Expert Group on Assay Data of Spent Nuclear Fuel (EGADSNF) of Working Party on Nuclear Criticality Safety in OECD/NEA Nuclear Science Committee

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Expert Group on Assay Data of Spent Nuclear Fuel
(EGADSNF) of Working Party on Nuclear Criticality
Safety in OECD/NEA Nuclear Science Committee
The 8th International Conference on Nuclear
Criticality Safety, May 28 - June 1, 2007,
St.Petersburg, Russia
K. SuyamaJapan Atomic Energy AgencyY.
RugamaOECD/NEA DatabankM. Brady-RaapPacific
Northwest National Laboratory
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Back Ground(1)

• How we can validate our burnup calculation code
  and method?
• Measured isotopic composition (PIE) data are
  required.
• Difficult to conduct PIE under limited man-power
  and budget condition.
• To share PIE data is useful for future
  activities.
• Development of database SFCOMPO.

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Background(2)

• In may 2006, OECD/NEA sponsored a PIE workshop in
  the Czech republic.
• The general requirements for PIE data for other
  reactor types and applications were also
  discussed and confirmed among the meeting
  participants.

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Background(3)

• At the NEA/NSC/WPNCS meeting at Aix-en-Provence
  on 2006, setting up a subgroup on PIE data was
  proposed and endorsed by the group.
• The recommendation was an expert group under
  WPNCS, instead of subgroup under EGBUC.

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Structure

• Expert group on Assay Data of Spent Nuclear Fuel
  (EGADSNF).
• Date of creation December 2006 (after
  endorsement at the bureau meeting of NSC in
  December 2006).
• Duration two years (December 2008).

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Mandate - 1

• A review of PIE activities and facilities with
  such capabilities in OECD member countries, and
  PIE data in SFCOMPO database operated by OECD/NEA
  in order to understand current situation.

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Mandate - 2

• To collect new isotopic composition data from PIE
  and input them and their associated operating
  histories/data into SFCOMPO.

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Mandate - 3

• To keep and archive original reports of any PIE
  data included in the SFCOMPO database, including
  the addition of data references that were used in
  the original development.

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Mandate - 4

• To provide technical advice in support of PIE
  activities in member countries and to promote
  international collaborations in order to
  compensate for the fact that few PIE data are
  openly available.

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Nomination of members experiments to applications

• WPNCS members.
• Burnup Credit Application.
• Radioactive Waste Management.
• NEA Radioactive Waste Management Committee.
• Integration Group for the Safety Case (IGCS).
• Reactor Safety.
• NEA Nuclear Safety Division.
• Committee on the Safety of Nuclear Installations
  (CSNI).
• Specialists of experiment (PIE for assay data).
• Institute for Trans Uranium (ITU),
  Belgonucleaire, CSK.CEN.

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Deliverables

• Revised SFCOMPO database itself.
• Archive of original report and references.
• New PIE data (if possible).
• Report on PIE.
• State of the art report on PIE (method, error,
  quality of the data).
• To be used if someone conducts PIE in future.

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Meetings

• October 2006 (NEA HQ).
• Kick off meeting.
• 10 participants from 6 countries and one
  international organization.
• April 2007 (NEA HQ).
• 1st meeting (official meeting).
• 13 participants from 6 counties and 2
  international organizations.
• General discussion, allocation of homework.

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Highlight of last meeting

• Well-defined work plan was confirmed.
• PIE is one of the key issues of nuclear
  technology development.
• Long half-life nuclide (required by waste
  management)
• Our report will include
• State of the art of measurement of PIE data
  (techniques, errors).
• Sensitivity analysis (error estimation) of PIE
  data considering missing data in open-document.
• Requirement of PIE data not only BUC but also
  other applications.