CIELO Project (WPEC-SG40)

IAEA Data Development Project within the
International Pilot Project of the OECD/NEA

IAEA DDP Coordinators: R.Capote and A. Trkov

Overall Objective

The overall objective of the CIELO Pilot Project (OECD/NEA WPEC SG-40) is to test the scheme of broad international collaboration to improve evaluated nuclear data files of the major nuclides: H-1, O-16, Fe-56, U-235, U-238 and Pu-239. The collaboration scheme is similar to that employed in the IAEA CRP on Evaluated Nuclear Data for the Th-U Fuel Cycle, which resulted in a very successful new evaluation of Th-232 and improvements to the evaluations for other relevant nuclides. Production of improved and validated evaluated nuclear data files is the main goal of the project.

IAEA CIELO transport files for U-235, 07 Nov 2017

The high-energy tailof the PFNS of U-235 for thermal neutrons has been restored to the previous shape. The only difference from "beta5" is now a denser energy grid:
U-235 (07Nov2017)
U235 version "z8".

IAEA CIELO transport files for U-235 and U-238, 29 Sep 2017

Two updates for each of U-235 and U-238 are available:
U-235 (29Sep2017)
U235 version "z4" and
U235 version "z5"

Similarly for U-238:
U-238 (29Sep2017)
U238 version "n" and
U238 version "o" and

Versions U235_z4 and U238_n differ from the version of 27 Sep in the covariances of the angular distributions. The new files include covariances of the Legendre terms up to P2, taking into account the correlation with the elastic cross section. This representation is formally more correct and at least the P1 covariance matrix is processable with NJOY2012 and NJOY2016. However, the cross-correlations are omitted, so the uncertainty in the scattering moments will be incorrect.

Versions U235_z5 and U238_o include the new P(nu) data for fission in MF6 and contain full correlations in the Legendre terms up to P2. The P(nu) data are processable with NJOY2016, but the covariances of the angular coefficients are not.

IAEA CIELO transport files for U-238, 27 Sep 2017

An error was found in the prompt-fission gamma spectra of U-238. File assembly was repeated and the files were uploaded with the same names under the links from 26 Sep 2017 below.

IAEA CIELO transport files for U-235 and U-238, 26 Sep 2017

Minor changes to the PFGS data, the PFNS and mu-bar covariances were made. The filenames of U-235 were not changed. The file on the link from 20 September was overwritten. Please, reload. The changes should not affect the U-235 ACE files.

U-235 (26Sep2017) Version: u235ib46o28t6DNcnu5ef0STz3
compressed ENDF file and
compressed ACE file
are updates to the U-235 evaluation. It includes complete covariance matrices of the cross sections, nu-bar, mu-bar, PFNS(thermal) and PFNS(fast). This file is the updated proposal for the the ENDF/B-VIII.0.beta5 evaluation.

U-238 (26Sep2017) Version: u238ib58lrlFsfaST4m
compressed ENDF file and
compressed ACE file
are updates to the U-238 evaluation. It includes complete covariance matrices of the cross sections, nu-bar, mu-bar, PFNS(fast) and PFNS(high_energy). This file is the updated proposal for the the ENDF/B-VIII.0.beta5 evaluation.

IAEA CIELO transport files for U-235 and U-238 with covariances, 20 Sep 2017

U-235 (20Sep2017) Version: u235ib46o28t6DNcnu5ef0STz3
compressed ENDF file and
compressed ACE file
are updates to the U-235 evaluation. It includes complete covariance matrices of the cross sections and nu-bar. This file is the proposal for the ENDF/B-VIII.0.beta5 evaluation.

U-238 (20Sep2017) Version: u238ib58lrlFsfaST4l
compressed ENDF file and
compressed ACE file
are updates to the U-238 evaluation. It includes complete covariance matrices of the cross sections and nu-bar. This file is the proposal for the ENDF/B-VIII.0.beta5 evaluation.

IAEA CIELO iron files (in collaboration with BNL-NNDC)

Fe-56 (26FEB) Version: fe56ib20w compressed ENDF file and compressed ACE file
Fe-minor isotopes (28FEB) Version: e80b4 compressed ENDF files and compressed ACE files

Transport files including Neutron Standard reactions

B-10 (01MAR) Version: 10B_ENDF-VIII_b4 (as received from G. Hale on 1 March), consistent with STD2017
Au-197 (01MAR) Version: n-079_Au_197_STD17_ENDF (as received from A. Trkov on 1 March), consistent with STD2017
Li-6 (07FEB) Version: 6Li_ENDF-VIII_b4 (as received from G. Hale on 8 February), consistent with STD2017
H-1 (27JAN) Version: h1hale17 (as received from G. Hale on 26 January), consistent with STD2017 (comments need update)

Update to LANL Pu-239 (17-22) February 2017

Pu-239 was evaluated by Los Alamos National Laboratory, and is provided for convenience of validation. The file was made consistent with Standards_2017 above the resonance region. PFNS were missing for Einc = 17.5, 20 and 30 MeV in the file submitted on February 17.

Pu-239 Version: pu239e80b4_5_corDN (as submitted by D. Neudecker on 22 February) compressed ENDF file

Update to IAEA-CIELO as of 15 February 2017

The Standards were modified slightly (final release Standards 2017, February) and they affected benchmark performance. The U-238(n,f) cross section below the Standards region was defined on a finer mesh, so it was decided to adopt it (previously the ENDF/B-VI.8 was taken). The cross sections were made consistent with the new Standards in the "Standards" region, as well as in the region of "recommended" cross sections (pointwise or group-wise). This meant that U-235 and U-238 evaluations needed additional tuning. Small changes to nu-bar were made. The new PFNS of U-235 by D. Neudecker are included, as well as the fission gamma data from Stetcu (LANL).

Files available for downloading:
U-235 Version: u235_CIELO20170215 compressed ENDF file (internal IAEA designation u235ib36o28t6DNcnu5ef0STs), SUPERSEDED
U-238 Version: u238_CIELO20170215 compressed ENDF file (internal IAEA designation u238ib54lrlFsfaST4d)

Update to IAEA-CIELO as of 27 January 2017

Since the November release of the updated IAEA-CIELO files the Standards_2016 were finalised. These Standards were incorporated into the updated evaluations for the major uranium isotopes. A few additional small changes for U-235(n,f) and U-238(n,f) outside the standard region were deemed necessary.

Files are available for downloading: