Criticality experiments and benchmarks Criticality experiments and benchmarks for for validation of cross validation of cross sections: the neptunium sections: the neptunium case case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, J.Wilson, D. Tarrio, B. D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Berthier, I. Duran, C. Le Naour, C. Stephan Institut de Physique Nucleaire, Orsay; Facultad de fisica, Universidade de Santiago de Compostela, Spain Introduction Verification of 25-28 Septembre, 2012, Aix-en-Provence Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Neptunium 237 Criticality experiments and benchmarks for validation of cross sections: the 1 Abundant waste produced in present thermal nuclear neptunium case reactors. L.S.Leong, L.Tassan-Got, 2 T 1 / 2 = 2 My. L.Audouin, C. Paradela, 3 Candidate for incineration in fast neutron reactors. J.Wilson, D. Tarrio, B. 4 Burning 237 Np needs a better knowledge of neutronic Berthier, I. Duran, C. Le Naour, C. properties (neutron cross sections(XS) ). Stephan Introduction Verification of Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Motivation Criticality 237 Np / 235 U experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Introduction Figure : Ref: C. Paradela et al, Phys. Rev. C82 (2010), 034601. Although most of the measurements are in agreement with each Verification of Cross Section others, the last data obtained at the CERN n TOF facility are about Experiment Simulation 5% to 6% higher than the others beyond 1 MeV. IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
237 Np status Criticality experiments and benchmarks However! Several previous measurements are not for validation of cross independent. sections: the neptunium ENDF-B7.0 based on Tovesson measurement(2008). case L.S.Leong, 2 Tovesson’s one normalised to ENDF-B6.8 at 14 MeV. 1 L.Tassan-Got, L.Audouin, C. 3 ENDF-B6.8 based on Lisowski’s measurement(1988). Paradela, J.Wilson, D. 4 Lisowski normalized to Meadows (1983) between 1 and 10 Tarrio, B. Berthier, I. MeV Duran, C. Le Naour, C. Stephan 5 n TOF measurement consistent with data at 14 MeV within the experimental uncertainty of 4% Introduction Verification of 237 Np cross section is necessary Verification of Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Verification of 237 Np Cross Section Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le 237 Np+ 235 U Sphere critical model is critical experiment Naour, C. 1 Stephan measurement performed in Los Alamos and proposed as a Introduction benchmark for neutron transport simulations Verification of 235 U retains 86% of the mass, criticality is still sensitive to 2 Cross Section fission of 237 Np. (0.3% uncertainty) Experiment Simulation IPNO 3 K eff = 1 . 0019 ± 0 . 0036 (experimental value) Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Los Alamos Experiment Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Figure : a neutron source inside Np, ( K eff : Mutiplicatif factor) Introduction 1 N = 1 + K eff + K 2 eff + K 3 eff + ... = 1 − K eff ; N d = ǫ 1 − K eff Verification of Cross Section Final result: K eff = 1 . 0019 ± 0 . 0036 Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Simulation with MCNP5/MURE Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, Our work: J.Wilson, D. Tarrio, B. Compute the same Benchmark with same conditions. Berthier, I. Duran, C. Le ( K eff = 0 . 9942 (exp-2 σ ) ) Naour, C. Stephan —————————————————– Substitute nTOF Np XS in place of the evaluated data Introduction ENDF/B-7.0’s one. Verification of Cross Section Result: criticality increased K eff = 1 . 0043 (exp+0.8 σ ) . Experiment Simulation 237 Np fission XS could be higher than previous measurements. IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, 235 U inelastic cross section L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Introduction Verification of Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Inelastic cross section Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Introduction Verification of Cross Section Experiment Simulation IPNO Inelastic cross section Figure : L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Criticality distribution the generated configurations Random variation of XS for excitation of the 235 U levels. Criticality experiments Criticality of 235 U sphere benchmark should remain invariant: and benchmarks (selection among the generated XS configurations) for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Introduction Verification of Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Criticality experiments and benchmarks for validation of cross sections: the neptunium case L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Figure : Criticality according to the continuum reduction Introduction Continuum (MT=91), bears most of the effect on Verification of Cross Section criticality. Experiment Variation of criticality by the modification of MT=91, to Simulation IPNO get closer to the experimental value Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
Criticality experiments and benchmarks for validation of cross sections: the neptunium case Is 40% reduction of the continuum inelastic L.S.Leong, L.Tassan-Got, compatible with existed measurements (Knitter L.Audouin, C. Paradela, J.Wilson, D. and Batchelor)? Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Introduction Verification of Cross Section Experiment Simulation IPNO Inelastic cross section L.S.Leong, L.Tassan-Got, L.Audouin, C. Paradela, J.Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour, C. Stephan Criticality experiments and benchmarks for validation of cross sections: Reason
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