New evaluations of photon production for JEFF3 WONDER 2012 | Simon - - PowerPoint PPT Presentation

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New evaluations of photon production for JEFF3 WONDER 2012 | Simon - - PowerPoint PPT Presentation

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New evaluations of photon production for JEFF3 WONDER 2012 | Simon Ravaux, David Bernard, Alain Santamarina SEPTEMBER 27 th 2012 8 juin 2012 11 octobre 2012 CEA | 10 AVRIL 2012 CEA | 10 AVRIL 2012 | PAGE 1 | PAGE 1 Importance of the gamma

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8 juin 2012 | PAGE 1 CEA | 10 AVRIL 2012

New evaluations of photon production for JEFF3

SEPTEMBER 27th 2012

WONDER 2012| Simon Ravaux, David Bernard, Alain Santamarina

11 octobre 2012 | PAGE 1 CEA | 10 AVRIL 2012

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 2

Importance of the gamma transport in power reactors

Photon heating predominant in fast reactor’s vessels

From Lüthi’s thesis (EPFL 1999)

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 3

Importance of the gamma transport in power reactors

Photon heating predominant in water reactor’s vessel

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 4

Needed tools for gamma heating calculations

Coupled neutron and photon transport code :

  • APOLLO2, (deterministic)
  • TRIPOLI4, MCNPX (Monte Carlo)

Neutron transport library :

  • JEFF3.1.1, ENDF/B-VII, JENDL4.0

Neutron induced photon production library :

  • JEFF3.1.1, ENDF/B-VII, JENDL4.0

Pḧoton transport library :

  • EPDL91, EPDL97

Gamma production spectrum and multiplicities Need improvements

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 5

Needed improvements for JEFF3.1.1

Energy inconsistencies in JEFF3.1.1 in the gamma production spectrum from neutron capture

57Fe 56Fe

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 6

Needed improvements for JEFF3.1.1

No photon production for all neutron interaction Gd, Cd, Ag, In, … Inconsistent total gamma energy emitted after a radiative neutron capture

54Fe,56Fe,57Fe,58Fe

No primary gamma emitted after a radiative neutron capture

54Fe,57Fe, 58Fe, Hf

Need to generate new gamma production evaluations

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 7

Processing new gamma production spectra

EGAF : An online library containing gamma production measurements induced by neutron capture ‐Validated by the IAEA ‐Measurements performed at the Budapest facility ‐Measurements performed with a thermal neutron beam ‐No continuum measurements No continuum needed Continuum needed Fe isotopes Ag, In, Cd isotopes Gd isotopes Hf isotopes

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 8

Processing new gamma production spectra

Highlighting of the continuum and discrete gamma production spectrum induced by neutron capture on gadolinium

Measurements performed by Groshev et al. In the 50’s

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 9

Processing new gamma production spectra

11 octobre 2012

TALYS : A modelling nuclear reaction code

  • A common development between CEA/DAM and NRG (Holland)
  • A deterministic solver of the compound nucleus equation
  • 5 strength function models and 4 level density models
  • Account for well-known discrete levels
  • Coupling with the TEFAL code to produce new evaluations at the

ENDF format

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 10

Processing new gamma production spectra

Composite Gilbert-Cameron model Generalized Lorentzian model Advised models by Kopecky-Uhl

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 11

Processing gamma production spectra

1μeV<En<1keV ~ 90% of the radiative capture rate in a PWR Discrete part processed with EGAF measurements If needed, continuum part processed with TALYS (Econt=Sn-EEGAF) En>1keV All the spectrum processed with TALYS Spectrum placed in MF6MT102 in the ENDF format 16 nuclei :

54Fe, 56Fe, 57Fe, 58Fe, 107Ag, 109Ag, 113In, 115In, 113Cd, 155Gd, 57Gd , 174Hf, 177Hf, 178Hf, 179Hf, 180Hf

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 12

Comparison between JEFF and the new evaluations

54Fe APOLLO94_GAMMA mesh High energy gamma production spectrum not described in JEFF3.1.1

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 13

56Fe APOLLO94_GAMMA mesh

Comparison between JEFF and the new evaluations

Better description of the gamma peaks

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 14

177Hf APOLLO94_GAMMA mesh

Comparison between JEFF and the new evaluations

I MeV peaks not accounted for in JEFF3.1.1 High energy primary gamma peak

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 15

180Hf APOLLO94_GAMMA mesh

Comparison between JEFF and the new evaluations

No primary gamma peak in JEFF3.1.1 Better precision of low energy photons

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 16

Effects of the new evaluations

Gamma source created by neutron capture at the center

  • f the sphere

Calculation of the gamma heating in each shells with TRIPOLI4 Comparison between JEFF3.1.1 and the new evaluations Created photons transported Local energy deposition (gamma heating)

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 17

Test of the new evaluations

54Fe d=8.3.10-2 nuclei.cm-1.barn-1

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 18

Test of the new evaluations

56Fe d=8.3.10-2 nuclei.cm-1.barn-1

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 19

Test of the new evaluations

Stainless steel

d=8.3.10-2 nuclei.cm-1.barn-1

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 20

The PERLE experiment

Measurement points Fuel pins and moderator Water channels

  • A stainless steel reflector
  • 9 measurements points of the gamma

heating With JEFF3.1.1, underestimation of the gamma heating in the reflector

  • 7.5 ± 6 % (1σ)

Steel reflector

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 21

Distance from Differences with JEFF3.1.1 the core center [cm] C2/C1-1 [%] 20.9 0.9 23.76 1.3 26.4 1.5 29.01 1.5 31.66 2.3 34.2 2.3 36.8

  • 0.5

The PERLE experiment

The new evaluations allow to decrease the gamma heating calculation bias

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8 juin 2012 WONDER | SEPTEMBER 27th 2012 | PAGE 22

Conclusion and perspectives

Before in JEFF3.1.1 :

  • Bad accuracy of the gamma production spectra
  • Energy inconsistencies

Now :

  • 14 new evaluations proposed for JEFF3.2
  • Accounting for the latest EGAF measurements
  • Improvement of the gamma heating calculation in a stainless steel

reflector Future :

  • Calculation of the gamma heating in Hafnium with the new

evaluations

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8 juin 2012 | PAGE 23 CEA | 10 AVRIL 2012

Direction DEN Département DER Service SPRC Commissariat à l’énergie atomique et aux énergies alternatives Centre de Saclay | 91191 Gif-sur-Yvette Cedex

  • T. +33 (0)1 XX XX XX XX | F. +33 (0)1 XX XX XX XX

Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 019

11 octobre 2012 | PAGE 23 CEA | 10 AVRIL 2012