Document: NUREG-0800
Document ID: a41f4aae-e975-45f3-aebc-5519bec72c6e
Document Type: srp
Title: CRITICALITY SAFETY OF FRESH AND SPENT FUEL STORAGE AND HANDLING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570006.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.1.1
CFR Part: 
CFR Title: 

Content:
modeled correctly and that all modeling approximations and assumptions are appropriate. The abnormal-conditions computational models should be described. Such descriptions should include, but are not limited to, modeling assumptions and 9.1.1-9 Revision 3 - March 2007 approximations, handling of dimensional and material tolerances and uncertainties, omitted materials, selection of computer code input options affecting the results, and sensitivity studies performed to support abnormal- conditions model development. The reviewer verifies that abnormal-conditions models conservatively simulate the actual abnormal conditions and that all assumptions and approximations are appropriate. Where possible, detailed three-dimensional models should be used for criticality analysis. I. The reviewer evaluates the analysis of normal and credible abnormal conditions to verify that the analysis is complete and logically sound and that assumptions, limits, and controls are clearly stated. The criticality analysis should present a comprehensive analysis of the subcriticality of the normal and credible abnormal conditions. The analysis should clearly identify all assumptions, limits, and controls credited in the analysis. The reviewer should verify that the analysis of the normal and credible abnormal conditions is complete and logically sound. The reviewer should verify that assumptions are appropriate, that preference was given to geometrically safe controls in ensuring subcriticality, and that limits and controls are appropriate and can be effectively implemented. J. The reviewer evaluates the analysis conclusions to verify the applicant’s conclusions regarding maintaining subcriticality for all normal and credible abnormal conditions. The criticality analysis should conclude that the fuel will remain subcritical under all normal and credible abnormal conditions. The reviewer should review and concur with the conclusions of the analysis. 3. As required in 10 CFR 50.68, one of the