Document: NUREG-0800
Document ID: 2b4d3a5f-8e25-4c13-a035-954d864e0c14
Document Type: srp
Title: MISSILES GENERATED BY NATURAL PHENOMENA
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340526.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.4
CFR Part: 
CFR Title: 

Content:
siles may be assumed to be an 1800 Kg automobile, a 125. Kg 8".armor piercing artillery shell, and a 1" solid steel sphere, all impacting at 35% of the maximum horizontal windspeed of the design basis tornado. The first two missiles are assumed to impact at normal incidence, the last to impinge upon barrier openings in the most damaging directions. These missiles are identified as Spectrum I. Alternately, the missiles selected by the National Bureau of Standards as representative of construction site debris in report NBSIR 76-1050 may be 3.5.1.4-2 Rev. 2 .- July 1981 used. These are identified as Spectrum II missiles. Tornado regions are defined in WASH-1300. SPECTRUM II Velocity (m/sec) MISSILE Mass (Kg) Dimensions (m) Region I Region II Region III A Wood Plank 52 .092 x .289 x 3.66 83 70 58 B 6" Sch 40 pipe 130 .168 D X 4.58 52 42 10 C 1" Steel rod 4 .0254D x .915 51 40 8 D Utility pole 510 .343D x 10.68 55 48 26 E 12" Sch 40 pipe 340 .320 x 4.58 47 28 7 F Automobile 1810 5 x 2 x 1.3 59 52 41 Vertical velocities of 70% of the postulated horizontal velocities are acceptable in both spectra except for the small missile in Spectrum I or missile C above. These missiles, which are used to test barrier openings, should be assumed to have the same velocity in all directions. Missiles A, B, C, and E are to be considered at all elevations and missiles D and F at elevations up to 30 Feet above all grade levels within 1/2 mile of the facility structures. Applicants who were required at the construction permit stage to design to one of the missile spectra (A or B) of the November 24, 1975 version of this SRP section (or a review modification such as a 24" vertical and 21" horizontal wall thickness commitment in Region I), shall have, the option at the OL stage of showing conformance with either their original commitment or Rev. 2 (same | as Rev. 1) to this SRP section. Partial compliance with each'is not acceptable. SRP Section 3.5.1.4, November 24, 1975 MISSILE SPECTRUM A