Abstract
In the framework of Phase I of the MYRRHA project implementation, the superconducting linear accelerator with proton beam parameters 100 MeV, 4 mA is going to be built. To stop the beam, a beam dump based on Al-6061 alloy is designed. The evaluation of radiological impact of an accidental radioactivity release requires the reliable estimates of primary radiation source terms with associated uncertainties. The article addresses the propagation of nuclear data uncertainties through beam dump activation calculations. The Total Monte Carlo approach was used to generate large number of random excitation functions for residual products of proton interactions with materials of Al-6061 alloy. The residual products do not impose any feedback on proton and neutron spectra in the beam dump, moreover the calculation of the production rates is sufficient to obtain uncertainties on final activities. This significantly accelerates the uncertainty quantification allowing to study the convergence of mean and higher moments (variance, variance of variance) for individual nuclides.
Highlights
The Multi-purpose hYbrid Research Reactor for Hightech Applications, MYRRHA, is being designed at SCK CEN since 1998 [1]
As detailed in [2], in this new approach the MYRRHA facility will start with the 100 MeV accelerator and will be followed by the 100-600 MeV accelerator section and by the reactor
At the design stage of MINERVA, it is possible to propagate only basic design uncertainties to the quantities of interest which are in this case primary radiation source terms
Summary
The Multi-purpose hYbrid Research Reactor for Hightech Applications, MYRRHA, is being designed at SCK CEN since 1998 [1]. As detailed in [2], in this new approach the MYRRHA facility will start with the 100 MeV accelerator (phase 1) and will be followed by the 100-600 MeV accelerator section (phase 2) and by the reactor (phase 3). At the level of the proton accelerator the first phase consists of building and operating the linac limited to 100 MeV final beam energy. In phase 1 it is foreseen to transport a 10 % fraction of the 100 MeV beam to a target station for innovative medical radioisotopes production by an Isotope Separation On-Line (ISOL) technique. MINERVA (MYRRHA Isotopes ProductioN coupling the linEar acceleRator to the Versatile proton target fAcility) is the name of the project that combines the phase 1 100 MeV linac, the ISOL target station, the target station for fusion materials research and all the associated services and buildings.
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