Document: NUREG-0800
Document ID: 362175ab-e7ce-488e-8515-4d4b3de493c7
Document Type: srp
Title: MISSILES GENERATED BY EXTREME WINDS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1304/ML13043A004.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4
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Content:
e of10 CFR 52.47(a)(8), (21), and (22), respectively to applicants for COLs. These cross-cutting review areas should be addressed by the reviewer for each technical subsection and relevant conclusions documented in the corresponding Safety Evaluation Report (SER) section. 1. SRP Sections 3.5.2 and 19.3 provide guidance on the identification of all “SSCs subject to missile (externally-generated) protection.” 2. The SAR is reviewed for the identification of the design-basis natural phenomena that could possibly generate missiles. Postulated missiles are reviewed for proper characterization. 4. RG 1.76 provides guidance on the definition and characterization of the design-basis tornado as discussed in Subsection II. 5. RG 1.221 provides guidance on the definition and characterization of the design-basis hurricane as discussed in Subsection II. 6. The design-basis natural phenomena for the site are reviewed with respect to the potential for missile generation. For phenomena with greater potential for missile generation than the design-basis tornado or hurricane (i.e., initiating frequency is 10-7 per year or greater), appropriate design-basis missiles are proposed. 7. All plants are required to be designed to protect safety-related equipment against damage from missiles which might be generated by extreme winds for that plant. The wind and missile loadings derived from the extreme wind characteristics for the site form part of the facility design basis. The reviewer verifies that the applicant has postulated missiles that include at least (1) a massive high-kinetic-energy missile that deforms on impact, (2) a rigid missile to test penetration resistance, and (3) a small rigid missile of a size sufficient to just pass through any openings in protective barriers. Acceptable missiles and their associated speeds are identified in Table 2 of RG 1.76, and Tables 1 and 2 of RG 1.221. 8. For review of a DC application, the reviewer should follow the above procedures to