Closed Fuel Cycle and Minor Actinide Multirecycling in a Gas-Cooled Fast Reactor

Table 1

Reactivity weights 𝐰_𝐢 for several isotopes in several types of reactors, normalized to 𝐰_𝐢 for Pu-239. Data sources: PWR based on EPR standard UOx fuel from [6], LMFBR based on a generic oxide fuel, sodium coolant [7], and GCFR based on GFR600 (described later in this paper).

Isotope	LWR UOx	LMFBR	GCFR
U-235	0.392	0.759	0.785
U-238	−0.007	−0.049	−0.067
Np-237	−0.507	−0.111	−0.159
Pu-238	−0.360	0.662	0.660
Pu-239	1.000	1.000	1.000
Pu-240	−3.847	0.134	0.120
Pu-241	1.485	1.418	1.484
Pu-242	−0.462	0.081	0.064
Am-241	−1.755	−0.452	−0.218
Am-243	−0.802	−0.153	−0.192
Cm-242	−0.028	0.429	0.418
Cm-243	1.787	2.374	2.481
Cm-244	−0.192	0.219	0.214
Cm-245	3.032	2.013	2.125
Cm-246	−0.020	0.150	0.145