Abstract
During operation of the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory the mechanical properties of the AISI 316L target module are altered by high-energy neutron and proton radiation. The interior surfaces of the target vessel are also damaged by cavitation-induced erosion, which results from repetitive rapid heating of the liquid mercury by high-energy proton beam pulses. Until recently no observations of cavitation-induced erosion were possible for conditions fully prototypic to the SNS. Post-Irradiation Examination (PIE) of the first and second operational SNS targets was performed to gain insight into the radiation-induced changes in mechanical properties of the 316L target material and the extent of cavitation-induced erosion to the mercury vessel inner surfaces. Observations of cavitation-induced erosion of the first and second operational SNS target modules are presented here, including images of the target vessel interiors and specimens removed from the target beam-entrance regions.
Original language | English |
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Pages (from-to) | 147-159 |
Number of pages | 13 |
Journal | Journal of Nuclear Materials |
Volume | 431 |
Issue number | 1-3 |
DOIs | |
State | Published - Dec 2012 |
Funding
The authors would like to thank Ashraf Abdou and Ken Gawne for providing some of the figures presented in this paper and accompanying presentation. The SNS is sponsored by the Office of Science, US Department of Energy, and managed by UT-Battelle, LLC for the US Department of Energy under Contract DE-AC05-00OR22725.