MEPH: IRSN Mephista Nuclear Fuels Database Revision History

Current Database Version

Database name (acronym):

IRSN Mephista-20 Nuclear Fuels Database (MEPH20)

Database owner:

IRSN

Database version:

20

Changes in the Most Recent Database Release

Software release version: 2022b (June 2022)

  • Added element Cr

  • Added 14 binary systems related to the addition of Cr.

    All X-Cr (with X=Ba, C, Ce, Cs, Fe, La, Mo, O, Pu, Ru, U, Si, Sr, Zr) are modeled.

  • Added 6 fully modeled ternary systems related to the addition of Cr.

    Cr-Fe-O, Cr-Fe-Zr, C-Cr-Fe, Ce-Cr-O, Cr-Mo-O, and Cr-O-Zr.

For the following 5 ternary systems where there is not enough experimental data, only pseudo-binary sections are modeled:

  • Ba-Cr-O modeled as BaO − Cr2O3
  • Cr-La-O modeled as Cr2O3 − La2O
  • Cr-O-Si modeled as CrO − SiO2 and Cr2O3-SiO2
  • Cr-O-Sr modeled as Cr2O3 − SrO
  • Cr-O-U modeled as Cr2O3 − UO2

Previous Releases

  • Cr-Ru and Fe-Ru: The lattice-stability of Ru(BCC_A2) available in the Unary 5.0 SGTE database taken into account
  • Fe-Si: Y. Yuan et al. Calphad, 44:54–61, 2014.
  • Fe-U: The lattice-stabilities of Fe(ORT_A20) and Fe(TET) available in the Unary 5.0 SGTE database taken into account
  • La-U: Improvement of liquid thermodynamic properties
  • La-Zr: N. Mattern et al. Calphad, 52:8–20, 2016.
  • Ru-U: The lattice-stability of Ru(BCC_A2) and U(hcp_A3) available in the Unary 5.0 SGTE database taken into account. The Ru3U compound is now modeled as a solution phase, CxRU3U1(SS).
  • Si-Sr: Li et al., Calphad, 35(4):594–600, 2011.
  • Si-Zr: Revised to suppress the appearance of a miscibility gap at the liquid state.
  • U-Zr: The lattice-stability of U(hcp_A3) available in the Unary 5.0 SGTE database taken into account. Improvement of the modeling of liquid and DELTA_UZr2 thermodynamic properties
  • Ba-O-Si BaO-SiO2: Additional compound in the BaO-rich part, BA3O5SI1(S).
  • La-O-U La2O3-UO2: Improvement of the oxygen potential above the solid solution FCC_C1.
  • La-O-Si La2O3-SiO2: Improvement of the thermodynamic properties of La2Si2O7
  • O-Si-Sr SiO2-SrO: Improvement with consideration of new experimental data.
  • O-Si-Zr SiO2-ZrO2: Improvement of the description of the ZrSiO4 compound (thermodynamic properties and decomposition temperature)
  • C-O-Zr: Improvement with consideration of new experimental data.
  • Reassessment of the Fe-O-U, Fe-O-Zr, and O-U-Zr systems

IRSN Mephista Nuclear Fuels Database (MEPH15_1)

Software release version: 2017a (March 2017)

The description of some binary systems are improved:

  • C-Pu: improved modeling of the liquidus.
  • C-U: C3U2(S) made unstable at low temperature.
  • O-Pu: melting temperature of O2Pu1(S) increased and the improved modeling of LIQUID.

The description of the following ternary systems are re-assessed by taking into account the previous

improvements:

  • Ce-O-Pu: revised modeling of CeO2-PuO2 and Ce2O3-PuO2.
  • Fe-O-Pu: revised modeling of FeO-PuO2 and Fe2O3-PuO2.
  • La-O-Pu: revised modeling of La2O3-PuO2.
  • Mo-O -Pu: revised modeling of MoO3-PuO2.
  • O-Pu -Si: revised modeling of SiO2-PuO2.
  • O-Pu-Sr: revised modeling of SrO-PuO2.
  • O-Pu-Zr: revised modeling of PuO2-ZrO2.
  • C-O-Pu: revised modeling of the full system.

The description of some ternary systems are improved:

  • O-Pu-U: improved modeling of PuO2-UO2; improved modeling of the FCC_C1 miscibility gap.
  • Ba-O-Pu: improved modeling of BaO-PuO2.
  • Ba-Mo-O: improved modeling of Ba1Mo1O4 (G).
  • C-Pu-U: improved modeling of the full system.