2015-12-251 Benchmarks for Data Testing of Iron China Nuclear Data Center(CNDC) China Institute of Atomic Energy(CIAE) P.O.Box 275-41,Beijing 102413, P.R.China.

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Benchmarks for Data Testing of Iron China Nuclear Data Center(CNDC) China Institute of Atomic Energy(CIAE) P.O.Box ,Beijing , P.R.China Ping Liu

1. Introduction

CIELO/Iron According to CIELO project, CNDC are working on the improvement of Iron evaluations, especially on the experimental data evaluations of Iron CNDC validated the evaluations of iron with both shielding and criticality benchmarks

The method of benchmarks testing Selecting integral benchmarks Using the transport codes to perform benchmark simulations Analyzing benchmarking results Providing feedbacks to evaluator Key points of above procedure Suitable benchmarks Quantitative feedbacks to evaluators To meet above requirements, related works have been done at CNDC Study on how to select integral benchmarks Development of nuclear data adjustment code (H. Wu’s presentation on SG39 meeting, May 2015)

2. Benchmarks Testing of Iron

Data processing Evaluated data library CENDL-3.1 ENDF/B-VII.1 JENDL-4.0 CENDL-NP Processing of evaluated data files NJOY ACE format library

Integral benchmarks Transport Code MCNP5 Benchmarks Criticality (ICSBEP) Shielding (LLNL, FNS/JAPAN)

Benchmarks The methodology of selecting benchmarks - The weight (lost to capture) of 56 Fe > 1% Cases of benchmarks Criticality benchmarking

Identification LaboratoryCase Label Cladding material Fuel formFuel materialReflector material Moderator material PU-MET-FAST-015 IPPE, Russia SteelMetal / AlloyPlutonium MetalIronNone PU-MET-FAST-025 VNIIEF, RussiaSimplified ModelMetal / AlloyPlutonium MetalSteelNone PU-MET-FAST-026 VNIIEF, RussiaSimplified ModelMetal / AlloyPlutonium MetalSteelNone PU-MET-FAST-028 VNIIEF, RussiaSimplified ModelMetal / AlloyPlutonium MetalSteelNone PU-MET-FAST-032 VNIIEF, RussiaSimplified ModelMetal / AlloyPlutonium MetalSteelNone HEU-MET-FAST-013 LANL, USA.0625-in.-thick FePolyethyleneMetal / AlloyUranium MetalPolyethylene HEU-MET-FAST-021 VNIIEF, RussiaSimplified ModelMetal / AlloyUranium MetalSteelNone HEU-MET-FAST-024 VNIITF, Russia Metal / AlloyUranium MetalSteel + PolyethyleneNone IEU-MET-FAST-005 VNIIEF, RussiaSimplified ModelMetal / AlloyUranium MetalSteelNone IEU-MET-FAST-006 VNIIEF, RussiaSimplified ModelMetal / AlloyUranium MetalDuraluminNone HEU-MET-THERM-013 LANL, USA15-mil-thick FePolyethyleneMetal /AlloyUranium MetalPolyethylene HEU-MET-THERM-015 LANL, USA PolyethyleneMetal / AlloyUranium MetalPolyethylene HEU-MET-INTER-001 ANL, USAZPR-9/34Metal / AlloyUranium MetalSteelNone PU-MET-INTER-002 ANL, USAZPR-6/10SteelMetal /AlloyPlutonium MetalSteel + IronGraphite MIX-COMP-FAST-001 ANL, USAZPR-6/7SteelCompoundDepleted UraniumNone

Criticality benchmarking

Criticality benchmarking

Criticality benchmarking

Criticality benchmarking Identification ALIAS EALF (MeV) K eff ICSBEP uncertainty (1 sigma) C/E of k eff CENDL-NPCENDL-3.1ENDF/B-VII.0/1 PU-MET-FAST-015BR PU-MET-FAST-025pmf PU-MET-FAST-026pmf PU-MET-FAST-028pmf PU-MET-FAST-032pmf HEU-MET-FAST-013VNIITF-CTF-SS HEU-MET-FAST-021VNIITF-CTF-SS HEU-MET-FAST-024VNIITF-CTF-SS IEU-MET-FAST-005VNIITF-CTF-SS IEU-MET-FAST-006VNIITF-CTF-SS HEU-MET-THERM-013hmt E HEU-MET-THERM-015hmt E HEU-MET-INTER-001ZPR-9/ PU-MET-INTER-002ZPR-6/ MIX-COMP-FAST-001ZPR-6/

Results analysis C/E of k eff for steel/iron benchmarks (without PMI002 and HMT013_2) HMT013_2 is not a good one for validating iron data, because the polyethylene brings serious overestimation of k eff, but not 56 Fe. The similar overestimation of k ef is also occurred in PMI002. Regardless of HMT013 and PMI002, the criticality results of iron are not so bad. Criticality benchmarking

With the increase of weight, k eff has an increasing tendency With the increase of weight, k eff has an increasing tendency

Benchmarks Lawrence Livermore pulsed sphere (LLNL) FNS (JAPAN) Shielding benchmarking

Benchmarking results Neutron leakage angular flux from 5cm-thick iron Shielding benchmarking

Shielding benchmarking Neutron leakage current from iron sphere The results indicate that cross sections and neutron emission spectra for inelastic scattering reactions are needed to be improved

Shielding benchmarking The contribution of secondary neutron in 2-10 MeV is mainly from inelastic scattering of discrete energy level and the continuous energy level

3. Summary

CENDL-3.1 shows good performance for most criticality benchmarks, but the performance of CENDL-3.1 for shielding benchmarks is not good. For criticality benchmarking Not all benchmarks are suitable for data testing of Iron HMT013_2 and PMI002 are not suitable to validate the Iron Further study on the selection of benchmarks is needed For shielding benchmarking The results indicate that cross sections and neutron emission spectra for inelastic scattering reactions data from CENDL are need to be improved