Abstract
The objective of the research was to test available photoatomic data libraries for fusion relevant applications, comparing against experimental and computational neutronics benchmarks. Photon flux and heating was compared using the photon interaction data libraries (mcplib 04p, 05t, 84p and 12p). Suitable benchmark experiments (iron and water) were selected from the SINBAD database and analysed to compare experimental values with MCNP calculations using mcplib 04p, 84p and 12p. In both the computational and experimental comparisons, the majority of results with the 04p, 84p and 12p photon data libraries were within 1σ of the mean MCNP statistical uncertainty. Larger differences were observed when comparing computational results with the 05t test photon library. The Doppler broadening sampling bug in MCNP-5 is shown to be corrected for fusion relevant problems through use of the 84p photon data library. The recommended libraries for fusion neutronics are 84p (or 04p) with MCNP6 and 84p if using MCNP-5.
Highlights
Several photon libraries are available for use with the MCNP-X, MCNP-5 and MCNP-6 code packages [1, 2] such as the 04p, 84p, 05t and 12p libraries
Photon flux calculated using the 04p, 84p and 12p data libraries with MCNP-6 was evaluated for the experimental Photon Leakage Spectra benchmarks [4,5,6] available in SINBAD [7]
The photon libraries 04p and 84p are identical in cross-section data and differ only in the format of the data provided. This is observed in results from both the spherical test case and the DEMO benchmark
Summary
Several photon libraries are available for use with the MCNP-X, MCNP-5 and MCNP-6 code packages [1, 2] such as the 04p, 84p, 05t and 12p libraries. Their performance, including the use of the Doppler broadening treatment, was investigated using computational models. A spherical model and an EU fusion demonstration reactor with a helium cooled lithium lead blanket (HCLL DEMO) benchmark model [3] were used. Photon flux calculated using the 04p, 84p and 12p data libraries with MCNP-6 was evaluated for the experimental Photon Leakage Spectra benchmarks [4,5,6] available in SINBAD [7]. The measurements performed at RFNC-VNIITF, Snezhinsk, using a 14 MeV D-T neutron source placed in the centre of spherical samples of different materials were selected for the comparison exercise
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