Document: NUREG-0800
Document ID: 67dddfbb-43f1-4ea2-995b-b50e228f419f
Document Type: srp
Title: NEW FUEL STORAGE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350536.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.1.1
CFR Part: 
CFR Title: 

Content:
spacing between fuel assemblies in the storage racks is sufficient to maintain the array, when fully loaded and flooded with potential moderators such as nonborated water fire extinguishant aerosols, in a subcritical I condition, i.e., Keff of less than about 0.95. Furthermore, the design of the new fuel storage racks will be such that the Keff will not exceed 0.98 with fuel of the highest anticipated reactivity in place assuming optimum moderation. Credit may be taken for neutron absorbing materials. b. The design is such that a fuel assembly cannot be inserted anywhere in the racks other than in the design locations and provisions have been made for drainage of the vault design, to prevent the accumula- tion of a fluid moderator. c. Failures of nonsafety-related systems or structures not designed to seismic Category I criteria that are located in the vicinity of the new fuel storage facility are reviewed to assure that they will not cause an increase in Keff beyond the maximum allowable. The SAR description section, the general arrangement and layout drawings, and the tabulation of seismic design classifications for structures and systems are reviewed and evaluated to assure that this condition is met. A statement in the SAR establishing the above condition as a design criterion is acceptable at the CP review stage. d. Design calculations should show that the storage racks and the anchorages can withstand the maximum uplift forces available from the lifting devices without an increase in. Keff. A statement in the SAR that excessive forces cannot be applied due to the design of the lifting devices is acceptable if justification is presented. The evaluation procedures identified in SRP Section 9.1.4 are used to validate this statement. e. The vault and racks have been designed to preclude damage from dropped heavy objects. f. Sharing of a storage facility in multi-unit plants does not result in any added potential for increasing the Keff of the storage array. 3.