Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV Jun ZOU, Mengping SUN, Fang WANG, Liqin HU*, Yican WU, FDS Team Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui, 230031, China * Corresponding author: Liqin HU, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui, China, 230031. Tel: +86 551 65591087; Fax: +86 551 6559 3686 Email address: liqin.hu@fds.org.cn, Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV Jun ZOU, Mengping SUN, Fang WANG, Liqin HU, Yican WU, FDS Team Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui, 230031, China Abstract: To improve the accuracy of the neutronics analyses for the accelerator driven subcritical system (ADS) with complex energy spectrum structures and strong physical effects, a coupled neutron and photon (366 n + 42γ) multi-group cross section library HENDL-ADS/MG (Hybrid Evaluated Nuclear Data Library) for neutron energy up to 150MeV based on FENDL3, JENDL-He and TENDL-2009 was produced by FDS team. To validate and qualify the reliability of the high-energy cross section in HENDL-ADS/MG library, the shielding, critical safety and JAEA 800MW ADS benchmarks, have been performed for HENDL-ADS/MG. These testing results indicate that HENDL-ADS/MG has accuracy and reliability. KEYWORDS: Accelerator Driven Subcritical System, Nuclear Data Library, Bendarenko, neutron integrated benchmark Corresponding author at: Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui, China, 230031. Tel.: +86 551 65591087; fax: +86 551 6559 3686. E-mail address: liqin.hu@fds.org.cn Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV 1. Introduction Accelerator Driven subcritical System (ADS) is recognized as an efficient nuclear waste transmutation device. Recently, Chinese Academy of Sciences has made a plan to research and develop ADS. The concept of China Lead-based Reactor (CLEAR)[1-3] is proposed and developed by FDS Team[4-10]. Neutronics calculations and analysis are necessarily involved in designs of ADS, and nuclear data libraries are the basis of nuclear analysis. At present, the nuclear data libraries during the world can’t fully meet the needs of nuclear analysis in ADS system with complex energy spectrum structures and strong physical effects. In this study complex physical effects and great energy spans accelerator driven subcritical system have been analyzed and studied. The great energy spans were solved by extending energy group and iteration methods, and physical effects were corrected by Bendarenko[11] and flux calculator methods[12] in the design of nuclear data libraries of ADS system. On the basis of the analysis and studies, a coupled neutron and photon (366 n + 42γ) cross section library HENDL-ADS/MG (Hybrid Evaluated Nuclear Data Library) based on FENDL3[13], JENDL-He[14] and TENDL-2009[15] has been produced by FDS Team. The neutron cross section of HENDL-ADS/MG has energy range from 10-5eV to 150 MeV. For HENDL-ADS/MG data library, in the range of unresolved resonance region (100 eV~10 keV) have been treated with Bondarenko method, but in the range of resolved resonance region (4 eV~100 eV), should be treated with flux calculator method. In order to test the availability and reliability of the HENDL-ADS/MG data library, shielding and critical safety benchmarks were performed in this paper using VisualBUS[16-22] code. The discrepancy between calculation and experimental values of nuclear parameters falls into a reasonable range. To validate and qualify the reliability of the high-energy cross section for HENDL-ADS/MG library, the shielding, critical safety and JAEA 800MW ADS benchmarks, have been performed for HENDL-ADS/MG. These benchmark results indicated that HENDL-ADS/MG had accuracy and reliability. Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV 2. Design of HENDL-ADS/MG The neutron energy span is large, for the accelerator driven subcritical system, its neutron energy had a range from 10-5eV to 150MeV. The group structure was 366 neutron groups, 42 gamma groups. And the complex physical effects including resonance self-shielding, thermal neutron up-scattering effect also should be considered in the design of HENDL-ADS/MG. In the range of unresolved resonance region (100 eV~10 keV), self-shielding effect can be treated with Bendarenko method. But in the range of resolved resonance region (4~100 eV), it should be treated with flux calculator. And then, the neutron energy structure, weight function and complex physical effects were introduced. 