Document: NUREG-0800
Document ID: fe01f58a-7d3d-4b25-9150-cae77bf828ca
Document Type: srp
Title: BARRIER DESIGN PROCEDURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570004.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.3
CFR Part: 
CFR Title: 

Content:
eptable Barrier Thickness Requirements, provides minimum concrete barrier thickness requirements for preventing local damage against tornado generated missiles for tornado spectrum shown in Table 2 of Regulatory Guide (RG) 1.76. Barrier thicknesses less than those listed in Table 1 may be used, provided that sufficient justification (including test data) is presented to support them. These justification will be reviewed on a case-by-case basis. Other types of missiles are specified in SRP Sections 3.5.1.1 through 3.5.1.6. For turbine missile barriers, penetration and scabbing predictions should be based on empirical equations such as the modified NDRC formula or the results of a valid test program. B. Steel The results of tests conducted by the Stanford Research Institute (SRI) on the penetration of missiles into steel plates are summarized in “U.S. Reactor Containment Technology” (ORNL/NSIC-5, Vol.1, Chapter 6, Oak Ridge National Laboratory, 1965) by W.B. Cottrell and A.W. Savolainen. The equations presented in aforementioned document are acceptable. Other equations such as the Ballistic Research Laboratory formula described in, “Reactor Safeguards,” by C. R. Russell, published by MacMillan, New York, 1962, may be used, provided the results are either comparable to those obtained by using the aforementioned “U.S. Reactor Containment Technology” method or are validated by penetration tests. C. Composite Sections For composite or multi-element 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 in “Ballistic Perforation Dynamics,” Journal of Applied Mechanics, Transactions of the ASME, Vol. 30, Series E, No. 3, September 1963 by R. F. Recht and T. W. Ipson, are acceptable when the first barrier of a multi-element missile barrier is steel. When