New evaluations of photon production for JEFF3...- JEFF3.1.1, ENDF/B-VII, JENDL4.0 Neutron induced...

8 juin 2012 | PAGE 1CEA | 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 1CEA | 10 AVRIL 2012

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’sthesis

(EPFL 1999)

Importance of the gamma transport in power reactors

Photon heating predominant in water reactor’s vessel

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

Needed improvements for JEFF3.1.1

Energy inconsistencies in JEFF3.1.1 in the gamma production spectrum fromneutron capture

57Fe56Fe

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 capture54Fe,57Fe, 58Fe, Hf

Need to generate new gamma production evaluations

Processing new gamma production spectra

EGAF : An online library containing gamma production measurements inducedby 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

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

Measurementsperformed by

Groshev et al. In the 50’s

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

Composite Gilbert-Cameron model

Generalized Lorentzian model

Advised models by Kopecky-Uhl

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

Comparison between JEFF and the new evaluations

54Fe APOLLO94_GAMMA mesh

High energy gamma production spectrum not described in JEFF3.1.1

56Fe APOLLO94_GAMMA mesh

Better description of the gamma peaks

177Hf APOLLO94_GAMMA mesh

I MeV peaks not accounted for in JEFF3.1.1

High energy primary gamma peak

180Hf APOLLO94_GAMMA mesh

No primary gamma peak in JEFF3.1.1

Better precision of low energyphotons

Effects of the new evaluations

Gamma source created by neutron

capture at the center of 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 energydeposition (gamma

heating)

Test of the new evaluations

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

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

Stainless steeld=8.3.10-2 nuclei.cm-1.barn-1

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

Distance from Differences with JEFF3.1.1the core center [cm] C2/C1-1 [%]

20.9 0.923.76 1.326.4 1.529.01 1.531.66 2.334.2 2.336.8 -0.5

The PERLE experiment

The new evaluations allow to decrease the gamma heating calculation bias

Conclusion and perspectives

Before in JEFF3.1.1 :

- Bad accuracy of the gamma production spectra

- Energy inconsistencies

- 14 new evaluations proposed for JEFF3.2

- Accounting for the latest EGAF measurements

- Improvement of the gamma heating calculation in a stainless steelreflector

Future :

- Calculation of the gamma heating in Hafnium with the new evaluations

8 juin 2012

| PAGE 23

CEA | 10 AVRIL 2012Direction DENDépartement DERService SPRC

Commissariat à l’énergie atomique et aux énergies alternativesCentre de Saclay | 91191 Gif-sur-Yvette CedexT. +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 01911 octobre 2012

| PAGE 23

CEA | 10 AVRIL 2012

New evaluations of photon production for JEFF3...- JEFF3.1.1, ENDF/B-VII, JENDL4.0 Neutron induced...

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