Reference number
ISO 11311:2011
International Standard
ISO 11311:2011
Nuclear criticality safety — Critical values for homogeneous plutonium-uranium oxide fuel mixtures outside of reactors
Edition 1
2011-07
Read sample
ISO 11311:2011
50381
Published (Edition 1, 2011)
This publication was last reviewed and confirmed in 2024. Therefore this version remains current.
This standard has 1 amendment.

ISO 11311:2011

ISO 11311:2011
50381
Language
Format
CHF 96
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Abstract

ISO 11311:2011 specifies common reference critical values (of which the effective neutron multiplication factor, keff, is equal to 1) for homogeneous water-moderated plutonium-uranium oxide mixtures based on an inter-code comparison of calculated critical values.

It is applicable to operations with unirradiated mixed uranium-plutonium oxide (MOX) outside nuclear reactors.

A classical validation approach for these systems is difficult because of the paucity of critical experiments for MOX fuel.

Various reference systems, in terms of isotopic compositions, thicknesses of water reflection, and densities of oxide are evaluated by different combinations of calculation codes and nuclear data libraries (i.e. different calculation schemes).

The critical values defined in ISO 11311:2011 are the lowest of those calculated by each of these calculation schemes and accepted as credible.

The values in ISO 11311:2011 are reference values and not absolute critical values.

General information

  •  : Published
     : 2011-07
    : International Standard confirmed [90.93]
  •  : 1
     : 13
  • ISO/TC 85/SC 5
    27.120.30 
  • RSS updates

 Amendments

Amendments are issued when it is found that new material may need to be added to an existing standardization document. They may also include editorial or technical corrections to be applied to the existing document.

Amendment 1

Corrections and clarifications

Edition 2022

ISO 11311:2011/Amd 1:2022
83064
Language
Format
CHF 18
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Life cycle

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