2.1. Selection of Evaluated Nuclear Data Files The HENDL-ADS/MG consisting of 408 nuclide cross-section files, which include moderators, structural materials, fission products and actinides were developed. The neutron evaluated nuclear data files were FENDL3 , JENDL/He-2007 and TENDL-2009, the photo-atomic data was ENDF/B-VI[23]. 2.2.Design of Energy Structure and Weight Function Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV 2.2.1. Energy Structure For HENDL-ADS/MG data library, the neutron energy was from 10-5eV to 150MeV. The neutron structure up 20MeV was 51 groups. The selection of neutron energy boundary from 20MeV to 150 MeV accorded as cross section threshold and lethargy. The lethargy width is 0.05. The portion below 4.0eV of the neutron group structure of HENDL-ADS/MG was a detailed thermal structure, which was finer than the WIMSD-69[24] structure. And the group in the epithermal range was finer than 175-group. The other group structure was similar to that of Vitamin-J[12]. The gamma structure from 1keV to 50 MeV was 42 groups. The energy structure of HENDL-ADS/MG can meet the need of nuclear design for ADS system. 2.2.2. Weight Function The accelerator driven subcritical system is driven by spallation neutron source, which has neutron spectrum mixed with spallation and fission. The neutron weight function of HENDL-ADS/MG had the following segments: a 0.0253-eV thermal Maxwellian below 4 eV, a l/E law from 4 eV to 2.12 MeV, a 1.415-MeV fission spectrum from 2.12 to10 MeV, another l/E section from 10 to 12.52 MeV, a fusion peak between 12.52 and 15.68 MeV, a final l/E section from 15.5 to 19.64 MeV, and an adopted 1/E spectrum from 19.64 to 150 MeV according to optimization analysis. The gamma weight function was 1/E + roll-offs between 1keV and 50 MeV. The thinning tolerance in BROADR was 0.1% and the number of probability bins in PURR was 20. Legendre order was P-6 for transport correction to P-5. 2.3. Correction for Physical Effects 2.3.1. Resonance Self-Shielding Effect The correction of resonance self-shielding effect was implemented by making multi-group cross section data library with different reference background cross sections. The precision of correction self-shielding effect was determined by the selection for background cross sections[25-27] in the design of HENDL-ADS/MG. There Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV were 10 reference background cross sections for the nuclides in HENDL-ADS/MG. And the reference background cross sections were chosen according to the compositions which the nuclides were likely to be used. In this study, the typical design for ADS subcritical system also should be considered in the selection for background cross sections. The following was the reference background cross-sections (barns) for Pu239: 1010 ,104 ,103 102 ,50, 10, 1 ,0.5 , 0.3, 0.1. 2.3.2. Thermal Upscattering Effect The thermal scatter cross section was made in HENDL-ADS/MG to solve the thermal upscattering effect in the nuclear analysis for sub-critical system. The following was the main parameters for thermal scatter cross section : 1)Tolerance: 0.1% ; Maximum energy: 4 eV 2)Scattering laws: a) H-1:S(α,β) for hydrogen bound in water b) H-2:S(α,β) for deuterium bound in heavy water c) C:S(α,β) for carbon in graphite d) Be9: S(α,β) for carbon in Beryllium e) Free gas model for all materials 3. Benchmark Calculation To test the accuracy and reliability of HENDL-ADS/MG, shielding and critical safety benchmarks were performed in this paper using VisualBUS code. In order to test the reliability of cross section with high neutron energy, the transport calculations for high neutronics integral experiments in TIARA were accomplished by the use of HENDL-ADS/MG library. Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV 3.1 Critical Safety Benchmark The critical spheres were derived from International Criticality Safety Benchmark Evaluation Project[28]. The calculation code was VisualBUS. Based on criticality calculations using VisualBUS and the HENDL-ADS/MG library, the agreement between experimentally measured and computed values of Keff was very good. As shown in Table 1, the relative error of computed Keff for all experiments was within almost 0.5%. Table 1 computational and experimental Keff of spherical shells VisualBUS HENDL-ADS/MG 0.99649 0.99732 1.00400 1.00211 1.00492 0.99951 1.00033 1.00432 1.00481 1.00258 0.99629 Critical spheres U233-MET-FAST-001 U233-MET-FAST-002 