Document: NUREG-0800
Document ID: 18121933-6a1c-4874-965a-df10cae074e9
Document Type: srp
Title: NEW FUEL STORAGE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070502.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.1.1
CFR Part: 
CFR Title: 

Content:
by the design. The SARs for recent light-water reactor applications have stated that the storage space provided is consistent with the number of new fuel assemblies used during the refueling cycle. In general,Usually, storage capacity for approximately one-third of a core is usually 44 provided for each unit of a plant (e.g., 1/3 core for single unit design and 2/3 core for a dual unit design). 2. The information provided in the SAR pertaining to criticality safety of the new fuel storage facility is evaluated by CPBSRXB upon request. The facility design criteria, 45 safety evaluation, system description, and the layout drawings for the storage vault and racks are reviewed to verify that: a. Criticality information (including the associated assumptions and input parameters) in the SAR must show that the 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, (e.g., high-pressure water spray) in a subcritical condition, i.e., K(eff) of less than about 0.95. 46 Furthermore, the design of the new fuel storage racks will be such that the K(eff) 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 accumulation of a fluid moderator. 47 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 assureensure that they will not cause an increase in K(eff) beyond the 48 maximum allowable. The SAR description section, the general arrangement and layout drawings, and the tabulation of seismic design classifications