Methods and issues for the combined use of integral experiments and covariance data

WPEC Subgroup 33 (SG33) - Final Publication

Information on this web page is for exclusive use by participants in the subgroup activities. The data from this web page should not be quoted or used without the explicit consent of the contributing author.

• SG33 proposal by M. Salvatores and R.D. McKnight, WPEC meeting, June 2008
• SG33 mailing list for questions, comments or to consult archives

• Meetings
• Benchmark exercise on adjustment methods
• Publications and documents
• Related links

This WPEC subgroup was established to study methods and issues of the combined use of integral experiments and covariance data, with the objective of recommending a set of best and consistent practices in order to improve evaluated nuclear data files. Indication should be provided on how to best exploit existing integral experiments, define new ones if needed, provide trends and feedback to nuclear data evaluators and measurers.

Meetings

1. Port Jefferson, USA, 24 June 2009 (summary record)
2. NEA, Issy-les-Moulineaux, France, 24 November 2009 (summary record)
3. NEA, Issy-les-Moulineaux, France, 2 June 2010 (summary record)
4. NEA, Issy-les-Moulineaux, France, 29-30 November 2010 (summary record)
5. NEA, Issy-les-Moulineaux, France, 11 May 2011 (summary record)
6. NEA, Issy-les-Moulineaux, France, 1-2 December 2011 (summary record)
7. NEA, Issy-les-Moulineaux, France, 22-23 May 2012 (summary record)
8. NEA, Issy-les-Moulineaux, France, 29-30 November 2012 (summary record)
9. NEA, Issy-les-Moulineaux, France, 22 May 2013 (summary record)

Benchmark exercise on adjustment methods

Specifications

• Benchmark description
• Adopted 33 group energy structure
• Input/output format and sample files

Integral data

Determination of covariance data for integral parameters, M. Ishikawa
Calculation of isotope/reaction contributions to integral data uncertainty

Benchmark experiments

• Clarifications about corrective factors
• Procedure to generate the 33 group cross sections for corrective factor evaluation

• Jezebel (²³⁹Pu configuration) simplified model and corrective factors (INL)
• Jezebel (²⁴⁰Pu configuration) simplified model and corrective factors (INL)
• Flattop (²³⁹Pu configuration) simplified model and corrective factors (INL)
• ZPR6-7 (standard configuration) simplified model and corrective factors (INL)
• ZPR6-7 (High ²⁴⁰Pu content) simplified model and corrective factors (INL)
• ZPPR9 simplified model and JENDL-based corrective factors plus βeff data (JAEA)
  see also ENDF/B-based corrective factors for ZPPR9 (ANL-INL)
• Joyo simplified model and JENDL-based corrective factors (JAEA)
  see also ENDF/B-based corrective factors for Joyo (INL)

Target systems

• ABR Core: comments and simplified RZ models (ANL)
• FBR Core: comments and simplified RZ models (JAEA)

Additional benchmark experiments for "stress" tests [with ICSBEP Handbook reference]

• ZPR-9/34 - U/Fe assembly with SS reflector [HEU-MET-INTER-001]
• ZPR-3/53 - Pu/C/SS assembly with U blanket [MIX-MET-INTER-004]
• ZPR-3/54 - Pu/C/SS assembly with Fe reflector [MIX-MET-INTER-003]
• ZPR-6/10 - Pu/C/SS assembly with SS/Fe reflectors [PU-MET-INTER-002]

Publications and documents

ND2013 contribution (Draft - August 8, 2013)

• Methods and Issues for the Combined Use of Integral Experiments and Covariance Data: Results of a NEA International Collaborative Study - PDF file - Latex archive.

Final report of SG33

• Methods and Issues for the Combined Use of Integral Experiments and Covariance Data.
• Appendix G - Detailed benchmark results

Adjustment methodology

• Intermediate report on the Assessment of Existing Nuclear Data Adjustment Methodologies

Other documents

• Bibliography relative to Sensitivity and Uncertainty (S/U) Analysis
• Recent Application of Nuclear Data to Fast Reactor Core Analysis and Design in Japan, M. Ishikawa
• Mandate for an NSC Expert Group on Integral Experiments for Minor Actinide Management

Related links

• WPEC Subgroup 39 (follow-up activities)
• ICSBEP, International Criticality Safety Benchmark Evaluation Project (see CPS abstract of ICSBEP Handbook)
• IRPhEP, International Reactor Physics Experiment Evaluation Project (see CPS abstract of IRPhEP Handbook)
• Expert Group on Integral Experiments for Minor Actinide Management
• WPNCS Expert Group on Uncertainty Analyses for Criticalify Safety Assessment
• WPRS Expert Group on Uncertainty Analysis in Modelling

Co-ordinators: G. Palmiotti, M. Salvatores
NEA contact: ( )

Last update: 18 December 2013