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ISO 11311:2011

Current Revision

Nuclear criticality safety - Critical values for homogeneous plutonium-uranium oxide fuel mixtures outside of reactors

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 11311
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 85/SC 5
Publish Date Document Id Type View
Not Available ISO 11311:2011 Revision