HEU-MET-FAST-001 HEU-MET-FAST-027 PU-MET-FAST-001 PU-MET-FAST-005 PU-MET-FAST-035 SPEC-MET-FAST-008 SPEC-MET-FAST-001 U233-SOL-THERM-001 PU-SOL-THERM-002 VisualBUS ENDF-B/VII 0.9931 0.9954 0.9972 1.0090 0.9969 1.0080 1.0035 1.0073 1.0074 1.0020 1.0004 Experiment Values 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000 1.0026 1.0000 1.0005 1.0000 3.2 Shielding Benchmark These benchmark experiments were based on sphere shell geometry with 14MeV D-T fusion neutron source at the center of the inner void sphere. The detailed description of these experiments can be found in Refs[29-30]. The simulation results of C/E (calculated/experimental) values of integral neutron leakage rate using VisualBUS& HENDL-ADS/MG and ENDF/B-VII, and the corresponding experimental measured values were all listed in Table 2. Table 2 results of neutron leakage rate Sphere Shell Be Al Energy ranger (MeV) 0.003~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.003 0.1~1.0 1.0~5.0 5.0~10.0 Experiment values (1/sn) .469 .315 .143 .324 1.26 .069 .148 .050 Integrated neutron leakage rate C/E VisualBUS VisualBUS HENDL-ADS/MG (ENDF-B/VII) 1.03 0.99 0.85 0.84 0.94 0.90 1.35 1.20 1.06 0.99 0.72 0.62 0.78 0.76 0.77 0.79 Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV Ti V Cr Fe Cu Zr W Pb 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.05~1.0 1.0~5.0 5.0~10. 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.1~1.0 1.0~5.0 5.0~10.0 10.0~20.0 >0.1 0.4~0.8 0.8~1.4 1.4~2.5 2.5~4.0 4.0~6.5 6.5~10.5 10.5~20.0 >0.4 .675 .942 .086 .152 .038 .598 .874 .391 .301 .0377 .381 1.11 .211 .221 .041 .549 1.02 .099 .140 .032 .740 1.01 .660 .145 .013 .079 .898 .442 .307 .033 .317 1.10 .360 .241 .040 .710 1.35 .173 .212 .231 .100 .035 .038 .489 1.28 1.12 1.02 1.16 0.93 0.84 1.27 1.20 1.10 1.11 1.02 0.89 1.03 1.04 1.04 0.97 1.01 1.02 1.24 1.10 0.99 0.98 1.01 1.05 1.02 1.20 1.07 1.01 1.20 1.04 0.97 1.31 1.17 1.13 0.74 0.43 0.94 0.94 1.17 1.08 1.15 1.13 0.88 0.62 1.00 1.04 1.10 1.03 1.31 0.93 0.84 1.27 1.20 1.21 1.05 1.22 0.88 1.06 1.07 1.13 1.14 0.97 1.04 1.30 1.22 1.02 0.96 1.03 0.99 1.17 1.26 0.93 1.01 1.20 1.00 0.95 1.36 1.18 1.11 0.79 0.44 0.93 0.94 1.00 1.04 1.05 1.00 0.88 0.71 1.07 1.02 The neutron leakage spectra results showed that a good agreement between HENDL-ADS/MG and the experiment results in the Be, Fe, Ti, V, Cr, Cu, and Zr spherical shell. For the spherical shell of Al, W, the difference of neutron leakage spectra was more than 30% between VisualBUS with HENDL-ADS/MG and experiment. But the calculations with HENDL-ADS/MG were almost the same as ENDF-B/VII (point-wise) calculations for these models. The difference between experiment and calculation may be caused by the error of measurement. Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV 3.3 ANALYSIS OF NEUTRON SHIELDING EXPERIMENT AT JAERI/TIARA In order to validate and qualify the reliability of the high-energy cross section for HENDL-ADS/MG library, the high neutronics integral experiments[31]—TIARA (JAERI) have been performed by VisualBUS& HENDL-ADS/MG. The test shield of Iron, Lead, Graphite and Cement from 10cm to 60cm in thickness was located at the end of the collimator with or without an additional sample shield. Neutron spectra were measured with NE213 detectors on the beam axis and at 5~7cm off the beam axis behind the test shield. The energy of incident proton was 65MeV. The comparison between the calculations and measurements for neutron spectra above 10MeV on the beam axis is carried out in this paper. The analysis with VisualBUS and HENDL-ADS/MG were carried out. At the same time, Monte Carlo calculations with MCNPX[32] code and LA150[33] data library were also carried out for the benchmark analyses in order to make a comparison with those of HENDL-ADS/MG. The results are shown in Fig1~Fig4. EXP-20 EXP-40 LA150-20 LA150-40 HENDL-ADS-20 HENDL-ADS-40 Neution Flux((n/Sr/MeV/proton) Neution Flux((n/Sr/MeV/proton) 1E-11 1E-12 1E-13 1E-14 EXP-10 EXP-20 EXP-30 LA150-10 LA150-20 LA150-30 HENDL-ADS-10 HENDL-ADS-20 HENDL-ADS-30 1E-10 1E-11 1E-12 1E-13 1E-15 0 10 20 30 40 50 60 70 0 10 20 Neutron Energy(MeV) Fig1 Iron Shield Experiment Benchmark 1E-10 1E-11 1E-12 1E-13 1E-14 1E-15 1E-16 10 20 30 40 50 50 60 70 60 Neutron Energy(MeV) Fig3 Graphite Shield Experiment Benchmark EXP-20 EXP-50 LA150-20 LA150-50 HENDL-ADS-20 HENDL-ADS-50 1E-10 Neution Flux((n/Sr/MeV/proton) Neution Flux((n/Sr/MeV/proton) 1E-9 40 Fig2 Lead Shield Experiment Benchmark EXP-30 EXP-60 LA150-30 LA150-60 