Document: NUREG-0800
Document ID: a0bd8078-b077-48b3-83a2-5710c3303535
Document Type: srp
Title: BARRIER DESIGN PROCEDURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340544.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.3
CFR Part: 
CFR Title: 

Content:
t. Several empirical equations, such as the modified NDRC-formula (Ref. 3) are available to estimate missile penetration into concrete. These equations should be used to determine the required barrier thicknesses. Thicknesses resulting from such calculations should in no case be less than those listed in Table 1, which thicknesses are necessary to protect against tornado missiles. The tornado missile spectrum for which Table 1 concrete requirements are adequate is shown in Table 2. Tornado missiles and other types of missiles are specified in accordance with SRP Section 3.5.1. Barrier thicknesses less than those listed in Table 1 may be used provided that sufficient justification including test data are presented to support them, in which case they will be reviewed on a case-by-case basis. For turbine missile barriers, penetration and scabbing predictions should be based on empirical equations such as the modified NDRC formula (Ref. 3) or the results of a valid test program. b. In Steel The results of test conducted by the Stanford Research Institute on the penetration of missiles into steel plates are summarized by W. B. Cottrell and A. W. Savolainen in "U. S. Reactor Containment Technology" (Ref. 4). The equations presented in Reference 4 are acceptable. Other equations such as the Ballistic Research Laboratory formula described in Reference 5 may be used provided the results are either comparable to those referenced above, or are validated by penetration tests. 3.5.3-2 Rev. 1 - July 1981 c. In Composite Sections For composite or multi-element missile barriers, procedures for prediction of local damage are acceptable if the residual velocity of the missile perforating the first element is considered as the striking velocity for the next element. For determining this residual velocity, the equations presented by Recht and Ipson (Ref. 6) are acceptable when the first barrier of a multi-element missile barrier is steel. When the first barrier is concrete, procedures