC	37858	38569	38006
Core total	79284	80772	79595