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:
ed or stored. B. The reviewer evaluates the fuel storage rack design to verify that appropriate fuel storage rack data were used. Fuel storage rack design data—including materials, dimensional data, spacing between storage racks, materials and dimensions of, and distance to, structures near racks, such as floors and walls, that may provide neutron reflection—should be provided for fresh and spent fuel storage facilities. The reviewer verifies that the data are complete and that the criticality analysis conservatively incorporates fuel storage rack design data. C. The reviewer evaluates the computational methods and related data employed to verify that acceptable computational methods and data were used. The computational methods used for the criticality analysis should be described in detail, including the computer codes and nuclear data used. The reviewer verifies that the description is complete and that the methods used are acceptable. D. The reviewer evaluates the computational method validation to verify that the validation study is thorough and uses benchmark critical experiments that are similar to the normal-conditions and credible abnormal-conditions models and to confirm that the K(eff) bias and bias uncertainty values are properly determined. 9.1.1-7 Revision 3 - March 2007 A detailed description of the validation study supporting the criticality analysis should be provided. Typically, the validation study involves modeling critical experiments that are similar to one or more of the criticality analysis cases. The critical experiments should be similar to the criticality analysis cases to ensure that it is appropriate to apply the bias and bias uncertainty, calculated from the critical experiments, to the criticality analysis cases. The statistical analysis method used to determine the maximum K(eff) values should be described in sufficient detail to permit verification that the method is appropriate and performed correctly. The validation study