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:
the criticality analyses. E. When credit is taken for neutron absorbing material, its compatibility and chemical stability in the components wetted by water in the spent fuel pool and in the new fuel vault should be evaluated. The neutron absorbing components typically consist of plates or rods that contain a neutron absorbing element(s) which may, or may not, be dispersed in another composite material. The absorbing materials are usually attached to the rack in plate form, used as cylindrical rod inserts in assembly guide and instrument tube locations, or may be an integral part of the rack structure. During a prolonged exposure to the pool's water, the neutron absorbing material may degrade and release the neutron poison, resulting in some reduction of neutron absorbing properties of the components. The degree of degradation is measured by neutron transmittal methods such as blackness testing or by chemical means. F. The designs are such that a fuel assembly can only be inserted in the designed locations in the fresh and spent fuel racks. G. Sharing of a storage facility in multiunit plants does not result in any added potential for increasing the K(eff) of the fresh and spent fuel storage arrays. 2. Subsection I of this SRP section includes a list of areas of review. The reviewer verifies the following for these areas of review: A. The reviewer verifies that the criticality safety analysis used the appropriate fuel design data. Fuel design data—including materials, dimensional data, uranium loading, and maximum 235U enrichment—should be provided for all fuel design types that may be stored in the fuel storage racks. The reviewer verifies that the information is complete and that the criticality analysis conservatively considers all fuel design types to be handled 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,