Abstract

 Preview

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 

  • Status
     :  Published
    Publication date
     : 2011-07
  • Edition
     : 1
    Number of pages
     : 13
  • Technical Committee
     : ISO/TC 85/SC 5 Nuclear installations, processes and technologies
  • ICS
     :
    27.120.30 Fissile materials and nuclear fuel technology

Buy this standard

Format Language
PDF
Paper
  • CHF92

Life cycle


Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)

Keep up to date with ISO

Sign up to our newsletter for the latest news, views and product information.

  2. Store
  3. Standards catalogue
  4. TC
  5. ISO/TC 85/SC 5
  6. ISO 11311:2011