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:
ed 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 the first barrier is concrete, procedures used are reviewed on a case-by-case basis. 3.5.3-5 Revision 3 - March 2007 TABLE 1 Minimum Acceptable Barrier Thickness Requirements For Local Damage Prediction Against Tornado Generated Missiles Regions* Concrete Strength MPa (psi) Wall Thickness cm (inches) Roof Thickness cm (inches) Region I 20.7 (3000) 27.6 (4000) 34.5 (5000) 46.2 (18.2) 42.9 (16.9) 40.6 (16.0) 33.5 (13.2) 31.2 (12.3) 29.7 (11.7) Region II 20.7 (3000) 27.6 (4000) 34.5 (5000) 39.1 (15.4) 36.3 (14.3) 34.5 (13.6) 28.4 (11.2) 26.4 (10.4) 25.1 (9.9) Region III 20.7 (3000) 27.6 (4000) 34.5 (5000) 30.2 (11.9) 28.2 (11.1) 26.7 (10.5) 22.1 (8.7) 20.6 (8.1) 19.6 (7.7) * For definition of Regions I, II, and III, refer to RG 1.76 3.5.3-6 Revision 3 - March 2007 2. For Overall Damage Prediction The response of a structure or barrier to missile impact depends largely on the location of impact (e.g., midspan of a slab or near a support), on the dynamic properties of the target and missile, and on the kinetic energy of the missile. In general, the assumption of plastic collisions is acceptable, where all of the missile's initial momentum is transferred to the target and only a portion of its kinetic energy is absorbed as strain energy within the target. However, where elastic impacts are expected, the additional momentum transferred to the target by missile rebound should be considered in the analyses. After it has been demonstrated that the missile will not penetrate the barrier, an equivalent static load concentrated at the impact area should then be determined, from which the structural response, in conjunction with other design loads, can be evaluated using conventional design methods. An acceptable procedure for such an analysis, where the impact is assumed to be