HENDL-ADS-30 HENDL-ADS-60 1E-8 30 Neutron Energy(MeV) 1E-11 1E-12 1E-13 1E-14 0 10 20 30 40 50 60 70 Neutron Energy(MeV) Fig4 Concrete Shield Experiment Benchmark For the Fe, Pb benchmark experiment, the difference of neutron flux was more than 20% between Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV VisualBUS with HENDL-ADS/MG and experiment. But the calculations with HENDL-ADS/MG were almost the same as MCNPX&LA150 calculations for these models, the difference was about 5% between HENDL-ADS/MG with LA150 data library. For graphite, concrete benchmark experiment, the agreement between experimentally measured and calculated values of neutron flux was very good. And the neutron flux calculated with HENDL-ADS/MG agree with the measured ones than those with LA150. 3.4 JAEA 800MW ADS Benchmark In order to test the reliability of HENDL-ADS/MG library applied in the neutronics analysis for ADS, the JAEA 800MW ADS[34] benchmark have been performed by VisualBUS& HENDL -ADS/MG. The JAEA 800MW ADS benchmark problem was proposed as one of the problems discussed in the International Atomic Energy Agency (IAEA) Coordinated Research Project (CRP) on “Analytical and experimental benchmark analyses of accelerator driven systems [35]”. The purpose of this benchmark problem was to obtain fundamental knowledge of calculation accuracy for a commercial grade ADS. Figure 5 shows the RZ calculation model and the initial homogeneous number densities of each fuel region. Fig5 RZ calculation model and Fuel composition In this paper, the Keff value at beginning of cycle (BoC) for JAEA 800MW ADS model were calculated by HENDL-ADS/MG. At the same time, Monte Carlo calculations with VisualBUS code and point-wise nuclear data libraries HENDL-ADS/MC [36] (same evaluated source with HENDL-ADS /MG), JENDL-4.0, ENDF/B-VII.1 and JEFF-3.1 were also carried out for the benchmark analyses in order to make a comparison Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV with those of HENDL-ADS/MG. The calculated results were all listed in Table 3. Table3 Keff by different data library Nuclear data Keff HENDL-ADS/MG 0.9843 HENDL-ADS/MC 0.9834 JENDL-4.0 0.9776 ENDF/B-VII.1 0.9820 JEFF-3.1 0.9923 Mean 0.9839 *Relative Deviation from the mean=(Keff value-Mean)/Mean×100 Rel. Dev (%)* 0.049% -0.043% -0.632% -0.185% 0.862% 0 The agreement between HENDL-ADS/MG and mean value of Keff was good. As shown in Table 7, for HENDL-ADS/MG, the relative deviation from the mean was about 0.049%. The calculations with HENDL-ADS/MG were almost the same as that with HENDL-ADS/MC. This result showed that the design of energy structure and weight function for HENDL-ADS/MG was rational and accurate. This benchmark result of JAEA 800MW ADS preliminary confirmed the reliability of HENDL-ADS/MG library applied in the neutronics analysis for ADS. 4 Conclusions In this study, a coupled neutron and photon (366 n + 42γ) multi-group cross section library HENDL-ADS/MG for neutron energy up to 150 MeV based on FENDL3, JENDL-He and TENDL-2009, has been developed, which considered complex physical effects including resonance self-shielding in the nuclear analysis for ADS subcritical system. The shielding and critical safety benchmarks were performed in this paper. The discrepancy between calculation and experimental values of nuclear parameters falls into a reasonable range. To validate and qualify the reliability of the high-energy cross section for HENDL-ADS/MG library, the transport calculations for neutronics integral experiments in the high-energy range have been performed. In order to test the reliability of this library applied in the neutronics analysis for ADS, the JAEA 800MW ADS benchmark have been performed by HENDL-ADS/MG. These testing results indicated that HENDL-ADS/MG has accuracy and Development and Testing of HENDL-ADS/MG Cross Section Library for Neutron Energy up to 150 MeV reliability. Acknowledgements This work was supported by the “Strategic Priority Research Program” of the Chinese Academy of Sciences under grant No. XDA03040000 , the National Natural Science Foundation of China (No. 91026004 and 11305205), the National Special Program for ITER (No. 2014GB1120001), the Informatizational Special Projects of Chinese Academy of Sciences(No. XXH12504-1-09), and the Natural Science Foundation of China under grant No.51076166. We thank our colleagues Jieqiong Jiang, Zhong Chen, Yan Chen, Jing Song for their help. 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