Proposal for the General Purpose Neutron Library JEFF-3.2

1
Proposal for the General Purpose Neutron Library
JEFF-3.2

• Arjan Koning
• NRG Petten, The Netherlands
• JEFF Meeting
• June 3-5 2009, Manchester
• JEF/DOC-1280

2
Contents

• Introduction
• Selection criteria
• Specific new data files
• Points of discussion/attention
• The list

3
(No Transcript)
4
JEFF-3.1 May 2005
5
Introduction

• JEFF-3.1 released in May 2005.
• Modified version JEFF-3.1.1 (2008) validated for
  industrial use in and by France (changes in
  Np-237, Pu-239, 7 FPs a few minor changes).
• Last versions adopted by European nuclear
  industry JEF-2.2 (1992) and JEFF-3.1.1 (2008)
• Next release JEFF-3.2, expected in 2010
• Reason to change first number an entirely
  different philosophy
• Reason to change first decimal (usually) upgrade
  of the major actinides

6
Selection criteria for JEFF-3.2

• For each nuclide, select the best evaluation in
  the world, keeping in mind the most important
  application of that nuclide.
• Best evaluation
• Proven success in applications
• Date of the evaluation
• Quality of underlying physics (exp. and theor.)
• Completeness (energy range, ang. dis., gammas,
  spectra, covariances, etc.)
• Available sources
• New evaluations, JEFF-3.1(.1), ENDF/B-VII,
  JENDL-3.3, EFF, BROND-2.2, CENDL-2.1, TENDL-2008

7
Selection criteria (cookbook)

• Include new European evaluations produced since
  JEFF-3.1
• Default upgrade take newer versions of
  previously adopted libraries. If e.g. ENDF/B-VI.8
  was taken for a JEFF-3.1 nuclide, take ENDF/B-VII
  now.
• However, choose other evaluations if there are
  reasons to do so (overrule the action mentioned
  above).
• Adopt isotopes from other libraries if they do
  not exist at all in JEFF. (7 from ENDFB/-VII)
• Use TENDL-2008 (or TENDL-2009) for isotopes for
  which no evaluation exists and to replace very
  old evaluations.

8
Specific new data files for JEFF-3.2

• New U235,236,237,238, Pu-239,240 files underway
  (CEA)
• New Am-241 evaluation from NUDATRA project (CEA)
• Th-232, Pa-233 from IAEA project
• Pb and Bi isotopes from NUDATRA project. (NRG)
• Na-22,23, if ready on time (NRG)
• EFF project All isotopes of Cr, Mn, Ta and W
  (FZK,IAEA)
• Np-237 (CEA?)
• Adopted from ENDF/B-VII
• Sn-113, Xe-123, Ho-166m, U-239,240,241,
  Cf-253
• TENDL-2008 evaluations for 72 nuclides When no
  evaluations exists (all Ne, Tm, Yb isotopes),
  long-lived nuclides or to replace old natural
  evaluations (Zn, Os, Pt and Tl). Includes
  complete covariance information. (NRG)

9
Points of discussion/attention

• Many evaluations in the range from As (Z33) to
  Er (Z65) are very old and date back from JEF-2.2
  or ENDF/B-V. Reason they are fission products
  and some of them are known to perform well in
  validation. However, for other use they are
  unsuitable or at most of insufficient quality.
  Can we adopt modern files for all of them and
  re-adjust the important FP data?
• When updating actinide evaluations, make sure to
  include 8 time groups for delayed neutrons.
• Adopt ENDF/B-VII filename policy
  n-058-Ce-142-jeff32.0 may be more attractive than
  JEFF31N5843_0.ASC
• Make a script that creates JEFF-3.2 from other
  sources and change the script when the JEFF
  community makes changes.

10
(No Transcript)
11
The list

• Proposal for JEFF-3.2
• 463 materials (461 isotopes and 2 elements)
• See separate document