Document: NUREG-0800
Document ID: 339b5072-d5b1-47d7-9002-e7b942ab753b
Document Type: srp
Title: II.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070311.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.3.8
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CFR Title: 

Content:
f 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 21 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 included considered in the analyses.22 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 plastic, is presented in a paper by Williamson and Alvy (Ref. 6 7 ). Other procedures may be used, provided the results obtained are comparable to 23 those referenced above. DRAFT Rev. 2 - April 1996 3.5.3-4 Maximum allowable ductility ratios for steel and reinforced concrete barriers and other structural elements if used, in the above analysis, are given in Appendix A to this SRP 24 section. Technical Rationale The technical rationale for application of acceptance criteria regarding the provision and design of barriers is discussed in the following paragraphs:25 1. Compliance with GDC 2, "Design Bases for Protection Against Natural Phenomena," requires that structures, systems, and components important to safety be designed to withstand (or be protected against) the effects of natural phenomena without loss of capability to perform their safety functions. The design bases for such structures, systems, and components must include considering the effects of accident conditions, plus the importance of the safety function to be performed and the effects of natural phenomena. The staff's criteria