Radiation damage to the 316 stainless steel target container vessel at SNS

Modeling tensile response and flow localization effects in 316SS after exposure to spallation and fission irradiation environments

“…The other fission exposures produced a He/dpa ratio of on the order of 1 appmHe/dpa or greater depending primarily on the neutron energy spectrum, the Ni content and the levels of B impurities [3]. The spallation environment experiments, which in most cases included irradiation along the direct beam irradiation direction where proton irradiation accompanied the neutron irradiation, produced He/dpa ratios in the range of $40 appmHe/dpa in SNS [5] to $50 appmHe/dpa in LANSCE, depending on the relative numbers and energies of protons and neutrons [4,6]. In addition, substantial amounts of H are also produced in this spectrum and can be retained in the material following irradiation exposure [4].…”

Radiation flux and damage at accelerator-driven spallation neutron sources

“…Thus, it appears that a large part of the calculated underestimates can be removed by shifting from the default GCCI to the Jülich ILVDEN option in running LAHET. The He rate of about 2600 appmHe/yr (Jülich/ MPM-on) for 1000 MeV protons on 316SS at SNS SB (Table 3) is about 2.1 times the earlier estimate ( Table 2 in [1]) using default GCCI/MPM-on options.…”

“…Since the protons are directly incident on the target metal, there is only a slight admixture of lower energy protons in the proton flux. For the 316SS at SNS SB, about 92% of the displacement-producing protons have energies above 900 MeV, and the proton flux of all energies is about 8.5% greater than the incident current density, which is attributed to the secondary protons [1]. Similarly, for the aluminum at SINQ EW more than 98% of the protons in the flux at the center of the entrance window have energies between 569 and 570 MeV [5], and the proton flux of all energies is about 4.6% greater than the incident current density, due to the secondary protons [4].…”

“…As described in [1,2], the SNS SB is a 0.1 cm 3 tally volume, 0.13 cm thick, that extends from the outer to the inner surface of the shell. It is in contact with the Hg spallation target material.…”

Temperature effects on the mechanical properties of candidate SNS target container materials after proton and neutron irradiation

“…In the irradiation experiment, specimens were irradiated with a beam of 800 MeV protons at an average current of 1mA and with spallation neutrons [14,15] emitted from a tungsten target. The exposure for each specimen was dependent on its radial and axial position relative to the beam center and the tungsten target.…”