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OECD Papers provides access to a collection of substantive papers not published as books or articles in other OECD series or journals. All subjects are covered, from the latest OECD research on macroeconomics and economic policies, to work in areas as varied as employment, education, environment, trade, science and technology, development and taxation. OECD Papers are available on a subscription basis. Now a part of the OECD Journal

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Volume 6, Issue 9 You do not have access to this content

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  25 Oct 2006
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Covariance Matrix Evaluation and Processing in the Resolved/Unresolved Resonance Regions

This document serves as a summary of the work of Subgroup 20 (SG20) on covariance matrix evaluation and processing in the resolved/unresolved resonance regions, organised under the auspices of the Nuclear Energy Agency’s Nuclear Science Committee Working Party on International Evaluation Co-operation (WPEC). The work described in this report focuses on:
- summarising the issues related to covariance evaluation in the resonance region;
- discussing the retroactive method used in the SAMMY code [1];
- describing the compact format for storing huge covariance matrices in ENDF-6 files;
- recent developments and upgrades of processing codes to generate a multi-group covariance matrix from resonance parameter covariance data.

  25 Oct 2006
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Very High Burn-ups in Light Water Reactors
This study resulted from a discussion at the June 2002 meeting of the OECD/NEA Nuclear Science Committee, at which it was first suggested to set up a project to address very high burn-ups (specifically average discharge burn-ups in the range 60-100 GWd/t). The outcome was the setting-up in 2003 of the Expert Group on Very High Burn-ups in LWRs, which was charged with the single task of delivering a state-of-the-art report on high burn-ups in LWRs. It was felt that the report should concentrate on LWRs because that is where the bulk of experience and knowledge resides, but much of the analysis will also be applicable to other reactor types, even if not all the details are transferable.
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