Document: NUREG-0800
Document ID: e957a666-60d9-4eb2-86e5-0f19965803d6
Document Type: srp
Title: MISSILES GENERATED BY EXTREME WINDS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14190A180.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4
CFR Part: 
CFR Title: 

Content:
es proposed for its facility and the SRP acceptance criteria and evaluate how the proposed alternatives to the SRP acceptance criteria provide acceptable methods of compliance with NRC regulations. 1. Regulatory Guide (RG) 1.76, “Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants,” describes acceptable design-basis tornado-generated missile spectra for the design of nuclear power plants. 2. RG 1.221, “Design-Basis Hurricane and Hurricane Missiles for Nuclear Power Plants,” describes acceptable design-basis hurricane-generated missile spectra for the design of nuclear power plants. 3. The method of identifying appropriate design-basis missiles generated by natural phenomena should be consistent with the acceptance criteria defined for the evaluation of potential accidents from external sources in SRP Section 2.2.3, “Evaluation of Potential Accidents.” A licensee or applicant may justify the acceptability of the use of another methodology. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 2 establishes requirements regarding the ability of SSCs important to safety to withstand the effects of natural phenomena without the loss of capability to perform their safety functions. Protection from the missile spectrum set forth in RG 1.76 and RG 1.221 provides assurance that necessary SSCs will be available to perform their safety functions during and following an extreme wind event. 2. GDC 4 establishes requirements regarding the ability of SSCs important to safety to be protected from dynamic effects, including the effects of missiles, from events and conditions outside the nuclear unit. Protection from a spectrum of missiles with the critical characteristics set forth in RG 1.76 and RG 1.221 provides assurance that the necessary SSCs will be available to mitigate the potential effects of extreme winds and