A Critical Review of the Recent Improvements in Minimizing Nuclear Waste by Innovative Gas-Cooled Reactors

Table 2

(a) Delayed neutron fraction (𝑣_𝐷 is the number of delayed neutrons per fission, 𝑣_total is the total number of neutrons per fission) [13].

Isotope	𝑣𝐷/𝑣total
U^238	0.0151
Th^232	0.0209
U^235	0.00673
Pu^239	0.00187
Pu^241	0.00462
Pu^242	0.00573
Np^237	0.00334
Am^241	0.00114
Am^243	0.00198
Cm^242	0.00033

(b) Example of delayed neutrons fraction [13].

Example
⇒10% fertile fission raises 𝛽 in fertile containing
fast reactor fuel to:
𝛽(U^235)		𝛽(Pu^239)
0.10⋅0.0151	+	0.90⋅0.00187
= 0.00151	+	0.00168
	= 0.00319
(Nearly double 𝛽 vis-à-vis fertile-free fuel