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Comparison of deterministic and Monte Carlo sensitivity analysis including SAD/SED Ivo Kodeli ,

Comparison of deterministic and Monte Carlo sensitivity analysis including SAD/SED Ivo Kodeli , SG39 Meeting, NEA, Dec. 4, 2015. b eff sensitivity comparison SUSD3D/SERPENT. SG39, NEA, Dec. 4, 2015. b eff sensitivity SUSD3D/SERPENT. b eff sensitivity SUSD3D/SERPENT.

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Comparison of deterministic and Monte Carlo sensitivity analysis including SAD/SED Ivo Kodeli ,

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  1. Comparison of deterministic and Monte Carlo sensitivityanalysis including SAD/SEDIvo Kodeli, SG39 Meeting, NEA, Dec. 4, 2015

  2. beff sensitivity comparison SUSD3D/SERPENT SG39, NEA, Dec. 4, 2015

  3. beffsensitivity SUSD3D/SERPENT

  4. beffsensitivity SUSD3D/SERPENT

  5. beff SAD sensitivity SUSD3D/SERPENT

  6. SNEAK-7A & -7B sensitivity code benchmark exercise (UAM project) SG39, NEA, Dec. 4, 2015

  7. V. Mastrangelo, I. Kodeli, E. Sartori, Proposal of a Benchmark for Stochastic and Deterministic Analyses of Nuclear Data Sensitivities and Uncertainties, UAM Workshop, Pisa, April 2006 Fast reactor benchmarks SNEAK-7A & 7B (Karlsruhe Fast Critical Facility), re-evaluated using detailed 3-D models in the framework of the International Reactor Physics Benchmark Experiments (IRPhE) project, were proposed to test and compare state-of-the-art cross section sensitivity and uncertainty codes. Reference: NEA/NSC/DOC(2006)1 March 2009 Edition – IRPhE Handbook (Evgeny Ivanov, IRSN, CNAM, IPN) http://irphep.inl.gov/handbook/hbrequest.shtml Calculate the sensitivity of keff and beff to the nuclear cross sections and the corresponding uncertainties. Compare and analyse results from different methods and codes for consistency and identify and explain discrepancies. SG39, NEA, Dec. 4, 2015

  8. SNEAK-7A and -7B fast critical experiments (detailed&simplified 3D models). • SNEAK-7A core unit cell consisted of one PuO2-UO2 pellet (26,6% PuO2 and 73,4% UO2) and one graphite platelet. Radial and axial blankets were loaded with metallic depleted UO2 plates. • In SNEAK-7B the graphite platelets were replaced by UnatO2 platelet. • The effective core radii of SNEAK-7A & 7B were 28.63 cm and 37.84 cm. SG39, NEA, Dec. 4, 2015

  9. (a) Measured keff. (b) Combined experimental uncertainty (c) Equal to experimental value + (calculated simplified model – calculated more detailed model) SG39, NEA, Dec. 4, 2015

  10. Contributed solutions Winfried Zwermann: XSUSA Manuele Aufiero: SERPENT2 GPT extended Victor Mastrangelo/W. Zwermann: TSUNAMI 3D Yannick Peneliau, Cyrille De Saint Jean: PARIS & ERANOS Evgeny Ivanov: MCNP6 Ivo Kodeli: SUSD3D SG39, NEA, Dec. 4, 2015

  11. keff and beff sensitivity: Winfried Zwermann, GRS: XSUSA/TWODANT, direct perturbation method,2D Cross sections: ENDF/B-VII Manuele Aufiero, LPSC/CNRS: SERPENT2 with extended GPT option, 2D, Cross sections: JEFF 3.1.1, probability tables Ivo Kodeli, IJS Ljubljana Neutronic and sensitivity code: SUSD3D with PARTISN/TWODANT/THREEDANT Cross sections: 33-group ENDF/B-VII.0, S8P3, processed by NJOY99 2D and 3D models Evgeny Ivanov, IRSN (ongoing) MCNP6 keff sensitivity: Victor Mastrangelo (retired from CNAM and IPN-Orsay) Neutronic and sensitivity code: TSUNAMI-3D; Cross sections: 238-group ENDF/B-VII, P5S 8 Yannick Peneliau, Cyrille De Saint Jean, CEA Cadarache Neutronics & sensitivity codes: ERANOS and PARIS; 2D model Cross sections: Ecco+Sn2d with JEFF 3.1.1 and ENDF/B-VII (33 groups) Sensitivities to cross-sections, total nu-bar and fission spectra Computational Methods and Procedures SG39, NEA, Dec. 4, 2015

  12. SNEAK-7A & -7B (SUSD3D–TSUNAMI3D-PARIS/ERANOS-XSUSA–SERPENT-MCNP5) SG39, NEA, Dec. 4, 2015

  13. SNEAK-7A SAD/SED Sensitivity (k-eff)

  14. CONCLUSIONS • Validation of beta-eff sensitivities calculated by SUSD3D and SERPENT: excellent/good agreement for Jezebel, Flattop-Pu and SNEAK-7A, including SAD/SED sensitivities. • SNEAK-7A & 7B inter-comparison exercise of XS sensitivity and uncertainty codes (UAM project). Several solutions were received using deterministic and stochastic codes (SUSD3D, XSUSA, SERPENT, ERANOS, PARIS, TSUNAMI, MCNP6), different modelisation of the geometry (2D/3D). Good consistency between the sensitivities, both integral values and sensitivity profiles. • Constrained PFNS sensitivity depends on spectra used, unconstrained should be provided to be used in adjustment • Berenice – in cooperation with CEA. SG39, NEA, Dec. 4, 2015

  15. Analysedbenchmarksfrom ICSBEP andIRPhE • SNEAK-7A & -7B: MOX fuel reflected by metallic depleted U. • Jezebel: bare sphere of 239Pu metal, 6.385-cm radius • Skidoo (Jezebel-23): bare ~98.1% 233U sphere; • Popsy (Flattop-Pu): ~20-cm natural U reflected 239Pu sphere; • Topsy (Flattop-25): ~20-cm natural U reflected 235U sphere; • Flattop-23: ~20-cm natural U reflected 233U sphere; • Big Ten: 10% enriched U with U-reflector, cylinder r=41.91cm,h=96.428cm; • ZPPR-9: MOX core with sodium cooling, depleted U blanket. • I. Kodeli, Sensitivity and uncertainty in theeffective delayed neutron fraction (βeff), Nuclear Instruments and Methods inPhysics Research A715 (2013)70-78 WPEC SG39, NEA, Issy-les-Moulineaux, May 19, 2015

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