Compilation of Existing Neutron Screen Technology

Table 6

HFIR irradiation parameters for proposed tripin concept [23].

Parameter	Value
Fast (>0.1 MeV) neutron flux in irradiation volume	1.2 · 10^15 n/cm^2·sec
(a) Annual^3 fast (>0.1 MeV) neutron fluence at peak irradiation position	1.6 · 10^22 n/cm^2
(b) Burnup/year	5.9%
(c) dpa	19.5
Fuel burnup-to-clad dpa ratio at peak irradiation position	0.3 atoms % per dpa
Fast (>0.1 MeV) to thermal (here <0.625 eV) flux ratio	400
He-to-dpa ratio in iron at peak irradiation position	0.2 appm He per dpa
Linear heat rate (variable, depending upon design of Eu2O3 shield)	300 W/cm

Annual estimates are conservatively based on seven cycles per year.