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Publication Figures

Publication Date:
2019-07-05

First Author:
M. R. Gilbert

Title:
Experimental decay-heat simulation-benchmark for 14 MeV neutrons & complex inventory analysis with FISPACT-II

Paper Identifier:
CP/19/51

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Figure Reference Title Description Number of Figure Data Items Identifier Download Figure Details
figure 1 Figure 1 Simulated neutron spectra experienced by the two experimental batches performed at JAEA’s FNS facility and discussed in this paper. Flux values are scaled (divided) by lethargy to remove weighting bias caused by the varying energy-bin widths. Lethargy is the natural log of the ratio of an energy bin’s upper and lower bounds. 1 CF/19/52 Download
figure 2 figure 2 Simulated decay-heat experiment for nickel in the FNS benchmark. (a) and (c) correspond to decay-heat following 5-minute irradiations, (b) and (d) are the equivalent data after 7-hour irradiations. (a) and (b) show total decay-heat curves on linear time-afterirradiation scales for the different nuclear library simulations with FISPACT-II, the experimental measurements as points with vertical lines showing experimental uncertainty, and the nuclear-data-uncertainty band (in grey) for the TENDL-2017 [30] library. (c) and (d) present the radionuclide breakdown of contributions to the total decay heat from the TENDL-2017 simulations in absolute W/g terms (top halves) and as % contributions (bottom halves) – on logarithmic time-after-irradiation scales. 1 CF/19/54 Download
figure 3 figure 3 Radionuclide breakdown of contributions to the total decay-heat from the TENDL-2017 simulations of pure iron after (a) 5-minute and (b) 7-hour irradiations. Absolute W/g curves are shown in the top halves of both plots, with%contribution-curves shown in the lower halves. The FNS benchmark experimental decay-heat measurements are also shown in the upper plots. All times are given as time-after-irradiation in years on a logarithmic scale. 1 CF/19/56 Download
figure 4 figure 4 Simulated decay-heat experiment for a 7- hour irradiation of niobium in the FNS benchmark. (a) shows total decay-heat curves on a linear time-after-irradiation scale for inventory simulations with different nuclear libraries, as well as the experimental measurements as points with vertical lines showing experimental uncertainty, and the nuclear-data-uncertainty band (in grey) for the TENDL- 2017 [30] library. (b) presents the radionuclide breakdown of contributions to the total decay heat from the TENDL-2017 simulation in absolute W/g terms on a logarithmic time-after-irradiation scale. (c) shows the equivalent profiles for the simulation with ENDF/B-VIII.0 1 CF/19/58 Download
figure 5 figure 5 TENDL-2017 and EXFOR-differential cross sections for (n,2n) on 93Nb. Grey uncertainty bands shown for each cross section (xs) curve are based on covariance data in the TENDL- 2017 library. The TENDL-2017 total is the sum of the channels to the different daughter isomeric states (and the uncertainty band in this case comes from the individual errors summed in quadrature). EXFOR [16] data is separated into differential points (a mixture of experimental, derived, and calculated values) identified as corresponding to the metastable 92mNb or total (no EXFOR data is directly attributed to the xs to the ground-state). Quoted uncertainties in energy and xs for each differential point are shown as horizontal and vertical error-bars. The neutron energy-flux spectrum for the 7-hour FNS irradiation is also shown (using the right hand y-axis flux scale). 1 CF/19/60 Download
figure 6 fgiure 6 Simulated decay-heat experiment for tungsten in the FNS benchmark. (a) and (c) correspond to decay-heat following 5-minute irradiations, (b) and (d) are the equivalent data after 7-hour irradiations. (a) and (b) show total decay-heat curves on linear time-afterirradiation scales for the different nuclear library simulations with FISPACT-II, the experimental measurements as points with vertical lines showing experimental uncertainty, and the nuclear-data-uncertainty band (in grey) for the TENDL-2017 [30] library. (c) and (d) present the radionuclide breakdown of contributions to the total decay heat from the TENDL-2017 simulations in absolute W/g terms (top halves) and as % contributions (bottom halves) – on logarithmic time-after-irradiation scales. 1 CF/19/62 Download
figure 7 figure 7 TENDL-2017 and EXFOR-differential cross sections for (n,2n) on 186W. Grey uncertainty bands shown for each cross section (xs) curve are based on covariance data in the TENDL- 2017 library. The TENDL-2017 total is the sum of the channels to the different daughter isomeric states (and the uncertainty band in this case comes from the individual errors summed in quadrature). EXFOR [16] data is separated into differential points (a mixture of experimental, derived, and calculated values) identified as corresponding to production of the metastable 185mWor to the total xs. Quoted uncertainties in neutron energy and xs for each differential point are shown as horizontal and vertical error-bars. The neutron energy-flux spectrum for the 5-minute FNS irradiation is also shown (using the right hand y-axis flux scale). 1 CF/19/64 Download
figure 8 figure 8 Simulated decay-heat experiment for chromium in the FNS benchmark. (a) and (c) correspond to decay-heat following 5-minute irradiations, (b) and (d) are the equivalent data after 7-hour irradiations. (a) and (b) show total decay-heat curves on linear time-after-irradiation scales for the different nuclear library simulations with FISPACT-II and the experimental measurements as points. Note that the experimental errors and TENDL-2017 uncertainties are plotted (as elsewhere in this paper), but are comparatively small in this case and barely visible on the plotting scales used. (c) and (d) present the radionuclide breakdown of contributions to the total decay heat from the TENDL-2017 simulations in absolute W/g terms (top halves) and as % contributions (bottom halves) – on logarithmic time-after-irradiation scales. Note that the IRDFF-1.05 was not considered in simulations of the cooling after the 5-minute irradiation. 1 CF/19/66 Download
figure 9 figure 9 Simulated decay-heat experiment for a 5-minute irradiation of osmium in the FNS benchmark. (a) shows total decay-heat curves on a linear time-after-irradiation scale for inventory simulations with different nuclear libraries, as well as the experimental measurements as points. Vertical error lines show the experimental uncertainty and a grey band indicates the TENDL-2017 nuclear-data uncertainty. (b) presents the radionuclide breakdown of contributions to the total decay heat from the TENDL-2017 simulation in absolute W/g terms (top half) and as % contributions (bottom half) – on logarithmic time-after-irradiation scale. (c) shows the equivalent absolute and % radionuclide profiles for a FISPACT-II simulation with EAF2010 1 CF/19/68 Download